To file a federal tax return, you gather your income documents, complete Form 1040 (on paper or, more commonly, through tax software), claim any deductions and credits you qualify for, and submit the finished return to the IRS by April 15 along with payment for any balance due. Most people now file electronically because it is faster, the software catches math errors, and refunds arrive in under three weeks with direct deposit. Learning how to file a federal tax return comes down to five steps: confirming you have to file, gathering your paperwork, filling in Form 1040, choosing a submission method, and settling up any refund or balance.
Confirm You Actually Have to File
Whether you must file depends on your gross income, filing status, and age. For the 2025 tax year (the return due in April 2026), the thresholds are:1Internal Revenue Service. Check if you need to file a tax return
- Single, under 65: $15,750
- Single, 65 or older: $17,550
- Head of household, under 65: $23,625
- Married filing jointly, both under 65: $31,500
- Married filing jointly, one spouse 65 or older: $33,100
- Married filing separately: $5
- Qualifying surviving spouse, under 65: $31,500
Self-employment has its own trigger. If your net self-employment earnings reach $400, you must file no matter what your total income is, because the return is how the IRS collects Social Security and Medicare taxes on that income. The combined self-employment tax rate is 15.3%.2Internal Revenue Service. Self-employment tax (Social Security and Medicare taxes)
File anyway if you’re below the threshold but had federal tax withheld from a paycheck, or if you qualify for a refundable credit like the Earned Income Tax Credit, Child Tax Credit, or American Opportunity Tax Credit.3Internal Revenue Service. Who needs to file a tax return Without a return, that money stays with the government.
Know the Deadline
The 2025 return is due April 15, 2026.4Internal Revenue Service. IRS opens 2026 filing season If you need more time, filing Form 4868 by April 15 buys you an automatic extension until October 15, 2026.5Internal Revenue Service. Due dates and extension dates for e-file
An extension gives you more time to file, not more time to pay. Any balance is still due April 15. If you expect to owe, send an estimated payment with your extension request; interest and penalties keep running on unpaid tax regardless of the extension.6Internal Revenue Service. Taxpayers should know that an extension to file is not an extension to pay taxes
Gather Your Documents
Before you open the software or the paper form, pull together everything that reports income or supports a deduction. You’ll be entering figures from:7Internal Revenue Service. Form 1040 (2025) U.S. Individual Income Tax Return
- W-2 forms from each employer
- 1099 forms for freelance work, bank interest, dividends, retirement distributions, and similar income
- Records of capital gains from selling investments
- Rental income and expense records
- Receipts or statements for deductible expenses if you plan to itemize (mortgage interest, state and local taxes, charitable contributions, medical bills)
- Last year’s return, useful for reference and for e-file identity verification
- Social Security numbers for you, your spouse, and any dependents
Employers and payers are required to send W-2 and 1099 forms by the end of January, so most filers have everything they need by early February.
Fill Out Form 1040
Form 1040 is the standard individual income tax return. Taxpayers age 65 and older can use Form 1040-SR instead; it uses larger type and includes a standard deduction chart but is otherwise identical.8Internal Revenue Service. About Form 1040, U.S. Individual Income Tax Return The form moves in a predictable order: identify yourself and your dependents, total up your income, subtract deductions, apply credits, and land on either a refund or a balance due.
Choose Between the Standard Deduction and Itemizing
After you total your income, you subtract a deduction. The standard deduction is a flat amount that requires no documentation. For tax year 2026, it’s $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household.9Internal Revenue Service. IRS releases tax inflation adjustments for tax year 2026, including amendments from the One, Big, Beautiful Bill
Filers 65 and older get an additional $6,000 deduction from 2025 through 2028 ($12,000 if both spouses on a joint return qualify), on top of the regular standard deduction and separate from the older additional deduction for seniors.10Internal Revenue Service. Check your eligibility for the new enhanced deduction for seniors
Itemizing means listing specific deductible expenses on Schedule A: mortgage interest, state and local taxes up to $10,000, medical costs above 7.5% of your adjusted gross income, and charitable gifts.11Internal Revenue Service. Deductions for individuals: The difference between standard and itemized deductions, and what they mean Only itemize if those totals beat the standard deduction for your filing status. Most filers don’t come out ahead itemizing, which is why the standard deduction is the default choice for the majority of returns.
Claim Every Credit You Qualify For
Credits reduce your tax bill dollar for dollar, and some are refundable, meaning they can generate a refund even if you owe no tax.12Internal Revenue Service. Tax credits for individuals The Child Tax Credit is worth up to $2,200 per qualifying child for tax year 2025.13Internal Revenue Service. Child Tax Credit The Earned Income Tax Credit is aimed at low- and moderate-income workers. Missed credits are one of the most common ways people leave money behind, so work through the credits section carefully rather than skimming it.
Submit the Return
Electronic filing is the fastest and most accurate route. You sign with a self-selected five-digit PIN, and the IRS sends confirmation once your return is accepted.14Internal Revenue Service. E-file: Do your taxes for free
If your adjusted gross income is $89,000 or less, IRS Free File gives you guided tax preparation software at no cost for your federal return.15Internal Revenue Service. 2026 tax filing season opens with several free filing options available Above that income level, you can use Free File Fillable Forms, which offers no guidance, or a paid commercial product like TurboTax, H&R Block, or TaxAct.
Paper filing still works. You mail the completed return to an IRS processing center, and the correct address depends on your state and whether you’re sending a payment with the return.16Internal Revenue Service. Where to file addresses for taxpayers and tax professionals filing Form 1040 or Form 1040-SR Sending it by certified mail gives you a dated receipt as proof of timely filing. Paper returns take much longer to process than e-filed ones.
Settle Up: Refund or Balance Due
If You’re Getting a Refund
E-filers who choose direct deposit typically receive refunds in less than 21 days. Paper returns take six weeks or more from the date the IRS receives them.17Internal Revenue Service. Refunds Returns claiming the Earned Income Tax Credit or the Additional Child Tax Credit can’t be paid out before mid-February by law, so those refunds always arrive later than others regardless of when you file.13Internal Revenue Service. Child Tax Credit
If You Owe
Payment is due April 15 even if you filed an extension. The IRS accepts payments through Direct Pay, the Electronic Federal Tax Payment System, debit or credit cards, or a paper check mailed with Form 1040-V.18Internal Revenue Service. Pay taxes on time If you can’t pay in full, the IRS offers installment agreements, though interest and penalties keep accruing until the balance is gone.
If You’re Late
Two separate penalties can apply, and they stack:
- Failure to file: 5% of unpaid taxes per month or partial month late, capped at 25%.19Internal Revenue Service. Failure to file penalty
- Failure to pay: 0.5% of unpaid taxes per month, also capped at 25%.20Internal Revenue Service. Failure to Pay Penalty
When both apply in a given month, the failure-to-file penalty is reduced by the failure-to-pay amount. Unpaid balances also carry interest at the federal short-term rate plus three percentage points, recalculated quarterly.21eCFR. 26 CFR 301.6621-3 – Higher interest rate payable on large corporate underpayments The practical rule: if you can’t pay, file anyway. The failure-to-file penalty is ten times the failure-to-pay rate, so filing on time even without a payment cuts your damages sharply.
If You Made a Mistake
Errors in filing status, income, deductions, credits, or dependents get fixed by filing Form 1040-X.22Internal Revenue Service. File an amended return You don’t need to amend if the IRS catches a math error and corrects it, or if they simply ask for a missing form. To claim a refund through an amendment, you generally have three years from the original return’s due date or two years from the date you paid the tax, whichever is later. Amended returns can now be e-filed for the current and two prior tax years.