How Much Mortgage Interest Can I Actually Deduct?

Let’s be honest—buying a house is the American dream, but the mountain of paperwork that follows? That feels a bit more like a headache. If you’ve spent any time lately staring at your bank statements and wondering, “how much mortgage interest can I deduct on my taxes,” you are definitely in good company. It’s the number one question we get here at ALT Financial Network every single January.

The short answer is: a lot. But—and there’s always a “but” with the IRS—it’s not a blank check. The rules have changed a lot over the last few years, and as we move through 2026, we’re actually approaching another big shift in the tax code.

Here’s the “too long; didn’t read” version before we dive into the weeds:

• You can usually write off your interest and property taxes.
• You must itemize. If you take the standard deduction, these breaks don’t help you.
• There are caps on how much debt the IRS will let you “discount.”

The Breakdown: What’s “In” and What’s “Out”?

Most people see one big lump sum leave their bank account every month. A mortgage broker in California calls that your PITI (Principal, Interest, Taxes, and Insurance). But the IRS doesn’t see it as one number. They see it as four separate buckets, and they are very picky about which ones they’ll let you touch.

Principal: The “No” Bucket

The principal is the actual money you borrowed. Paying this back is basically moving money from your bank account into your home’s equity. Because you’re “paying yourself” in a way, the IRS doesn’t give you a tax break for it. None. Zip.

Interest: The “Yes” Bucket (With Rules)

This is where the magic happens. You can deduct the interest you pay, but keep the $750,000 cap in mind. If your mortgage is larger than $750k (and you bought after late 2017), you can only deduct the interest on that first $750,000.

The bank will send you a Form 1098 by the end of January. That’s your golden ticket. It tells you exactly what you paid in interest over the last year.

Real Estate Taxes: The “Yes” Bucket

How much mortgage interest can I deduct on my taxes? You can deduct your property taxes, but remember the “SALT” cap. The IRS only lets you deduct a total of $10,000 for all your state and local taxes combined. If you live in a high-tax state, you’ll likely hit this limit before you even finish your return.

Insurance: The “Forget About It” Bucket

Homeowners insurance? Not deductible. Title insurance? Nope. Private Mortgage Insurance (PMI)? That used to be deductible, but that ship sailed back in 2021. For now, insurance is just a cost of doing business as a homeowner.

The 2026 “Sunset” Drama

Here is something your neighbor probably doesn’t know: the current rules (the $750k limit and the $10k SALT cap) were part of the Tax Cuts and Jobs Act. That law is set to expire after this year.

If Congress doesn’t act, the mortgage interest deduction limit could actually jump back up to $1 million in 2027. We’re keeping a close watch on the legislation, but for your 2025/2026 filing, keep that $750k number in your head.

Home Equity: Only If You’re Improving

Can you deduct interest on a Home Equity Line of Credit (HELOC)? Only if you used the money to “buy, build, or substantially improve” the home. If you used that HELOC to pay for a wedding or a new car, that interest is 100% off-limits for your taxes.

Does It Even Matter? (The Itemization Choice)

This is the part that trips people up every year. You can keep asking how much mortgage interest rate can I deduct on my taxes, but you only get these deductions if you itemize.

The IRS gives everyone a “Standard Deduction” (it’s a pretty big number these days). If your mortgage interest, property taxes, and charitable gifts don’t add up to more than that standard amount, you’re actually better off just taking the flat rate and moving on with your life. Read more about mortgage tax deductions in our blog: Are Real Estate Broker Fees Tax Deductible?

FAQs

1. Can I deduct interest if I refinanced?

Yes, but it’s tricky. If you did a “cash-out” refi and spent the cash on a boat, you can’t deduct the interest on that extra cash. If you just lowered your rate, you’re fine.

2. What about my vacation home?

You can usually deduct interest on a second home too, as long as the total debt across both houses stays under that $750,000 limit.

3. Is the deduction better than the standard one?

Not always! For many people with smaller mortgages, the standard deduction is actually the better deal. Your tax pro can run the numbers both ways to see which one saves you more.

4. What records do I need to keep?

Save your Form 1098, your closing disclosures (if you bought or sold this year), and receipts for any big renovations. Don’t throw them away for at least three to seven years.

5. Are state rules different?

Often, yes. Some states are way more generous than the federal government, while others are stingier. Always check with a local pro who knows your state’s specific quirks.