How is the tax discount rate calculated?

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How is the tax discount rate calculated?

The tax discount rate is built from a tax-specific, stable benchmark rather than market or current-year rates. It uses the federal mid-term rates published by the IRS, but instead of taking the latest number, it takes a 60-month moving average ending on December 1 of the prior year. This smooths out short-term swings and gives a more predictable rate for discounting future tax cash flows. The rate is vintaged, meaning the rate used is tied to each projection year’s bucket rather than applying a single rate to all future years. This combination—a 60-month average of the IRS mid-term rates, ended prior year, with vintaging—captures the appropriate tax-time horizon and provides stability for present-value calculations. Using a moving average of mid-term rates aligns with the tax-discounting concept because those rates are designed for tax-related discounting, while using current-year tax rates would be too volatile, and relying on prime rates or long-term government yields would not reflect the standard tax-discounting framework practitioners use.

The tax discount rate is built from a tax-specific, stable benchmark rather than market or current-year rates. It uses the federal mid-term rates published by the IRS, but instead of taking the latest number, it takes a 60-month moving average ending on December 1 of the prior year. This smooths out short-term swings and gives a more predictable rate for discounting future tax cash flows. The rate is vintaged, meaning the rate used is tied to each projection year’s bucket rather than applying a single rate to all future years. This combination—a 60-month average of the IRS mid-term rates, ended prior year, with vintaging—captures the appropriate tax-time horizon and provides stability for present-value calculations.

Using a moving average of mid-term rates aligns with the tax-discounting concept because those rates are designed for tax-related discounting, while using current-year tax rates would be too volatile, and relying on prime rates or long-term government yields would not reflect the standard tax-discounting framework practitioners use.

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