Free · Debt investment calculators 📉
Debt Cost with an Assumed Tax Shield Calculator
Apply an entered tax-shield rate to a borrowing cost.
- Formula & worked example
- Private in your browser
- No signup
Calculator inputs
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How to use this calculator
- Enter the known values in the units shown. Results update as you type.
- Edit a calculated value to solve backwards, or lock a value to hold it fixed.
- Use the worked example to check the method. Reset restores the starting fields.
Use the result with context
Results are estimates for planning and education. Confirm rates, taxes, fees, and legal requirements with the relevant institution or a qualified professional before making a financial decision.
Formula and method
A borrowing cost of 8% and an assumed tax-shield rate of 25% give a modeled after-tax cost of 6%. This follows 8% × (1 − 25%).
After-tax debt cost = before-tax debt cost × (1 − assumed tax-shield rate)
Worked example
Enter these known values and leave the other values blank.
- Cost of debt
- 8 %
- Assumed tax-shield rate
- 25 %
- After-tax cost of debt
- 6 %
Assumptions and limitations
- No. One minus net income divided by pre-tax income is an effective tax rate. Using it as a debt tax-shield assumption may be inappropriate. Interest deductibility, tax losses and marginal rates require separate assessment.
- Use consistent periods, currency and accounting definitions. The result follows the stated formula and the figures you supply.
Common questions
Is the rate inferred from net income a marginal tax rate?
No. One minus net income divided by pre-tax income is an effective tax rate. Using it as a debt tax-shield assumption may be inappropriate. Interest deductibility, tax losses and marginal rates require separate assessment.
References
The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.
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