Company: OC
Filing Date: 2025-02-24
Form Type: 10-K
Source: 0001370946-25-000077
Chunk: 161

Company: Owens Corning
Filing Date: 2025-02-24
Form: 10-K
Item: Item 1
Chunk 161
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 and other postretirement benefits involves estimating the cost of benefits to be provided well into the future and attributing that cost over the time period each employee works. To accomplish this, extensive use is made of assumptions about investment returns, discount rates, inflation, mortality, turnover and medical costs. Changes in assumptions used could result in a material impact to our Consolidated Financial Statements in any given period.

Two key assumptions that could have a significant impact on the measurement of pension liabilities and pension expense are the discount rate and the expected return on plan assets. For our largest plan, the United States plan, the discount rate used for the December 31, 2024 measurement date is based on a yield curve approach where the expected future benefit payments are matched with a yield curve derived from certain AA-rated corporate bonds.

The result supported a discount rate of 5.65% at December 31, 2024 compared to 5.00% at December 31, 2023. A 25 basis point increase (decrease) in the discount rate would (decrease) increase the December 31, 2024 projected benefit obligation for the United States pension plan by approximately $8 million. A 25 basis point increase (decrease) in the discount rate would (decrease) increase 2025 net periodic pension cost by less than $1 million.

The expected return on plan assets in the United States was derived by taking into consideration the target plan asset allocation, historical rates of return on those assets, projected future asset class returns and net out performance of the market by active investment managers and plan related and investment related expenses paid from the plan trust. The Company uses the target plan asset allocation because we rebalance our portfolio to target on at least a quarterly basis. An asset return model was used to develop an expected range of returns on plan investments over a 20-year period, with the expected rate of return selected from a best estimate range within the total range of projected results. This process resulted in the selection of an expected return of 6.00% at the December 31, 2024 measurement date, which is used to determine net periodic pension cost for the year 2025. The expected return selected at the December 31, 2023 measurement date was 5.75%, which was used to determine the net periodic pension cost for the year 2024. A 25 basis point decrease in return on plan assets assumption would result in a respective increase of 2025 net periodic pension cost by less than $