Common first-time filer mistakes (and how to avoid them)

Nobody expects to be perfect at taxes on the first try, and the good news is that most first-timer mistakes are simple and preventable. Knowing them in advance is half the battle. Here are the common ones, each with an easy fix.

Mistake 1: Filing before all your forms arrive

Eager to get it over with, new filers sometimes submit as soon as their first W-2 lands. But if another income form shows up later, they've left income off — and the IRS, which gets copies of every form, notices. Fix: wait until all your W-2s and 1099s have arrived (usually by February) before filing.

Mistake 2: Typos in the important numbers

A wrong Social Security number, misspelled name, or transposed bank routing number can reject your return or misroute your refund. Fix: slow down on the identity and bank fields and double-check them against the actual documents before submitting.

Mistake 3: Forgetting side or gig income

Cash from a side hustle, a weekend of rideshare driving, or freelance work still counts as income — even if you didn't receive a form for it, and even if it was small. Leaving it off is one of the most common errors. Fix: report all your income, including gig and cash work, not just what's on a W-2.

Mistake 4: Missing credits you qualify for

First-timers often overpay by skipping credits they're entitled to — like education credits as a student or the Earned Income Tax Credit as a lower-income worker. Fix: use tax software and answer all its questions honestly; it surfaces credits automatically. Don't skip sections just because they look irrelevant.

Mistake 5: Not filing because 'I didn't make much'

Some new earners skip filing entirely, assuming low income means it doesn't matter. But if tax was withheld from your paychecks, filing is how you get it refunded — and refundable credits can pay you even with little income. Fix: if you had any withholding or might qualify for a refundable credit, file even when you're not required to.

Mistake 6: Choosing the wrong filing status

Defaulting to 'single' when you actually qualify for head of household can cost real money in a lost, larger deduction. Fix: if you support a dependent in your home, check whether head of household applies before you settle on single.

Mistake 7: Missing the deadline

The filing deadline is usually in mid-April. Missing it can mean penalties and interest if you owe. Fix: mark the deadline, and if you can't finish in time, file for an extension — but remember an extension gives you more time to file, not more time to pay.

Mistake 8: Not keeping a copy

Once it's submitted, beginners often forget the return exists — until they need it for a loan, financial aid, or next year's filing. Fix: save a PDF of your finished return and its confirmation somewhere safe. A good rule of thumb is to keep tax records for several years.

The takeaway

Most first-time mistakes come down to rushing: filing early, skipping questions, or fat-fingering a number. Slow down, wait for every form, report all income, answer every prompt, mind the deadline, and save a copy. Do those and your first return will be clean. For anything genuinely confusing, a tax professional is worth the peace of mind.