So you and your partner bought a house together. Congrats. That’s a big step—emotionally and financially. But here’s the thing: if you’re not married, the IRS doesn’t see you as a “we.” It sees two separate individuals, each with their own tax bill. And that changes everything.
Honestly, it’s one of those topics that flies under the radar until tax season hits. Then you’re staring at a 1098 form, wondering why your mortgage interest deduction is suddenly a headache. Let’s untangle this, piece by piece.
Why Marriage Matters (Even When You Don’t Want It To)
For married couples filing jointly, the IRS offers a neat package: shared deductions, capital gains exclusions, and simpler reporting. Unmarried co-owners? You don’t get that. You’re essentially business partners in the eyes of the tax code. That’s not a bad thing—it just means you need a different playbook.
The biggest shocker? The $250,000 capital gains exclusion (or $500,000 for married couples) on a primary residence. For unmarried owners, each person gets their own $250,000 slice—but only if they both meet the ownership and use tests. Miss one, and you’re on the hook for taxes.
Ownership Structures: The Foundation of Your Strategy
First things first—how do you actually own the property? This isn’t just legal jargon. It dictates your tax strategy from day one.
- Tenancy in Common (TIC): You each own a specific percentage—say 50/50 or 60/40. You can sell your share independently. Tax deductions follow your ownership percentage.
- Joint Tenancy with Right of Survivorship: Equal shares, and if one dies, the other inherits automatically. Tax-wise, it’s similar to TIC, but with estate planning quirks.
- LLC or Partnership: You form a legal entity to hold the title. More paperwork, but it offers liability protection and flexible profit-sharing.
Most unmarried couples default to TIC. It’s simple. But here’s the catch: you can’t just split deductions however you want. The IRS expects you to claim them proportionally based on ownership interest.
Mortgage Interest Deductions: Splitting the Pie
Let’s say you both took out a joint mortgage. You each paid $6,000 in interest last year. The IRS allows you to deduct that—but only if you itemize. And here’s where it gets tricky: you can’t both claim the same $6,000. You each claim your own share.
If you’re both on the mortgage and both on the title, you can split the deduction based on who actually paid. But if only one person’s name is on the loan? That person gets the full deduction—even if you both live there. Yeah, it’s a little unfair. But that’s the rule.
Pro tip: If one partner has a higher income, consider having that person pay more of the mortgage interest. They’ll get a bigger tax break. Just make sure you document it—the IRS loves paper trails.
Property Taxes: Same Story, Different Form
Property taxes work the same way. If you both own the house, you split the deduction. But here’s a nuance: you can only deduct up to $10,000 in state and local taxes (SALT) per person. For married couples filing jointly, that cap is $10,000 total. So unmarried couples actually have an advantage here—you each get your own $10,000 limit.
That’s a rare win. Savor it.
When You Sell: The Capital Gains Dance
This is where most people get blindsided. You sell the house for a profit. You think, “Hey, we made $100,000—tax-free, right?” Not so fast.
To exclude up to $250,000 of gain, you need to meet two tests:
- Ownership test: You must have owned the home for at least two of the last five years.
- Use test: You must have lived in it as your primary residence for at least two of the last five years.
If both of you qualify, you each get your own $250,000 exclusion. That’s a combined $500,000—same as a married couple. But if one of you doesn’t meet the tests (say, you moved in later or your name isn’t on the title), that person might owe tax on their share of the gain.
And here’s a real-world scenario: you break up and one person wants to sell. The other doesn’t. The one who stays might not meet the use test if they move out later. Suddenly, a breakup becomes a tax problem.
Rental Property? Different Beast
If you’re co-owning a rental property, things get even more layered. You can deduct expenses like repairs, depreciation, and management fees. But you have to report rental income and expenses on your individual tax returns, proportional to your ownership.
Depreciation is a big one. It reduces your taxable income now, but when you sell, you’ll face “depreciation recapture”—taxed at a flat 25% rate. Unmarried couples need to track this carefully, because if one partner sells their share, they trigger recapture on their portion.
Strategies That Actually Work
Alright, let’s get practical. You need a game plan. Here are a few strategies that unmarried couples use—and they’re not all complicated.
1. The “Pay-As-You-Go” Agreement
Write a simple co-ownership agreement that spells out who pays what—mortgage, taxes, insurance, repairs. This isn’t just for lawyers. It’s your proof if the IRS ever asks. Include a clause about how you’ll split deductions. It doesn’t have to be 50/50. It can be 70/30, if that reflects reality.
2. Strategic Filing Status
You can’t file jointly, but you can coordinate your itemized deductions. If one partner has a lower income, they might benefit more from itemizing. The other can take the standard deduction. It’s not cheating—it’s smart math.
3. Use a Trust or LLC for Flexibility
If you’re serious about the property—especially a rental—consider an LLC. You can allocate income and deductions differently than ownership percentages. Just be ready for extra accounting costs. It’s not for everyone, but it gives you options.
4. Plan for the “What Ifs”
What if one of you dies? What if you split up? These aren’t fun conversations, but they’re essential. A buy-sell agreement can outline how the property gets sold or transferred, and what happens to the tax liability. It’s like a prenup for your house.
A Quick Table to Compare Scenarios
| Scenario | Married Couple | Unmarried Couple |
|---|---|---|
| Capital gains exclusion | $500,000 (joint) | $250,000 each (if both qualify) |
| SALT deduction cap | $10,000 total | $10,000 each |
| Mortgage interest deduction | Joint (up to $750k debt) | Split by ownership/payment |
| Filing status | Joint or separate | Single or head of household |
| Estate tax on death | Unlimited marital deduction | No automatic deduction |
See the pattern? Unmarried couples get some breaks (hello, SALT cap) but lose others (no marital deduction). It’s a trade-off.
The Hidden Trap: Gift Tax and Transfers
One partner wants to buy out the other. Or you want to add your partner to the title. Sounds simple, right? Not quite. Transferring ownership can trigger gift tax if the value exceeds $18,000 (as of 2024) per year. And that’s per person, per year.
Say your partner’s share is worth $100,000. If you give them that share, you’ve made a gift. You’ll need to file a gift tax return (Form 709). You probably won’t owe tax—thanks to the lifetime exemption—but it’s a hassle. And it eats into your estate tax exemption.
Better approach? Sell the share at fair market value. Or structure it as a loan. Just don’t assume you can hand over ownership for free.
One Last Thing—Documentation
I can’t stress this enough: keep records. Save bank statements, receipts, and your co-ownership agreement. The IRS doesn’t care about your relationship status—it cares about who paid what. If you can’t prove it, you lose the deduction.
And if you’re ever audited? That piece of paper could save you thousands.
The Takeaway
Co-owning real estate as an unmarried couple isn’t a tax nightmare—it’s just a different puzzle. You have to think individually, not as a unit. You have to plan for exits and deaths and breakups. But with a little foresight, you can make the tax code work for you, not against you.
Honestly, it’s a bit like building a house together. You need a solid foundation, clear blueprints, and a willingness to adjust when things shift. The tax part? That’s just another room in the house.
Key takeaway: Know your ownership structure, split deductions proportionally, and always—always—document your payments. The IRS might not care about your love story, but it respects a good paper trail.
[Meta title: Tax Strategies for Unmarried Couples