Form W-2

Form W-2 is the statement an employer furnishes to each employee, and files with the Social Security Administration, summarizing a calendar year of wages, tips, other compensation, and the federal, state, and local taxes withheld from them. The legal requirement sits in section 6051(a) of the Internal Revenue Code, which is worth reading once because of what it does not say: it obliges the employer to furnish "a written statement" containing a specified list of figures, and never names a form. The IRS designed Form W-2 to satisfy that obligation, and titled it "Wage and Tax Statement." The statute's list is also where the form's most confusing feature originates, because it separately requires the total wages as defined in section 3401(a), which is the base for income tax withholding, and the total wages as defined in section 3121(a), which is the base for Social Security and Medicare tax. Those two definitions do not match, so neither do the boxes that report them.

Why Box 1 is lower than your salary, and lower than Box 3. Box 1 reports taxable wages for income tax purposes. The instructions state plainly that it does not include elective deferrals such as employee contributions to a 401(k) or 403(b) plan. Box 3 reports Social Security wages, and the instructions are equally direct that elective deferrals go in Box 3 "even though the deferrals are not includible in box 1," because a traditional deferral escapes income tax and not payroll tax. Health insurance premiums paid by salary reduction through a cafeteria plan are excluded from both. So for most people who contribute to a traditional workplace plan, Box 1 is less than Box 3, and the difference is close to the deferral. Roth deferrals behave the opposite way: they are included in Box 1 as well, because no income tax was avoided.

Box 5 has no ceiling and Box 3 does. Social Security tax stops at the annual wage base, and the instructions confirm that Boxes 3 and 7 together cannot exceed it, currently $184,500. Medicare tax has no such limit, so Box 5 keeps climbing. A high earner will therefore see Box 3 capped while Box 5 matches their full covered wages, and that is correct rather than an error.

The retirement plan checkbox in Box 13 has real consequences. The instructions say to check it if the employee was an "active participant" for any part of the year in a qualified plan, a 403(a) annuity, and several other listed arrangements. That phrase is the statutory test that determines whether the deduction for a traditional IRA contribution is subject to an income phase-out at all. Someone whose employer checked the box in error can find a deduction disallowed, and someone who ignores a correctly checked box can claim one they are not entitled to. The two neighboring checkboxes matter less often but are not cosmetic either: statutory employee changes where the wages are reported on the return, and third-party sick pay signals that a portion of Box 1 came from an insurer rather than the employer.

Where the form actually goes. Copy A is filed with the Social Security Administration, not the IRS, accompanied by Form W-3. The SSA posts the earnings to your Social Security record and passes the tax data to the IRS. Copy 1 goes to the state or locality, Copies B, C, and 2 to the employee, and Copy D stays with the employer. The routing explains something people find surprising: an unreported or misreported W-2 damages a future Social Security benefit as well as a tax return, because the benefit is computed from the earnings history the SSA built out of these forms.

What changed for 2026. Box 14 was split, with the familiar "Other" content moving to Box 14a and a new Box 14b added for the Treasury Tipped Occupation Code or Codes. Three new Box 12 codes appeared. Code TP reports the total cash tips reported to the employer and code TT reports total qualified overtime compensation, both supporting the deductions for qualified tips and qualified overtime that the 2025 tax law created for tax years beginning after 2024 and ending before 2029. They exist because those deductions are claimed on the return while the underlying amounts are known only to payroll. Code TA is unrelated to either, and reports an employer's contributions to a Trump account for an employee or an employee's dependent. Box 9 still carries no label and no entry, and it was reduced in size for 2026 to make room for the extra entry in Box 14a.

Payroll accumulates each figure through the year. In January the employer produces the form, furnishes the employee copies, and transmits Copy A to the Social Security Administration with Form W-3. Section 6051(a) fixes the employee deadline at January 31 of the following year, moving to the next business day when that date falls on a weekend or holiday, and the same date now applies to the SSA filing. The statute adds a right most people never use: an employee whose employment ended before the close of the year may make a written request and must be given the statement within 30 days, if that 30-day window closes before January 31.

A hypothetical example of the Box 1 gap. Dana's salary is $80,000. She defers $10,000 into a traditional 401(k) and pays $4,000 of health insurance premiums by salary reduction through her employer's cafeteria plan. Box 1 shows $80,000 less $10,000 less $4,000, or $66,000, because both amounts escape income tax. Boxes 3 and 5 show $80,000 less $4,000, or $76,000, because the cafeteria plan premiums escape payroll tax and the 401(k) deferral does not. The $10,000 difference between Box 1 and Box 3 is exactly her deferral, and Box 12 code D reports that same $10,000. Had she chosen Roth deferrals instead, all three boxes would read $76,000.

When a form is wrong or missing, the sequence is fixed. Ask the employer for a corrected form, which is Form W-2c. If nothing arrives by the end of February, contact the IRS. As a last resort the return can be filed using Form 4852, a substitute for Form W-2 on which you report your own best figures from pay stubs, attached to the return. Filing without the form is far better than not filing; filing with a figure you invented is not.

What it does well

• It is a single reconciled document. Wages, income tax, Social Security tax, Medicare tax, deferrals, and benefits all appear in one place with the employer on record for each figure.
• Because the SSA and the IRS both receive it, the figures on your return are verifiable rather than asserted, which is why wage income rarely draws inquiry.
• It builds your Social Security earnings record automatically, with no action required from you.
• It captures pre-tax benefit elections you may have forgotten making, which is often the fastest way to audit your own payroll deductions.

Limits and common problems

• No single box shows gross pay. Box 1, Box 3, and Box 5 are three different definitions of wages, and reconciling them to a salary figure takes arithmetic.
• It reports employment income only. Contract work, investment income, and retirement distributions arrive on other forms, so it is never a complete picture of a year.
• An error has to be fixed by the employer. You cannot correct a W-2 yourself, and Form W-2c can take weeks.
• The Box 13 retirement plan checkbox is easy for an employer to set wrongly and consequential when they do.
• It shows what was withheld, not what was owed. A large Box 2 figure is not evidence that your withholding was correct.