Filing at the last minute? Don’t make these 7 expensive tax mistakes

Tax Day is close and many people still haven’t started filing, which increases stress and chances of costly mistakes. Experts say rushing before the April 15 deadline can lead to errors that delay refunds or create penalties.

Tax filing mistakes to avoid: 7 last-minute errors that can delay refunds, trigger penalties, and cost you money before April 15

Mistake #1 — Wrong name spelling: Your name must match exactly with IRS records, Social Security statements, and your last return. Even small differences like missing initials or extra spaces can delay your filing, as stated by USA Today.

Mistake #2 — Picking wrong filing status: Your status may change if your family situation changed during the year. Married couples often get more tax benefits by filing jointly because the standard deduction is higher. Filing separately may make you lose valuable deductions and credits. Divorced taxpayers may qualify for “head of household,” which can reduce taxes.


Mistake #3 — Wrong Social Security Number: Your SSN is your tax ID and must be entered correctly. A wrong number can cause your return to be rejected.

Mistake #4 — Missing income: You must report all income from 2025, not just salary. This includes W-2 forms plus all 1099 forms for interest, dividends, or side income, as noted by USA Today. Experts suggest making a checklist of expected forms and marking them as you collect them.

Mistake #5 — Wrong direct deposit details: Paper refund checks are being phased out because of fraud risks. Direct deposit is the fastest and safest way to get your refund in 2026. Entering wrong account or routing numbers will delay your refund.

Mistake #6 — Forgetting your signature: The IRS will not accept your return without signing and dating it.

Mistake #7 — Missing the April 15 deadline: Filing late can cost 5% of unpaid taxes per month, up to 25%. If you file but don’t pay, the penalty is smaller — about 0.5% per month, as cited by USA Today. Getting an extension only gives more time to file, not more time to pay. Experts say you should still pay estimated taxes when requesting an extension to avoid penalties.

Always review your full tax return once before submitting, especially if you rushed. Setting it aside and checking again the next day helps catch mistakes. Last-minute contributions to IRA or HSA accounts are still allowed until April 15, 2026. These contributions can reduce your taxable income and lower what you owe. Rushing your taxes can cost money — check details, report all income, choose the right status, and don’t miss the deadline.

FAQs

Q1. What happens if I file taxes after April 15?

You may face a penalty of up to 5% per month on unpaid taxes, and interest can also be added.

Q2. Can I still reduce my taxes at the last minute?

Yes, you may lower your tax by making eligible IRA or HSA contributions before the deadline.