Here’s the thing nobody really explains when you get your first paycheck: the IRS isn’t waiting on you to tell them what you earned. Your employer already did that.
Every year, employers are required to file a Form W-2 for every employee they paid. That form reports your wages, tips, and other compensation — plus all the income and Social Security and Medicare taxes that were withheld from your checks. One copy goes to you. Another copy goes to the IRS. And your employer is required to file that form with the Social Security Administration too.
So the IRS has a record of your income whether you file a return or not.
It’s not just employers, either. Banks, investment accounts, freelance clients, and other income sources all have their own reporting requirements. If you earned money from any of these — through a 1099 form, for example — that information is also reported to the IRS. The Taxpayer Advocate Service specifically calls out W-2s, 1098s, and 1099s as forms the IRS uses to verify what you actually earned.
What this means in practice: if you don’t file a return, the IRS can compare what your employer reported against what you filed — or notice that you filed nothing at all. That mismatch is exactly what triggers an underreported income notice.
Not filing doesn’t protect you. It just creates a problem where one didn’t have to exist.
If you’re a student or teen with a part-time job, you might not owe any taxes at all — but you may still need to file a return to get back any taxes that were withheld from your paychecks throughout the year. That money doesn’t automatically come back to you. You have to ask for it by filing. In most years, the deadline to file your federal tax return is April 15 — so don’t wait until the last minute.