Updated October 24, 2026. Quick answer: Tax Topic 303 is a checklist of questions to answer before you file. It opens by saying you are responsible for every entry on the return, even when someone else prepares it, and it then covers names and numbers, filing status, dependents, income, signatures, attachments and refunds.
Quick reference
| Item | What the IRS topic says |
|---|---|
| Who is responsible | “you are responsible for all of the information entered on your return and any errors may delay the processing of your return.” |
| Filing status | “Did you choose only one correct filing status?” |
| Signatures | “Did you sign and date the return?” |
| W-2 attachment | “Do you have a Form W-2 from each of your employers and did you attach Copy B of each Form W-2 to your return?” |
| Direct deposit | “did you double-check your routing and account numbers for your financial institution?” |
| Records | “Did you make a copy of the signed return and all schedules for your own records?” |
Review the whole return
The topic begins with “Before filing your return, make sure it’s correct and complete.” It continues “It’s important that you review your entire return, even if you have someone else prepare it”
On e-filing, the topic says “The e-file system often detects common errors and rejects your tax return, sending it back to you for correction.” It also states
“Submitting your tax return electronically ensures greater accuracy than mailing your return.”
Names, numbers, status and dependents
The first checklist items ask about identification: “Did you clearly print your name, taxpayer identification number, and current address, including your ZIP code, directly on your return?”
On Social Security numbers, the checklist says “If using Social Security numbers, enter the names and numbers exactly as they appear on each person’s Social Security card.”
On filing status and dependents, it asks “Did you enter the correct dependent information?” and, for the credit, “Did you check the box to show that your dependent qualifies for the child tax credit or credit for other dependents?”
On the standard deduction, it asks “If you’re taking the standard deduction and checked any box indicating either you or your spouse are age 65 or older or are blind, did you find the correct standard deduction?” Current amounts are on the standard deduction page.
Income, math, attachments and mailing
On income, the checklist asks “Did you enter your income on the correct lines?” On deductions and credits it asks “Did you calculate deductions and credits correctly, put them on the right lines, and attach the necessary forms or schedules?”
On arithmetic and formatting, it asks “Did you put parentheses around negative amounts?” and “Did you figure the tax correctly?”
On multiple jobs, it says “If you have more than one job, combine the wage and withholding amounts from all Forms W-2 you received and report those amounts on one return.” On Form 1099-R, “Did you attach each Form 1099-R that shows federal tax withholding?”
For mailing, it asks “Did you use the correct mailing address from your tax form instructions?” and “Did you use the correct postage on the envelope?”
For a balance due, it asks “If you owe tax, did you make a payment?” The line by line pages start at Form 1040 line by line.
Where this comes from
This page describes the IRS page titled Topic no. 303, Checklist of common errors when preparing your tax return, as served on irs.gov on October 24, 2026. The IRS page shows that it was last reviewed or updated on 24 Sep 2026. The IRS can change a topic after we read it, and the IRS page controls. General information, not tax or legal advice.
Common mistakes
- Assuming a preparer carries the errors. The topic says “you are responsible for all of the information entered on your return”
- Checking more than one filing status. The checklist asks “Did you choose only one correct filing status?”
- Typing a name that differs from the card. The checklist says “enter the names and numbers exactly as they appear on each person’s Social Security card.”
- Signing a joint return once. The checklist asks “If it’s a joint return, did your spouse also sign and date the return?”
- Reporting each W-2 on a separate return. The checklist says to “report those amounts on one return.”
Related: IRS tax topics by number, Form 1040 line by line, Form 1040, Standard deduction, W-2 box 1, and Form 1040 lines 9 to 11, total income and AGI.
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Answer againSources
- IRS, Topic no. 303, Checklist of common errors when preparing your tax return (irs.gov): https://www.irs.gov/taxtopics/tc303
- IRS, Tax topics index (irs.gov): https://www.irs.gov/taxtopics
Read from the IRS pages linked above on October 24, 2026. General information, not tax or legal advice. The IRS topic page and the instructions for your own form control, and your own facts decide the outcome.