Filing Taxes: Status, Deductions, Brackets, and Deadlines

Filing taxes means sending the IRS a return that reports what you earned during the year, subtracts what the law lets you subtract, calculates the tax you owe, and compares that figure against what your employer already withheld or what you paid in quarterly installments. If more was withheld than you owe, you get a refund. If less, you pay the difference. For the 2025 tax year, a single person under 65 generally has to file only if they earned $15,750 or more.¹

Do You Actually Have to File

Whether you’re required to file depends mostly on your income, your filing status, and your age. The IRS adjusts the thresholds each year. For the 2025 tax year (returns due April 2026), the gross income thresholds are:¹

Single, under 65: $15,750
Single, 65 or older: $17,550
Married Filing Jointly, both under 65: $31,500
Married Filing Jointly, one spouse 65 or older: $33,100
Head of Household, under 65: $23,625
Head of Household, 65 or older: $25,625
Qualifying Surviving Spouse, under 65: $31,500

Married couples who file separately have a threshold of just $5, which effectively means both spouses must file whenever they choose that status.¹

Some situations require a return even if your income falls below those numbers. If you had $400 or more in net self-employment income, you owe self-employment tax and have to file to report it.² If you received advance Premium Tax Credit payments for marketplace health insurance, you have to file so those payments can be reconciled against your actual income.³

Even when you’re not required to file, it’s often worth doing. If your employer withheld federal tax from your paychecks, filing is the only way to get that money back. You may also qualify for refundable credits like the Earned Income Tax Credit, which pays up to $8,046 for the 2025 tax year depending on income and family size.⁴ Not filing in that case leaves real money with the government.

Pick Your Filing Status

Your filing status sets your standard deduction, your tax brackets, and which credits you can take. There are five options:⁵

Single: unmarried with no dependents, or married but not eligible for any other status.
Married Filing Jointly: you and your spouse combine income and deductions on one return. This usually produces the lowest combined tax bill.
Married Filing Separately: each spouse files their own return. It rarely saves money, but can make sense when one spouse has large medical expenses, student loan issues, or when you want to keep liability separate.
Head of Household: unmarried (or considered unmarried) and paying more than half the cost of maintaining a home for a qualifying dependent who lived with you more than half the year. A dependent parent doesn’t have to live with you.
Qualifying Surviving Spouse: available for two tax years after a spouse’s death if you maintain a home for a dependent child. You get the same standard deduction and bracket widths as Married Filing Jointly.

Head of Household is the status most commonly claimed by mistake. Being unmarried with a child doesn’t automatically qualify you. You have to pay more than half the household expenses for the year, and the child has to live with you more than half the year. The IRS checks this, and errors here trigger audits and repayment demands.

Gather Your Paperwork First

Before you fill out any forms, you need the documents that prove what you earned and what you can subtract. Employers must send you a W-2 by the end of January, showing your total wages, federal and state taxes withheld, and Social Security and Medicare contributions.⁶

Other income comes on various 1099 forms. Banks send a 1099-INT for interest and a 1099-DIV for dividends. Companies that paid you as an independent contractor send a 1099-NEC when they paid you $600 or more.⁷ Payment apps may send a 1099-K for selling goods or receiving business payments.⁸

You’ll also want anything that supports deductions or credits: receipts for charitable donations, mortgage interest statements (Form 1098), medical expense records, and tuition payments. Have your Social Security number, numbers for any dependents, and your bank account and routing numbers ready if you want a refund deposited directly.

A missing 1099 doesn’t mean the IRS doesn’t know about the income. The same form went to them. If you file without reporting income that shows up on a 1099, the IRS computers will flag the mismatch and send you a notice.

How the Calculation Works

The federal return, Form 1040, walks through a calculation that moves from your total income down to the final amount you owe or get back.⁹ It has four stages: gross income, adjusted gross income, taxable income, and tax after credits.

From Gross Income to AGI

Gross income is everything you earned: wages, freelance pay, interest, dividends, rental income, investment gains. From that total you subtract “above-the-line” adjustments. Common ones are traditional IRA contributions, student loan interest, educator expenses, and the deductible portion of self-employment tax. The result is your Adjusted Gross Income, or AGI. That number matters because it controls eligibility for many credits and deductions further down the form.

Standard Deduction or Itemized

After calculating AGI, you subtract either the standard deduction or your total itemized deductions, whichever is larger. For the 2025 tax year, the standard deductions are:⁵

Single: $15,750
Married Filing Jointly: $31,500
Head of Household: $23,625
65 or older adds $2,000 if single, $1,600 per qualifying spouse if married

Most people take the standard deduction because it beats what they could itemize. If you do itemize, the biggest line items are usually state and local taxes (capped at $40,000 for most filers, or $20,000 if married filing separately), home mortgage interest, and charitable contributions.¹⁰ The $40,000 SALT cap was raised from $10,000 starting in 2025 and phases down for taxpayers with modified AGI above $500,000.¹¹

Brackets, Then Credits

Whatever remains after the deduction is your taxable income. It gets taxed in layers called brackets. For 2025, the rates range from 10% on the first $11,925 of taxable income for a single filer up to 37% on income above $626,350.¹² A common misconception is that moving into a higher bracket means all your income gets taxed at the higher rate. It doesn’t. Only the income within that bracket gets the higher rate.

Then you apply credits. Credits are more powerful than deductions: a $1,000 deduction saves you $1,000 times your tax rate (maybe $220), while a $1,000 credit cuts your tax bill by the full $1,000. Nonrefundable credits like the Child and Dependent Care Credit can reduce your tax to zero but won’t generate a refund on their own. Refundable credits like the Earned Income Tax Credit can push your balance below zero, meaning the IRS sends you money even if you owed nothing.⁴

The final step compares your net tax against what you already paid during the year through paycheck withholding or quarterly estimated payments. Overpaid, refund. Underpaid, balance due.

How and When to Submit the Return

Once the return is done, you send it to the IRS electronically or on paper. Electronic filing is faster, more accurate, and gives you a confirmation that the IRS received it. You can e-file through commercial tax software, a paid preparer, or the IRS Free File program, which offers free guided software to anyone with an AGI of $89,000 or less.¹³ E-filed returns are generally processed within 21 days.¹⁴

Paper filing still works. Print the forms, sign the return, and mail everything to the IRS service center designated for your state. Paper refunds often take six weeks or more.¹⁵ Professional preparation costs vary with the complexity of your return and where you live, but a standard individual return with state filing typically runs between $150 and $800.

The federal deadline is April 15 of the year after the tax year ends. If April 15 falls on a weekend or legal holiday, the deadline shifts to the next business day.¹⁶ If you can’t finish by then, you can request an automatic six-month extension by filing Form 4868, which pushes your filing deadline to October 15.¹⁷

Here’s where people get burned. The extension gives you more time to file the paperwork. It does not give you more time to pay. If you owe taxes, that payment is still due by the original April deadline. Anything unpaid after that date starts collecting interest and penalties whether you extended or not.

What Happens if You File or Pay Late

The IRS imposes separate penalties for filing late and paying late, and the filing penalty is far steeper. That’s why, if you can only do one on time, paying matters more than filing.

The failure-to-file penalty is 5% of the unpaid tax for each month or partial month the return is late, up to 25%. If the return is more than 60 days late, the minimum penalty is $525 or 100% of the unpaid tax, whichever is less.¹⁸

The failure-to-pay penalty is much smaller: 0.5% of unpaid taxes per month, also capped at 25%.¹⁹ On top of the penalties, the IRS charges interest on unpaid balances, running from 6% to 7% annually depending on the quarter for the first half of 2026.²⁰ Unlike the penalties, interest compounds daily and has no cap.

Practical rule: if April arrives and you can’t afford the full bill, file the return anyway and pay as much as you can. Filing on time eliminates the larger 5% monthly penalty. You can then set up a payment plan for the balance.

After You File

Keep your copies organized. The IRS recommends holding onto your return and supporting documents for at least three years from the date you filed or the due date, whichever is later. That matches the IRS’s statute of limitations for most audits.²¹

If you’re expecting a refund from an e-filed return, you can track it with the “Where’s My Refund?” tool on the IRS website. Most e-filed refunds arrive within three weeks, though returns claiming the Earned Income Tax Credit or Additional Child Tax Credit take longer because the IRS is required by law to hold those refunds until mid-February.¹⁵

If your return shows a balance due, you can pay through IRS Direct Pay, by mailing a check, or through a third-party processor. Whatever you choose, get the payment in by April 15 to avoid the penalties and interest above.¹⁹

If the IRS sends you a notice after filing, don’t panic. Most notices are computer-generated and flag things like math errors or mismatches between what you reported and what employers or banks reported. Read the notice, compare it against your records, and respond by the date listed. Ignoring IRS mail is how small issues become expensive ones.²²

1
Internal Revenue Service. Check if You Need to File a Tax Return
2
Internal Revenue Service. Topic No. 554, Self-Employment Tax
3
Office of the Law Revision Counsel. 26 US Code 6012 – Persons Required to Make Returns of Income
4
Internal Revenue Service. Earned Income and Earned Income Tax Credit (EITC) Tables
5
Internal Revenue Service. Publication 501 (2025), Dependents, Standard Deduction, and Filing Information
6
Internal Revenue Service. About Form W-2, Wage and Tax Statement
7
Internal Revenue Service. Reporting Payments to Independent Contractors
8
Internal Revenue Service. Form 1099-K FAQs
9
Internal Revenue Service. About Form 1040, U.S. Individual Income Tax Return
10
Internal Revenue Service. Topic No. 503, Deductible Taxes
11
Internal Revenue Service. How to Update Withholding to Account for Tax Law Changes for 2025
12
Internal Revenue Service. Federal Income Tax Rates and Brackets
13
Internal Revenue Service. 2026 Tax Filing Season Opens With Several Free Filing Options Available
14
Internal Revenue Service. Processing Status for Tax Forms
15
Internal Revenue Service. Refunds
16
Internal Revenue Service. When to File
17
Internal Revenue Service. Get an Extension to File Your Tax Return
18
Internal Revenue Service. Failure to File Penalty
19
Internal Revenue Service. Failure to Pay Penalty
20
Internal Revenue Service. Quarterly Interest Rates
21
Internal Revenue Service. How Long Should I Keep Records
22
Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges