Form 8919 is the IRS form a worker files to pay only the employee’s 7.65% share of Social Security and Medicare taxes on wages from a firm that paid them as an independent contractor when they should have been treated as an employee. Without it, that income lands on Schedule C and gets hit with the full 15.3% self-employment tax. Filing Form 8919 also credits the earnings to your Social Security record as wages, which matters for your future retirement and disability benefits.1Internal Revenue Service. Form 8919, Uncollected Social Security and Medicare Tax on Wages
What Form 8919 Actually Does
When a business misclassifies you, you typically get a 1099-NEC instead of a W-2, and no Social Security or Medicare tax is withheld. The default response — reporting the money on Schedule C and running it through Schedule SE — makes you pay both halves of FICA yourself: 15.3% on net earnings, covering the employer’s share and the employee’s share combined.
Form 8919 splits that in two. You pay the employee’s 6.2% Social Security plus 1.45% Medicare, and the employer still owes their matching 7.65% whether or not they ever pay it. On $80,000 of misclassified income, the difference is roughly $6,120 in tax you don’t owe. The IRS also posts the amount to your Social Security earnings history as wages rather than self-employment income.1Internal Revenue Service. Form 8919, Uncollected Social Security and Medicare Tax on Wages
Who Needs to File Form 8919
You file Form 8919 only when all four of the following are true:1Internal Revenue Service. Form 8919, Uncollected Social Security and Medicare Tax on Wages
- You performed services for a firm.
- You believe the pay was for work as an employee, not an independent contractor.
- The firm did not withhold your share of Social Security and Medicare taxes.
- One of the IRS reason codes — A, C, G, or H — applies to your situation.
Receiving a 1099 by itself is not enough. Your belief has to rest on the common law test: how much control the business exercised over your work. If the firm set your schedule, provided your tools, told you how to do the job, and treated the arrangement as ongoing, that generally points to employment regardless of what any contract called you.2Internal Revenue Service. Employee (Common-Law Employee)
The Four Reason Codes
For each firm you list on Form 8919, you enter a reason code:1Internal Revenue Service. Form 8919, Uncollected Social Security and Medicare Tax on Wages
- Code A: You filed Form SS-8 and received an IRS determination letter confirming you are an employee of the firm.
- Code C: You received other correspondence from the IRS stating you are an employee. This covers situations where the IRS determined you were an employee but granted the employer relief from employment taxes under Section 530 of the Revenue Act of 1978.
- Code G: You filed Form SS-8 but have not received a reply. If none of the other codes apply and you believe you should have been treated as an employee, this is your code. Form SS-8 must be filed on or before the date you file your tax return.
- Code H: You received both a W-2 and a 1099-NEC or 1099-MISC from the same firm, and the 1099 income should have been reported as wages on the W-2. Do not file Form SS-8 if this code applies.
Code G is the usual entry point when you suspect misclassification but do not yet have a ruling. It lets you pay the correct, lower amount now while the IRS investigates. If the IRS ultimately disagrees and finds you were a contractor, you can be billed for the additional tax plus penalties and interest.1Internal Revenue Service. Form 8919, Uncollected Social Security and Medicare Tax on Wages
How Form SS-8 Fits In
Form SS-8 asks the IRS to formally decide whether your relationship with a firm is employment or independent contracting. Either the worker or the business can file it.3Internal Revenue Service. Form SS-8, Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding The IRS weighs behavioral control, financial control, and the type of relationship — who directs the work, who provides tools and covers expenses, whether there are benefits and ongoing duties.4Internal Revenue Service. Worker Classification 101: Employee or Independent Contractor
The determination takes at least six months and often longer, which is why Code G exists. You do not wait for the ruling to file Form 8919. File Form SS-8 separately from your tax return; do not attach it.5Internal Revenue Service. Completing Form SS-8
Calculating the Tax
On Form 8919 you list each firm on its own line with the firm’s name, federal identification number, your reason code, the date you first provided services, and the income that should have been treated as wages. Then you apply three rates.
Social Security
The employee share is 6.2% of wages, up to the annual Social Security wage base. For 2026 that ceiling is $184,500.6Social Security Administration. 2026 Cost-of-Living Adjustment (COLA) Fact Sheet If you also had W-2 wages during the year, combine them with your Form 8919 income when checking the cap. Only the portion below the ceiling is taxed at 6.2%.7Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates
Medicare
The employee share of Medicare is 1.45% on every dollar of wages with no cap.7Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates
Additional Medicare
An extra 0.9% Medicare tax applies once total wages and compensation for the year exceed $200,000 for a single filer or $250,000 for married filing jointly. Those thresholds are set by statute and have not changed since the tax took effect in 2013.8Internal Revenue Service. Topic No. 560, Additional Medicare Tax
The combined amount goes on Line 13 of Form 8919. That is your employee share only. You are not responsible for the employer’s matching half.
Where It Goes on Your Return
The Line 13 total transfers to Schedule 2 (Additional Taxes) of Form 1040 at Line 6, labeled “Uncollected social security and Medicare tax on wages,” and rolls into your total tax for the year.9Internal Revenue Service. 2025 Schedule 2 (Form 1040) Additional Taxes E-file software handles the transfer for you. If you paper-file, attach Form 8919 to your 1040.
The filing deadline matches your regular return, generally April 15. Form 4868 extends the filing date to October 15, but the tax itself is still due in April.10Internal Revenue Service. Get an Extension to File Your Tax Return
The Risk if the IRS Disagrees
Filing under Code G is a self-assessment while the SS-8 investigation is pending. If the IRS later concludes you were correctly classified as a contractor, you owe the difference between what you paid (7.65%) and the full self-employment tax (15.3%), plus penalties and interest on the shortfall.1Internal Revenue Service. Form 8919, Uncollected Social Security and Medicare Tax on Wages
Keep whatever supports your claim of employee status: emails about how work was assigned, evidence you used company equipment, records of set schedules or required training, and any written agreements. Stronger documentation, lower risk.
One Thing Form 8919 Does Not Do
Filing does not settle the employer’s side. The business still owes its matching 7.65%, and the IRS can pursue penalties for failing to withhold, deposit, or file correct information returns. Your Form 8919 handles your own liability; it does not close the case against the firm that misclassified you.