If you changed jobs during the year and both employers withheld Social Security tax from your paychecks, you may have paid more than the law requires. Recovering an overpayment of Social Security tax after a job change is done on your federal tax return: add up the Social Security tax shown in Box 4 of every W-2 you received, subtract the annual maximum ($11,439.00 for 2026), and claim the difference as a refundable credit on Schedule 3, Line 11 of Form 1040.1Internal Revenue Service. Topic No. 608, Excess Social Security and RRTA Tax Withheld2Internal Revenue Service. 2025 Schedule 3 (Form 1040)
Why Two Employers Cause the Problem
Every employer withholds 6.2% for Social Security starting with your first dollar of wages, and each one stops only when your wages at that particular company reach the annual wage base.3Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates For 2026, that base is $184,500, and the most any individual owes in Social Security tax for the year is $11,439.00.4Social Security Administration. Contribution and Benefit Base Your new employer has no way of knowing what your previous employer already withheld. Each one treats you as if the year just started.
An example makes the size of the overpayment clear. Say you earned $110,000 at your first job, then $110,000 at a second job before year-end. Each employer withheld $6,820 in Social Security tax. Your combined withholding is $13,640, but your actual obligation is $11,439.00, because only the first $184,500 of your combined wages is subject to the tax. The extra $2,201 belongs back in your pocket.
How to Claim the Refund on Your Return
The IRS does not issue this refund automatically. You have to do the math and report it yourself.1Internal Revenue Service. Topic No. 608, Excess Social Security and RRTA Tax Withheld
Gather every W-2 you received for the tax year. Look at Box 4 on each one — that’s the Social Security tax the employer withheld. Add all the Box 4 amounts together, then subtract $11,439.00. The difference is your overpayment.
Report that amount on Schedule 3 (Form 1040), Line 11, labeled “Excess social security and tier 1 RRTA tax withheld.”2Internal Revenue Service. 2025 Schedule 3 (Form 1040) The Schedule 3 total flows into the payments section of your Form 1040, where it either increases your refund or reduces what you owe. Tax software usually handles this automatically once you enter all your W-2s, but check the math yourself. Software works with the data you give it, and a missed W-2 means a missed refund.
The credit is fully refundable. The IRS pays it even if your income tax liability for the year is zero.5Internal Revenue Service. 1040 (2025) Instructions Attach all your W-2s so the IRS can verify the withholding.
Deadline If You Missed It in a Prior Year
If you already filed a return for a year when this happened and didn’t claim the credit, you can still recover the money by filing an amended return. The IRS generally allows a refund claim within three years from the date you filed the original return or two years from the date you paid the tax, whichever is later.6Internal Revenue Service. Time You Can Claim a Credit or Refund After that window closes, the money is gone. If you changed jobs in any of the last few years and earned above the wage base, pull those old W-2s and check.
If the IRS Adjusts or Denies the Credit
Sometimes the IRS reduces or removes the credit, usually because W-2 data on file doesn’t match what you reported. You’ll typically get Letter 2893-C notifying you of the change.7Internal Revenue Service. Taxpayer Contacts Resulting From Notice Issuance Respond promptly with copies of all your W-2s. The problem is almost always a data mismatch that clears up once the IRS sees the actual forms.
When Only One Employer Overwithheld
The Schedule 3 credit is only for situations with two or more employers. If a single employer kept withholding Social Security tax after your wages at that company already passed $184,500, that’s a payroll error, and you cannot fix it on your return.1Internal Revenue Service. Topic No. 608, Excess Social Security and RRTA Tax Withheld
Contact the employer’s payroll department and ask for a refund of the excess. The employer corrects its own records by filing Form 941-X with the IRS.8Internal Revenue Service. About Form 941-X, Adjusted Employer’s Quarterly Federal Tax Return or Claim for Refund
If the employer won’t cooperate, or the company has gone out of business, file Form 843 directly with the IRS. Attach a copy of the W-2 showing the excess withholding. If the employer is defunct and you cannot get a statement, include your own written explanation of the situation and the amounts involved.9Internal Revenue Service. Instructions for Form 843 – Claim for Refund and Request for Abatement The same three-year or two-year filing deadline applies to Form 843 claims.
Married Couples Calculate It Separately
The wage base limit applies to each person individually, not to the couple. If both spouses work and both had overpayments, each one runs the calculation on their own W-2s.1Internal Revenue Service. Topic No. 608, Excess Social Security and RRTA Tax Withheld You cannot combine your Box 4 amounts with your spouse’s and claim one big credit. Each spouse totals their own withholding, subtracts the $11,439.00 maximum, and reports their own excess. Both figures then flow into your joint Form 1040.
This trips people up when one spouse had multiple employers and the other didn’t. Only the spouse with excess withholding gets a credit. The other spouse’s withholding doesn’t enter the calculation, even though everything lands on the same return.