Itemizing, $750K Limit, SALT Cap, Standard Deduction, Points
Mortgage Interest Deduction 2026: How It Works, Limits, and Who Benefits
The mortgage interest deduction saves money only if you itemize — and roughly 90% of taxpayers do not. Since the 2017 tax law doubled the standard deduction, the benefit matters primarily for large mortgages in higher tax brackets. Do not buy a home or take a larger mortgage “for the deduction” — the math does not support it.
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How It Works
- What you deduct: Interest paid on your mortgage, reported on Form 1098 by your lender each January for the prior tax year
- Where: Claimed on Schedule A (Itemized Deductions) — only benefits you if total itemized deductions exceed the standard deduction
- Savings: Reduces taxable income, not tax directly — $20,000 deduction in the 24% bracket saves $4,800 in federal tax
- Action: Run your taxes both ways (standard vs itemized) before deciding — tax software does this comparison automatically
Key Limits
- Debt limit: Interest deductible only on the first $750,000 of qualified mortgage debt (post-12/15/2017 loans)
- Grandfathered: Mortgages originated before December 15, 2017 use the previous $1,000,000 limit instead
- Combined total: The $750,000 limit covers all qualified residences combined — primary home plus one second home
- Action: If your mortgage exceeds $750K, only a proportional share of your interest is deductible each year
Standard Deduction 2026
- Single: $15,700 — your total itemized deductions must exceed this amount for itemizing to save you anything
- Married filing jointly: $31,400 — many homeowners with mortgages under $400K fall below this threshold
- Head of household: $23,150 — in between single and married, slightly more likely to benefit from itemizing
- Action: Add mortgage interest + SALT ($10K cap) + charitable — if total is below your standard deduction, do not itemize
Who Benefits Most
- Large mortgage: Balances of $500,000+ generate enough interest ($25K–$35K/year) to make itemizing worthwhile
- Higher bracket: 24%+ marginal tax rate means each dollar of deduction saves more in actual tax dollars
- Early loan years: Interest is highest in years 1–10 of the loan — the deduction shrinks as principal is paid down
- Action: Reassess annually — itemizing may stop making sense as your balance decreases and interest shrinks over time
Frequently Asked Questions
Should I itemize or take the standard deduction?
Does the deduction apply to my first year of homeownership?
Should I buy a bigger house for the tax deduction?
The Bottom Line Up Front
The mortgage interest deduction saves money only if you itemize your tax deductions — and since the 2017 tax law nearly doubled the standard deduction, roughly 90% of taxpayers take the standard deduction instead. The deduction matters primarily for homeowners with large mortgages ($500,000+) in higher tax brackets (24%+) during the early years of the loan.
If your total itemized deductions do not exceed the standard deduction for your filing status, the mortgage interest deduction saves you nothing. Run both calculations annually. And never buy a home or take a larger mortgage “for the deduction” — every dollar of interest you pay to get a deduction costs you more than the deduction returns. The math does not support that logic under any tax bracket.
How Does the Mortgage Interest Deduction Work?
You deduct the interest portion of your mortgage payments from your taxable income when you file your federal tax return. Your lender sends Form 1098 each January showing the total interest paid during the prior calendar year. You report this amount on Schedule A (Itemized Deductions) along with your other deductible expenses.
The deduction reduces your taxable income — not your tax bill directly. A $20,000 interest deduction in the 24% marginal tax bracket saves $4,800 in federal tax. The same $20,000 deduction in the 12% bracket saves only $2,400. Your marginal tax rate determines how much each dollar of mortgage interest deduction is actually worth to you in real tax savings. Higher bracket borrowers benefit more from the same dollar of deduction.
Deal Math
On a $500,000 loan at 7%, you pay approximately $35,000 in interest during year one. In the 24% bracket, that deduction saves $8,400 in federal taxes — but only if your total itemized deductions exceed the standard deduction. If mortgage interest ($35K) plus SALT ($10K cap) plus charitable ($3K) totals $48K, you exceed the $31,400 married standard by $16,600 — saving approximately $3,984 beyond what the standard deduction already provides. The deduction’s real value is this marginal amount, not the full $8,400.
What Is the $750,000 Debt Limit?
Mortgage interest is only deductible on the first $750,000 of qualified mortgage debt for loans originated after December 15, 2017. Mortgages originated before that date retain the previous $1,000,000 limit under grandfathering rules that remain in effect as long as the original loan is not refinanced into a larger balance.
The $750,000 limit applies to the combined total of all qualified residence debt — your primary home and one second home. If you carry a $600,000 first mortgage and a $200,000 home equity loan used for home improvements, only $750,000 of the combined $800,000 qualifies for the interest deduction. Interest attributable to the remaining $50,000 of debt above the limit is not deductible on your federal return. For a $900,000 mortgage, approximately 83% of your interest is deductible ($750K divided by $900K) and the remaining 17% is not.
Should You Itemize or Take the Standard Deduction?
This is the critical decision that determines whether the mortgage interest deduction saves you any money at all. You should itemize only when your total itemized deductions exceed the standard deduction for your specific filing status. Most homeowners with mortgages under $400,000 and without significant SALT or charitable deductions are better off with the standard deduction.
The 2026 standard deduction amounts: $15,700 for single filers, $31,400 for married filing jointly, and $23,150 for head of household. Add up your mortgage interest (from Form 1098), state and local tax deduction (capped at $10,000 under current law), charitable contributions, and any medical expenses exceeding 7.5% of your adjusted gross income. If that total exceeds your standard deduction, itemizing saves you money. If the total falls below your standard deduction, take the standard — you owe less tax that way regardless of how much mortgage interest you paid during the year.
Can You Deduct Mortgage Points?
Discount points paid on a purchase mortgage are generally deductible in full in the year they are paid at closing. Points paid on a refinance must be amortized — spread evenly — over the life of the new loan. If you refinance into a 30-year mortgage and pay $4,000 in discount points, you deduct $133 per year for 30 years rather than claiming the full $4,000 in the year of the refinance.
To deduct purchase points in the year paid, the points must be customary for your geographic area, paid at or before closing, and computed as a standard percentage of the loan amount. Most conventional discount points meet these criteria automatically. The deduction is claimed on Schedule A along with your regular mortgage interest. If you sell or refinance the home before the amortization period ends on refinance points, you can deduct the remaining unamortized balance in the year of sale or refinance.
How Does the Second Home Interest Deduction Work?
The mortgage interest deduction covers your primary residence and one second home (vacation property). The second home must have sleeping, cooking, and bathroom facilities to qualify. If you rent the second home out for more than 14 days per year, special rules apply — the portion of interest allocable to rental use is deducted on Schedule E as a business expense instead of Schedule A as a personal deduction.
Investment properties that are not second homes follow different rules entirely. Mortgage interest on rental investment properties is deducted as a business expense on Schedule E against rental income — not as an itemized deduction on Schedule A. This rental property interest deduction is separate from the personal mortgage interest deduction, is not subject to the $750,000 qualified residence debt limit, and is available regardless of whether you itemize or take the standard deduction on your personal return.
Lender Reality Check
Do not take a larger mortgage or pay more interest to get a bigger tax deduction. This is one of the most persistent financial myths in homeownership. Every dollar of interest you pay to capture a deduction costs you more than the deduction returns. A $1 interest payment in the 24% bracket saves $0.24 in taxes — you are still $0.76 worse off than if you had not paid the interest at all. The deduction makes an existing mortgage less expensive after taxes. It does not make intentionally paying more interest a rational financial strategy.
How Do SALT Caps Affect the Mortgage Interest Deduction?
The $10,000 cap on state and local tax (SALT) deductions, combined with the higher standard deduction from the 2017 tax law, is the primary reason fewer homeowners benefit from itemizing today compared to before 2018. Previously, homeowners in high-tax states could deduct unlimited state income taxes and property taxes, which pushed their total itemized deductions well above the standard deduction for most filers.
With SALT now capped at $10,000, many homeowners in moderate-tax states find their itemized total — mortgage interest ($15,000–$25,000) plus SALT ($10,000 cap) plus charitable ($2,000–$5,000) — comes to $27,000–$40,000, which barely exceeds or falls below the $31,400 standard deduction for married couples filing jointly. The marginal benefit of itemizing has shrunk dramatically for this group of taxpayers. Homeowners in high-tax states like California, New York, New Jersey, and Connecticut are hit hardest by the SALT cap because their state taxes alone would have exceeded $10,000 before the cap was imposed.
File Guidance
Run your taxes both ways — with the standard deduction and with itemized deductions — before making a decision each year. Tax software performs this comparison automatically and recommends the option that saves you more. In years when you make large charitable donations, have high medical expenses, or are in the early years of a large mortgage when interest is highest, itemizing may win. In later loan years when your interest payments have decreased due to principal paydown, the standard deduction often becomes the better choice. The optimal decision can change from year to year as your financial situation evolves.
The Bottom Line
The mortgage interest deduction is a real tax benefit — for homeowners who itemize. Since the 2017 tax law changes increased the standard deduction and capped SALT at $10,000, most homeowners are better off taking the standard deduction. The benefit matters most for large mortgages ($500K+) in higher brackets (24%+) during the early years of the loan.
The deduction should never be a reason to buy a home, take a larger mortgage, or avoid paying down principal faster. It makes an existing mortgage less expensive after taxes — nothing more. Run both tax scenarios annually and choose whichever method saves you the most money for that specific tax year.
Frequently Asked Questions
Can I deduct mortgage interest on a rental property?
Yes, but on Schedule E as a business expense against rental income — not on Schedule A as a personal deduction. Rental property mortgage interest is not subject to the $750,000 personal mortgage debt limit and is available regardless of whether you itemize or take the standard deduction on your personal return.
What if my mortgage exceeds $750,000?
Only interest on the first $750,000 of qualified debt is deductible. Interest attributable to the balance above $750,000 is not deductible. For example, on a $900,000 mortgage, approximately 83% of your interest is deductible and the remaining 17% is personal, non-deductible interest expense.
Is the mortgage interest deduction going away?
The current $750,000 limit and SALT cap are part of the Tax Cuts and Jobs Act, provisions of which are scheduled to be reviewed by Congress. Future legislation could change the debt limit, the SALT cap, or the standard deduction amount. Check current IRS guidance for the applicable tax year.
Can I deduct mortgage insurance premiums?
The PMI deduction has been extended and expired multiple times in recent years. When available, it is claimed on Schedule A and phases out above $100,000 AGI. Check current IRS publications for whether the deduction is active for your specific tax year — this provision is not permanent.
Does prepaid interest at closing count?
Yes. Per-diem interest paid from your closing date to the end of that month is deductible in the year of closing. This amount appears on your closing disclosure and is included on your first Form 1098 from the lender along with regular monthly interest payments.
Can I deduct home equity loan interest?
Only if the home equity loan funds were used to buy, build, or substantially improve the home securing the debt. Interest on home equity debt used for other purposes (debt consolidation, car purchase, college tuition) is not deductible under current tax law regardless of whether you itemize.