Who Must File a US Tax Return, and Why You Should Even If You Don't Have To
Who Is Required to File a Federal Tax Return and Special Situations Requiring Filing Regardless of Income
Not everybody has to file, and a good many people who do not have to should anyway.
Whether a return is required turns on income, filing status and age, plus a list of situations that require one regardless of income. Filing when you do not have to is how refundable credits and over-withheld tax actually reach you, and there is a limited window before that money is lost.
This covers who is required to file, the circumstances that create an obligation on their own, the reasons to file voluntarily, and the free routes available for doing it.
Who Is Required to File a Federal Tax Return?
Whether you must file depends on your gross income, filing status, age, and type of income. The IRS updates these thresholds annually for inflation.
| Filing Status / Situation | 2025 Gross Income Threshold (Must File If At Least) |
|---|---|
| Single, under 65 | $14,600 |
| Single, 65 or older | $16,550 |
| Married Filing Jointly, both under 65 | $29,200 |
| Married Filing Jointly, one spouse 65+ | $30,750 |
| Married Filing Jointly, both 65+ | $32,300 |
| Married Filing Separately (any age) | $5 |
| Head of Household, under 65 | $21,900 |
| Head of Household, 65+ | $23,850 |
| Self-employed net earnings | $400 (regardless of other income) |
| Dependent with unearned income over | $1,300 |
There is a limited window for claiming a refund by filing, and once it closes the money stays where it is whatever the circumstances. That is the practical reason to file even a very simple return for a low-income year: withholding or a refundable credit may be sitting there unclaimed.
Anu Gupta, CA, EA, B.Tech · LinkedInSpecial Situations Requiring Filing Regardless of Income
- You owe alternative minimum tax (AMT).
- You received distributions from an HSA, Archer MSA, or Medicare Advantage MSA.
- You had net earnings from self-employment of $400 or more.
- You received advance premium tax credits (ACA marketplace insurance subsidy).
- You received wages from a church or church-controlled organization exempt from employer FICA.
- You are a nonresident alien who earned US-sourced income.
Why You Should File Even If You Are Not Required To
1. Get a Refund of Withheld Taxes
If your employer withheld federal income tax from your paychecks, you cannot get that money back without filing a return. The IRS does not automatically send refunds, you must file to claim them.
2. Claim Refundable Tax Credits
Some credits are refundable, they put money in your pocket even if you owe zero tax:
- Earned Income Tax Credit (EITC): up to $7,830 (2025) for low-to-moderate income earners with qualifying children.
- Additional Child Tax Credit (ACTC): the refundable portion of the Child Tax Credit.
- American Opportunity Tax Credit (AOTC): up to $1,000 refundable for eligible college expenses.
- Premium Tax Credit (ACA subsidy reconciliation).
3. Recover Estimated Tax Payments
If you paid quarterly estimated taxes but ended up below the filing threshold, you need to file to get those payments back.
4. Start the Statute of Limitations
The IRS has 3 years from when you FILE your return to audit it. If you never file, the statute of limitations never starts, the IRS could technically assess tax indefinitely.
5. Build a Tax Filing History
Lenders (mortgages, car loans, business loans) often require 2-3 years of tax returns. Not having returns can disqualify you from financing. The SBA also requires tax returns for business loan applications.
6. Social Security Work Credits
Self-employed individuals who do not file do not get credit for those earnings in the Social Security system, which can reduce future retirement and disability benefits.
How to File for Free
- IRS Free File: free tax software for AGI under $79,000 (2025). Available at IRS.gov/freefile.
- IRS Direct File: available in some states, allows filing directly with IRS.
- VITA (Volunteer Income Tax Assistance): free in-person help for income under ~$67,000.
- Tax Aide (AARP): free help for taxpayers 50+.
Book a free consultation and we will take the return off your desk.
Frequently Asked Questions
What if I miss the filing deadline?
If you are owed a refund, there is no penalty for filing late, you simply delay receiving your refund. However, you have only 3 years from the original due date to claim the refund (after that, it is forfeited). If you owe tax, late filing triggers penalties.
Do I need to file a state return separately?
Yes. State and federal filing requirements are independent. Most states have their own income tax and their own filing thresholds. Nine states have no income tax: Alaska, Florida, Nevada, New Hampshire (interest/dividend tax only), South Dakota, Tennessee, Texas, Washington, Wyoming.
I am a dependent on my parents' return, do I have to file?
Possibly. Even if you are claimed as a dependent, you must file if your earned income exceeds $14,600 (2025) or your unearned income (dividends, interest) exceeds $1,300. Kiddie Tax rules may also apply to investment income of dependents under 19 (or full-time students under 24).
How do we work out whether a return is required in a given year?
By checking the current thresholds for your filing status and age against your income for that year, and then checking the separate situations that require a return regardless of income. The figures are adjusted annually, so take them from the authority's own guidance for the year in question rather than from last year's answer. Self-employment, certain credits and some account types each create a requirement on their own.
What happens to a refund that is never claimed?
It is lost after a limited period. There is a window for claiming a refund by filing, and once it closes the money stays with the government whatever the circumstances. This is the practical reason to file even a very simple return for a year with low income: withholding or a refundable credit may be sitting there, and only a filed return releases it.
Written by
Anu Gupta, CA, EA, B.Tech
Anu works with US businesses on tax and entity questions at Profitjets, from choosing a structure to the filings that follow it. She writes about the decisions owners make once and then live with for years. Connect on LinkedIn
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