Form 941 vs W-2 and W-3: Year-End Reconciliation and Mismatch Fixes
Every January the same question fills payroll forums: the W-3 is ready, the four quarterly returns are filed, and the totals don't agree. Sometimes that's fine. Some differences are built into the forms, and the IRS expects them. Others mean wages or withholding were reported on one side and not the other, and those come back years later as a letter.
This guide shows exactly which W-3 boxes the IRS lines up against which Form 941 lines, works a full 2026 year with one harmless difference and one real error, and explains the letters you'll get if a mismatch slips through. For the forms themselves, see Form 941, Schedule B and 941-X in one place.
If your 941 and W-3 don't match, compare four figures: W-3 box 2 against line 3, box 3 against line 5a, box 5 against line 5c and box 7 against line 5b, using the year's four Forms 941. Wages should match. The 941 tax should be about twice W-3 boxes 4 and 6, because it includes the employer's share. Anything else needs a W-2c or Form 941-X.
941 and W-3 don't match? The crosswalk the IRS uses
The 2026 W-2 and W-3 instructions tell employers to reconcile W-3 boxes 2, 3, 5 and 7 with the yearly totals from the four Forms 941, and to check that the Social Security and Medicare tax on the 941s is approximately twice W-3 boxes 4 and 6. The IRS matching program compares the same items: income tax withheld, Social Security wages, Medicare wages and Social Security tips.
| W-3 box (total of all W-2s) | Compare with (sum of four 941s) | What a match looks like |
|---|---|---|
| Box 2, federal income tax withheld | Line 3 | Equal to the cent |
| Box 3, Social Security wages | Line 5a, column 1 | Equal |
| Box 7, Social Security tips | Line 5b, column 1 | Equal |
| Box 5, Medicare wages and tips | Line 5c, column 1 | Equal |
| Box 4, Social Security tax withheld | Lines 5a and 5b, column 2 | 941 is about twice box 4 |
| Box 6, Medicare tax withheld | Lines 5c and 5d, column 2 | 941 is about twice box 6, less any Additional Medicare Tax |
| Box 1, wages, tips, other compensation | Line 2 | Usually equal, but not one of the four items the IRS reconciles |
Sources: General Instructions for Forms W-2 and W-3 (2026), "Reconciling Forms W-2, W-3, 941..."; IRS CAWR employment tax problem inquiries (updated February 4, 2026).
Use each 941 as corrected. If you filed a Form 941-X for a 2026 quarter, its changes count toward the 2026 totals. A 941-X that fixes a 2025 or earlier quarter doesn't belong on 2026 Forms W-2 and W-3 at all; the instructions say so directly. If an employee's box 1 and box 3 differ, that's usually 401(k) deferrals or the Social Security cap at work, explained in why a pay stub and a W-2 don't match.
Worked example: reconciling a small employer's 2026 year
A small business has three employees in 2026. The manager earns $240,000 a year, paid evenly each month. Two staff members earn $45,000 and $38,000. One of them also received a $2,000 bonus on June 30, 2026, and the bookkeeper left that bonus off the second-quarter 941. There are no tips.
| 2026 Form 941 as filed | Line 2 wages | Line 3 withheld | Line 5a SS wages | Line 5c Medicare wages | Line 5d wages |
|---|---|---|---|---|---|
| Q1 | $80,750 | $12,400 | $80,750 | $80,750 | $0 |
| Q2 | $80,750 | $12,400 | $80,750 | $80,750 | $0 |
| Q3 | $80,750 | $12,400 | $80,750 | $80,750 | $0 |
| Q4 | $80,750 | $12,400 | $25,250 | $80,750 | $40,000 |
| Four-quarter total | $323,000 | $49,600 | $267,500 | $323,000 | $40,000 |
Illustrative 2026 figures. Q4 Social Security wages drop because the manager reaches the $184,500 wage base in October; Additional Medicare Tax applies to the manager's pay over $200,000 in November and December.
Now line those totals up against the W-3, which was built from the 2026 payroll register and correctly includes the bonus and the $440 of income tax withheld from it:
| Item | 2026 W-3 | Four 941s | Difference | Verdict |
|---|---|---|---|---|
| Box 2 vs line 3 | $50,040.00 | $49,600.00 | $440.00 | Error: bonus withholding never reported |
| Box 3 vs line 5a col. 1 | $269,500.00 | $267,500.00 | $2,000.00 | Error: bonus missing from Q2 |
| Box 5 vs line 5c col. 1 | $325,000.00 | $323,000.00 | $2,000.00 | Error: same bonus |
| Box 4 x 2 vs line 5a col. 2 | $33,418.00 | $33,170.00 | $248.00 | Error: 12.4% of the bonus |
| Box 6 x 2 vs lines 5c and 5d col. 2 | $10,145.00 | $9,727.00 | $418.00 | $58 is the bonus; $360 is valid |
Box 4 is $16,709.00 (6.2% of $269,500). Box 6 is $5,072.50: 1.45% of $325,000 plus $360 of 2026 Additional Medicare Tax. On the 941s, line 5c column 2 is $9,367.00 (2.9% of $323,000) and line 5d is $360.00.
The $360 is the valid difference. Additional Medicare Tax is 0.9% withheld from the employee only, with no employer match, so it shows up once on line 5d and once in box 6. Doubling box 6 doubles it, which is why the 941 side comes out $360 lower even when everything is right. Keep a note of that in your 2026 reconciliation file.
Everything else traces to the missing $2,000 bonus. The fix is a Form 941-X for the second quarter of 2026 adding $2,000 to lines 2, 5a and 5c and $440 to line 3, and paying the $746 owed ($440 plus 15.3% of $2,000). After that, every 2026 figure agrees and the W-2s don't change. Left alone, this is the pattern that produces a Letter 99C: W-2s showing more withholding than the returns paid.
Once the totals agree, you can prepare each employee's 2026 W-2 and the W-3 transmittal from your payroll records, then print and file. ePaystubs prepares the forms; it doesn't file them or make deposits for you.
Valid differences vs real errors
The instructions say amounts may not match for valid reasons, and that you should confirm the reasons are valid and keep your reconciliation in case the IRS or the Social Security Administration (SSA) asks. These are the usual suspects:
| Difference | Valid or error? | Why |
|---|---|---|
| 941 tax is about twice boxes 4 and 6 | Valid | The 941 includes the employer's matching share; the W-2 shows only what was withheld |
| 941 Medicare tax is a bit less than twice box 6 | Valid | Additional Medicare Tax is employee-only, so it isn't doubled on the 941 |
| A few cents on line 7 | Valid | Fractions-of-cents rounding between per-paycheck withholding and the quarterly calculation |
| Line 9 adjustments for uncollected tax on tips or group-term life insurance | Valid | The employee share wasn't withheld; it shows on the W-2 in box 12 instead of boxes 4 and 6 |
| Third-party sick pay on line 8 | Valid if handled per the sick pay rules | The payer withheld the employee share; reporting depends on who issues the W-2 |
| Box 2, 3, 5 or 7 doesn't equal the 941 total | Error | Wages or withholding reported on one side only, such as a bonus, a manual check or a late payroll |
| Box 3 includes more than $184,500 for one employee | Error | Social Security wages are capped at the 2026 wage base |
| Prior-year 941-X amounts included in 2026 totals | Error | Prior-year adjustments stay off current-year Forms W-2 and W-3 |
| A quarter filed under a different EIN | Error unless box h is filled in | Enter the other EIN (including a prior owner's) in W-3 box h |
The 2026 instructions add a few W-2 checks that prevent mismatches before they start: box 5 can't be less than boxes 3 and 7 combined, box 4 should be empty when boxes 3 and 7 are both zero, box 6 should be empty when box 5 is zero, and noncash pay that isn't subject to Social Security or Medicare stays out of boxes 3 and 5. For a box-by-box refresher, see every W-2 box explained.
Which form fixes which error
The question is always which side is wrong. Fix the form that has the bad number, and fix both if both are off.
| What went wrong | Fix | Timing |
|---|---|---|
| The 941 left out wages or withholding (the W-2s are right) | Form 941-X for the quarter with the error | File and pay by the due date of the return for the quarter you found it, to keep it an interest-free adjustment |
| The 941 reported too much | Form 941-X, as an adjustment or a refund claim | Within the period of limitations on credit or refund |
| A W-2 is wrong and hasn't been filed yet | Correct the W-2 before filing | By February 1, 2027 for 2026 forms |
| A W-2 is wrong and was already filed with SSA | Form W-2c to the employee and SSA, with Form W-3c | As soon as you find the error; may also need a 941-X |
| A W-2 was never filed | File the original W-2 (and a W-3 or W-3c as instructed) | Right away; late-filing penalties grow with time |
The W-2 and W-3 instructions point out that corrections on Form W-2c may also require a 941-X, since the two sides have to tell the same story. You can prepare a corrected W-2c or a Form 941-X from your records; our Form 941-X guide for 2026 walks through the adjustment and claim processes line by line. Income tax withholding errors on the 941 can generally be corrected only in the same calendar year the wages were paid, unless the error was administrative, so year-end is the last easy chance.
IRS and SSA letters when the forms don't match
A mismatch you miss doesn't surface right away. The IRS and SSA compare the two sides through combined annual wage reporting (CAWR), and the cases run years behind. According to the IRS pages updated February 4, 2026, IRS reviews start each April for the second preceding tax year, and SSA-referred cases for the third preceding year. A 2026 mismatch could reach you in 2028 or 2029.
| Notice | From | What triggered it | Response |
|---|---|---|---|
| SSA-L-93-SM, Employer Questionnaire | SSA | Social Security or Medicare wages on your W-2s are lower than on your 941s | Reply to SSA with the missing W-2s or an explanation |
| SSA-L-94-SM, Second Request Questionnaire | SSA | The first questionnaire didn't resolve it | Same; unresolved cases go to the IRS |
| Letter 98C, Wage Discrepancy per SSA | IRS | The SSA case is still open after the IRS review (tax year 2022 cases were being worked in 2026) | Within 45 days of the letter date: missing W-2s, a signed statement, or W-2c and 941-X forms |
| Letter 99C, Employment Tax Problem | IRS | An apparent underpayment of tax or over-withholding of income tax (tax year 2024 cases were being worked in 2026) | Within 45 days: a signed statement, any unfiled 941s, or corrected forms |
Sources: IRS CAWR missing Form W-2 inquiries and CAWR employment tax problem inquiries, both updated February 4, 2026.
If the IRS doesn't receive a reply to Letter 99C within 45 days, it closes the case with the information it has and bills the tax, penalties and interest. For Letter 98C, each original W-2 sent in response carries a penalty under section 6721(a), listed at $290 per form for tax year 2022, and no timely reply can bring a penalty of 10% of the total difference under section 6721(e).
When you respond, check the letter's figures against your reconciliation, attach any forms behind the letter and its response page, and make sure your corrections don't leave the account out of balance in the other direction. A payroll provider or accountant on file gets a copy too. For how the broader penalty system works, including relief requests, see Form 941 penalties and how to get them removed.
Year-end checklist before February 1, 2027
For 2026 forms, both the fourth-quarter Form 941 and the W-2s and W-3 are due February 1, 2027. That's the best time to reconcile, because you can still fix the Q4 return before you file it. Work through this list in order:
Late W-2s get expensive. For filings due after December 31, 2026, the penalty is $60 per W-2 if you file correctly within 30 days, $130 per form by August 1, and $340 per form after that or if you never file, with lower annual caps for small businesses.
Churches should note that the W-3 "941" kind-of-payer box is checked even when the church doesn't file Forms 941; see Form 941 for churches. If 2026 is your last year with employees, the final-return rules move the W-2 deadline up. The broader 2026 year-end payroll checklist covers everything else due in January.
Reconciliation claims to double-check
| What you might read | What the IRS instructions say |
|---|---|
| "Match 941 line 2 to your W-2 and W-3 totals." | The IRS list is W-3 boxes 2, 3, 5 and 7, plus boxes 4 and 6 at about half the 941 tax. Line 2 is worth a glance, but it isn't what the matching program compares. |
| "The W-3 tax boxes should equal the 941 tax." | They should be about half. The 941 includes the employer's share. |
| "Any difference means you'll get a penalty." | Some differences are valid. Document them and keep the reconciliation. |
| "Put last year's 941-X correction on this year's W-2." | Prior-year adjustments stay off current-year Forms W-2 and W-3. |
| "Fix every mismatch with a 941-X." | Only when the 941 is wrong. A wrong W-2 needs a W-2c and W-3c. |
Frequently Asked Questions
Usually one of two things. The tax boxes don't match because the 941 includes the employer's share, so it should be about twice W-3 boxes 4 and 6. If the wage or withholding boxes differ, something was reported on only one side, such as a bonus, a manual check or a prior-year correction.
Usually, because both report wages, tips and other compensation. But it isn't one of the items the IRS reconciles. The 2026 instructions focus on box 2 for withholding and boxes 3, 5 and 7 for Social Security and Medicare wages and tips, plus the tax in boxes 4 and 6.
It's the IRS notice for a combined annual wage reporting case showing an apparent underpayment of tax or over-withholding of income tax when your W-2s and 941s are compared. You have 45 days to reply. Without a reply, the IRS closes the case and bills tax, penalties and interest.
It follows SSA questionnaires when your W-2s show less Social Security or Medicare wages than your 941s, usually because W-2s are missing. You have 45 days to send the missing W-2s, a statement or corrections. In 2026 the IRS was working tax year 2022 cases.
Fix the form that's wrong. If the 941 left out wages or withholding, file Form 941-X for that quarter. If an employee's W-2 was wrong and already filed, send a W-2c and W-3c. Some errors need both, and the W-2 instructions say a W-2c may require a 941-X.
Official Sources and References
- IRS: General Instructions for Forms W-2 and W-3 (2026) (updated April 30, 2026)
- IRS: Combined annual wage reporting employment tax problem inquiries (updated February 4, 2026)
- IRS: Combined annual wage reporting missing Form W-2 inquiries (updated February 4, 2026)
- IRS: Correcting employment taxes (updated April 28, 2026)
- IRS: Instructions for Form 941 (Rev. March 2026)