In 2026, more than 160 million people are expected to file their tax returns. The tax season starts on January 26, 2026. Most people file correctly, but even small mistakes can delay a refund or bring an IRS notice. Common errors include a wrong Social Security number, missing income from 1099 forms, claiming too many deductions, or filing late.
For many people, a tax refund is the biggest amount of money they get in a year. In 2025, the average refund was over USD 3,000. If there is a mistake, this money can be stuck for many weeks.
The IRS now uses computers to check your data. They match your return with your W-2, 1099 forms, and past returns. If something does not match, your refund can stop, or you can get a notice from the IRS.
Many mistakes happen because people file at the last minute. When people rush, they can forget income, type wrong numbers, or miss forms. If you forget to report 1099 income from freelancing, side jobs, or investments, the IRS will still know because they also get a copy. This can delay your refund or cause problems.
Wrong personal details can also stop your refund. A small typing error, like a wrong Social Security number or wrong bank account number, can freeze your return. If your bank number is wrong, your refund can fail or come by mail, which is much slower. Always check your Social Security numbers, date of birth, and bank details.
Claiming too many business losses or deductions is risky. If you run a small business or do freelance work, the IRS expects you to try to make a profit. If you show losses every year, they may check your return.
You must also report all your income. Apps and websites can send 1099 forms to the IRS, and their computers can easily catch hidden income.
The simple truth is that most people will never face a big audit. But refund delays and IRS notices are common, and they usually happen because of small, simple mistakes. So be careful, be honest, check your details, and file early. That is the easiest way to protect your refund.
