In 2025, roughly 161 million individual tax returns were processed by the IRS. [1] But millions more Americans earned income and chose not to file, either because they weren't required to, or because they didn't realize they were. The difference between those two groups is a specific dollar amount that changes every year and depends on your filing status, age, and how you earn your money.
For the 2025 tax year (returns filed in 2026), the magic number for a single filer under 65 is $15,750 in gross income. Below that, you're generally off the hook. Above it, you must file. But the story has a few more chapters than that.
30-Second Summary: You must file a 2025 federal tax return if your gross income exceeds $15,750 (single, under 65), $31,500 (married filing jointly, both under 65), or $23,625 (head of household, under 65). Self-employed workers must file at just $400 in net earnings. Even if you're below the threshold, filing can get you a refund.
2025 Filing Thresholds by Status and Age
These numbers apply to the 2025 tax year, for returns filed by April 15, 2026. [2]
| Filing Status | Under 65 | 65 or Older |
|---|
| Single | $15,750 | $17,750 |
| Married filing jointly (both under 65) | $31,500 | — |
| Married filing jointly (one 65+) | — | $33,100 |
| Married filing jointly (both 65+) | — | $34,700 |
| Head of household | $23,625 | $25,625 |
| Married filing separately | $5 | $5 |
| Qualifying surviving spouse | $31,500 | $33,100 |
These thresholds align closely with the standard deduction amounts. That's by design: if your income doesn't exceed the standard deduction, your taxable income is zero and you owe nothing. [3]
The 65-and-older thresholds are higher because seniors get an additional standard deduction. And there's a new bonus: for tax years 2025 through 2028, an extra $6,000 deduction is available to seniors with modified AGI under $75,000 (single) or $150,000 (married filing jointly). [4]
For the complete picture of who must file (including special situations like ACA credits, HSA distributions, and household employment taxes), see who has to file taxes.
The $400 Self-Employment Rule
This one catches people off guard. If your net self-employment income is $400 or more, you must file a federal tax return, regardless of total income. [5]
Net self-employment income means revenue minus business expenses. Drove for DoorDash and earned $2,000 but spent $1,500 on gas and car expenses? Your net is $500, which exceeds $400. You file.
The reason: self-employment tax (Social Security + Medicare at 15.3%) kicks in at $400. The government wants to collect it.
Example: Carlos, age 22, college student
- Part-time campus job: $3,200 (W-2 wages)
- Freelance tutoring: $550 net self-employment income
- Total income: $3,750
Carlos is well below the $15,750 single threshold. But his $550 in self-employment income exceeds $400. He must file.
His approximate self-employment tax: $550 × 15.3% = $84.15. Not a huge amount, but the IRS still wants the return. (And honestly, Carlos should file anyway to get back any withheld federal tax from his campus job.)
Dependent Filing Thresholds
Dependents (typically children or college students claimed on a parent's return) have their own, often lower, thresholds.
Dependents who are single, under 65 (2025 tax year):
| Income Type | Filing Trigger |
|---|
| Unearned income only | Over $1,350 |
| Earned income only | Over $15,750 |
| Both earned + unearned | More than the larger of $1,350 or (earned income up to $15,300 + $450) |
The unearned income trigger ($1,350) is the one that surprises parents. If a teenager has a custodial brokerage account at Schwab throwing off $1,500 in dividends, that child needs to file, even with zero wages.
Should You File Even If You Don't Have To?
Yes. In many cases, filing when you're not required to is literally how you get money.
Get Withheld Taxes Back
Example: Mia, age 20, single, $10,000 in W-2 wages, $500 withheld
Mia's income ($10,000) is below the $15,750 threshold. She's not required to file. But her employer withheld $500 in federal taxes. Since she'll owe $0 in tax (her standard deduction wipes out all taxable income), filing gets her a $500 refund.
Skip filing, and that $500 stays with the IRS. Forever.
Claim Refundable Tax Credits
Some credits pay you even when your tax bill is zero.
| Credit | Maximum Amount | Refundable? |
|---|
| Earned Income Tax Credit | Up to $8,046 (3+ kids) | Yes, fully |
| Child Tax Credit (refundable portion) | Up to $1,700 per child | Partially |
| American Opportunity Credit | Up to $1,000 | Partially (40%) |
Example: Keisha, age 27, single parent, $14,000 wages, one child
Keisha's $14,000 income is below the $23,625 head-of-household threshold. She's not required to file. But if she does:
- Potential EITC with one child: roughly $3,700 [6]
- Refundable CTC: up to $1,700
She could receive over five thousand dollars by filing a return on income that doesn't even require one. Not filing costs her thousands.
Other Reasons to File
- Loan applications. Mortgage lenders want to see recent returns. Try getting approved without them.
- Statute of limitations. The IRS has three years to audit a filed return. Unfiled? No time limit.
- Prevent fraud. Filing claims your Social Security number for that year, blocking scammers from filing in your name.
Seniors and Social Security
A common question: do seniors on Social Security need to file?
If Social Security is your only income, you typically don't need to file. Social Security benefits become partially taxable only when your "combined income" (AGI + nontaxable interest + half of Social Security) exceeds $25,000 (single) or $32,000 (married filing jointly).
A retired couple receiving $22,000 in Social Security and nothing else? No filing requirement.
But add $15,000 in pension income, and you've crossed a threshold. Tax gets complicated fast when multiple income sources enter the picture. The safest move is to run the numbers, or have someone run them for you.
Your Next Move
- Add up all your 2025 income. Wages, freelance pay, interest, dividends, pensions, everything.
- Check the threshold table for your filing status and age. Above the number? File.
- Had any self-employment income over $400? File, even if total income is low.
- Below the threshold? Check if federal tax was withheld (W-2, box 2) or if you qualify for refundable credits. If yes, file anyway.
- Use the IRS "Do I Need to File?" tool for a personalized determination.
- Run your numbers on our tax bracket calculator to see what you'd owe (or get back).
For context on how federal income tax brackets work and how deductions reduce your taxable income, those guides walk through the math step by step.
References
- IRS. (2025). Filing Season Statistics for Week Ending Dec. 26, 2025. https://www.irs.gov/newsroom/filing-season-statistics-for-week-ending-dec-26-2025
- IRS. (n.d.). Check If You Need to File a Tax Return. https://www.irs.gov/individuals/check-if-you-need-to-file-a-tax-return
- IRS. (n.d.). Topic No. 551, Standard Deduction. https://www.irs.gov/taxtopics/tc551
- IRS. (2025). One Big Beautiful Bill Act: Tax Deductions for Working Americans and Seniors. https://www.irs.gov/newsroom/one-big-beautiful-bill-act-tax-deductions-for-working-americans-and-seniors
- IRS. (n.d.). Self-Employment Tax. https://www.irs.gov/businesses/small-businesses-self-employed/self-employment-tax-social-security-and-medicare-taxes
- IRS. (n.d.). Earned Income Tax Credit. https://www.irs.gov/credits-deductions/individuals/earned-income-tax-credit-eitc
