How Buying a House Affects Your Tax Return

Most first-time buyers I worked with expected a big tax windfall after closing. The reality? The IRS estimates that only about 13% of all tax filers actually itemize their deductions, which means the majority of homeowners never directly claim a single mortgage-related tax break. That number stopped me cold when I first saw it. I’d spent years explaining mortgage interest deductions to borrowers, assuming they’d all benefit, and the truth is a lot more complicated than any mortgage brochure will tell you.

I’ll be honest: the tax story around homeownership is one of the most misunderstood parts of the whole buying process. Sellers and lenders talk up the “tax benefits” like they’re free money. Sometimes they are. Often they’re not. And what you actually get depends on your specific financial situation in ways that a five-minute conversation at closing just can’t cover.

What surprised me was how much the 2017 Tax Cuts and Jobs Act (TCJA) changed the calculus, and how many people are still operating on the old assumptions. The standard deduction nearly doubled under that law. For 2026, it sits at $15,000 for single filers and $30,000 for married couples filing jointly (these adjust slightly each year for inflation, so check the IRS site for the exact current figure). That means you only benefit from itemizing, and thus from homeowner-specific deductions, if your itemizable expenses exceed those amounts. A lot of homeowners, especially in lower cost-of-living areas, never cross that threshold.

The Mortgage Interest Deduction (What It Actually Does)

Here’s the part where most people get confused. The mortgage interest deduction doesn’t reduce your taxes dollar for dollar. It reduces your taxable income, which is a different and less exciting thing. If you’re in the 22% tax bracket and you paid $14,000 in mortgage interest last year, your deduction saves you $14,000 × 22% = $3,080. Not $14,000. That gap matters a lot when you’re deciding whether to buy.

Also: you can only deduct interest on the first $750,000 of mortgage debt for loans taken out after December 15, 2017. If you bought in a high-cost market, like metro areas where $900,000 starter homes aren’t unusual, you lose the deduction on the portion above that cap. I had a borrower in the Bay Area a few years back who was genuinely surprised to learn she couldn’t deduct interest on her full loan balance. Nobody told her.

Your lender will send you a Form 1098 each January showing exactly how much mortgage interest you paid. That’s the number you’d carry to Schedule A. Keep it somewhere you won’t lose it by March.

Property Taxes: Yes, But There’s a Ceiling

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You can deduct state and local taxes (called SALT), which includes property taxes, but the TCJA capped that deduction at $10,000 per year ($5,000 if married filing separately). If you own in New Jersey, Connecticut, New York, California, or Illinois, where property tax bills can easily run $12,000 to $25,000 a year, you’re leaving real money on the table above that cap. The CFPB’s homeownership resources lay this out clearly if you want more background.

The scenario where itemizing makes the most sense usually looks like this: you have a large mortgage (high interest payments in the early years), high property taxes, and possibly significant charitable contributions or unreimbursed medical expenses that stack up enough to beat the standard deduction. Otherwise? You take the standard deduction, and the house made no difference to your federal return that year.

A Comparison Table: Itemizing vs. Standard Deduction

This is the thing nobody walks you through. Here’s how the math can play out for three different buyer profiles, as of 2026. All figures are rough illustrations, not guarantees, and your situation will differ.

That third row is real life for a huge number of buyers, especially outside major coastal metros. Their house has zero effect on their federal tax return compared to renting.

Mortgage Points and PMI: The Deductions People Forget

If you paid discount points at closing to buy down your interest rate, those points are generally deductible, either in full the year you paid them (for a primary home purchase) or spread over the loan’s life (for a refinance). I made the mistake my first year of forgetting to ask borrowers about this. It’s not enormous money, but on a $300,000 loan where you paid 1 point ($3,000), that deduction is real.

Private mortgage insurance (PMI) deductibility has been in limbo for years, periodically expiring and being reinstated by Congress. As of August 2026, I’d strongly encourage you to verify current PMI deductibility status with a tax professional, because this is exactly the kind of thing that changes year to year without much fanfare. Freddie Mac’s homebuyer resources are a good starting point, but for anything tax-specific, you want a CPA who works with homeowners regularly.

The Capital Gains Exclusion (This One’s Actually Excellent)

This is the part I wish more buyers focused on, because it’s genuinely favorable. When you sell your primary home, you can exclude up to $250,000 of profit from capital gains taxes if you’re single, or $500,000 if you’re married filing jointly. The rules: you must have owned the home and used it as your primary residence for at least two of the five years before the sale.

A worked example: A couple buys a home in 2020 for $400,000. They sell it in 2026 for $680,000, a gain of $280,000. Because they’re married and have lived there the full period, they exclude up to $500,000. Their taxable capital gain is zero. Without this exclusion, they’d owe capital gains tax on $280,000, potentially tens of thousands of dollars.

Another scenario: A single buyer purchased in 2022 for $310,000, sells in 2026 for $540,000. Gain of $230,000. Under the $250,000 single-filer exclusion, the full gain is excluded. No capital gains tax owed.

This exclusion doesn’t require itemizing. It doesn’t compete with the standard deduction. You claim it on Form 8949 and Schedule D, and as long as you meet the residency test, it applies. This is, in my honest experience, the most underappreciated tax benefit of owning a home.

Home Office and Rental Space

Two situations that complicate things: if you work from home and use part of your home exclusively and regularly for business, you may be able to deduct a proportional share of mortgage interest, utilities, and depreciation. But “exclusively” is the key word. The IRS isn’t lenient here. A guest room with a desk doesn’t qualify. A dedicated room used only for work, possibly. Run this by a tax professional before you claim it.

If you rent out part of your home, the tax picture changes significantly. Rental income is taxable, but you can deduct associated expenses proportionally. The allocation math is genuinely annoying. How many days was it rented vs. used personally? Which expenses are fully deductible vs. partially? If you’re doing this, you probably need a CPA, not just tax software.

Assumes first-year interest payments, standard amortization, interest savings calculated against standard deduction threshold. Individual results will vary.

Sources

• IRS Publication 936 (Home Mortgage Interest Deduction): Official IRS guidance on which interest is deductible and under what conditions.
• IRS Topic No. 701 (Sale of Your Home): Authoritative breakdown of the capital gains exclusion rules.
• Tax Policy Center, 2023 Itemizing Analysis: Data on share of filers who itemize post-TCJA (approximately 13%).
• Consumer Financial Protection Bureau, Owning a Home: SALT cap explanations and homeowner tax overview.
• Freddie Mac MyHome Resource Center: First-time buyer guidance including tax considerations.

Photo: RDNE Stock project via Pexels

This article is for educational purposes only and does not constitute financial or mortgage advice. Mortgage rates change daily and vary by lender, loan type, credit profile, and property details. Consult a HUD-approved housing counselor (find one at hud.gov) or licensed mortgage professional for guidance specific to your financial situation.

Recommended Resources

Disclosure: As an Amazon Associate, we earn a small commission from qualifying purchases at no extra cost to you. We only recommend products that genuinely support the topics covered in this article.

• First-Time Home Buyer: The Complete Playbook (~$18), The #1 Amazon bestseller in homebuying, covers down payment strategies, mortgage pre-approval, and avoiding rookie mistakes.
• 100 Questions Every First-Time Home Buyer Should Ask (~$17), Nearly a million copies sold, covers every question to ask your lender, agent, and inspector before signing anything.