If your employer doesn’t take out federal taxes from your paycheck, you still owe every dollar of federal income tax on those wages, plus your employee share of Social Security and Medicare, when you file your return. The IRS collects from you at filing time regardless of whose mistake caused the missing withholding. Your employer has its own separate problem with the IRS, but that doesn’t shrink your bill. What you can control is how quickly you catch the issue, how you file, and whether you avoid stacking penalties on top of the tax.
What You Actually Owe
Federal law requires employers to deduct and withhold federal income tax from wage payments. When that step is skipped, the obligation shifts to you at filing time, calculated at your normal tax bracket as if the money had been withheld all along.
Your liability doesn’t stop at income tax. You owe the employee share of FICA too: 6.2% for Social Security on earnings up to $184,500 in 2026, and 1.45% for Medicare on all wages. If you earned more than $200,000, an extra 0.9% Medicare tax applies to wages above that threshold. Your employer is supposed to match the Social Security and base Medicare portions, but their failure to pay their half is a separate matter between them and the IRS.
One long-term consequence is easy to miss. Social Security retirement and disability benefits are calculated from your reported earnings history. If your employer never reported your wages or paid FICA, those earnings may not show up on your record. Create an account at ssa.gov and check your earnings statement so you know where you stand.
What to Do the Moment You Notice
Don’t wait for tax season to deal with this. Review your pay stubs first. Compare gross to net and look for line items showing federal income tax, Social Security, and Medicare deductions. A missing line means missing withholding.
Then talk to your employer. Sometimes it’s a payroll error or a W-4 that was entered incorrectly, and HR or the owner can fix it in a pay cycle. If the response is that you’re an independent contractor and you believe you’re an employee, that’s a classification dispute, not a withholding mistake, and it needs a different fix (see below).
If the problem was a data entry issue or you need to catch up on underwithholding, submit a new Form W-4. Line 4(c) lets you request an extra flat dollar amount withheld from each paycheck, which can help make up ground.
If your employer won’t cooperate, start setting aside money now. Move roughly 20% to 30% of each paycheck into a separate account so the bill doesn’t blindside you at filing time.
Filing When Your W-2 Never Arrives
Employers are supposed to send W-2s by January 31. An employer that wouldn’t withhold often won’t issue a W-2 either. If yours hasn’t arrived by the end of February and the employer won’t cooperate, call the IRS at 800-829-1040 or visit a Taxpayer Assistance Center. The IRS will send the employer a letter demanding a corrected W-2 within ten days, and will send you Form 4852 to use as a substitute.
Form 4852 lets you report your wages and any taxes withheld using the best records you have. Your final pay stub of the year is the most reliable source because it usually shows year-to-date gross wages and any state or local tax that was taken out. If you don’t have pay stubs, add up bank deposits from the employer for the year. The form asks how you estimated the figures and what you did to try to get a correct W-2.
Attach Form 4852 to your Form 1040 and file by the normal deadline. Filing on time matters even when your numbers are estimates, because the late-filing penalty is the steepest one in play. If the real W-2 shows up later and the numbers don’t match, amend with Form 1040-X.
Penalties That Can Land on You
Even though the withholding failure wasn’t your fault, three penalties can still hit you if you handle the return badly:
- Failure to file. 5% of unpaid tax per month or partial month, up to 25%. This is the expensive one, and it’s entirely avoidable. File on time even if you can’t pay.
- Failure to pay. 0.5% of unpaid tax per month, up to 25%. Drops to 0.25% per month once you have an approved payment plan with the IRS.
- Underpayment of estimated tax. If you owed more than $1,000 at filing time and didn’t pay enough during the year through withholding or estimated payments, the IRS charges an underpayment penalty. As of early 2026, the underpayment interest rate is 7% per year, compounded daily.
The pattern that gets people into real trouble is skipping the return because they know they’ll owe. That’s the one move that turns a manageable bill into an expensive one. File on time, pay what you can, and request an installment agreement for the rest.
Estimated Payments and Safe Harbors Going Forward
You can’t retroactively withhold from paychecks you’ve already received, but you can make estimated tax payments for the current year to reduce or eliminate the underpayment penalty. Use Form 1040-ES. The 2026 quarterly due dates are:
- First quarter (Jan–Mar): April 15, 2026
- Second quarter (Apr–May): June 15, 2026
- Third quarter (Jun–Aug): September 15, 2026
- Fourth quarter (Sep–Dec): January 15, 2027
You can skip the January 15 payment if you file the full return and pay the balance by February 1, 2027.
The IRS won’t charge an underpayment penalty if you meet one of three safe harbors. Your total payments during the year (withholding plus estimated) must equal at least 90% of what you owe for the current year, or at least 100% of what you owed last year. If your adjusted gross income last year exceeded $150,000 ($75,000 if married filing separately), that second threshold rises to 110% of last year’s tax. The easiest route for most people: look up line 24 on last year’s return, divide by four, and pay that amount each quarter.
Once withholding at your job is fixed, file a new W-4 and use line 4(c) to add a flat extra amount per paycheck. That helps recover ground lost during the months with no deductions.
If You Were Actually Misclassified as a Contractor
This is the most common reason an employer “doesn’t withhold”: they’re treating you as a 1099 contractor when the working relationship looks like employment. Signs include getting a Form 1099-NEC instead of a W-2, no benefits, and the company controlling when, where, and how you work despite the contractor label.
The cost to you is real. An employee pays 7.65% in FICA and the employer matches it. A misclassified contractor pays both halves through self-employment tax at 15.3% on net earnings, and loses access to unemployment insurance and workers’ compensation.
File Form SS-8 to ask the IRS for an official determination of your worker status. The determination can take months, so file early. When you file your return, use Form 8919 to report your wages and pay only the employee share of Social Security and Medicare. If the IRS agrees you’re an employee, that’s how you avoid getting hit for the employer’s half.
Reporting Your Employer
Fixing your return and reporting the employer are two different tracks. For a straightforward failure to withhold or deposit, file Form 3949-A (Information Referral). The form asks for the employer’s name, address, and a description of what’s happening. You can submit it anonymously, though giving contact information helps if the IRS needs follow-up. The IRS won’t necessarily tell you what happens with the referral.
If the issue is misclassification, Form SS-8 (described above) is the right route, because it produces a status determination you can actually use on your own return. Form 3949-A reports the conduct; Form SS-8 fixes your tax treatment.
Whatever route you take on the reporting side, keep it separate from your own filing. Your return is due on time either way, and the numbers you owe don’t wait on any investigation of the employer.