Mortgage Tax Deduction
Does your mortgage actually lower your taxes? Compare your itemized deductions — mortgage interest plus capped SALT — against 2026's standard deduction and see the real savings, including when the honest answer is $0.
Everyone gets an automatic tax write-off — $32,200 for a married couple in 2026 — with no paperwork. Your mortgage only lowers your taxes if your specific write-offs add up to more than that. Enter what you know (we'll figure out your tax rate for you) and see the honest answer — even when it's zero.
How do you file your taxes?
This sets the standard deduction — the automatic write-off everyone gets without any paperwork. Your mortgage only helps if your specific write-offs add up to more than it. For 2026 it's $16,100 filing single, $32,200 for married couples filing together, and $24,150 for head of household (single with dependents).
Household income
Your total yearly income before taxes — what you and your spouse earn combined, roughly what your W-2s add up to. We use it to figure out your tax rate for you (no need to know your bracket) and to estimate your state income taxes.
Mortgage balance
What you currently owe on your mortgage — it's on your monthly statement. Interest counts on balances up to $750,000; above that, only a portion counts.
Interest rate
Your mortgage rate, from your statement or loan paperwork. We estimate this year's interest as your balance times your rate — close to exact for newer loans.
Property tax per year
What you pay in property taxes each year. It's on your county tax bill — or if your mortgage payment includes taxes, your yearly mortgage statement shows the amount paid from escrow.
Does your state have an income tax?
No state income tax covers Texas, Florida, Washington, Tennessee, Nevada, and a few others. High-tax states are places like California, New York, New Jersey, and Oregon. Everywhere else, pick typical. We estimate your state taxes from this and your income, and show you the number we used so you can judge it.
Your mortgage is lowering your taxes
$162/yr saved
your write-offs ($33,550) beat the automatic $32,200 by $1,350 — about $14/mo
What the savings really are — and how to grow them
Only the $1,350 above the automatic write-off saves you anything — the rest was yours for free. Two things this estimate leaves out, both in your favor: charitable donations stack on top once you're over the line, and if your loan includes mortgage insurance (PMI), that counts again starting in 2026 for households under $100k income. Your savings will shrink a little each year as your loan pays down — that's normal.
What we estimated and simplified — read before filing anything
We estimated your tax rate from your income and your state income tax from your state's typical rates — both shown above, so check them against your own numbers. Rules used are for tax year 2026. This is an educational estimate, not tax advice — confirm with tax software or a professional before making decisions.
Uses tax year 2026 rules: automatic (standard) deductions of $16,100 single / $32,200 married filing jointly / $24,150 head of household; state + property tax write-offs capped at $40,400; and mortgage interest counted on up to $750,000 of loan balance. Your tax rate and state tax are estimated from your income and shown above. Educational estimate — not tax, legal, or financial advice.
💡About this calculator▼
The mortgage interest deduction is the most famous tax break in American homeownership — and the most misunderstood. The common belief: owning a home means writing off your mortgage interest and pocketing thousands. The reality since 2018, reinforced by the 2025 tax law: the deduction only saves you money if all your itemized deductions together beat the standard deduction — and for tax year 2026 that bar sits at $16,100 for single filers and $32,200 for married couples filing jointly. Every dollar below the bar saves nothing, because you'd get the standard deduction anyway, mortgage or not. That's why most homeowners today take the standard deduction — and why this calculator's most common honest answer is "your mortgage saves you $0 in taxes, and that's normal."
Here's what actually goes into the comparison. Your mortgage interest — roughly your balance times your rate in the early years — is deductible on up to $750,000 of acquisition debt (a limit the 2025 law made permanent; loans from before December 16, 2017 keep the old $1 million cap). Your SALT deductions — property tax plus state income tax — are capped at $40,400 for 2026, a dramatically higher ceiling than the old $10,000 thanks to the 2025 law, though it phases down for incomes above $500,000 and is scheduled to revert to $10,000 in 2030. Add those together, and if the total clears your standard deduction, the *excess* — only the excess — reduces your taxable income, saving you that amount times your marginal bracket.
Enter your filing status, loan, rate, and taxes below. If itemizing wins, you'll see the real annual savings and its monthly equivalent. If it doesn't, you'll see that plainly too — along with the strategies (like bunching deductions) that can flip a close case, and the one piece of advice every honest tax page owes you: never buy more house for a deduction, because a deduction that saves 22 cents on the dollar is still 78 cents out the door. One more 2026 note worth knowing: mortgage insurance premiums are deductible again starting this tax year, phasing out above $100,000 of income — new since the 2025 law, and covered in the guide below. Educational estimate throughout; confirm anything you file with a tax professional.
Your itemized total, against the standard deduction, times your bracket — with 2026's caps applied.
Step 1 — deductible mortgage interest: ≈ loan balance × interest rate (the year-one figure; interest declines as the loan amortizes). Balances above $750,000 of acquisition debt get prorated — an $800k loan deducts 750/800ths of its interest.
Step 2 — SALT (state and local taxes): property tax + state income tax, capped at $40,400 for 2026. (High earners: this cap phases down above $500k of income — not modeled here.)
Step 3 — compare to your standard deduction (tax year 2026): • Single: $16,100 · Married filing jointly: $32,200 · Head of household: $24,150
Step 4 — the savings: only the amount your write-offs exceed the standard deduction counts. Savings = that excess × your top federal tax rate — which the calculator figures out for you from your income and filing status against the 2026 IRS brackets (10–37%), instead of asking you to know it.
Example — married couple, $120k income, $350k loan at 6.5%, $6k property tax, typical state: Interest $22,750 + state and property taxes $10,800 = $33,550 in write-offs vs the $32,200 standard → excess $1,350 → at their 12% rate, saves $162/yr. Technically an itemizing year — worth about $13 a month.
Same numbers, single filer: the automatic write-off drops to $16,100 and the tax rate rises to 22% → excess $17,450 → saves $3,839/yr. Filing status is the whole game.
📐How it's calculated▼
Savings = max(0, deductible interest + capped SALT − standard deduction) × marginal rate.
2026 constants: standard deduction $16,100 / $32,200 / $24,150 · SALT cap $40,400 · interest cap at $750k of acquisition debt
Example — the $0 case (and why it's common):
→ $200k balance × 6% = $12,000 interest + $10,000 SALT = $22,000 itemized → vs $32,200 MFJ standard → excess = $0 → savings = $0 → The couple takes the standard deduction — $10,200 more than their itemizables — and their mortgage rides along without producing a dime of tax benefit. This is most American homeowners since 2018.
Example — the cap at work:
→ $800k balance × 6.5% = $52,000 interest → capped: 52,000 × (750/800) = $48,750 deductible → + SALT $10,000 = $58,750 vs $32,200 → excess $26,550 × 24% = $6,372/yr saved
📎Sources:IRS — Tax inflation adjustments for tax year 2026 (Rev Proc 2025-32): standard deductions of $16,100 single, $32,200 married filing jointly, $24,150 head of household, and 2026 tax brackets,Thomson Reuters Tax & Accounting — What the 2025 Act means for itemized deductions: the $40,000+1%/yr SALT cap and phase-down, the permanent $750,000 mortgage interest limit, and mortgage insurance premiums deductible from 2026
🔍Finding your inputs▼
How you file your taxes: This sets your automatic write-off — the standard deduction everyone gets with zero paperwork. For 2026: $16,100 filing single, $32,200 for married couples filing together, $24,150 for head of household. Your mortgage only helps if your specific write-offs add up to more than this number, and notice what that means for couples: the married-filing-together hurdle is high enough that a typical mortgage plus typical taxes often *doesn't* clear it, while a single filer with the same house usually clears it easily.
Household income: Your total yearly income before taxes — roughly what your W-2s add up to, combined for a couple. You don't need to know your tax bracket: the calculator works out your top federal tax rate from your income and filing status using the 2026 IRS brackets, and shows you the rate it used. (It also powers the state tax estimate below.) One simplification to know about: we approximate your taxable income as income minus the standard deduction, so if you put a lot into a 401(k) or similar pre-tax accounts, your real rate could be one step lower — which would shrink the savings figure proportionally, not change the itemize-or-not answer.
Mortgage balance and rate: Both are on your monthly statement. The calculator estimates this year's interest as balance × rate — close to exact for newer loans, and a little generous for older ones, since the interest share of your payment shrinks as the loan pays down. Interest counts on up to $750,000 of the loan that bought or built your home; bigger balances have their interest scaled down proportionally. Fine print worth knowing: loans from before December 16, 2017 are grandfathered at a $1 million limit (this calculator uses $750k), and money from a cash-out refinance or home equity line only counts if it was spent on the home itself — a HELOC used to pay off credit cards earns no write-off.
Property tax per year: What you actually pay annually — on your county tax bill, or if your mortgage payment includes taxes, on the yearly statement showing what was paid from escrow. This combines with your state income tax into one capped category of write-offs: $40,400 total for 2026. That cap was $10,000 until the 2025 tax law quadrupled it — the single biggest reason itemizing is newly worthwhile in high-tax states — but it shrinks for incomes above $500,000 and is scheduled to fall back to $10,000 in 2030.
Does your state have an income tax: Pick the card that matches where you live: no state income tax (Texas, Florida, Washington, Tennessee, Nevada, and a few others), high-tax state (California, New York, New Jersey, Oregon and company), or typical for everywhere else. The calculator estimates your state income tax from this and your income — about 4% of income for typical states, 7% for high-tax ones — and displays the dollar figure it assumed in your results, so if you know your real number from a tax return, you can judge how close the estimate landed.
⚠️Special situations▼
Everyone told me buying a house would lower my taxes — why does this say $0?
Because the advice is a generation out of date, and you've just met the single most misunderstood fact in homeowner taxation. Before 2018, the standard deduction was low ($6,350 single / $12,700 joint in 2017), so nearly any mortgage pushed a household over the line and every interest dollar produced real savings — the folklore was true. The 2017 tax law nearly doubled the standard deduction, and the 2025 law made those levels permanent: for 2026 you get $16,100 single or $32,200 married filing jointly with zero receipts, zero itemizing, zero mortgage required. Your itemized deductions only matter above that line — and a typical mortgage ($250–350k balance) plus typical taxes often totals less than a couple's $32,200 bar, which is why the majority of American homeowners now take the standard deduction and their mortgages generate no tax benefit at all. Three honest implications. For homebuying math: run your affordability numbers assuming zero tax benefit (our home affordability calculator does), and treat any savings this calculator shows as upside, not budget — and be properly skeptical of anyone (lender, agent, relative) who cites 'the tax savings' as a reason to stretch. For couples vs singles: the same house that saves a single filer thousands can save a married couple nothing, because the joint standard deduction is twice as high while the house's deductions stay the same — one of the quiet marriage penalties on homeownership. For the future: your situation isn't static — a bigger loan, a high-tax state, rising property taxes, or major charitable giving can flip you into itemizing territory (the 2025 law's $40,400 SALT cap flipped many high-tax-state households already), so re-run this when circumstances change. And if you're perennially just under the line, read the bunching strategy in the next section — it exists precisely for you.
I'm close to the standard deduction line — what's this 'bunching' strategy?
Bunching is the practice of concentrating deductible expenses into alternating years so you clear the standard deduction decisively in the 'on' years and take the standard deduction in the 'off' years — legitimately capturing deductions that annual-rhythm filing would waste. The logic: suppose a married couple's recurring itemizables total $30,000 against a $32,200 standard deduction. Filed normally, they take the standard every year and their $30,000 of expenses buys nothing. Now move $6,000 of controllable deductions from next year into this year: this year's total hits $36,000 (itemize, $3,800 over the bar), next year's drops to $24,000 (take the standard — which hands them $8,200 more than their expenses anyway). Same money spent, thousands more deducted across the two years. What's actually movable: charitable giving is the big one — December vs January timing is entirely yours, and a donor-advised fund industrializes the move (contribute two or three years of giving in one deductible lump, then grant it to charities on your own schedule); property taxes are sometimes movable — many counties bill in installments spanning the calendar year-end, and paying January's installment in December pulls it into this tax year (mind the SALT cap when you do — prepaying past $40,400 wastes the excess, and note prepaying *assessed* future-year taxes isn't allowed); medical expenses (deductible above 7.5% of AGI) bunch naturally when you can schedule procedures; and state estimated-tax timing offers modest play for the self-employed. What's not movable: mortgage interest accrues when it accrues — beyond one extra January payment made in December, you can't meaningfully shift it. Execution notes: the strategy needs multi-year attention (an 'on' year only pays off if you actually take the standard in the 'off' year), cash flow to front-load, and — like everything on this page — a check against your full return, since AMT, phase-outs, and state taxes can complicate it. For a couple hovering within $5,000 of the line, bunching is often worth four figures per two-year cycle, which is a good hourly rate for one planning conversation.
I have a HELOC / did a cash-out refinance — is that interest deductible?
Only to the extent the money bought, built, or substantially improved the home securing the loan — the use of the proceeds, not the name of the loan, decides everything. The rule since 2018 (made permanent by the 2025 law): deductible mortgage interest is interest on 'acquisition indebtedness' — debt used to acquire, construct, or substantially improve your main or second home, capped at $750,000 total. A HELOC used to build an addition, renovate a kitchen, or replace a roof? That interest is deductible (within the cap, and it counts against the same $750k). The identical HELOC used to pay off credit cards, buy a car, or cover tuition? Not deductible — at all, no matter that the loan is secured by your house. Cash-out refinances split the same way: the portion refinancing your existing acquisition balance stays deductible; the cash-out portion is deductible only if it went into the home. Practical implications: keep records tying HELOC/cash-out proceeds to improvement invoices — 'tracing' is the IRS term, and it's your documentation burden if asked; if you carry mixed-use debt, only the improvement share of the interest belongs in a calculator like this one (enter an adjusted balance to approximate it); and when comparing debt-consolidation options, price the HELOC honestly at its full rate, not a fantasy after-tax rate — for non-improvement uses there is no tax discount, and even for improvement uses there's none unless you itemize past the standard deduction (the theme of this page). Two adjacent notes: the pre-TCJA world where $100k of home-equity interest was deductible regardless of use is gone — advice from before 2018 on this is obsolete; and points paid on a purchase mortgage are generally deductible in full in year one, while refinance points amortize over the loan's life — a detail worth a tax-software prompt in a refi year. When the amounts are large, this specific area — tracing, mixed use, the $750k allocation — is genuinely a tax-professional question rather than a calculator question.
How do the 2025 tax law changes (OBBBA) affect my mortgage deductions going forward?
The 2025 law — the One Big Beautiful Bill Act — reshaped homeowner deductions more than anything since 2017, and it cuts in both directions depending on your situation and the calendar. What it made permanent: the TCJA-era framework you're living with — the high standard deduction (2026: $16,100/$32,200/$24,150, inflation-adjusted annually) and the $750,000 acquisition-debt cap on mortgage interest — are no longer scheduled to sunset; the pre-2018 rules ($1M cap, low standard deduction) are not coming back. What it expanded: the SALT cap jumped from $10,000 to $40,000 for 2025, rising 1% annually ($40,400 in 2026, continuing through 2029). This is the change with teeth for homeowners in high-tax states — a New Jersey or California household paying $25,000 of combined property and income tax went from deducting $10,000 to deducting all of it, which single-handedly flipped many such households from standard-deduction takers back into itemizers. Two constraints ride along: the expanded cap phases down for modified AGI above $500,000 (reduced by 30% of the excess, hitting the $10,000 floor around $600,000 — high earners largely keep the old cap), and the entire expansion sunsets back to $10,000 in 2030 unless Congress acts — so the itemizing window for high-tax-state households is, under current law, a five-year window worth using while it exists. What it revived: mortgage insurance premiums (PMI and FHA MIP) count as deductible residence interest again starting in tax year 2026, phasing out above $100,000 AGI — worth a few hundred dollars a year to typical PMI payers who itemize, and one more nudge over the standard-deduction line for close cases. Planning takeaways: re-run your itemize-vs-standard math now if you're in a high-tax state (the answer may have changed in 2025), don't build long-term plans on the $40k SALT cap surviving past 2029, and remember every figure here inflation-adjusts annually — this calculator uses tax year 2026 and gets re-verified against IRS publications, but your filing software has the final word for your year.
❓Common questions▼
Is mortgage interest tax deductible?
Yes — but for most homeowners it no longer actually reduces their taxes, and understanding that distinction saves both false hope and bad decisions. Mortgage interest on up to $750,000 of acquisition debt (the loan that bought, built, or substantially improved your main or second home) is deductible as an itemized deduction on Schedule A — a limit the 2025 tax law made permanent, with loans originated before December 16, 2017 grandfathered at $1 million. The catch is the word itemized: you deduct mortgage interest only by giving up the standard deduction, which for tax year 2026 is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household. Unless your mortgage interest plus your other itemized deductions — chiefly state and local taxes, capped at $40,400 in 2026, and charitable gifts — exceed that standard deduction, itemizing would cost you money, and the rational move is taking the standard deduction, at which point your mortgage interest produces zero tax benefit. That's the position of most American homeowners since 2018. When itemizing does win, the benefit equals only the excess over the standard deduction times your marginal bracket — not your full interest times your bracket. A married couple with $33,550 of write-offs against a $32,200 standard deduction saves about $160 a year, technically itemizing but effectively getting nothing; the same numbers for a single filer save nearly $4,000. The calculator above runs your specific comparison. Also deductible in the same family: mortgage insurance premiums (newly restored starting tax year 2026, phasing out above $100,000 AGI) and interest on home-improvement HELOC debt — while interest on cash-out or HELOC money used for anything other than the home is not deductible at all.
Should I itemize or take the standard deduction as a homeowner?
Take whichever is larger — it's purely arithmetic, not strategy or identity — and for 2026 that means comparing your itemizable total against $16,100 (single), $32,200 (married filing jointly), or $24,150 (head of household). Add up your three big itemizables: mortgage interest (roughly balance × rate in a loan's early years, on up to $750,000 of acquisition debt), SALT — property tax plus state income tax, capped at $40,400 — and charitable donations. Over the bar? Itemize, and your tax savings equal the excess times your marginal bracket. Under it? The standard deduction is the better deal, full stop — it's the bigger number, no receipts required, and 'wasting' your mortgage interest by not itemizing costs you nothing since the standard deduction already exceeds it. Patterns worth knowing: married couples clear the bar far less often than single filers, because the joint standard deduction is double while the house's deductions are the same — the identical mortgage that does nothing for a couple can save a single filer thousands. High-tax-state households got the biggest 2025-law upgrade: the SALT cap's jump from $10,000 to $40,000+ flipped many of them back into itemizing, so if you last checked before 2025, check again. New loans itemize more easily than old ones (early payments are interest-heavy; a decade in, the interest may be half what it was). And close calls have a play: bunching — concentrating charitable gifts or a movable property-tax installment into alternating years — clears the bar decisively every other year instead of missing it annually. Two cautions: never buy or keep a bigger mortgage to manufacture a deduction (even at the 37% bracket, a dollar of interest returns at most 37 cents), and treat any calculator — including ours above — as the estimate that tells you whether to look closer, with tax software or a professional running your actual return as the final word.
How much does the mortgage interest deduction actually save?
For most homeowners: nothing, because they correctly take the standard deduction. For those who itemize: typically a few hundred to a few thousand dollars a year, equal to (itemized total − standard deduction) × marginal bracket — almost always far less than the folklore suggests. Concrete 2026 examples: a married couple earning $120,000 with a $350,000 loan at 6.5% ($22,750 interest) plus $10,800 of state and property taxes has $33,550 in write-offs against a $32,200 standard deduction — $1,350 of excess, worth about $160 a year at their 12% rate. That's the honest shape of the 'huge homeowner tax break' for a typical couple: technically an itemizing year, effectively a rounding error. The same house and numbers for a single filer: $17,450 over their $16,100 standard deduction, saving about $3,839 — filing status, not the mortgage, made the difference. A high-tax-state couple ($30,000 property + $15,000 state income tax, capped at $40,400) with a $500,000 loan saves around $13,400 at the 35% bracket — the profile the 2025 SALT expansion genuinely transformed. What moves the number: filing status (the biggest lever), state taxes (the second), loan size and age (interest shrinks every year as you amortize — an itemizing household today drifts toward the standard deduction over time), and bracket (higher brackets save more per excess dollar — the deduction is worth most to those who need it least, a long-standing criticism of the policy). What it means for decisions: count these savings as a pleasant rebate, never as affordability — a deduction returning 22–37 cents per interest dollar can't justify paying the dollar — and if your savings figure is small-but-positive, check whether bunching deductions into alternate years would grow it. Run your own numbers in the calculator above; the honest answer takes thirty seconds.
What is the SALT deduction cap for 2026, and does it affect my mortgage math?
The SALT cap for tax year 2026 is $40,400 — and it affects your mortgage math profoundly, because state and local taxes are the deduction that usually decides whether your mortgage interest gets to matter at all. The mechanics: SALT covers your property taxes plus either state/local income taxes or sales taxes (your choice of one), all sharing a single cap. The 2025 tax law raised that cap from the $10,000 it had been since 2018 to $40,000 for 2025, rising 1% annually — $40,400 for 2026 — through 2029, after which it reverts to $10,000 under current law unless Congress extends it. Two fine-print items: married-filing-separately caps are half, and the expanded cap phases down for modified AGI above $500,000 (reduced by 30% of the excess, reaching the old $10,000 floor around $600,000 — so the highest earners effectively keep the old cap). Why this is mortgage math: itemizing is a team sport — your mortgage interest rarely clears the standard deduction alone, and SALT is its biggest teammate. Under the old $10,000 cap, a high-tax-state couple's team maxed out early ($10k SALT + interest vs a $30k+ standard deduction) and often lost; at $40,400, that same couple's full property and income taxes count, and many flipped back into itemizing in 2025 — with every dollar of mortgage interest suddenly producing real savings at their bracket. If you last evaluated itemizing before 2025, re-run it: the answer genuinely may have changed. Planning notes: households near the cap should mind prepayment timing (prepaying property tax past $40,400 wastes the excess), high earners near $500,000 MAGI should model the phase-down before counting on the full cap, and everyone should treat the 2030 sunset as real when making long-horizon decisions — the current SALT generosity is, under present law, a window rather than a permanent feature. The calculator above applies the $40,400 cap automatically to your property-plus-state-tax entry.
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