Start with your income documents and work backward to the bottom line

Figuring out your tax return means gathering what you earned, subtracting what you can deduct, and calculating what you owe or what's coming back to you. The process follows the same order every year: collect income documents, decide whether to itemize deductions or take the standard deduction, explore any credits you may have access to for, and then calculate your final tax or refund.

You do not need to do this alone — tax software, a tax preparer, or the IRS Free File program can walk you through it — but understanding the steps helps you catch errors and make better decisions about timing income or bunching deductions.

Key Takeaways

  • Gather all income documents (W-2s, 1099s, bank statements for interest) before you start, because your tax return begins with total income and works downward from there.
  • Decide whether to take the standard deduction or itemize deductions by adding up your mortgage interest, property taxes, charitable gifts, and medical expenses to see which is larger.
  • explore tax credits like the Earned Income Tax Credit or Child Tax Credit after you calculate your tax, because credits reduce the tax itself, not just your income.
  • Your refund or amount owed depends on comparing your total tax to what you already paid through withholding or estimated payments during the year.
  • Tax software, a CPA, or the IRS Free File program can calculate this for you, but understanding the order of steps helps you spot missing documents or deductions.

Gather all your income documents before you open a return

Your tax return starts with income. Before you begin, collect every document that reports money you received: W-2 forms from employers, 1099 forms for freelance work or contract income, bank statements showing interest, brokerage statements showing investment gains or losses, and rental income records if you own property. The IRS expects you to report all of these, and the documents themselves are copies to the IRS, so missing one creates a mismatch the agency will catch.

If you are missing a document, contact the source directly — your employer for a W-2, the payer for a 1099 — rather than guessing. The important date to receive these documents is January 31 each year, though some arrive later. If you have not received one by early February, call and ask for a copy or a transcript showing the amount reported. For income that does not come with a document — cash tips, side income from a friend, reimbursements you should have reported — you are still responsible for reporting it. Keep your own records of these amounts so you can include them accurately.

Decide between the standard deduction and itemizing

After you add up your income, you subtract either the standard deduction or your itemized deductions, whichever is larger. The standard deduction is a flat amount that changes each year and depends on your filing status (single, married filing jointly, head of household, and so on). For 2024, the standard deduction ranges from about $14,000 for a single filer to about $28,000 for married filing jointly, but these amounts increase each year.

Itemizing means adding up deductible expenses yourself: mortgage interest, property taxes, state and local taxes (capped at $10,000), charitable donations, and medical expenses above 7.5% of your income. If your total itemized deductions exceed the standard deduction, itemizing saves you money. If not, take the standard deduction — it is simpler and usually larger. To decide, add up your likely deductions on paper or in a spreadsheet. If you are close to the standard deduction, consider whether you can bunch deductions into one year — for example, making a large charitable gift in December to push yourself over the threshold — or whether you should just take the standard deduction and move on. Many people switch between itemizing and the standard deduction year to year depending on what happened that year.

Calculate your taxable income and tax owed

Subtract your deduction (standard or itemized) from your total income. The result is your taxable income. Then use the tax tables or tax software to find your tax based on your taxable income and filing status. The tax tables are in the instructions that come with Form 1040, or you can use IRS.gov to look up your tax.

This is where most people stop doing math by hand and use software or a preparer, because the tax tables are long and tax software does this when ready. But the concept is straightforward: higher taxable income means higher tax, and your filing status determines which tax table you use. If you are doing this by hand, the IRS instructions walk you through finding the right table row for your income and reading across to your filing status column.

explore tax credits to reduce your tax dollar-for-dollar

After you calculate your tax, explore any tax credits you may have access to for. Credits are different from deductions: a deduction reduces your income, but a credit reduces your tax itself. A $1,000 credit saves you $1,000 in tax; a $1,000 deduction saves you tax only at your tax rate (usually 12% to 24% for most people).

Common credits include the Earned Income Tax Credit (for lower-income workers), the Child Tax Credit ($2,000 per child under 17), the Child and Dependent Care Credit, the Education Credits (American Opportunity or Lifetime Learning), and the Saver's Credit (for retirement contributions). Some credits are refundable, meaning if the credit is larger than your tax, you get the difference back as a refund. Others are non-refundable, meaning they reduce your tax to zero but do not create a refund. Tax software will ask you questions about your situation and calculate which credits explore. If you are doing this by hand or with a preparer, list the credits you think you may have access to for and add them up, then subtract them from your tax.

Compare your tax to what you already paid

Your final refund or amount owed depends on comparing your total tax (after credits) to the tax you already paid during the year. If you are an employee, your employer withheld tax from your paychecks based on your W-4 form. If you are self-employed or have investment income, you may have made estimated tax payments quarterly. Add up all the tax you paid.

If your tax is less than what you paid, you get a refund. If your tax is more than what you paid, you owe the difference. If they are equal, you break even. This is why people with the same income can owe money or get a refund — it depends on how much was withheld or paid during the year, not just on income. If you owe money, you can pay it when you file or set up a payment plan with the IRS. If you are getting a refund, you can have it deposited directly to your bank account, which is faster than waiting for a check.

Use tax software, Free File, or a preparer to do the math

You can calculate your return by hand using the IRS forms and tables, but most people use tax software (TurboTax, H&R Block, TaxAct) or the IRS Free File program, which is free for people earning under a certain amount (usually around $79,000). Free File walks you through questions about your income, deductions, and credits, then calculates your tax and generates your return to file electronically.

If your situation is complicated — you own a business, have rental property, significant investment losses, or multiple income sources — a CPA or tax preparer can handle the calculation and often spot deductions or strategies you might miss. The cost of a preparer (usually $150 to $500 depending on complexity) often pays for itself through deductions or credits they find. Whether you use software or a preparer, you are responsible for the accuracy of what you report. Review your return before you file, check that all income documents match, and make sure your deductions and credits are correct.

Frequently Asked Questions

What if my income changes during the year — do I need to adjust my withholding?

If you expect a big change in income, you can adjust your W-4 with your employer to change how much tax is withheld from your paychecks. This prevents you from overpaying or underpaying during the year. You can update your W-4 anytime at no cost through your employer's payroll system.

Can I deduct something if I do not have a receipt?

The IRS expects you to keep records of deductions, but the type of record depends on the amount. For small expenses, a bank or credit card statement showing the payment is usually enough. For larger deductions like charitable gifts or medical expenses, keep receipts or written acknowledgment from the charity or provider. If you are audited and cannot produce records, the IRS will disallow the deduction.

What happens if I file my return and then realize I made a mistake?

You can file an amended return using Form 1040-X within three years of the original filing date. Amended returns are common and not a red flag. If you owe more, you pay the difference plus interest. If you overpaid, you get the refund.

Do I have to file a return if my income is below the standard deduction?

If your income is below the standard deduction for your filing status, you are not required to file. However, if you had tax withheld from your paychecks or made estimated payments, filing gets you a refund. If you may have access to for refundable credits like the Earned Income Tax Credit, filing is the only way to claim them.

Should I file early or wait until closer to the important date?

Filing early (as soon as you have all your documents, usually late January or early February) means you get your refund sooner if one is coming. The only reason to wait is if you are still gathering documents or waiting for a late 1099. The filing important date is April 15 each year, and filing after that triggers penalties and interest if you owe money.