Mortgage Interest Deduction 2026: Complete Tax Guide
The $750K limit, HELOC deductibility rules, whether to itemize or take the standard deduction, and exactly how much you'll save in taxes — with real numbers.
David Rodriguez
Refinance & Rate Specialist • NMLS • 15+ Years
Published April 16, 2026 • 14 min read
📋 2026 Mortgage Interest Deduction: Key Facts
Source: IRS Publication 936, TCJA as extended. Consult a tax professional for your specific situation.
How Much Mortgage Interest Can You Deduct in 2026?
The deductible amount depends on your loan balance, interest rate, and loan origination date. Here are real examples based on April 2026 mortgage rates (6.75% on a 30-year fixed):
| Loan Balance | Year 1 Interest | Deductible Amount | Tax Savings (22%) | Tax Savings (32%) |
|---|---|---|---|---|
| $250,000 | $16,750 | $16,750 | $3,685 | $5,360 |
| $400,000 | $26,800 | $26,800 | $5,896 | $8,576 |
| $500,000 | $33,500 | $33,500 | $7,370 | $10,720 |
| $750,000 (limit) | $50,250 | $50,250 | $11,055 | $16,080 |
| $900,000 (over limit) (capped) | $60,300 | $50,250 max | $11,055 | $16,080 |
| $1,200,000 (over limit) (capped) | $80,400 | $50,250 max | $11,055 | $16,080 |
Assumes 6.75% rate, 30-year term. Tax savings = deductible amount × marginal tax rate. This is the maximum savings if you itemize AND the deduction exceeds the standard deduction. Calculate your exact savings →
Should You Itemize or Take the Standard Deduction in 2026?
The mortgage interest deduction only benefits you if your total itemized deductions exceed the standard deduction. Since TCJA doubled the standard deduction, only ~14% of taxpayers now itemize (down from ~30% before 2018). Here's how to calculate your situation:
🧮 Standard vs Itemize Calculator
Add up your potential itemized deductions and compare:
✅ Example: Itemize IS Worth It
Profile: Married couple, $450K mortgage at 6.75%
Mortgage interest: $30,375
Property taxes: $7,500 (SALT cap applies)
State income taxes: $2,500 (SALT max hit)
Charitable giving: $3,000
Total itemized: $43,375
Standard deduction: $30,000
Extra deduction: $13,375
Extra tax saved (22%): ~$2,943/year
❌ Example: Standard Deduction Wins
Profile: Single filer, $250K mortgage at 6.75%
Mortgage interest: $16,875
Property taxes: $3,000
Charitable giving: $500
Total itemized: $20,375
Standard deduction: $15,000
Extra itemized: $5,375
Extra tax saved (22%): only $1,183/year
→ Many single filers are better off with standard deduction for simplicity
Use tax software to calculate your exact benefit → — it automatically compares both options and picks the higher deduction.
HELOC & Home Equity Loan Interest: The 2026 Rules
The TCJA changed HELOC interest deductibility dramatically. Before 2018, you could deduct HELOC interest for ANY purpose. Now the rules are strict. If you're using a HELOC for home improvements, compare rates here — you may qualify for the deduction.
✅ HELOC Interest IS Deductible
- ✓ Buying a home (additional down payment)
- ✓ Building a home addition
- ✓ Kitchen or bathroom remodel
- ✓ Roof replacement
- ✓ HVAC system replacement
- ✓ Structural improvements
- ✓ Adding a pool or garage
❌ HELOC Interest NOT Deductible
- ✗ Paying off credit card debt
- ✗ Car purchase
- ✗ Vacation or travel
- ✗ College tuition
- ✗ Wedding expenses
- ✗ Business expenses (on personal home)
- ✗ Medical bills
⚠️ Documentation Critical: To claim the deduction, keep ALL contractor invoices, receipts, permits, and bank statements showing HELOC funds went directly to home improvement. The IRS requires proof of "substantial improvement" — paint touch-ups don't qualify, but a full kitchen remodel does.
💡 Maximize Your Mortgage Tax Deduction
Refinancing to a higher loan balance could increase your interest deduction — and lower your rate. Compare rates from 300+ lenders to find your best option.
Special Cases: Points, Rentals, and Second Homes
📍 Mortgage Points (Discount Points)
Points paid to reduce your interest rate are fully deductible in the year paid (if buying a primary home). One point = 1% of loan = $4,000 on a $400K mortgage. If paid on a refinance, you must deduct them ratably over the loan term (~$133/year for a 30-year refinance). Points paid by the seller on your behalf are also deductible by the buyer.
🏖️ Second Home / Vacation Home
Mortgage interest on a second home is fully deductible within the $750K combined limit. If you rent out your second home: Rented fewer than 15 days/year → treat as personal use, full deduction. Rented 15+ days/year → allocated between personal and rental use (Schedule E). Mixed-use (personal + rental) requires complex allocation of expenses.
🏠 Rental Property (Not Vacation)
Investment property mortgage interest is NOT deducted on Schedule A — it goes on Schedule E as a rental expense. This is actually BETTER — rental property interest reduces your rental income dollar-for-dollar with no mortgage limit cap, and no requirement to itemize.
🔄 Refinancing: What's Deductible
Rate-and-term refinance: Interest on the new loan is fully deductible (within $750K limit). Cash-out refinance: Interest is deductible on the original principal balance. Interest on the cash-out portion is only deductible if used for home improvement (same HELOC rules apply). Closing costs: Not deductible except points on a purchase mortgage.
⚠️ Will the Mortgage Interest Deduction Change After 2026?
The TCJA mortgage interest provisions were originally set to sunset after December 31, 2025. As of April 2026, Congress has extended these provisions. However, the political landscape remains volatile. Here's what to watch:
| Scenario | Mortgage Limit | Standard Deduction | Impact on You |
|---|---|---|---|
| TCJA Extended (current) | $750,000 | $30,000 (MFJ) | Status quo — most filers take standard deduction |
| TCJA Partially Extended | $750,000–$1M | $20,000–$25,000 | More filers would itemize; bigger deduction for high-value homeowners |
| TCJA Expires (pre-2018 rules) | $1,000,000 | ~$14,600 (MFJ) | More homeowners would benefit from itemizing again |
Strategy: If you're planning to buy or refinance in 2026, consider that deductibility rules may change in 2027+. For now, get pre-approved at today's rates and maximize your deduction while the $750K limit is in effect.
State Mortgage Interest Deductions: Extra Savings in 2026
Many states offer their own mortgage interest deductions separate from the federal deduction. Unlike federal rules, most states have NO loan limit cap:
| State | State Deduction? | Loan Limit | State Tax Rate |
|---|---|---|---|
| California | Yes | $1M (pre-TCJA rules) | 9.3–13.3% |
| New York | Yes | Full interest | 6.85–10.9% |
| Texas | No state income tax | N/A | 0% |
| Florida | No state income tax | N/A | 0% |
| Illinois | No | N/A | 4.95% |
| Pennsylvania | No | N/A | 3.07% |
| Virginia | Yes | Full interest | 5.75% |
| Maryland | Yes | Full interest | 5.75% |
California uses pre-TCJA federal rules for state purposes — $1M mortgage limit, which benefits high-value CA homeowners with jumbo loans.
❓ Frequently Asked Questions
Q: Is mortgage interest still deductible in 2026?
Yes — fully deductible on loans up to $750,000 (originated after Dec 16, 2017). You must itemize deductions to claim it. The standard deduction for 2026 is $15,000 (single) / $30,000 (married), so itemizing only benefits those with significant deductions.
Q: Can I deduct mortgage interest on a second home?
Yes — you can deduct mortgage interest on one primary residence plus one secondary home, subject to the combined $750K limit. If you rent out the second home, different rules apply depending on how many days you rent vs. use it personally.
Q: What form do I use to claim the mortgage interest deduction?
You'll receive Form 1098 from your mortgage servicer showing total interest paid. Report it on Schedule A (Form 1040) to itemize. Line 8a for secured debt on your main home, line 8b for secondary home. Your tax software handles this automatically.
Q: Can I deduct mortgage interest if I work from home?
The home office deduction and mortgage interest deduction are separate. You CAN claim a proportional deduction for mortgage interest on a dedicated home office (Schedule C or E), but this is separate from the Schedule A itemized deduction and has specific IRS requirements for "regular and exclusive use."
Q: What if I paid off my mortgage — can I deduct the payoff interest?
Yes — any mortgage interest paid during 2026 before the payoff is deductible. If you refinanced or sold, the interest through the closing date is deductible. The lender will send you Form 1098 showing all interest paid for the year.
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