Doing your taxes means reporting the income you earned last year to the IRS, calculating how much tax you owe on it, and then either paying the remaining balance or claiming a refund if too much was already withheld from your paychecks. The process breaks down into four steps: figuring out whether you need to file, gathering your income documents, filling out a tax return that applies deductions and credits, and submitting it to the IRS by the annual deadline. For most people, the whole thing is done online in a couple of hours using tax software. What follows is what each step actually involves.
Do You Even Have to File
Not everyone is legally required to file a return. Whether you have to depends on how much you earned, your age, and your filing status. For tax year 2025 (the return filed in 2026), a single filer under 65 doesn’t need to file unless they earned at least $15,750. Married couples filing jointly where both spouses are under 65 have a threshold of $31,500, and head of household filers have a threshold of $23,625.1Internal Revenue Service. Check If You Need to File a Tax Return
Self-employment has its own rule. If you earned more than $400 in net self-employment income, you have to file no matter what your total income was.1Internal Revenue Service. Check If You Need to File a Tax Return
Even if you’re below the threshold, filing is often worth it anyway. If your employer withheld federal tax from your paychecks, filing is the only way to get that money back. The same goes for refundable credits like the Earned Income Tax Credit, which the IRS will send you as a payment even if you owe no tax. Skip filing and you leave that money with the Treasury.
How the Tax Is Calculated
Federal income tax is progressive. Higher slices of your income get taxed at higher rates, and the rates climb in bands called brackets. For 2025, a single filer pays 10% on the first $11,925 of taxable income, 12% on the next chunk up to $48,475, 22% on the portion from there to $103,350, and so on up to 37% on income above $626,350.2Internal Revenue Service. Federal Income Tax Rates and Brackets
A lot of people misread how this works. Earning more doesn’t push your whole income into a higher bracket. Only the dollars above each threshold get the higher rate. Someone making $50,000 pays 10% on their first $11,925, 12% on the middle chunk, and 22% on just the narrow slice above $48,475. There’s no cliff where a raise costs you money.
The tax is calculated on your “taxable income,” which is your total income minus your deductions.3Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed Federal law defines income broadly. Wages, salaries, freelance earnings, business profits, interest, dividends, investment gains, and rental income all count, unless a specific rule excludes them.4Office of the Law Revision Counsel. 26 USC 61 – Gross Income Defined The tax year is the calendar year, January 1 through December 31, for most individuals.5Internal Revenue Service. Tax Years
What You Need Before You Start
You can’t fill out a return without the paperwork that documents what you earned and what was already withheld. Most of it arrives by early February, either in the mail or through an employer’s payroll portal.
If you worked as an employee, you’ll get a Form W-2 showing your wages and the federal, state, and payroll taxes taken from your paychecks.6Internal Revenue Service. About Form W-2, Wage and Tax Statement Freelancers and independent contractors get a Form 1099-NEC from each client that paid them $600 or more. Banks send a 1099-INT for interest, brokerages send a 1099-DIV for dividends, and a 1099-B if you sold investments.
You’ll also need your Social Security number and the Social Security numbers of anyone you plan to claim as a dependent. The IRS uses these to cross-check the income on your return against what employers and banks reported separately. People without a Social Security number can apply for an Individual Taxpayer Identification Number instead.7Internal Revenue Service. Taxpayer Identification Numbers (TIN)
Deductions and Credits: Lowering the Bill
The tax code gives you two tools to reduce what you owe. Deductions reduce the income you’re taxed on. Credits reduce the tax itself, dollar for dollar. The distinction matters. A $1,000 credit saves you $1,000. A $1,000 deduction saves you only $1,000 times your tax rate, which for most people works out to a couple hundred dollars.
Standard Deduction or Itemized
Every filer picks one of two paths. You can take the standard deduction, a flat amount set by law, or you can itemize by listing individual deductible expenses on Schedule A. For 2025, the standard deduction is $15,750 for single filers, $31,500 for married couples filing jointly, and $23,625 for heads of household.8Internal Revenue Service. Publication 501 (2025), Dependents, Standard Deduction, and Filing Information
Most people take the standard deduction because it’s simpler and, in practice, larger than what they’d get from itemizing. Itemizing pays off if your qualifying costs run higher than that flat amount. The big itemized categories are mortgage interest, state and local taxes (capped at $10,000), and medical costs that exceed 7.5% of your adjusted gross income.
Credits
Credits do the heavy lifting for a lot of households. The Child Tax Credit is worth up to $2,200 per qualifying child under 17 for 2025, with a portion refundable to families who owe little or no tax. The Earned Income Tax Credit, aimed at lower-income workers, is fully refundable and can be worth several thousand dollars for a family with children. Other credits cover education expenses, retirement contributions, and clean-energy home improvements. Tax software walks you through the eligibility questions for each one.
For the 2025 filing season, a new Schedule 1-A introduces deductions for qualifying tip income, overtime pay, car loan interest, and an enhanced deduction for seniors.9Internal Revenue Service. 1040 (2025) Instructions10Internal Revenue Service. How to Take Advantage of No Tax on Tips and Overtime If you earn tips or overtime, check the Schedule 1-A instructions before you file.
How You Actually Submit the Return
The document at the center of the process is Form 1040, the U.S. Individual Income Tax Return.11Internal Revenue Service. About Form 1040, U.S. Individual Income Tax Return You enter your wage income from your W-2, add interest and dividends from your 1099s, subtract your deduction to get your taxable income, calculate the tax using the bracket tables, apply any credits, and then compare the result against what was already withheld.9Internal Revenue Service. 1040 (2025) Instructions If more was withheld than you owe, you get a refund. If less, you owe the difference.
Almost everyone files electronically. E-filing sends your return straight to IRS systems and is faster and more accurate than paper.12Internal Revenue Service. Frequently Asked Questions for Electronic Filing (e-file) You sign the return electronically, usually by entering your prior-year adjusted gross income or an Identity Protection PIN from the IRS. Within a day or two, you find out whether the IRS accepted your return.
If your adjusted gross income is $89,000 or less, the IRS Free File program gives you guided tax software at no cost through eight partner companies. Anyone, regardless of income, can use Free File Fillable Forms, which are electronic versions of the paper forms without the guided interview.13Internal Revenue Service. 2026 Tax Filing Season Opens With Several Free Filing Options Available Paper filing is still allowed. You print the completed return and mail it to the address the IRS assigns based on your state and whether you’re enclosing a payment.14Internal Revenue Service. Where to File Paper Tax Returns With or Without a Payment Paper returns take substantially longer to process.
The Deadline and Extensions
For tax year 2025, the return and any tax owed are due by April 15, 2026.15Internal Revenue Service. IRS Announces First Day of 2026 Filing Season The deadline applies whether you expect a refund or owe money.
If you need more time, you can request an automatic six-month extension that pushes the filing deadline to October 15. You do it by paying online and checking the extension box, using IRS Free File to submit an extension request, or mailing Form 4868.16Internal Revenue Service. Get an Extension to File Your Tax Return
Here’s where people get burned. An extension gives you more time to file the paperwork, not more time to pay. Any tax you owe is still due April 15. File for an extension without paying and the IRS starts charging interest and penalties on the balance the day after the deadline.16Internal Revenue Service. Get an Extension to File Your Tax Return
After You File: Refund or Balance Due
If more was withheld than you owed, or credits pushed your tax below zero, the IRS sends the difference back. E-filers who choose direct deposit usually get their refund in about three weeks. Paper returns take six weeks or longer.17Internal Revenue Service. About Refunds You have three years from the original filing deadline to claim a refund. Miss that window and the money stays with the Treasury.
If you owe, you can pay by direct bank transfer, credit or debit card, or check with a payment voucher. Can’t pay all at once? The IRS offers payment plans instead of demanding a lump sum. A short-term plan gives you up to 180 days if you owe under $100,000. A long-term installment agreement lets you pay monthly if you owe $50,000 or less.18Internal Revenue Service. Payment Plans; Installment Agreements A payment plan doesn’t erase interest and late-payment penalties, but it cuts the penalty rate and keeps the IRS from escalating to liens or levies.
Penalties for Being Late
The IRS charges separate penalties for filing late and paying late, and they stack. The failure-to-file penalty is 5% of the unpaid tax per month, capped at 25%.19Internal Revenue Service. Failure to File Penalty If the return runs more than 60 days late, the minimum penalty is $525 or 100% of the tax owed, whichever is less.20Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges The failure-to-pay penalty is much gentler, at 0.5% of unpaid tax per month, and drops to 0.25% if you’re on an approved payment plan.21Internal Revenue Service. Failure to Pay Penalty
The practical rule: if you can’t pay, file anyway. The filing penalty is ten times steeper than the payment penalty. Filing on time and setting up a payment plan costs far less than skipping the deadline.
Willfully refusing to file is a federal misdemeanor. Conviction carries a fine of up to $25,000 and up to one year in prison.22Office of the Law Revision Counsel. 26 USC 7203 – Willful Failure to File Return, Supply Information, or Pay Tax Criminal cases are rare and reserved for deliberate evasion, not honest mistakes or late filings.
Don’t Forget State Taxes
Federal is only half the story for most Americans. The majority of states levy their own income tax, with rates that vary widely. Eight states have no individual income tax. If you live in a state that does, you generally file a separate state return using much of the same information from your federal one. State deadlines usually match the April 15 federal date but not always, so check your state tax agency’s website for the forms and specifics that apply where you live.