Mortgage Interest Deduction Calculator
Estimate potential tax savings from deductible mortgage interest and a marginal tax rate.
- Last reviewed
- July 8, 2026
- Cost
- Free to use
- Data
- Runs in your browser
Deductible Interest
Enter valid inputs
Estimated Tax Savings
Enter valid inputs
After-Tax Interest Cost
Enter valid inputs
Methodology
How this calculator handles inputs
This calculator uses the values you enter above and applies the formula explained in the guide below. Results update in the browser and are intended for quick planning, comparison, and sanity-checking.
- Use consistent periods, currencies, and units across inputs.
- Review any assumptions before using the result in a decision.
- Recalculate when rates, prices, tax rules, or business terms change.
Important note
This tool provides general planning information only. It is not tax, legal, financial, accounting, or investment advice. Check the current rules for your location and speak with a qualified professional before making a high-stakes decision.
Guide
How it works
Use this calculator to estimate potential mortgage interest deduction savings.
What this calculator does
The mortgage interest deduction calculator estimates deductible interest, tax savings, and after-tax interest cost.
Mortgage Interest Deduction Formula
Estimated Tax Savings = Deductible Interest x Marginal Tax Rate
Example calculation
If deductible mortgage interest is 18,000 and your marginal tax rate is 24%, estimated tax savings are 4,320.
When to use this calculator
- estimating tax impact of mortgage interest
- comparing after-tax borrowing costs
- planning itemized deductions
- reviewing annual mortgage interest paid
FAQs
Is this tax advice?
No. Tax rules vary, and deduction eligibility depends on your situation.
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