Filing a U.S. federal income tax return isn’t mandatory for everyone. Most people must file if their gross income is above the IRS filing threshold for their filing status and age, or if they have specific triggers like at least $400 in net self-employment earnings. Even if you’re below the threshold, filing can still make sense to claim refundable credits or get back withheld taxes.
What a “tax return” means in the United States
In the U.S., an individual federal tax return (typically Form 1040) is how you report income for the year, claim deductions and credits, and reconcile what you already paid through withholding or estimated payments with what you actually owe. The end result is usually one of two things: you pay an additional amount with your return, or you receive a refund.
A key U.S. difference from many EU systems is that U.S. payroll withholding doesn’t always “finalize” your tax situation automatically. While withholding happens throughout the year, you often still need to file to settle up and, importantly, to claim many credits (some of which are refundable).
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The main rule: income thresholds (Tax Year 2025)
For many taxpayers, the simplest test is whether your gross income is at least the IRS filing requirement amount for your filing status and age.
Below are the IRS thresholds for people who are not dependents (Tax Year 2025, filed in 2026).
If you are under 65 (end of 2025)
- Single: file if gross income is $15,750 or more
- Head of household: file if gross income is $23,625 or more
- Married filing jointly: file if gross income is $31,500 or more (both spouses under 65)
- Married filing separately: file if gross income is $5 or more
- Qualifying surviving spouse: file if gross income is $31,500 or more
If you are 65 or older (end of 2025)
- Single: file if gross income is $17,550 or more
- Head of household: file if gross income is $25,625 or more
- Married filing jointly: file if gross income is $33,100 or more (one spouse 65+), or $34,700 or more (both spouses 65+)
- Married filing separately: file if gross income is $5 or more
- Qualifying surviving spouse: file if gross income is $33,100 or more
Why these numbers matter: for many people, these thresholds track the standard deduction amounts and related filing rules. If your gross income is under the threshold and you don’t have a “special circumstance” that triggers filing, you often won’t be required to file.
Filing is required even at low income in some situations
Income thresholds are only part of the story. Certain facts can create a filing requirement even if your income is relatively small.
Self-employment: the $400 rule
If you have net earnings from self-employment of more than $400, you generally must file a federal return. This catches many “side hustle” situations even when the total income feels modest—freelancing, gig work, babysitting, tutoring, delivery driving, selling services online, and similar independent work.
Example: You made $1,200 designing logos and had $700 of deductible expenses. Your net earnings are $500, which is over $400—so you generally have to file.
Married filing separately is a common “surprise”
If your filing status is married filing separately, the threshold is only $5. In practice, most people using that status should expect to file.
Other triggers that can apply
The IRS lists “other situations that require you to file,” beyond the basic thresholds. These can involve specific taxes, credits, or types of income. If anything about your year is unusual—multiple income sources, certain retirement distributions, marketplace health insurance credits, or complex family situations—it’s smart to use an official filing questionnaire rather than guessing.
Special rules for dependents (including students and teens)
If someone else can claim you as a dependent, the filing rules change. The IRS separates income into:
- Earned income: wages, salaries, tips, professional fees, and taxable scholarships/fellowship grants
- Unearned income: taxable interest, dividends, capital gain distributions, unemployment compensation, taxable Social Security benefits, pensions/annuities, and certain trust distributions
Dependent filing triggers (Tax Year 2025)
A dependent may need to file if any of the IRS tests apply. Common triggers include:
- Unearned income over $1,350 (for many dependents)
- Earned income over $15,750 (for many dependents)
The IRS also uses combined tests based on gross income (earned + unearned) that depend on age, marital status, and whether the dependent is blind.
A practical teen example
Say a 17-year-old worked part-time and earned $3,000 and had $120 of federal income tax withheld from paychecks. They may not be required to file based on the earned-income threshold, but filing could still be the only way to get that $120 refunded.
Tips and gig work still count
Being under 18 doesn’t exempt someone from filing. Cash income is still income, and self-employment net earnings over $400 can trigger a filing requirement even for minors.
When you might not have to file (common scenarios)
Many taxpayers don’t have to file when their income is below the threshold and they don’t have special circumstances.
W-2 employee with low income and no complications
If you’re single, under 65, had only W-2 wages, and your gross income is below $15,750 for 2025, you may not be required to file.
But be careful: not required doesn’t always mean “no benefit” (more on that below).
Some Social Security-only situations
In many cases, if your only income is Social Security benefits, you won’t need to file a federal return. However, Social Security can become taxable depending on your “combined income,” and some people end up needing to file when they have Social Security plus other income—including tax-exempt interest.
The Social Security Administration notes that you may pay taxes on up to 85% of benefits depending on your combined income and filing status.
Reasons to file even if you don’t have to
A large number of people benefit from filing even when the IRS doesn’t strictly require it.
1) To get a refund of withholding
The IRS does not automatically send refunds if you don’t file. If federal income tax was withheld from your paycheck, filing may be the only way to get it back.
Example: You earned $2,500 at a job and had $300 withheld. If you owe $0 because your income is low, filing could bring back the $300.
2) To claim refundable credits
Some credits can put money in your pocket even if you owe no tax (or very little). If you qualify, filing is how you claim them.
3) To recover estimated payments
If you made estimated tax payments during the year—common for freelancers—you may need to file to reconcile and potentially get a refund if you overpaid.
Step-by-step: how to decide whether you must file
You don’t have to rely on rules of thumb. Use a structured approach:
Step 1: Identify your filing status and age
Filing status (single, head of household, married filing jointly/separately, qualifying surviving spouse) changes the threshold. Age matters because thresholds rise for many people 65+.
Step 2: Calculate gross income (not just take-home pay)
“Gross income” is broader than your paycheck net after deductions. Include wages, tips, taxable interest/dividends, unemployment, certain taxable scholarships, and other taxable income.
Step 3: Check for automatic filing triggers
Ask: – Did I have more than $400 in net self-employment earnings? – Am I married filing separately? – Can someone claim me as a dependent (and did I cross dependent thresholds)?
Step 4: Use an official questionnaire if anything is unclear
If you’re still unsure, the IRS provides an online interview-style tool to help determine whether you need to file.
Common “gray areas” that trip people up
Even when your income seems straightforward, these issues often change the answer.
Multiple jobs during the year
Having two W-2 jobs doesn’t automatically mean you must file if you’re under the threshold, but it increases the chance that withholding doesn’t match what you ultimately owe (especially if income crosses brackets). It also makes recordkeeping more error-prone.
Side income that feels “small”
Small freelance work can trigger filing because of the $400 net self-employment rule. People often focus on total cash received and forget to compute net profit (income minus expenses) the way the tax rules require.
Social Security plus “tax-exempt” interest
Tax-exempt municipal bond interest may still matter because it can affect whether Social Security benefits become taxable. That’s a classic example of something that feels like it should be irrelevant but isn’t.
U.S. vs EU context (only where it helps)
In much of the EU, payroll withholding and annual reconciliation can be more centralized, and in some countries many employees don’t file annually unless they have additional income. In the U.S., annual filing is more routine—even for standard employees—because the return is the mechanism to claim many credits and reconcile withholding, and because filing requirements vary by filing status and household circumstances.
If you moved to the U.S. from an EU country, don’t assume that “tax was withheld, so I’m done.” In the U.S., filing is often the step that unlocks refunds and credits.
Quick checklist: do you likely need to file?
You likely must file a federal return for 2025 if any of these are true:
- Your gross income meets or exceeds the IRS threshold for your filing status and age
- You had more than $400 in net self-employment earnings
- You are married filing separately and had $5+ in gross income
- You are a dependent and your earned/unearned income crosses dependent thresholds
You may want to file even if you don’t have to if:
- Federal income tax was withheld from your pay
- You qualify for refundable tax credits
- You made estimated payments and want to reconcile them
Sources
- Check if you need to file a tax return — https://www.irs.gov/individuals/check-if-you-need-to-file-a-tax-return
- How Much Do You Have to Make to File Taxes? — https://turbotax.intuit.com/tax-tips/irs-tax-return/does-everyone-need-to-file-an-income-tax-return/L7pluHkoW
- Find out if you need to file a federal tax return — https://www.usa.gov/who-needs-to-file-taxes
- How Much Do You Have to Make to File Taxes in 2025? — https://www.hrblock.com/tax-center/income/other-income/how-much-do-you-have-to-make-to-file-taxes/?srsltid=AfmBOopsWlAotlWdbEAyzLt7v2oMJJ_6_pVKVXPW_QMMVNOB1SOkI9x8
- How much do you have to make to file taxes in 2025? — https://www.jacksonhewitt.com/tax-help/tax-tips-topics/filing-your-taxes/how-much-do-you-have-to-make-to-file-taxes/
- Tax filing requirement – Glossary | HealthCare.gov — https://www.healthcare.gov/glossary/tax-filing-requirement/
- Must I pay taxes on Social Security benefits? — https://www.ssa.gov/faqs/en/questions/KA-02471.html
- Does Your Teen Need to File Taxes for Their Part-time Job? — https://www.eztaxreturn.com/blog/teens-taxes-does-your-teen-need-to-file-taxes-for-their-part-time-job/
Robert
I’m interested in technology and history, especially true crime stories. For three years I ran a fact-based portal about modern history, and for a year I co-built a blogging platform where I published dozens of analytical articles. I founded offpitch so that quality content wouldn’t be hidden behind a paywall.
