Federal rules for readers across the U.S.
7 Tax Filing Mistakes First-Timers Make
By Christian Brinkley. Reviewed October 8, 2026.
Educational information only, not personalized tax, legal, or investment advice. Christian is a licensed insurance agent (NC Life & Health), not a CPA or registered investment adviser. Discuss your own situation with a qualified professional.
Mistake 1: Picking the wrong filing status
Your filing status changes your standard deduction and your tax brackets. Single people sometimes file as head of household without qualifying, or married couples file separately and lose credits. For 2026 the standard deduction is $16,100 for single filers and $32,200 for joint filers, so the status you pick moves real money.
Mistake 2: Missing the standard deduction
Most first-timers should take the standard deduction instead of itemizing. Itemizing only wins if your deductions beat the standard amount, which is rare without a mortgage. Software handles this choice automatically, but paper filers sometimes leave the standard deduction unclaimed.
Mistake 3: Forgetting 1099 income
Freelance gigs, bank interest, and stock sales all generate 1099 forms that the IRS already has. Leave one off your return and you will get a notice months later with interest. Gather every 1099 before you start, including ones from banks you barely use.
Mistake 4: Making math errors
Simple arithmetic mistakes are one of the top reasons returns get delayed. E-filing with tax software nearly eliminates them because the math is automatic. If you file on paper, double-check every line and have someone else review it.
Mistake 5: Missing the deadline
The filing deadline is usually April 15, and missing it without an extension triggers a failure-to-file penalty. If you cannot finish in time, file for an extension, which gives you six more months to file. An extension extends the paperwork, not the payment, so pay what you owe by April.
Mistake 6: Not keeping copies
Keep a copy of your return and every supporting document for at least three years. You will need them for loans, financial aid, and any IRS questions. A simple folder on your computer or a scanned PDF backup is enough.
Mistake 7: Filing a slow paper return
Paper returns take weeks longer to process than e-filed ones, and refund delays stretch into months. E-filing with direct deposit is the fastest way to get your refund. There is rarely a reason for a first-timer to mail a return.
| Topic | How they compare |
|---|---|
| Wrong filing status | Match your status to IRS rules, not habit |
| Missing the standard deduction | Take it unless itemizing clearly wins |
| Forgetting 1099 income | Collect every 1099 before you start |
| Math errors | E-file so software does the math |
| Missing the deadline | File an extension, and pay by April |
| Not keeping copies | Save returns and documents three years |
| Filing a slow paper return | E-file with direct deposit |
Your records checklist
- Confirm your filing status matches IRS rules for your situation.
- Collect every W-2 and 1099 before you start the return.
- E-file and choose direct deposit for the fastest refund.
- Save a copy of the return and all documents for three years.
Common questions
- What happens if I miss the tax filing deadline?
- You face a failure-to-file penalty that grows monthly on unpaid tax. File for an extension to get six more months for the paperwork. The extension does not delay payment, so pay what you estimate you owe by April 15.
- Should a first-timer itemize or take the standard deduction?
- Take the standard deduction unless your itemized deductions clearly beat it. For 2026 it is $16,100 single and $32,200 joint. Most first-timers without a mortgage come out ahead with the standard deduction.
Sources and current instructions
Check the tax year and any later updates before acting. These are the primary sources used for this guide.