Tax season has a way of starting fast and getting rushed even faster.
By the middle of filing season, many people are eager to submit their return, get their refund, and move on. But this is also when some of the most common filing mistakes happen—usually because people are working too quickly, filing before they have all their forms, or overlooking details that seem minor but can cause major delays.
If you’re getting ready to file, this is the perfect time for a quick check-in. A few extra minutes now can help you avoid refund delays, IRS notices, or unnecessary stress later.
Here are five common mistakes that can slow things down or put your return under extra scrutiny.
1. Entering the Wrong Bank Information
Direct deposit is the fastest way to receive a refund—but only if your banking information is correct.
A single wrong digit in your routing or account number can send your refund to the wrong account or cause the deposit to fail altogether. If that happens, your refund may be delayed while the payment is rejected and reissued another way.
Before you file, double-check:
- That the account is open and active
- Routing number
- Account number
- Whether the account is checking or savings
This seems simple, but it’s one of the easiest mistakes to make when you’re rushing.
2. Filing Before All Your W-2s or 1099s Arrive
A lot of people file as soon as they get one tax form—then realize later they were still missing income documents.
If you worked multiple jobs, freelanced, earned contract income, received interest, or had money come in from gig work, you may have more than one tax form to report. Filing too early without all your W-2s and 1099s can lead to an incomplete return, which may mean:
- An amended return later
- A delayed refund
- A notice asking why reported income does not match IRS records
This is especially important for people with side hustles, self-employment income, online sales, or platform-based earnings.
Before filing, make sure you’ve accounted for:
- All W-2s
- 1099-NEC or 1099-MISC
- 1099-K
- 1099-INT or 1099-DIV
- Any other income statements tied to your name or Social Security number
If you know money came in, don’t assume “no form” means “no reporting.”
3. Forgetting Side Income
This is one of the biggest red flags during tax season.
If you did any freelance work, content creation, consulting, delivery driving, reselling, cash jobs, or other side work, that income may still need to be reported—even if you didn’t receive a tax form for it.
Many taxpayers accidentally leave this out because:
- They only think about their main job
- The amount “wasn’t that much”
- They were paid through apps, cash, or transfers
- They didn’t get a 1099
But side income is still taxable in most cases, and leaving it off can create mismatches later if the IRS receives income reporting from a third party.
A good rule: if you earned it, count it.
Even small side income should be reviewed before filing so your return is complete and accurate.
4. Claiming the Wrong Dependent
Dependents can significantly affect your tax return, which is exactly why errors here can raise questions.
This mistake often happens when:
- Separated or divorced parents both claim the same child
- A taxpayer assumes they can claim a relative without checking the rules
- Someone claims a child who did not live with them long enough
- The wrong filing status is selected based on dependent status
When two people try to claim the same dependent, it can delay processing and may require extra documentation to sort out.
Before claiming a dependent, make sure you know:
- Who the child or person lived with most of the year
- Who provided financial support
- Whether someone else may already be eligible to claim them
- Whether the dependent actually meets IRS qualification rules
If you’re unsure, it’s better to verify first than fix it later.
5. Math Errors and Simple Data Entry Mistakes
Not every tax issue is complicated. Sometimes it’s just a typo.
A wrong Social Security number, misspelled name, transposed income figure, or incorrect date of birth can trigger delays. Even simple math errors can create processing issues, especially if numbers don’t line up across credits, withholding, or income totals.
Common entry mistakes include:
- Wrong Social Security numbers
- Incorrect birthdates
- Typos in income amounts
- Filing status selected incorrectly
- Missing signatures where required
- Decimal or digit errors in withholding or refund amounts
Tax software can help catch some of these, but it won’t catch everything if the original information entered is wrong.
Slow down and review every section before hitting submit.
A Quick Mid-Season Filing Check
Before you file, ask yourself:
- Do I have all of my tax forms?
- Did I include all income, including side work?
- Is my bank account information correct?
- Am I claiming the correct dependent?
- Have I reviewed every number and personal detail?
If the answer to any of those is “I’m not sure,” pause and double-check before filing.
Final Thoughts
Tax filing mistakes are common, especially in the middle of the season when people are feeling rushed. But the good news is that most of them are preventable.
A careful review now can help you avoid delays, protect your refund, and reduce the chance of unnecessary IRS issues later.
If you want your tax season to go smoother, don’t just file fast—file carefully.