See How Much Your Mortgage Interest Could Save on Federal Taxes
Paying $20,000 in mortgage interest does not necessarily mean you save $20,000 in taxes—or even 22% of that amount. The actual federal tax benefit depends on your eligible loan debt, filing status, taxable income and whether itemizing beats the standard deduction.
Use this calculator to estimate deductible mortgage interest, qualifying points, mortgage insurance premiums, property taxes and the potential tax savings from claiming mortgage-related itemized deductions in 2026.
2026 Mortgage Interest Deduction Calculator
Enter annual amounts for tax year 2026. The example values are prefilled. Use Form 1098 or your lender’s interest statement when possible.
Important calculation assumptions
The tool assumes a qualified, secured personal-residence acquisition mortgage and a single debt category. It applies a simplified proportional interest limitation using your entered average qualified debt balance.
It models the 2026 SALT limit with AGI as an approximation of relevant modified AGI, the PMI income phaseout, and the general top-bracket itemized deduction reduction. It does not model alternative minimum tax, special credits, capital gains rates, all lender/refinance exceptions or multiple mortgages with different debt categories.
This estimate is for personal federal Schedule A deductions. Rental-property and business mortgage interest generally follow separate tax rules and are not calculated here.
Is Mortgage Interest Tax Deductible in 2026?
Yes, eligible home mortgage interest can be deductible on your federal return if you itemize deductions on Schedule A and meet the IRS requirements. The mortgage generally must be secured by your qualified main home or second home, and qualifying loan proceeds must be used to buy, build or substantially improve the home securing the loan.
For most newer mortgages, the acquisition debt limit is $750,000, or $375,000 if married filing separately. Qualifying older mortgages can retain a $1 million limit, or $500,000 for married filing separately.
Newer qualifying mortgages
General combined acquisition-debt limit for qualifying debt incurred after December 15, 2017.
Eligible older mortgages
Higher limit generally applies to qualifying acquisition debt incurred before December 16, 2017.
Claiming the deduction
Interest is generally claimed as an itemized deduction, not a direct tax credit or reduction of mortgage principal.
What can count toward the deduction?
- Qualifying mortgage interest paid during 2026.
- Eligible points deducted in the year paid or allocated from prior payments.
- Eligible mortgage insurance premiums under the 2026 reinstated rules.
- Interest on qualifying home equity debt used to buy, build or substantially improve the securing home, within the combined debt limit.
These items have distinct requirements. A lender reporting a payment on Form 1098 does not automatically make the entire amount deductible.
2026 Mortgage Interest Deduction Limits by Loan Date
| Mortgage debt category | Most filing statuses | Married filing separately |
|---|---|---|
| Qualifying debt incurred after December 15, 2017 | $750,000 | $375,000 |
| Qualifying debt incurred October 14, 1987–December 15, 2017 | $1,000,000 | $500,000 |
| Qualifying debt incurred on or before October 13, 1987 | Special grandfathered debt rules | Special grandfathered debt rules |
| Multiple loans with mixed dates | Combined limits and allocation rules | Combined limits and allocation rules |
Does this mean you can deduct $750,000?
No. The $750,000 amount generally limits eligible mortgage debt, not the annual dollar deduction itself. The deduction relates to qualifying interest actually paid on the eligible debt.
What if your mortgage exceeds $750,000?
Only the eligible portion of interest may be deductible under the applicable limit. For a straightforward single mortgage, a simplified estimate can use the qualified average acquisition-debt balance to calculate the fraction of the year’s interest potentially allowed.
For example, if a newer qualifying mortgage has an average eligible balance of $900,000, the debt limitation may restrict the interest to approximately $750,000 ÷ $900,000, or 83.33%, under the simple single-loan assumption. The exact IRS calculation can differ where loan balances, loan uses or multiple debts require additional worksheets.
Example: How Much Tax Does $20,000 of Mortgage Interest Save?
Consider a single taxpayer in 2026 with $120,000 in adjusted gross income, $20,000 of fully deductible mortgage interest, $10,500 of eligible SALT payments and $2,500 in qualifying charitable cash gifts.
For 2026, the taxpayer’s itemized charitable deduction in this simplified example is reduced by the new 0.5% AGI floor, or $600. The charitable deduction available while itemizing is therefore $1,900.
| Item | Estimated amount |
|---|---|
| Adjusted gross income | $120,000 |
| 2026 basic standard deduction (single) | $16,100 |
| Allowable mortgage interest | $20,000 |
| Eligible SALT deduction | $10,500 |
| Charitable cash gifts after 0.5% AGI floor | $1,900 |
| Total itemized deductions with mortgage | $32,400 |
The taxpayer would normally choose the itemized deduction in this example because it exceeds the basic standard deduction. However, the 2026 rules also permit a limited qualified cash charitable contribution deduction for eligible non-itemizers, up to $1,000 for single filers in qualifying circumstances.
Comparing federal tax under both alternatives is therefore more informative than simply multiplying $20,000 of interest by a marginal tax rate. The calculator applies the relevant 2026 ordinary federal brackets and compares both scenarios.
Can $10,000 of mortgage interest produce no extra tax savings?
Yes. If allowable itemized deductions remain below the amount you could deduct using the standard deduction and any applicable non-itemizer adjustment, mortgage interest may not reduce your federal income tax further.
Mortgage Interest Deduction vs. Standard Deduction in 2026
Claiming mortgage interest requires itemizing deductions. The best choice usually depends on which permitted method reduces your actual federal income tax more.
Single or married separately
2026 basic standard deduction, before any qualifying additional amount for age or blindness.
Married filing jointly
2026 basic standard deduction for eligible joint filers.
Head of household
2026 basic standard deduction for qualifying head-of-household filers.
What counts toward itemized deductions?
- Allowable home mortgage interest and qualifying points.
- Qualified mortgage insurance premiums where eligible.
- State and local income or general sales taxes, eligible real estate taxes and other qualifying taxes, subject to SALT limitations.
- Qualified charitable contributions after the applicable 2026 itemizer rules.
- Eligible medical expenses exceeding the applicable 7.5%-of-AGI floor.
- Other specifically permitted Schedule A deductions.
Additional standard deduction for older or blind taxpayers
For 2026, an additional standard deduction of $1,650 generally applies per qualifying age/blindness condition for married taxpayers, or $2,050 for eligible unmarried filers. The calculator lets you enter this amount manually because filing and eligibility details matter.
2026 charitable donations have a new comparison rule
Beginning in 2026, itemizers generally deduct only qualifying charitable contributions above 0.5% of AGI, subject to other charitable limitations. Eligible taxpayers using the standard deduction may separately deduct qualifying cash gifts up to $1,000, or $2,000 for joint filers.
Can You Deduct PMI, FHA Mortgage Insurance and Loan Points in 2026?
Mortgage insurance premiums are deductible again in 2026
Beginning with tax year 2026, qualifying mortgage insurance premiums paid under eligible contracts issued after December 31, 2006, in connection with acquisition debt on a qualified main or second home can again be treated as home mortgage interest.
The deduction remains subject to relevant eligibility conditions and income-based reductions. Under the phaseout framework, qualified premiums are reduced by 10% for each $1,000 (or fraction) of AGI above $100,000, with a $500 step and $50,000 starting point for married filing separately.
| 2026 AGI example | Single/MFJ/HOH illustrative eligible PMI share |
|---|---|
| $100,000 or less | 100% before other limitations |
| $101,000 | 90% |
| $105,000 | 50% |
| $109,000 | 10% |
| Above $109,000 | 0% under the phaseout calculation |
The table illustrates the AGI phaseout only, before any loan-related or other applicable limitations. The married-filing-separately thresholds differ.
Are mortgage points deductible?
Qualifying points paid to obtain a loan for a principal residence may be deductible in the year paid when the IRS requirements are satisfied. In other situations, including many refinancings, points generally must be allocated over the loan term.
For a 30-year refinancing loan requiring amortization, for example, you would generally divide eligible points across the scheduled monthly payments instead of deducting the entire amount immediately.
See IRS Tax Topic 504: Home Mortgage Points and Publication 936.
2026 Property Tax and SALT Deduction Rules for Homeowners
Mortgage interest often becomes useful for itemizing when combined with eligible state and local taxes, particularly property taxes. For 2026, the general SALT deduction cap is $40,400, or $20,200 if married filing separately.
For higher-income taxpayers, the cap can be reduced when modified AGI exceeds $505,000, or $252,500 for married filing separately. The reduction is generally 30% of the excess, subject to a $10,000 floor, or $5,000 if married filing separately.
| SALT item | Potential Schedule A treatment |
|---|---|
| Eligible home property tax | Generally counts toward SALT when legally imposed and paid, subject to limitations. |
| State income tax | May be included as an alternative to general sales tax. |
| General sales tax | May be selected instead of deductible state/local income taxes. |
| Local personal property tax | May qualify where it meets the federal requirements. |
| Mortgage principal | Not a SALT deduction. |
| Homeowners insurance | Generally not deductible for a personal-use home. |
| HOA fees | Generally not deductible as personal property taxes. |
Does escrow count as property tax?
Depositing money into a mortgage escrow account is not by itself the same as paying an eligible property tax. The relevant payment generally occurs when the tax is actually paid to the taxing authority. Compare the lender’s year-end escrow history against your property tax records.
What does the calculator do with SALT?
It adds the eligible property tax and the state/local income-or-sales-tax input, then applies the 2026 general cap and an estimated income-based reduction. It uses entered AGI as a proxy for SALT modified AGI, so special income adjustments and unusual tax circumstances require the official Schedule A calculation.
Refinancing, HELOCs, Second Homes and Rental Property
Can refinancing preserve the old $1 million mortgage limit?
In some cases, refinancing eligible pre–December 16, 2017 acquisition debt preserves grandfathered treatment for the qualified refinanced portion. Additional borrowed amounts may be treated differently, and special refinancing term limitations can apply.
Do not automatically choose the old-debt category just because a refinanced loan replaced an older mortgage. Examine the original eligible debt, the amount refinanced, any cash-out proceeds, the property securing the loan and the IRS rules.
Is HELOC interest deductible?
Interest on home equity loans and home equity lines of credit can qualify when loan proceeds are used to buy, build or substantially improve the home securing the debt, subject to applicable acquisition debt limitations.
Using the funds for personal expenses such as credit card balances, vacations or ordinary household spending generally does not qualify that interest as a personal home mortgage interest deduction.
Can you deduct interest on a second home?
Potentially yes. A qualifying second home can be included under the home mortgage interest rules, subject to residence-use requirements and the combined mortgage debt ceiling. You do not receive an independent $750,000 limit for each house.
Is rental-property mortgage interest covered?
Mortgage interest attributable to a rental property is generally considered under rental income and expense rules, often on Schedule E, rather than as personal qualified residence interest on Schedule A. Mixed rental and personal use may require allocation and special limitations.
How to Claim a Mortgage Interest Deduction on Your 2026 Tax Return
- Get Form 1098 from your lender. Visit your mortgage servicer’s annual tax-document section or request your 2026 Mortgage Interest Statement. Review interest in Box 1, principal information in Box 2, the loan origination date in Box 3 and mortgage insurance premiums in Box 5 where reported.
- Check that your mortgage qualifies. Open IRS Publication 936. Confirm that the debt is secured by a qualified residence, the loan proceeds were used for a permitted purpose and any applicable combined debt ceiling is satisfied.
- Determine the eligible interest. If your mortgage is within the applicable limit and otherwise qualifies, the interest may generally be fully deductible. For higher debt balances or complex loans, follow the IRS qualified loan limit and average-balance worksheet.
- Review points and PMI separately. Determine which points are deductible in 2026, including any amortized amount. Check whether 2026 mortgage insurance premiums qualify and whether the applicable AGI phaseout affects them.
- Collect your other Schedule A expenses. Gather eligible property tax payments, state income or sales tax records, charitable contribution documentation and other allowable itemized deductions. Use IRS Schedule A guidance for classification and limitations.
- Compare against your standard deduction. Use the 2026 filing-status amount and any applicable additional standard deduction. Determine whether itemizing actually lowers your federal tax relative to the standard deduction and other deductions available without itemizing.
- Complete the applicable Schedule A lines. Under the 2026 draft form structure, mortgage interest from Form 1098 is reported on line 8a, certain unreported interest on 8b, points not on 1098 on 8c and eligible mortgage insurance premiums on 8d. Confirm the finalized 2026 form instructions before filing.
- File your federal income-tax return. Complete your 2026 Form 1040 or 1040-SR and Schedule A if itemizing. Keep your Form 1098, closing disclosure, property tax records, loan-use evidence and applicable worksheets with your records.
Why Your Mortgage Interest Deduction May Be Smaller Than Expected
| Situation | Possible cause | What to check |
|---|---|---|
| Calculator shows $0 tax savings | Standard deduction or other applicable adjustments may produce a comparable or better tax outcome. | Compare total allowed itemized deductions with the standard deduction. |
| Form 1098 interest is higher than deductible interest | Loan debt ceiling, mixed loan use or other restrictions. | Use Publication 936 average-balance and debt-limit worksheet. |
| Mortgage insurance deduction disappears | Income-based PMI phaseout or ineligible insurance contract. | Review contract date, acquisition debt and AGI. |
| Points deduction is smaller than closing statement amount | Points may need to be deducted over several years. | Check Publication 936 and refinancing rules. |
| Home equity interest is not deductible | Funds were used for nonqualified personal purposes. | Trace loan proceeds to the qualifying home improvements or acquisition. |
| Property tax amount differs from escrow deposits | Escrow funds may not all have been paid to the taxing authority. | Check actual property tax disbursements. |
| Tax preparer produces a different result | AMT, credits, capital gains, additional standard deduction, special income or other tax rules. | Compare the complete federal return and worksheets. |
| Mortgage is jointly owned | Interest may need allocation among the people legally entitled to deduct it. | Check actual payments, ownership and shared-interest reporting guidance. |
Top 10 Mortgage Interest Tax Deduction FAQs for 2026
1. How much mortgage interest can I deduct in 2026?
You may generally deduct eligible interest on up to $750,000 of qualifying newer acquisition debt, or $375,000 if married filing separately. Certain qualifying older mortgages retain higher limits of $1 million or $500,000. Other rules may limit the deduction, and you generally must itemize.
2. What is the mortgage interest deduction limit for married couples in 2026?
For most qualifying newer loans, married couples filing jointly generally share a $750,000 acquisition debt ceiling. Eligible older debt may have a $1 million ceiling. Married filing separately generally uses half those amounts, subject to other rules.
3. How much tax does $10,000 of mortgage interest save?
There is no fixed saving. A deduction reduces taxable income, not tax dollar for dollar. Your actual savings depend on whether itemizing is beneficial, your income and federal tax rate structure, and other allowed deductions.
4. Is mortgage interest deductible if I take the standard deduction?
Generally no separate Schedule A mortgage interest deduction is allowed when you claim the standard deduction. The mortgage costs may still help you decide whether itemizing would produce a lower federal tax bill.
5. Is PMI or FHA mortgage insurance deductible in 2026?
Qualified mortgage insurance premiums can again qualify beginning in 2026 for eligible acquisition debt and insurance contracts issued after 2006. Income phaseout rules and other conditions can reduce or eliminate the allowable amount.
6. Can I deduct mortgage points paid in 2026?
Qualifying points for a principal-home purchase may be deductible in the year paid if the IRS tests are met. Other points, including many refinancing points, generally must be deducted over the loan term.
7. Is HELOC interest tax deductible in 2026?
It may qualify when the borrowed money is used to buy, build or substantially improve the home securing the loan and the applicable debt limitations are met. Interest on funds used for unrelated personal expenses generally does not qualify for the personal home mortgage interest deduction.
8. Does refinancing affect mortgage interest deductions?
Yes. A refinancing can affect the loan’s eligible debt classification, qualifying balance, points and deductibility of cash-out proceeds. Certain qualifying older acquisition debt may retain grandfathered treatment, but extra borrowed amounts can have different rules.
9. Can I deduct property taxes along with mortgage interest?
Eligible property taxes may be deductible on Schedule A along with qualifying mortgage interest, subject to the state-and-local-tax limit. For 2026, the general SALT cap is $40,400, or $20,200 married filing separately, with a reduction for specified higher incomes.
10. Where do I report mortgage interest on my 2026 tax return?
Qualified personal home mortgage interest is generally reported on Schedule A with Form 1040 or 1040-SR. The mortgage interest and points section includes amounts reported on Form 1098 and qualifying unreported interest or points. Eligible 2026 mortgage insurance premiums have a separate Schedule A line under the draft form structure.
IRS Sources for 2026 Mortgage Interest Tax Deductions
These references support the main tax rules and provide the instructions needed for special cases.
- IRS Publication 936 — Home Mortgage Interest Deduction: acquisition debt, points, loan limits, average loan balance, second homes and mixed-use loans. The available publication is for 2025; check for its 2026 revision before filing.
- IRS Publication 505 (2026): 2026 standard deduction information, SALT changes, charitable deductions and mortgage insurance reinstatement.
- IRS Schedule A — Itemized Deductions: reporting mortgage interest, points, insurance premiums, taxes and other eligible deductions.
- IRS Form 1098 — Mortgage Interest Statement: lender-reported interest, points and mortgage insurance information.
- IRS Publication 530 — Tax Information for Homeowners: property expenses and homeowner tax treatment. Verify the 2026 edition for updated mortgage insurance information.
- IRS Topic 504 — Home Mortgage Points: current-year points versus amortized points.
- IRS 2026 Inflation Adjustments: 2026 federal income tax brackets and standard deductions.
- IRS Topic 506 — Charitable Contributions: deductible gifts and 2026 non-itemizer rules.
- Public Law 119-21: enacted changes covering mortgage interest, mortgage insurance, SALT and itemized deductions.
The tool estimates 2026 federal regular income-tax savings. It does not calculate state income-tax benefits or every IRS exception. Read the finalized 2026 filing instructions when preparing your 2027 return.
Check the Tax Benefit, Not Just the Interest Amount
Mortgage interest is a potentially useful deduction, but the size of the tax benefit depends on what you can legally deduct and whether itemizing improves your overall federal tax result. Start with accurate Form 1098 and loan information, then compare all qualified deductions with the standard deduction.
TaxCalculatorUSA.org is an independent educational website, not the IRS, a government housing program, a mortgage lender or a tax-return filing service. Results are planning estimates, not a guarantee of an allowed deduction or tax refund.