Who is eligible to deduct mortgage interest on their taxes for the 2026 tax year?

To be eligible, you must itemize deductions on Schedule A (Form 1040) instead of taking the standard deduction. The mortgage must be on your main home or a second home, and the loan must be secured by that home.

What is the maximum mortgage amount for which I can deduct interest in 2026?

For mortgages originated on or before December 15, 2017, you can deduct interest on up to $1 million ($500,000 if married filing separately) of acquisition debt. For mortgages originated after December 15, 2017, this limit is reduced to $750,000 ($375,000 if married filing separately).

What documentation do I need to claim the mortgage interest deduction?

You will typically receive Form 1098, Mortgage Interest Statement, from your lender by January 31st of the following year. This form reports the total interest you paid during the tax year, which you will use to complete Schedule A.

Does my filing status affect my mortgage interest deduction limit?

Yes, your filing status significantly impacts the deduction limits. For example, the $750,000 acquisition debt limit for post-2017 mortgages is reduced to $375,000 for those married filing separately.

What if my mortgage balance exceeds the IRS deduction limit?

If your mortgage balance exceeds the applicable limit ($750,000 or $1 million), you can only deduct a prorated portion of the interest paid. The deductible amount is calculated based on the ratio of the deductible loan amount to the total average loan balance.

Can I deduct mortgage interest if I refinanced my home?

If you refinanced, the interest on the new loan is generally deductible up to the amount of the original mortgage balance used to acquire or improve the home. Any additional amount borrowed beyond the original principal is not considered acquisition debt for deduction purposes unless used for home improvements.

Are mortgage points deductible in 2026?

Yes, points paid to obtain a mortgage can be deductible. Generally, points for your main home mortgage are fully deductible in the year they are paid, while points for a second home or a refinance must be amortized over the life of the loan.

How does the standard deduction affect my ability to claim the mortgage interest deduction?

You can only claim the mortgage interest deduction if your total itemized deductions (including mortgage interest, state and local taxes, charitable contributions, etc.) exceed your standard deduction amount. If your standard deduction is higher, it is usually more beneficial to take the standard deduction.

verified 2026 Regulatory Precision Standard • Verified Model

Mortgage Interest Deduction Calculator

Calculate your eligible mortgage interest deduction for the 2026 tax year. Determine your potential tax savings with our easy-to-use tool.

tune Calculation Parameters

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Average Mortgage Balance for the Year Enter the average outstanding balance of your mortgage(s) for the tax year. This includes both acquisition debt and home equity debt.

Total Mortgage Interest Paid Enter the total amount of mortgage interest you paid during the tax year, as reported on Form 1098.

Mortgage Origination Date Select the date your mortgage was originated. This affects deduction limits.

Tax Filing Status Your tax filing status for the current tax year.

Are you itemizing deductions? You can only deduct mortgage interest if you itemize deductions on Schedule A (Form 1040).

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Deductible Mortgage Interest

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Calculations adhere strictly to 2026 federal standards and published statutory parameters.

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Comprehensive Calculation Guide & Methodology

In-depth mathematical breakdowns, statutory formulas, and real-world scenarios.

Understanding Your Mortgage Interest Deduction

Navigating the complexities of tax deductions can be challenging, especially when it comes to significant expenses like mortgage interest. The Mortgage Interest Deduction allows U.S. homeowners to estimate the amount of home mortgage interest they can deduct on their federal income tax return. This methodology provides clarity on how current IRS rules, particularly those stemming from the Tax Cuts and Jobs Act (TCJA), affect your potential itemized deduction.

The mortgage interest deduction allows homeowners who itemize their deductions to reduce their taxable income by the amount of interest paid on certain home loans. However, the rules for this deduction have changed over time, most notably with the Tax Cuts and Jobs Act (TCJA) of 2017.

For mortgages originated on or before December 15, 2017, you can deduct interest on up to $1 million ($500,000 if married filing separately) of home acquisition debt. This includes debt used to buy, build, or substantially improve your main home or a second home.

For mortgages originated after December 15, 2017, the deduction limit is reduced to interest on up to $750,000 ($375,000 if married filing separately) of home acquisition debt. Under current law, interest on home equity loans or lines of credit (HELOCs) is only deductible if the funds were used to buy, build, or substantially improve the home securing the loan.

Our calculator takes these critical dates and limits into account to help you determine your eligible deduction for the 2026 tax year.

Example Mortgage Interest Deduction Scenarios

To illustrate how the deduction works, let’s look at a few common scenarios. These examples demonstrate how different mortgage amounts, origination dates, and filing statuses can impact your deductible interest.

Scenario	Average Mortgage Balance	Total Interest Paid	Origination Date	Filing Status	Itemizing Deductions	Deductible Interest	Deduction Limit Applied	Explanation
Standard (Post-TCJA)	$350,000	$14,000	2026-05-20	Married Filing Jointly	Yes	$14,000	$750,000	N/A
Mortgage Over Limit (Post-TCJA)	$800,000	$32,000	2015-08-01	Married Filing Jointly	Yes	$32,000	$1,000,000	N/A
Pre-TCJA Mortgage (Higher Limit)	$950,000	$38,000	2026-01-10	Single	Yes	$29,999.99	$750,000	N/A
Not Itemizing Deductions	$450,000	$18,000	2026-03-01	Single	No	$0	$0	N/A

How the Mortgage Interest Deduction is Calculated

The calculation of your deductible mortgage interest involves several steps, primarily focusing on the principal amount of your mortgage and its origination date.

Determine the Applicable Debt Limit:
- If your mortgage was originated on or before December 15, 2017, the limit for acquisition debt is $1,000,000 ($500,000 if married filing separately).
- If your mortgage was originated after December 15, 2017, the limit for acquisition debt is $750,000 ($375,000 if married filing separately).
Calculate the Prorated Deductible Interest (if applicable): If your average mortgage balance for the year exceeds the applicable debt limit, you cannot deduct all the interest you paid. Instead, you must prorate the interest. The formula for prorated interest is:

FORMULADeductible Interest = Total Interest Paid × ( (Applicable Debt Limit ÷ Average Mortgage Balance) )

If your average mortgage balance is less than or equal to the applicable debt limit, your deductible interest is simply the total mortgage interest you paid, provided you itemize deductions.

3. Check Itemization: You can only claim the mortgage interest deduction if you choose to itemize your deductions on Schedule A (Form 1040) instead of taking the standard deduction. If you do not itemize, your deductible interest is $0.

Important Note: The calculator assumes your mortgage is “acquisition debt,” meaning it was used to buy, build, or substantially improve your main home or a second home. Interest on home equity loans or lines of credit used for other purposes (e.g., paying off credit card debt) is generally not deductible under current law.

Official Sources and References

For the most accurate and up-to-date information regarding the home mortgage interest deduction, please refer to the official publications from the Internal Revenue Service (IRS):

These resources provide comprehensive details on eligibility, limitations, and how to report your deduction.

Important Notes and Tips

Itemizing is Key: You must itemize deductions on Schedule A (Form 1040) to claim the mortgage interest deduction. For many taxpayers, the standard deduction is higher than their itemized deductions, making the mortgage interest deduction irrelevant in those cases.
Form 1098: Your mortgage lender will send you Form 1098, “Mortgage Interest Statement,” by January 31st each year, reporting the total interest you paid during the previous year. This is the amount you should use for the “Total Mortgage Interest Paid” input.
Acquisition Debt vs. Home Equity Debt: Be mindful of the distinction. Interest on home equity debt is only deductible if the loan was used to buy, build, or substantially improve the home.
Second Homes: You can deduct mortgage interest on a second home, but the same debt limits apply to the combined total of your main home and second home mortgages.
Tax Law Changes: Tax laws can change. Always consult the latest IRS publications or a qualified tax professional for the most current guidance.

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Frequently Asked Questions

Regulatory Disclosure (2026): Tax calculations are estimates based on IRS Publication 15-T and applicable federal tax brackets. This tool does not constitute official tax advice, CPA certified counsel, or legal representation. For individualized tax filing guidance, consult a licensed tax professional or visit IRS.gov.