You can claim an unmarried partner as a dependent on your federal return if your partner passes every test the IRS uses for a “qualifying relative.” For the 2025 tax year, that means their gross income must be below $5,200, you must have provided more than half of their support, and they must have lived with you all year as a member of your household. The payoff is modest: a $500 nonrefundable Credit for Other Dependents, not the larger child-related credits.
The Five Tests Your Partner Has to Pass
The IRS sorts dependents into two categories: qualifying child and qualifying relative. An unmarried partner can only fit under qualifying relative. Under federal tax law, an unrelated person who shares your home as a member of your household can meet the relationship test.1Office of the Law Revision Counsel. 26 USC 152 – Dependent Defined All five of these have to be true:
- Your partner isn’t anyone else’s qualifying child for the year.
- Your partner lived with you the entire year as a member of your household, and the arrangement doesn’t violate local law.
- Your partner’s gross income for the year is below the annual limit — $5,200 for 2025. The IRS adjusts this each year for inflation.2Internal Revenue Service. Revenue Procedure 2024-40
- You provided more than half of your partner’s total financial support for the year.
- Your partner is a U.S. citizen, U.S. national, U.S. resident alien, or a resident of Canada or Mexico.3Internal Revenue Service. Dependents
One more rule sits alongside the five: if your partner is married, they generally can’t file a joint return with their spouse. The only exception is a joint return filed solely to claim a refund of withheld tax, where neither spouse would owe anything on separate returns.4Internal Revenue Service. Understanding Taxes – Dependents
How the Support Test Actually Works
This is where most partner claims stand or fall. You need to show you personally paid more than half of your partner’s total support for the calendar year. Total support covers food, housing, clothing, medical and dental care, education, transportation, and recreation.5Internal Revenue Service. Publication 501 – Dependents, Standard Deduction, and Filing Information
Housing is usually the biggest number in the calculation, and the IRS doesn’t want your mortgage payment or your rent. It wants fair rental value: what a stranger would reasonably pay for similar housing in your area, including a reasonable allowance for furniture, appliances, and utilities. If your partner has the run of your entire home, you’d apportion a share of the full fair rental value. If they use only a room, use the fair rental value of that room.5Internal Revenue Service. Publication 501 – Dependents, Standard Deduction, and Filing Information
Shared costs like groceries get divided among everyone in the home. If three people live together and you buy all the food, only a third of that bill counts as support for your partner. Health insurance premiums you pay for your partner count too. The test is straightforward once the numbers are on paper: add every dollar spent on your partner from every source, including their own spending on themselves, and confirm your share is more than half.
What Counts Toward the Gross Income Limit
Gross income for this test means income that isn’t tax-exempt. Wages, self-employment earnings, interest, dividends, rental income, and taxable portions of retirement distributions all count. Non-taxable Social Security benefits and welfare payments do not.6Internal Revenue Service. Understanding Taxes – Module 4 Dependents
The Social Security carve-out matters. If your partner receives $15,000 in Social Security and none of it is taxable — common when Social Security is their only income — that $15,000 doesn’t push them over the $5,200 limit. Their other taxable income is what has to stay under the line.
Living Together All Year
Your partner has to live with you the entire year as a member of your household. Short separations don’t break the claim if they’re temporary absences. The IRS treats absences as temporary when they’re for illness, education, business, vacation, or military service, and it’s reasonable to expect the person to return afterward.7Internal Revenue Service. Temporary Absence
The arrangement also can’t violate local law.8Internal Revenue Service. Understanding Taxes – Module 4 Dependents A few states historically had statutes against unmarried cohabitation. Most have been repealed and enforcement was virtually nonexistent before repeal, but if one is still on the books where you live, it could technically bar the claim.
What You Get — and What You Don’t
Claiming your partner as a qualifying relative gets you the Credit for Other Dependents, worth up to $500. The credit phases out once your adjusted gross income passes $200,000, or $400,000 if you’re married filing jointly.9Internal Revenue Service. Child Tax Credit
The credit is nonrefundable, so it reduces tax you owe but won’t create a refund on its own. If your tax liability is $300, the credit is worth $300, not $500. You calculate it on Schedule 8812, and the amount flows to Form 1040, line 19.10Internal Revenue Service. Schedule 8812 (Form 1040)
Now the boundaries. Claiming an unmarried partner does not qualify you for head of household filing status. Publication 501 spells this out directly: a friend who lives with you all year and meets every qualifying relative test still does not make you eligible for head of household.5Internal Revenue Service. Publication 501 – Dependents, Standard Deduction, and Filing Information The same rule applies to a partner. You also won’t qualify for the Child Tax Credit, which requires a qualifying child under 17, and a qualifying relative doesn’t help with the Earned Income Tax Credit. The practical benefit is $500 and nothing more.
How to Claim Your Partner on Form 1040
In the Dependents section on page 1, enter your partner’s full name, Social Security Number or ITIN, and their relationship to you. “None” is acceptable in the relationship column for an unrelated household member. Check the box for Credit for Other Dependents so the $500 credit gets applied.11Internal Revenue Service. Instructions for Schedule 8812 (Form 1040)
If your partner doesn’t have a Social Security Number, they can apply for an ITIN using Form W-7. An ITIN is a nine-digit number the IRS issues to people who need a taxpayer identification number but aren’t eligible for an SSN.12Internal Revenue Service. About Form W-7, Application for IRS Individual Taxpayer Identification Number Verify every digit; one wrong number can delay the return or trigger a rejection of the dependent claim.
Records to Keep in Case the IRS Asks
Nothing gets submitted with an e-filed return, but if the claim is questioned later, you’ll need to back up each element. Keep:
- Proof of residency — shared lease, utility bills, mail at the same address, or other documents showing your partner lived at your address the full year.
- Proof of your partner’s income — W-2s, 1099s, or other statements showing gross income stayed under the limit.
- Proof of support you provided — a category-by-category breakdown of what was spent on your partner, including a fair rental value calculation for lodging based on comparable listings in your area.
The support calculation is what auditors look at hardest. A rough estimate won’t hold up. A spreadsheet listing every category, the total from all sources, and your specific share is what you want to have ready.
Penalties for Getting the Claim Wrong
Claiming a dependent you’re not entitled to isn’t treated as a harmless mistake. If the error comes from negligence or carelessness, the IRS can assess an accuracy-related penalty of 20% of the underpaid tax.13Internal Revenue Service. Accuracy-Related Penalty Interest runs on the underpayment and the penalty until you pay in full.
It gets worse if the IRS decides you acted recklessly or intentionally disregarded the rules: a two-year ban on claiming the Credit for Other Dependents. A fraudulent claim brings a ten-year ban.14Taxpayer Advocate Service. Erroneously Claiming Certain Refundable Tax Credits Could Lead to Being Banned From Claiming the Credits The line between an honest mistake and recklessness usually comes down to whether you made a real effort to verify eligibility before filing. The documentation above is the simplest way to show that effort.