Koppers Holdings Inc. (KOP) FY 2023 MD&A
This page reproduces the company's own Item 7 MD&A text from the linked SEC filing. It is filer text, not grepcent analysis, scoring, or investment advice.
ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
Overview
See description of the segments in Item 1 – Business.
Non-GAAP Financial Measures
We utilize certain financial measures that are not in accordance with U.S. generally accepted accounting principles (U.S. GAAP) to analyze and manage the performance of our business. We believe that adjusted EBITDA provides information useful to investors in understanding the underlying operational performance of the company, our business and performance trends, and facilitates comparisons between periods. The exclusion of certain items permits evaluation and a comparison between periods of results for business operations, and it is on this basis that our management internally assesses our performance. Adjusted EBITDA is the primary measure of profitability we use to evaluate our businesses. In addition, adjusted EBITDA is the primary measure used to determine the level of achievement of management's short-term incentive goals and related payout, as well as one of the measures used to determine performance and related payouts for certain performance share units granted to management.
Although we believe that these non-GAAP financial measures enhance investors’ understanding of our business and performance, these non-GAAP financial measures should not be considered an alternative to GAAP financial measures and should be read in conjunction with the relevant GAAP financial measures. Other companies in a similar industry may define or calculate these measures differently than we do, limiting their usefulness as comparative measures. Because of these limitations, these non-GAAP financial measures should not be considered in isolation or as substitutes for performance measures calculated in accordance with GAAP.
Adjusted EBITDA is a non-GAAP financial measure defined as income from continuing operations before interest, income taxes, depreciation, amortization and other adjustments. These other adjustments are items that we believe are not representative of underlying business performance. Adjusted items typically include certain expenses associated with impairment, restructuring and plant closure costs, significant gains and losses on asset disposals or business combinations, LIFO, mark-to-market commodity hedging and other unusual items. The LIFO expense adjustment removes the entire impact of LIFO and effectively reflects the results as if we were on a FIFO inventory basis. An Adjusted EBITDA Reconciliation is presented in the Segment Results section and reconciles net income to adjusted EBITDA on a consolidated basis.
We do not provide reconciliations of guidance for adjusted EBITDA and adjusted EPS to comparable GAAP measures, in reliance on the unreasonable efforts exception. We are unable, without unreasonable efforts, to forecast certain items required to develop meaningful comparable GAAP financial measures. These items include, but are not limited to, restructuring and impairment charges, acquisition-related costs, mark-to-market commodity hedging, and LIFO adjustments that are difficult to forecast for a GAAP estimate and may be significant.
Outlook
We remain committed to expanding and optimizing our business and making continued progress towards our long-term financial goals. After considering global economic conditions, as well as ongoing uncertainty associated with geopolitical and supply chain challenges, the following summarizes our 2024 financial goals:
•
sales of approximately $2.25 billion,
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adjusted EBITDA of approximately $275 million, and
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capital expenditures of approximately $100 million, including capitalized interest, with approximately $29 million of the total allocated to discretionary projects.
Our keys to success for 2024 are the following:
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For our RUPS segment, we need to (i) recoup cost increases, including the value of our creosote preservative in the market, (ii) ensure our facilities run uninterrupted to serve customer demand and (iii) maximize opportunities for increased volumes, including expanding our customer base into the Texas utility pole market.
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For our PC segment, we need to (i) increase market share for certain newer product lines and (ii) improve gross margin by reducing costs.
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For our CMC segment, we need to (i) optimize production from our yield enhancement project at our facility in Nyborg, Denmark, (ii) push acceptance of petroleum-blended products, which mitigates reductions in coal tar volumes and (iii) execute on domestic plant optimization projects.
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Koppers Holdings Inc. 2023 Annual Report
Significant market indicators for our businesses include:
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The Railway Tie Association’s estimate of total crosstie installations in 2024, which is approximately 18.5 million ties, with 14.7 million for Class I railroads. This is consistent with 2023 crosstie installations of approximately 18.4 million crossties with the small increase expected to be from the commercial market.
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According to BMO Capital Markets, market demand for utility poles is expected to remain high throughout 2024 as a result of aging pole infrastructure, efforts to strengthen poles against larger and more frequent storms, a need to add larger poles to support continued electrification and expansion of broadband access.
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The Leading Indicator of Remodeling Activity (LIRA) reported by the Joint Center for Housing Studies of Harvard University, predicts a moderate 6.5 percent decrease in annual homeowner renovation and maintenance expenditures through the fourth quarter of 2024 with annual spending on home improvements and repairs expected to drop from $481 billion to $450 billion over the next four quarters.
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For the external markets served by our CMC business, we anticipate a slowdown in the near-term in manufacturing overall as well as in the steel, aluminum and carbon black industries. The December 2023 S&P Global Mobility forecast saw global light-vehicle sales increasing by 2.8 percent from the prior year and reaching 88.3 million units globally in 2024.
Our businesses and results of operations are affected by various competitive and other factors including (i) the impact of global economic conditions on demand for our products, including the impact of imported products from competitors in certain regions where we operate; (ii) raw material pricing and availability, in particular the cost and availability of hardwood lumber for railroad crossties, softwood lumber for utility poles, scrap copper prices, and the cost and amount of coal tar available in global markets, which is negatively affected by reductions in blast furnace steel production; (iii) volatility in oil prices, which impacts the cost of coal tar and certain other raw materials, as well as selling prices and margins for certain of our products including carbon black feedstock, phthalic anhydride, and naphthalene; (iv) competitive conditions in global carbon pitch markets; and (v) changes in foreign exchange rates. Any or all of these factors could impact our actual results for 2024.
Results of Operations – Comparison of Years Ended December 31, 2023 and December 31, 2022
Consolidated Results
Net sales for the years ended December 31, 2023 and 2022 are summarized by segment in the following table:
| Year Ended December 31, | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | 2022 | Change | % Change | |||||||||||||
| (Dollars in millions) | ||||||||||||||||
| Railroad and Utility Products and Services | $ | 897.9 | $ | 788.3 | $ | 109.6 | 14 | % | ||||||||
| Performance Chemicals | 671.6 | 579.9 | 91.7 | 16 | % | |||||||||||
| Carbon Materials and Chemicals | 584.7 | 612.3 | (27.6 | ) | -5 | % | ||||||||||
| $ | 2,154.2 | $ | 1,980.5 | $ | 173.7 | 9 | % |
RUPS net sales increased largely due to $83.5 million of pricing increases across multiple markets, particularly for crossties and utility poles. Volume increases for Class I crossties and higher activity in our crosstie recovery business also contributed to the increase. These increases were partly offset by lower activity in our other maintenance of way businesses and a 2.5 percent volume decrease in our utility pole businesses. Foreign currency changes compared to the prior year period had an unfavorable impact on sales in the current year period of $2.0 million, mainly from our Australian utility pole business.
PC net sales increased as a result of global price increases of $75.5 million, or 13 percent in the current year period, particularly in the Americas for our copper-based preservatives. Volumes increased by 3.6 percent globally, including a 7.7 percent increase in the Americas, partly offset by volume decreases in Australasia and Europe. Foreign currency changes compared to the prior year period had an unfavorable impact on sales in the current year period of $4.3 million.
CMC net sales decreased due mainly to $27.3 million of volume decreases, primarily phthalic anhydride and carbon pitch, partly offset by volume increases for refined tar. Pricing had a minimal impact on sales for the year as higher prices for carbon pitch in the first half of the year were offset by lower prices for chemical products. Foreign currency changes compared to the prior year period from our international markets had a favorable impact on sales in the current year period of $0.7 million.
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Koppers Holdings Inc. 2023 Annual Report
Cost of sales as a percentage of net sales was 80 percent, compared to 83 percent in the prior year period as global price increases helped offset increased raw material and operating costs incurred in 2022 and 2023 on a consolidated basis and across most of our businesses. Significant items impacting cost of sales in individual operating segments are discussed as part of "Segment adjusted EBITDA and adjusted EBITDA margin" herein.
Gain on sale of assets for 2023 was related to the demolition of our closed coal tar distillation facility located in China, while the prior year gain was related to the sale of our utility pole treating facility in Sweetwater, Tennessee.
Selling, general and administrative expenses were $20.8 million higher when compared to the prior year period due mainly to an increase in compensation related costs along with an increase in bank fees and travel expenses. These increases were partly offset by a reduction in professional services and insurance costs.
Interest expense was $26.2 million higher when compared to the prior year period, due primarily to higher interest rates and an increase in the write-off of debt issuance costs of $1.6 million related to the repayment of the 2025 Notes as described in Note 15 – Debt.
Income tax expense increased by $3.2 million when compared to the prior year period due to higher income from continuing operations before income taxes. This increase was partially offset by a lower effective income tax rate when compared to the prior year period. The lower effective income tax rate is due mainly to the geographical mix of earnings as shown in the effective income tax reconciliation in Note 10 – Income Taxes.
Segment Results
Segment adjusted EBITDA and adjusted EBITDA margin for the years ended December 31, 2023 and 2022 are summarized in the following table:
| Year Ended December 31, | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (Dollars in millions) | 2023 | 2022 | Change | % Change | ||||||||||||
| Adjusted EBITDA: | ||||||||||||||||
| Railroad and Utility Products and Services | $ | 84.0 | $ | 53.6 | $ | 30.4 | 57 | % | ||||||||
| Performance Chemicals | 123.1 | 75.5 | 47.6 | 63 | % | |||||||||||
| Carbon Materials and Chemicals | 49.3 | 99.0 | (49.7 | ) | -50 | % | ||||||||||
| Total Adjusted EBITDA | $ | 256.4 | $ | 228.1 | $ | 28.3 | 12 | % | ||||||||
| Adjusted EBITDA margin as a percentage of GAAP sales: | ||||||||||||||||
| Railroad and Utility Products and Services | 9.4 | % | 6.8 | % | 2.6 | % | 38 | % | ||||||||
| Performance Chemicals | 18.3 | % | 13.0 | % | 5.3 | % | 41 | % | ||||||||
| Carbon Materials and Chemicals | 8.4 | % | 16.2 | % | -7.8 | % | -48 | % |
RUPS adjusted EBITDA increased due primarily to net sales price increases and $19.9 million from improved plant utilization, which combined to more than offset higher raw material, operating and selling, general and administrative expenses of $69.4 million. The domestic utility pole business's increased sales, operating profit and adjusted EBITDA drove the improved results.
PC adjusted EBITDA increased as revised customer pricing enabled us to partly recapture the higher raw material and operating costs that significantly impacted results in 2022, along with a 7.7 percent volume increase in the Americas for wood treatment preservatives. The price increases were partly offset by $46.0 million of higher raw material and selling, general and administrative costs.
CMC adjusted EBITDA decreased due to an increase of $43.6 million in raw material and selling, general and administrative costs, a $2.8 million bad debt reserve and volume decreases, partly offset by lower operating costs in North America compared to the prior year period as well as $2.3 million of insurance proceeds recognized in the current year period. Foreign currency changes from our international markets had an unfavorable impact on profitability in the current year period of $1.2 million. CMC’s near-term profitability may be negatively affected by customers associated with bad debt reserve activity, but this is not expected to have a material effect on the Company’s overall profitability in 2024.
See Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations included in our Annual Report on Form 10-K for the year ended December 31, 2022, which is incorporated herein by reference, for discussion and analysis of consolidated results of operations and cash flows for the year ended December 31, 2021.
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Koppers Holdings Inc. 2023 Annual Report
Adjusted EBITDA Reconciliation. The following table reconciles net income, the most directly comparable financial measure determined and reported in accordance with U.S. GAAP, to adjusted EBITDA on a consolidated basis:
| Year Ended December 31, | ||||||||
|---|---|---|---|---|---|---|---|---|
| (Dollars in millions) | 2023 | 2022 | ||||||
| Net income | $ | 89.8 | $ | 63.2 | ||||
| Interest expense | 71.0 | 44.8 | ||||||
| Depreciation and amortization | 57.0 | 56.1 | ||||||
| Income taxes | 34.8 | 31.6 | ||||||
| Discontinued operations | 0.0 | 0.6 | ||||||
| Sub-total | 252.6 | 196.3 | ||||||
| Adjustments to arrive at adjusted EBITDA: | ||||||||
| LIFO expense(1) | 6.0 | 25.6 | ||||||
| Impairment, restructuring and plant closure costs | 0.1 | 1.1 | ||||||
| (Gain) on sale of assets | (1.8 | ) | (2.5 | ) | ||||
| Mark-to-market commodity hedging (gains) losses | (0.5 | ) | 6.5 | |||||
| Inventory adjustment | 0.0 | 1.1 | ||||||
| Total adjustments | 3.8 | 31.8 | ||||||
| Adjusted EBITDA | $ | 256.4 | $ | 228.1 |
(1)
The LIFO expense adjustment removes the entire impact of LIFO and effectively reflects the results as if we were on a FIFO inventory basis.
Cash Flow
Net cash provided by operating activities for the year ended December 31, 2023 was $146.1 million compared to $102.3 million in the prior year. The increase was primarily the result of higher net sales and improved collection of accounts receivable, partly offset by higher costs and an increase in inventory consistent with restocking crosstie inventory in our RUPS segment.
Net cash used in investing activities for the year ended December 31, 2023 was $116.0 million compared to $114.8 million in the prior year driven primarily by capital expenditures. Capital expenditures for both periods include increased investment in growth projects, such as the expansion of our RUPS facility in North Little Rock, Arkansas and a yield enhancement project at our CMC facility in Nyborg, Denmark.
Net cash provided by financing activities for the year ended December 31, 2023 was $2.6 million compared to $4.8 million in the prior year. The sources of financing cash flows were net borrowings of $23.1 million and $9.9 million from issuances of common stock, primarily due to the exercise of stock options. This was offset by repurchases of common stock, payments of debt issuance costs and dividends paid. In the prior year, the primary source of financing cash flows was net borrowings of $36.3 million and the primary uses of financing cash flows were repurchases of common stock, payments of debt issuance costs and dividends paid.
Liquidity and Capital Resources
Our Credit Facility is described in Note 15 – Debt.
Restrictions on Dividends to Koppers Holdings
Koppers Holdings depends on the dividends from the earnings of Koppers Inc. and its subsidiaries to generate the funds necessary to meet its financial obligations, including the payment of any declared dividend of Koppers Holdings. The Credit Facility permits Koppers Inc. to make dividend payments to Koppers Holdings if certain conditions are met, including, among other permitted dividend payments, the ability to fund the payment of regularly scheduled dividends on and repurchases of Koppers Holdings common stock, in an aggregate amount per fiscal year not to exceed the greater of $50.0 million, with unused amounts in any fiscal year being carried over to the succeeding fiscal year, and 6.0 percent of market capitalization.
Liquidity
As of December 31, 2023, the maximum amount available under the Credit Facility considering restrictions from debt covenants was approximately $386 million. The maximum amount available under the Credit Facility is increased by the amount of cash held by certain subsidiaries under the terms of the Credit Facility.
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Koppers Holdings Inc. 2023 Annual Report
Our need for cash in the next twelve months relates primarily to contractual obligations which includes debt service, pension plan funding, purchase commitments and operating leases, as well as working capital, capital spending, dividends and share repurchases. We may also use cash to pursue other potential strategic acquisitions or voluntary pension plan contributions, including pension plan settlements. Capital expenditures in 2024, excluding acquisitions, if any, are expected to total approximately $100 million and are expected to be funded by cash from operations. We anticipate that our liquidity will continue to be adequate to fund our cash requirements for at least the next twelve months.
We manage our working capital to increase our flexibility to pay down debt. The amount of our outstanding debt and our overall cash flows will fluctuate throughout any operating period based upon, among other things, the timing of receipts from customers and payments to vendors. As of December 31, 2023, approximately 85 percent of accounts payable was current and 15 percent was 1-30 days past due. As of December 31, 2022, approximately 80 percent of accounts payable was current and 20 percent was 1-30 days past due.
Purchase Commitments and Contractual Obligations
Purchase commitments consist primarily of raw materials purchase contracts. These are typically not fixed price arrangements; the prices are based on prevailing market prices. As a result, we generally expect to be able to hedge the purchases with sales at those future prices.
| Payments Due by Period | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2024 | 2025-2026 | 2027-2028 | Thereafter | Total | |||||||||||||||
| (Dollars in millions) | |||||||||||||||||||
| Purchase commitments | $ | 257.3 | $ | 308.4 | $ | 118.9 | $ | 0.3 | $ | 684.9 |
Contractual obligations are primarily related to our debt agreements and operating leases. See Note 15 – Debt for discussion of the contractual obligations under our debt agreements, including interest payments and the timing of principal repayments. See Note 16 – Leases for discussion of our operating lease obligations.
Pension and other employee benefit plan funding contributions (for defined benefit plans) are expected to total approximately $7.6 million in 2024, for normal plan operations. Estimated funding obligations are determined by asset performance, workforce and retiree demographics, tax and employment laws and other actuarial assumptions, which may change the annual funding obligations in addition to decisions to fund in excess of statutorily required amounts. In addition, we are evaluating the termination of our US qualified pension plan, which would be targeted for completion by late 2024. If we proceed with the termination, the additional funding requirement is estimated to be approximately $25 million. The funded status of our defined benefit plans is disclosed in Note 14 – Pensions and Post-Retirement Benefit Plans.
Federal tax payments related to the transition tax in accordance with the Tax Cuts and Jobs Act of 2017 (the Tax Act) are expected to be $1.5 million in the next two years. As of December 31, 2023, there was $1.5 million of tax liabilities related to unrecognized tax benefits. Because of the high degree of uncertainty regarding the timing of future cash outflows associated with these liabilities, we are unable to estimate the years in which settlement will occur with the respective taxing authorities. Additional information regarding taxes is disclosed in Note 10 – Income Taxes.
Bank Debt Covenants at December 31, 2023
The bank debt covenants that affect availability of the Credit Facility and which may restrict the ability of Koppers Inc. to pay dividends include the following financial ratios:
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The total net leverage ratio is calculated as of the last day of each fiscal quarter in accordance with the Credit Facility definitions of consolidated total net debt divided by consolidated EBITDA and is not permitted to exceed 5.0. The total net leverage ratio as of December 31, 2023 was 2.9. Effective during the first quarter of 2024, the total net leverage ratio is not permitted to exceed 4.75.
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The cash interest coverage ratio, calculated as of the last day of each fiscal quarter, is not permitted to be less than 2.0. The cash interest coverage ratio as of December 31, 2023 was 3.9.
We are currently in compliance with all covenants governing the Credit Facility. Our continued ability to meet these financial covenants can be affected by events beyond our control.
Other Matters
Foreign Operations and Foreign Currency Transactions
We are subject to foreign currency translation fluctuations due to our foreign operations. See the Consolidated Statement of Comprehensive Income for the impact that exchange rate fluctuations had on comprehensive income. Foreign currency transaction gains and losses result from transactions denominated in a currency that is different from the currency used by the entity to prepare its financial statements. Foreign currency transaction gains (losses) were $1.0 million, $(0.8) million and $(0.7) million for the years ended December 31, 2023, 2022 and 2021, respectively.
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Koppers Holdings Inc. 2023 Annual Report
Recently Issued Accounting Guidance
Information regarding recently issued accounting guidance is contained in Note 2 – Summary of Significant Accounting Policies.
Critical Accounting Policies
The preparation of financial statements in conformity with generally accepted accounting principles in the United States requires management to use judgment in making estimates and assumptions that affect the reported amounts of revenues and expenses, assets and liabilities, and the disclosure of contingent liabilities. The following accounting policies are based on, among other things, judgments and assumptions made by management that include inherent risks and uncertainties. Our management’s estimates are based on the relevant information available at the end of each period. With the exception of the revenue recognition policy, each of the following policies contain critical accounting estimates.
Revenue Recognition. Revenue is recognized upon the completion of performance obligations under our contracts with customers and when control of a good or service is transferred to the customer. See Note 2 – Summary of Significant Accounting Policies for our revenue recognition policy.
Goodwill and Intangible Assets. Goodwill is assessed for impairment annually, using a quantitative goodwill impairment test, or more frequently if a change in circumstances or the occurrence of events indicates the carrying value may not be recoverable. We annually evaluate the remaining useful life of the intangible asset being amortized to determine whether events or circumstances warrant a revision to the remaining period of amortization. See Note 13 – Goodwill and Intangible Assets for our goodwill and intangible assets accounting policy.
We utilize the work of third-party specialists to assist in the fair value estimates. The key assumptions for the market and income approaches we use to determine fair value of our reporting units are updated at least annually. Those key assumptions include discount rates (13.5 percent – 17.5 percent), market multiples (4.5 – 7.5 times adjusted EBITDA) and terminal growth rates (5.4 – 6.5 times adjusted EBITDA) as well as future forecasts of revenue growth and adjusted EBITDA, which are based on our strategic plan. The strategic plan is updated as part of the annual planning process and is reviewed and approved by management and the Board of Directors. The strategic plan may be revised as necessary during the fiscal year based on changes in operating or economic conditions. The actual fair value may vary from our estimate under the market approach for many reasons, including because the peer group valuation differs from how investors value our business, valuation multiples change as a result of market conditions, changes in our business assumptions and other factors. Discount rates may be impacted by adverse changes in macroeconomic environment, volatility in the equity and debt markets or other factors. Our key assumptions are materially consistent with prior year.
During the fourth quarter of 2023, we performed an impairment test for goodwill for each of our reporting units using the quantitative approach. We determined the fair value of each of the reporting units exceeded its respective carrying amount; therefore, we determined that goodwill was not impaired at any of our reporting units as of December 31, 2023. The estimated fair value, as calculated at October 31, 2023, for the three reporting units ranged from approximately eight percent to 110 percent greater than their carrying value (six percent to 84 percent at the previous impairment assessment date). Our Railroad Products and Services reporting unit is at the low-end of that range and could experience impairment in the future if we do not achieve our profitability projections, there is a change in key assumptions underlying the valuation or if we experience a substantial decrease in our stock price.
While we can implement certain strategies to address changes in economic and operating conditions, adverse changes in the future could reduce the future revenue and cash flows used to estimate reporting unit fair values, which could trigger a future impairment charge. Additionally, disruptions to our business such as prolonged recessionary periods or unexpected significant declines in operating results of the relevant reporting units could result in charges for goodwill and other asset impairments in future periods. An estimate of the sensitivity to changes in our assumptions is not practicable given the numerous assumptions that can materially affect our estimates.
Deferred Tax Assets. See Note 10 – Income Taxes for information on deferred tax activity. Our deferred tax assets and liabilities are predominantly related to our domestic entities. In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will be realized. In evaluating the need for a valuation allowance, management considers various factors, including the expected level of future taxable income, available tax planning strategies and reversals of existing taxable temporary differences, all of which are subject to change based on business conditions and changes in tax law and regulations.
The realization of a majority of our deferred tax assets is not subject to any expiration and is dependent upon the reversal of the underlying temporary differences. To the extent future taxable income projections are not achieved, we could be required to record a valuation allowance against certain deferred tax assets, which would result in additional income tax expense.
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Koppers Holdings Inc. 2023 Annual Report
Asset Retirement Obligations. We measure asset retirement obligations using certain assumptions including estimates regarding the recovery of residues in storage tanks, which can vary from actual residues recovered on retirement. In the event that the amount of residue, the effort required to remove the residue or regulatory requirements vary from our estimates, we could incur additional significant charges to income and increases in cash expenditures related to the disposal of those residues. Certain conditional asset retirement obligations related to facilities have not been recorded in the consolidated financial statements due to uncertainties surrounding the ultimate settlement date and estimate of fair value related to a legal obligation to perform an asset retirement activity. At the date a reasonable estimate of the ultimate settlement amount and timing can be made, we will record an asset retirement obligation, and such amounts may be material to the consolidated financial statements in the period in which they are recorded. See Note 2 – Summary of Significant Accounting Policies for information on expense recognized during the past two years. An estimate of the sensitivity to changes in our assumptions is not practicable given the numerous assumptions that can materially affect our estimates.
Pension and Post-retirement Benefits. Accounting for pension and other post-retirement benefit obligations involves numerous assumptions, the most significant of which relate to the following:
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the discount rate for measuring the present value of future plan obligations; and
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the expected long-term return on plan assets.
We develop our demographics and utilize the work of third-party actuaries to assist in the measurement of these obligations. We have selected different discount rates for our pension plans and our other post-retirement benefit plans due to the different projected benefit payment patterns. In determining the assumed discount rates at December 31, 2023, we used our third-party actuary’s discount rate model. This model calculates an equivalent single discount rate for the projected benefit plan cash flows using a hypothetical bond portfolio to match expected cash flows under our benefit plans. The bonds used are rated AA or higher by a recognized rating agency, and only non-callable bonds are included with the exception of those with a make-whole call feature. The actuary limited the selection to those bonds with a minimum of 100,000 outstanding issues. Outlier bonds whose yields exceeded two standard deviations from the yield curve derived from similar quality bonds were excluded.
Of the assumptions used to measure the year-end obligations and estimated annual net periodic benefit cost, the discount rate has the most significant effect on the periodic benefit cost reported for the plans. Decreasing the discount rates by 0.25 percent for our pension plans and 0.25 percent for our other post-retirement benefit plans would increase pension obligations and other post-retirement benefit plan obligations by $3.9 million. Increasing the discount rates by the same amount would not have a material effect on defined benefit pension expense and other post-retirement benefit plan expense.
The asset rate of return assumption considers the asset mix of the plans (currently targeted at 100 percent fixed income securities and cash equivalents for the funded U.S. pension plan), past performance and other factors, including expected re-allocations of asset mix occurring within a reasonable period of time. Our asset rate of return assumption is 5.62 percent for 2023 defined benefit pension expense. Decreasing the asset rate of return assumption by 0.25 percent would increase our defined benefit pension expense by $0.3 million.
See Note 14 – Pensions and Post-Retirement Benefit Plans for detailed information about the assumptions used to calculate the components of our annual defined benefit pension and other post-retirement plan expense, as well as the obligations and accumulated other comprehensive loss reported on the year-end balance sheets.
Environmental Liabilities. As discussed under Environmental Matters in Item 1 – Business, we are subject to federal, state, local, and foreign laws and regulations, and potential liabilities relating to the protection of the environment and human health and safety. We expect to incur substantial costs for ongoing compliance with such laws and regulations. We may also incur costs as a result of governmental or third-party claims, or other requirements, relating to cleanup of, or for injuries resulting from, contamination at sites associated with past and present operations. We accrue for environmental liabilities when a determination can be made that they are probable and reasonably estimable. The amount accrued is determined through the evaluation of various information, which could include claims, settlement offers, demands by government agencies, estimates performed by independent third parties, identification of other responsible parties and an assessment of their ability to contribute, and our prior experience. Inherent uncertainties exist in such estimates primarily due to unknown conditions and other circumstances, changing governmental regulations and legal standards regarding liability, and evolving technologies. See Note 17 – Commitments and Contingent Liabilities for information about environmental liabilities.
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Koppers Holdings Inc. 2023 Annual Report