Updated October 17, 2026. Quick answer: Box 3 of Form W-2 shows the wages your employer paid that are subject to social security tax, counted before payroll deductions. It can be higher than box 1 because elective deferrals are reported in box 3, and it can be lower than box 5 because of the social security wage base. The instructions say boxes 3 and 7 together cannot exceed the wage base for the year.
What box 3 reports
The employer-side instructions define the box this way: “Show the total wages paid (before payroll deductions) subject to employee social security tax but not including social security tips and allocated tips.” The words “before payroll deductions” matter for an employee: box 3 is a gross figure for social security purposes, so look at the exceptions in the instructions before assuming a paycheck deduction lowers box 3.
Noncash pay is part of it as well: “Generally, noncash payments are considered to be wages.” The social security tax that was actually withheld on these wages is a different number, shown in box 4 and explained on the box 4 page. Tips have their own box, described on the box 7 page, and the full set of boxes is laid out in the W-2 boxes 1 to 8 guide.
Why box 3 can be higher than box 1
The main reason is deferrals. The instructions say: “Report in box 3 elective deferrals to certain qualified cash or deferred compensation arrangements and to retirement plans described in box 12 (codes D, E, F , G, and S) even though the deferrals are not includible in box 1.” “Also report in box 3 designated Roth contributions made under a section 401(k) plan, under a section 403(b) salary reduction agreement, or under a governmental section 457(b) plan”.
A deferral therefore lowers box 1 but not box 3. If you contributed to a 401(k), compare your box 12 codes with these rules. The codes are explained on the box 12 codes page, and the limits that apply to those contributions are on the 401(k) contribution limits page.
Other items the box 3 instructions include
The instructions add a bulleted list, introduced by “Wages reported in box 3 also include:” The table sets the entries most employees will recognize next to the instruction text.
| Kind of pay or deduction | What the box 3 instructions say |
|---|---|
| Deferrals into a 401(k), 403(b), 457(b) or similar plan | “Report in box 3 elective deferrals to certain qualified cash or deferred compensation arrangements” |
| Designated Roth contributions | “Also report in box 3 designated Roth contributions made under a section 401(k) plan” |
| Signing bonuses | “Signing bonuses an employer pays for signing or ratifying an employment contract.” |
| Taxable group-term life insurance cost | “Taxable cost of group-term life insurance over $50,000 included in box 1.” |
| Pay from salary reduction under a SEP or SIMPLE IRA | “Salary reduction contributions under a SEP arrangement or SIMPLE IRA plan.” |
| Social security tips and allocated tips (excluded from box 3) | “but not including social security tips and allocated tips” |
The HSA entry has a limit worth reading closely: “Employee and nonexcludable employer contributions to an MSA or HSA. However, do not include employee contributions to an HSA that were made through a cafeteria plan.” If your HSA contribution came out of your paycheck through a cafeteria plan, that line says it is not part of box 3.
The wage base limit and what to check on your form
The instructions set a ceiling on the box: “The total of boxes 3 and 7 cannot exceed $176,100 (2025 maximum social security wage base).” That sentence is written to the employer, but it gives you a check. Add your box 3 and box 7 amounts. If the total is above the wage base printed in the instructions for your tax year, ask your employer to review the form. The wage base for later years is covered on the social security wage base page.
Box 3 and box 5 diverge once pay passes the base. The box 5 instructions give an example: “You paid your employee $199,750 in wages.” “Enter in box 3 (social security wages) 176100.00, but enter in box 5 (Medicare wages and tips) 199750.00.” The mechanics for box 5 are on the box 5 page.
Box 3 compared with box 1 and box 5
Three relationships cover most W-2s. Where there are elective deferrals, box 3 is above box 1. Where wages are below the base, the instructions say “If the amount of wages paid was $176,100 or less, the amounts entered in boxes 3 and 5 will be the same.” Where wages are above the base, box 3 stops at the base and box 5 keeps going. The side-by-side view is on the box 1 vs box 3 vs box 5 comparison, and the box 1 page covers the other end of the comparison.
Edition and box numbers
The primary read for this page is the 2025 edition of Form W-2, the one an employee receives in early 2026 for tax year 2025. The printed form carries the line “Wage and Tax Statement 2025”, and the matching General Instructions for Forms W-2 and W-3 (2025) were read alongside it. The 2026 edition of the form and of the General Instructions was the current one irs.gov was serving on 2026-10-17, and both were compared. The box 3 wording is the same in both editions except the wage base. The 2025 General Instructions say “The total of boxes 3 and 7 cannot exceed $176,100 (2025 maximum social security wage base).” The 2026 edition says “The total of boxes 3 and 7 cannot exceed $184,500 (2026 maximum social security wage base).” Box 3 is box 3 in both editions. Check the tax year printed on the form you received, because the figures and wording on your copy come from that year’s edition, and the box numbers on your copy are the ones to follow.
Common mistakes
- Treating box 3 as the same number as box 1. The instructions say deferrals go in box 3 “even though the deferrals are not includible in box 1”.
- Ignoring the limit. The instructions say “The total of boxes 3 and 7 cannot exceed” the maximum wage base, so a total above it is worth raising with your employer.
- Expecting a deduction to lower box 3. The box is defined as wages paid “(before payroll deductions)”, with the specific exceptions the instructions list.
Related: the social security wage base, 401(k) contribution limits, W-2 box 12 codes explained, and W-2 box 12 vs box 1.
Sources
- General Instructions for Forms W-2 and W-3 (2025): IRS archived PDF (irs.gov)
- General Instructions for Forms W-2 and W-3 (2026): https://www.irs.gov/pub/irs-pdf/iw2w3.pdf
- Form W-2, Wage and Tax Statement (2025), with the Notice to Employee and Instructions for Employee: IRS archived PDF (irs.gov)
Read from the IRS documents linked above on October 17, 2026. General information, not tax advice. Your own facts decide the outcome, and a preparer, the account provider or the IRS is the right place to confirm anything consequential.