Doing your taxes means filing a return with the IRS that reports last year’s income and reconciles it against what was already withheld from your paychecks or paid during the year. If too much was withheld, you get a refund. If too little was withheld, you owe the difference. For most people the deadline is April 15, and for the 2026 tax year you generally don’t have to file at all if your gross income was below $16,100 (single) or $32,200 (married filing jointly).1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill
What Filing a Return Is Actually Doing
Federal law requires employers to withhold a portion of your wages and send it to the IRS on your behalf throughout the year.2Office of the Law Revision Counsel. 26 USC 3402 – Income Tax Collected at Source Those withholdings are estimates based on the Form W-4 you filled out when you were hired. Your actual tax bill depends on your total income for the year, the deductions you qualify for, and any credits you can claim.
Filing is the formal process of running those real numbers and comparing the result against what has already been sent in. Two outcomes are possible. Your employer withheld more than you actually owe, and the IRS sends the extra back as a refund. Or your withholding fell short and you owe the balance. Either way, filing is how the year gets settled.
Whether You Have to File
Whether filing is legally required depends mainly on how much you earned and your filing status. For tax year 2026, the thresholds match the standard deduction. You generally must file if your gross income was more than:1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill
- $16,100 if single or married filing separately
- $32,200 if married filing jointly
- $24,150 if head of household
Filers 65 and older have higher thresholds because they qualify for an additional standard deduction, and for 2025 through 2028 they can also claim a new enhanced deduction of $6,000 per person.3Internal Revenue Service. 2026 Filing Season Updates and Resources for Seniors
Self-employment changes the math dramatically. If you earned $400 or more in net self-employment income, you have to file regardless of your total, because you owe self-employment tax that no employer withheld for you.4Internal Revenue Service. Topic No. 554, Self-Employment Tax The combined rate is 15.3%, covering Social Security and Medicare.5Office of the Law Revision Counsel. 26 USC 1401 – Rate of Taxp>
Even if your income falls below the threshold, filing voluntarily is often worth it. If your employer withheld federal tax from your paychecks, the only way to get that money back is to file. You may also qualify for refundable credits like the Earned Income Tax Credit, which can pay out a refund even when you owed no tax at all.
What You Need to Gather
Before you can fill out a return you need the paperwork that shows what you earned and what was already withheld:
- Form W-2 from each employer, showing your wages and taxes withheld
- 1099 forms from banks, clients, brokerages, and other payers reporting freelance earnings, interest, dividends, or retirement distributions6Internal Revenue Service. When Would I Provide a Form W-2 and a Form 1099 to the Same Person?
- Social Security numbers for you, your spouse if filing jointly, and any dependents
- Records of deductible expenses if you plan to itemize: charitable donations, medical bills, mortgage interest, student loan interest
All of it feeds into Form 1040, the standard individual return. You report gross income, subtract qualifying adjustments to reach your adjusted gross income, then apply either the standard deduction or itemized deductions to arrive at your taxable income. The tax owed on that figure is what gets compared against your withholding.
How Deductions and Credits Change the Number
These are the two tools that lower what you owe, and they work very differently. A deduction reduces the amount of income that gets taxed. The 2026 standard deduction is $16,100 for single filers, $32,200 for joint filers, and $24,150 for heads of household.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill You take either the standard deduction or the total of your itemized deductions, whichever is larger. Most filers take the standard because it’s already high.
A credit is stronger. It reduces your actual tax bill dollar for dollar. A $1,000 credit knocks $1,000 off what you owe. A $1,000 deduction only saves you $1,000 times your tax rate, so a filer in the 12% bracket saves $120 from the same $1,000. Some credits are refundable, meaning the excess comes back to you as a refund if the credit is bigger than the tax you owed.
How to Submit Your Return
The vast majority of returns are filed electronically. Tax preparation software walks you through the forms, checks the math, and transmits your return to the IRS. You get an electronic confirmation, and refunds on e-filed returns generally arrive within 21 days.7Internal Revenue Service. Processing Status for Tax Forms
If your adjusted gross income was $89,000 or less, IRS Free File gives you free access to brand-name tax software through the IRS website.8Internal Revenue Service. 2026 Tax Filing Season Opens With Several Free Filing Options Available The Direct File tool the IRS ran previously is not available for the 2026 season. Above the income limit, commercial software typically costs anywhere from about $30 to several hundred dollars depending on complexity.
You can also print Form 1040 and mail it in, but paper returns take significantly longer to process, and the IRS won’t even begin researching the status of a mailed return until at least six weeks after you sent it.9Internal Revenue Service. Why It May Take Longer Than 21 Days for Some Taxpayers to Receive Their Federal Refund If you mail your return, sign it and include every required schedule and income statement.
The Deadline and Extensions
Individual returns are due April 15 of the year following the tax year. If April 15 falls on a weekend or federal holiday, the deadline shifts to the next business day.10Internal Revenue Service. When to File
If you need more time, filing Form 4868 before April 15 gives you an automatic extension to October 15.11Internal Revenue Service. Due Dates and Extension Dates for E-File The catch trips people up every year: an extension to file is not an extension to pay.12Internal Revenue Service. Taxpayers Should Know That an Extension to File Is Not an Extension to Pay Taxes If you expect to owe, you still need to estimate the amount and pay it by April 15. The extension only buys you time for the paperwork.
Getting a Refund or Paying What You Owe
After the math is done, you land in one of two places. If your withholdings and any estimated payments came in higher than your actual liability, you get a refund. Direct deposit is the fastest way to receive it, usually within 21 days on an e-filed return.
If you owe, the full balance is due by April 15 even if you filed an extension. When paying in full isn’t possible, the IRS offers two structured options:
- A short-term payment plan, available if you owe less than $100,000 combined in tax, penalties, and interest. It gives you up to 180 days with no setup fee if you apply online.
- A long-term installment agreement, available if you owe $50,000 or less and have filed all required returns. Setup fees run from $22 to $178 depending on how you apply and how you pay, though low-income taxpayers can have those fees reduced or waived.13Internal Revenue Service. Payment Plans; Installment Agreements
Interest accrues on any unpaid balance at 7% per year, compounded daily, whether or not you’re on a payment plan.14Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026 The rate is set quarterly and can change.
What Happens if You File Late or Pay Late
The IRS charges separate penalties for filing late and paying late, and the filing penalty is far steeper. This matters because people who can’t pay often assume there’s no point in filing. That’s backwards.
The failure-to-file penalty is 5% of your unpaid taxes for each month or partial month your return is late, up to 25%.15Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges If your return is more than 60 days late, a minimum penalty of $525 applies (or 100% of the tax owed, whichever is less).16Internal Revenue Service. Failure to File Penalty
The failure-to-pay penalty is much smaller: 0.5% of unpaid taxes per month, also capped at 25%. If you filed on time and set up an installment agreement, that rate drops to 0.25% per month.17Internal Revenue Service. Failure to Pay Penalty So even if you can’t cover the bill, file by April 15 anyway. Filing without paying triggers 0.5% a month. Not filing triggers 5% a month on top of whatever you owe.
In extreme cases, willfully refusing to file a required return is a federal misdemeanor carrying up to a year in prison and a fine of up to $25,000.18Office of the Law Revision Counsel. 26 USC 7203 – Willful Failure to File Return, Supply Information, or Pay Tax Prosecution is rare and reserved for deliberate evasion, but the gap between the file-late and pay-late penalties tells you how the IRS ranks these failures.
Two Things “Doing Your Taxes” Doesn’t Cover on Its Own
If you earn income no employer withholds from, filing an annual return isn’t the whole picture. Freelancers, independent contractors, landlords, and people with substantial investment income are expected to make quarterly estimated tax payments during the year, due April 15, June 15, September 15, and January 15.19Internal Revenue Service. Individuals 2 – Estimated Tax Missing them doesn’t trigger the failure-to-file penalty, but the IRS charges a separate underpayment penalty.
Federal taxes are also only half of what most people file. Most states have their own income tax and their own return, separate from the federal one. Nine states have no individual income tax: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. Everywhere else, most state returns start from your federal adjusted gross income, so filing software will usually handle both at once, sometimes for an extra fee.