To file your tax return for tax year 2025, gather your income documents, complete Form 1040, and submit it to the IRS electronically or by mail by April 15, 2026, paying any balance due the same day.1Internal Revenue Service. When to File The mechanics are the same whether you use free software, a paid preparer, or paper forms; what changes is how long processing takes and how much help you get along the way.
Do You Actually Have to File
Filing is required once your gross income crosses a threshold tied to your filing status and age. For tax year 2025, the floors are $15,750 for a single filer under 65, $17,550 at 65 or older, $31,500 for a married couple filing jointly (both under 65), $23,625 for a head of household under 65, and just $5 for anyone married filing separately.2Internal Revenue Service. Check if You Need to File a Tax Return The thresholds track the standard deduction, which is why they rise each year with inflation.
Two situations pull people back in even when their income is under the line. If federal tax was withheld from your paychecks or you qualify for a refundable credit like the Earned Income Tax Credit, filing is the only way to get that money back. And if you had $400 or more in net self-employment income, you must file regardless of the thresholds above, because self-employment tax is owed on that income.
What to Gather Before You Start
Every person listed on the return needs a Social Security number or an Individual Taxpayer Identification Number. A missing or incorrect number is one of the most common reasons returns get rejected.3Internal Revenue Service. Taxpayer Identification Numbers (TIN)
Income Statements
Employers send Form W-2 showing your wages and the federal, state, and payroll taxes withheld.4Internal Revenue Service. About Form W-2, Wage and Tax Statement Freelancers and contractors receive Form 1099-NEC from any client that paid them $600 or more.5Internal Revenue Service. About Form 1099-NEC, Nonemployee Compensation Other 1099 variants report interest (1099-INT), dividends (1099-DIV), and retirement distributions (1099-R). These forms are due to you by late January, so if something hasn’t arrived by mid-February, follow up with the issuer.
Deduction and Credit Documents
If you plan to itemize instead of taking the standard deduction, pull your records together early. Homeowners receive Form 1098 from the mortgage lender showing interest paid.6Internal Revenue Service. About Form 1098, Mortgage Interest Statement Charitable donations need receipts, and any gift of $250 or more requires a written acknowledgment from the organization. Medical expenses, state and local taxes, and casualty losses each have their own rules and dollar floors.
If you had marketplace health insurance with premium subsidies, watch for Form 1095-A in early February. You need it to complete Form 8962 and reconcile your Premium Tax Credit. Skip this step and the return can stall or draw an IRS notice.
Prior Payments
If you made quarterly estimated tax payments during the year, have those dates and amounts handy so you can credit them against your total liability on the return.
Completing Form 1040
Form 1040 is the main individual return, and every other document you gathered feeds into it. Transfer wage and nonwage income from your W-2s and 1099s onto the correct lines, then work down to adjusted gross income. From there you choose the standard deduction or itemize.
For tax year 2025, the standard deduction is $15,750 for single filers, $23,625 for heads of household, and $31,500 for married couples filing jointly.7Internal Revenue Service. How to Update Withholding to Account for Tax Law Changes for 2025 Taxpayers 65 or older add $2,000 (single or head of household) or $1,600 (married) on top of that.8Internal Revenue Service. Publication 554 (2025), Tax Guide for Seniors Getting every line right is the slowest part of the job, and it is what prevents the mismatches that trigger notices later.
How to Submit the Return
Electronic Filing
Most filers submit electronically, and the IRS pushes hard in that direction. If your adjusted gross income is $89,000 or less, IRS Free File gives you no-cost access to guided tax software from commercial providers.9Internal Revenue Service. E-file: Do Your Taxes for Free IRS Direct File is a newer option that lets eligible taxpayers file straight with the IRS without third-party software. Above the income limit or with a more complex return, commercial software and paid preparers both offer e-filing. Electronic returns get an immediate acknowledgment of receipt and typically finish processing in about three weeks.
Paper Filing
To mail a paper return, print Form 1040 with every schedule and attachment and send it to the IRS service center for your state; the correct address depends on where you live and whether you’re enclosing a payment.10Internal Revenue Service. Where to File Addresses for Taxpayers and Tax Professionals Filing Form 1040 Use certified mail with a return receipt so you can prove the postmark date. Paper returns take six weeks or more to process, so the refund arrives later too.
Paying What You Owe
If the return shows a balance due, pay it by April 15 to avoid penalties and interest. IRS Direct Pay pulls the money straight from your bank account for free. You can also pay by debit or credit card through an approved processor, though card payments carry convenience fees of roughly 1.75% to 1.85%, none of which goes to the IRS itself.11Internal Revenue Service. Pay Your Taxes by Debit or Credit Card or Digital Wallet Checks go in with Form 1040-V. If the balance is more than you can pay at once, apply for an IRS installment agreement rather than letting the debt sit.
If You Need More Time
Filing Form 4868 gives you an automatic six-month extension, pushing the filing deadline to October 15. You can submit it through tax software or IRS Free File.12Internal Revenue Service. Get an Extension to File Your Tax Return
Here is the part people miss every year: the extension buys time to file, not time to pay. Any tax you owe is still due on April 15. Miss that date and the IRS charges interest and the failure-to-pay penalty on the unpaid balance even though the return itself isn’t late. Estimate what you owe, pay that on April 15, and reconcile the exact number when you file in the fall. If you overpaid, the difference comes back as a refund.
What Late Filing and Late Payment Cost
The IRS charges separate penalties for filing late and paying late, and they run at the same time.
- Failure to file: 5% of the unpaid tax for each month or partial month the return is late, capped at 25%. If you’re more than 60 days past the deadline, the minimum penalty is the lesser of $525 or 100% of the tax due.13Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges
- Failure to pay: 0.5% of the unpaid tax per month, also capped at 25%. The rate drops to 0.25% per month if you have an installment agreement in place.14Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax
- Interest: compounded daily on any unpaid balance, at a rate set quarterly based on the federal short-term rate plus 3 percentage points. The individual underpayment rate for the first half of 2026 ranges from 6% to 7%.15Internal Revenue Service. Quarterly Interest Rates
The failure-to-file penalty runs at ten times the failure-to-pay rate, so if money is tight, file on time (or file the extension) and work out the payment separately.
Tracking the Return After You File
Once your return is in, the IRS “Where’s My Refund?” tool shows its status. You’ll need your Social Security number, filing status, and the exact whole-dollar refund amount from the return.16Internal Revenue Service. Refunds The IRS2Go mobile app does the same thing.
E-filers can check within 24 hours of the IRS acknowledging receipt. Paper filers need to wait about four weeks before the system shows anything.17Internal Revenue Service. Check the Status of a Refund in Just a Few Clicks Using the Where’s My Refund? Tool A hold flag doesn’t always mean trouble; the IRS pulls returns for reasons that range from math errors to identity checks.
Fixing a Return You Already Filed
If you find a missing 1099, a forgotten deduction, or the wrong filing status after submitting, Form 1040-X lets you correct the return. Most amended returns can now be filed electronically through tax software, though paper is still required for tax years 2021 and earlier.18Internal Revenue Service. File an Amended Return
You generally have three years from the date you filed the original return, or two years from when you paid the tax, whichever is later, to file an amended return claiming a refund. If you filed early, the clock starts on the April deadline rather than the day you actually sent the return. The IRS accepts up to three amended returns for the same tax year, and processing takes longer than an original filing.