Before you start: two things to confirm
If you haven't already, confirm these two things before you begin filing:
- Are you required to file? Check the income thresholds in our Do I Need to File guide. If your income is below the threshold for your filing status, you may not need to file — though you often should anyway if taxes were withheld.
- What form do you file? If you are a resident alien or U.S. citizen, you file Form 1040 (covered in this guide). If you are a nonresident alien (most F-1 students, J-1 visitors), you file Form 1040-NR instead. Check our Tax Residency guide if you're not sure.
Gather your documents before you open any tax software. The most common reason people get stuck mid-filing is that they're missing a W-2 or don't have their bank routing number handy. Do Step 1 first — everything else goes faster once you have everything in front of you.
The five steps to filing your first return
Understanding your W-2
The W-2 is the most important document for most first-time filers. Your employer sends it by January 31 and reports your total wages and the taxes withheld throughout the year.
The key boxes to know:
| Box | What it means |
|---|---|
| Box 1 | Total taxable wages — this is your gross income for employment purposes |
| Box 2 | Federal income tax withheld — this is what your employer already sent to the IRS on your behalf |
| Box 3 | Social Security wages |
| Box 4 | Social Security tax withheld (6.2% of Box 3) |
| Box 5 | Medicare wages |
| Box 6 | Medicare tax withheld (1.45% of Box 5) |
| Box 12 | Various codes — may include 401(k) contributions, health insurance premiums, and other benefits |
| Box 16–17 | State wages and state income tax withheld (for state return) |
Your employer withholds tax from every paycheck based on an estimate of what you'll owe. Box 2 shows the total withheld for the year. If too much was withheld (common for people with one job and no complex deductions), you get the excess back as a refund. If too little was withheld, you owe the difference.
Standard deduction vs. itemizing: which to choose
Every filer gets to reduce their taxable income by either the standard deduction or their actual itemized deductions — whichever is larger.
Standard Deduction
Fixed amount for single filers in Tax Year 2025. No receipts needed. Just choose it.
✓ Best for most first-time filers
Itemized Deductions
Add up qualifying expenses: mortgage interest, state taxes (up to $10,000), charitable donations, and more.
Only beneficial if total exceeds $14,600
Key deadlines to know
| Date | What happens |
|---|---|
| January 31, 2026 | Employers must send your W-2. Check your email and mailbox. |
| April 15, 2026 | Federal tax return due. Pay any taxes owed by this date even if you file an extension. |
| April 15, 2026 | Deadline to file Form 4868 for a 6-month extension (moves filing deadline to October 15). |
| October 15, 2026 | Extended filing deadline (if you filed Form 4868 by April 15). |
Filing Form 4868 gives you more time to submit your return — but it does NOT give you more time to pay taxes owed. If you expect to owe money, you must still pay an estimate by April 15 to avoid penalties and interest. You can pay at IRS.gov/payments even before you've completed your return.
The most common first-time filer mistakes
- Not filing at all because it feels overwhelming — This is the costliest mistake. Even an imperfect return is better than no return. File something and amend later if needed.
- Forgetting to include all income — Every W-2, every 1099, even income without a form (tips, cash payments, Venmo income). The IRS receives copies of all your 1099s and W-2s and will notice if something is missing.
- Wrong bank account number for direct deposit — Double-check every digit. If the number is wrong, your refund goes to someone else's account and recovery is difficult.
- Not saving a copy — Download your completed return as a PDF and keep it. You'll need your prior year's Adjusted Gross Income (AGI) to e-file next year, and tax returns are often required for loans, visa applications, and more.
- Missing refundable credits — Many first-time filers don't know they qualify for the Earned Income Tax Credit or education credits. Tax software asks about these automatically, but you need to answer the questions carefully.
Every first-time filer feels overwhelmed. The good news: the second year is dramatically easier. By then you know what forms to expect, where to enter things, and what to watch for. The investment of time in your first return pays off in every return that follows.