To file taxes with a missing W2, follow the IRS order: ask the employer, call the IRS if the form has not arrived by the end of February (February 2026 for tax year 2025 forms), and, if the deadline comes first, file using Form 4852 built from the final pay stub. If the real W-2 differs, amend.
First steps when a W-2 is missing: the employer and the payroll provider
A missing W-2 starts with the employer, because the employer issues it and the IRS expects that contact first. IRS Tax Topic 154 says to contact the employer if the W-2 is not available by February 2, 2026, the date it gives for tax year 2025 forms, or if the information on it is wrong.
Who to contact is not always obvious. Some employers have an outside payroll provider produce W-2s on their behalf, and the form may already be posted in an employee pay portal the client has forgotten about. The first questions to put to the client are simple: did they log in to their pay portal, did they move since last year, and did they change jobs during the year.
When the client or the firm contacts the employer, ask for three things:
- Whether the W-2 was issued, and when. A form that went out on time to an old address is a different problem from one that was never produced.
- The address it was sent to. A stale mailing address or an old email on file can explain a form that was issued but never seen.
- A copy, or the year-end figures. If the employer can send a copy quickly, the rest of this post is unnecessary.
Keep a record of each attempt: the date, who was contacted and what they said. The IRS Form 4852 asks on line 10 for an explanation of the efforts made to get the W-2, so notes taken now become part of the return later.
The firm also needs to know a W-2 is missing before the client mentions it. An expected-documents list built from last year's return shows each employer as its own line, so a W-2 that came in last year and not this year stands out in February. The post on tracking missing client documents explains what belongs on a client's expected-documents list, including why each employer gets a separate line.
When does the IRS step in on a missing W-2?
The IRS steps in on a missing W-2 at the end of February (February 2026 for tax year 2025 forms). IRS Tax Topic 154 says that if the form has not arrived by then, the taxpayer can call the IRS at 800-829-1040. The IRS then contacts the employer and mails the taxpayer Form 4852 with instructions.
The call needs specific information. Topic 154 lists the taxpayer's name, address with ZIP code, birthdate and taxpayer identification number, and the employer's name, address with ZIP code and employer identification number (EIN) if known. The instructions printed on Form 4852 also mention the taxpayer's phone number and dates of employment, and the employer's phone number. Having last year's W-2 on hand helps, because it carries the employer's EIN and address.
The IRS contact does not guarantee the W-2 will arrive in time. Form 4852 says that if the missing form does not come in time to file on time, the taxpayer may use the Form 4852 the IRS sent to file the return. That is the point where the work shifts from chasing the form to building a substitute for it.
Firms track this stage the same way as any other missing item: the line stays marked missing, with a note of the date the IRS was called. The tracking post's section on how often the missing-documents report should be reviewed suggests a weekly pass in season, which is often enough to catch a W-2 that has gone past the end-of-February mark.
How is Form 4852 built from pay stubs?
Form 4852 is the IRS substitute for Form W-2, Form W-2c and Form 1099-R. It is built from the client's final pay stub of the year, which shows year-to-date totals for gross pay, pre-tax deductions and each tax withheld. Those totals go on line 7; lines 9 and 10 explain their source and the efforts to get the real form.
The IRS page about Form 4852 links the current revision, dated September 2020. The form's own instructions say that if complete and accurate W-2 information is not available, the final pay stub should be used to help complete line 7. They also say to attach Form 4852 to the back of the income tax return, before any supporting forms or schedules.
The line-by-line structure, from the form:
- Lines 1 to 3: name, social security number and current address.
- Line 4: the tax year, and a check box for Form W-2 or Form 1099-R.
- Lines 5 and 6: the employer's name and address, and its TIN if known. The instructions say to use the EIN from the prior year's W-2 if the employer is the same.
- Line 7a to 7i: wages and taxes withheld, discussed below.
- Line 9: how the amounts were determined, for example from pay stubs.
- Line 10: the efforts made to get the W-2 or W-2c.
A worked Form 4852 from a final pay stub
This example uses a fictional client, Marcus Ellery, who worked all of tax year 2025 for a fictional employer, Lakeshore Supply Co., and never received a W-2. Every figure is an example. His final pay stub, dated December 26, 2025, shows these year-to-date totals:
| Pay stub item (year to date) | Amount |
|---|---|
| Gross pay | $68,400.00 |
| Pre-tax 401(k) contribution | $4,104.00 |
| Federal income tax withheld | $6,250.00 |
| Social security tax withheld | $4,240.80 |
| Medicare tax withheld | $991.80 |
| State income tax withheld (Example State) | $2,870.00 |
The line 7 figures follow the definitions in the Form 4852 instructions and the IRS General Instructions for Forms W-2 and W-3 (2026). The W-2 instructions say elective deferrals to a 401(k) are reported as social security wages even though they are not included in box 1, and that Medicare wages follow social security wages except that Medicare has no wage base limit.
| Form 4852 line | Example entry | Where it comes from |
|---|---|---|
| 7a Wages, tips, and other compensation | $64,296.00 | Gross pay minus the pre-tax 401(k) |
| 7b Social security wages | $68,400.00 | Gross pay; 401(k) deferrals stay in |
| 7c Medicare wages and tips | $68,400.00 | Same as 7b in this example |
| 7d Social security tips | $0.00 | No tips reported |
| 7e Federal income tax withheld | $6,250.00 | Pay stub |
| 7f State income tax withheld | $2,870.00, Example State | Pay stub |
| 7g Local income tax withheld | $0.00 | None on the stub |
| 7h Social security tax withheld | $4,240.80 | Pay stub; 6.2% of 7b |
| 7i Medicare tax withheld | $991.80 | Pay stub; 1.45% of 7c |
Line 9 for this example might read: "Amounts taken from the year-to-date totals on the final 2025 pay stub dated December 26, 2025." Line 10 might read: "Requested W-2 from Lakeshore Supply Co. payroll on February 4 and February 18, 2026; called the IRS on March 2, 2026." The 6.2% check on line 7h comes from the W-2 instructions' own example of the social security tax limit, and the 1.45% on line 7i is the rate the Form 4852 instructions give for Medicare tax.
The arithmetic checks are worth doing on every substitute form. If the social security tax on the stub is not 6.2% of the social security wages, or the Medicare tax is not 1.45% of Medicare wages, something is missing from the stub, such as an earlier pay period, a bonus or another deduction type.
What to do when a client's W-2 never arrives
When a client's W-2 never arrives, the IRS path is to file with Form 4852 and fix the return later if needed. IRS Tax Topic 154 says to estimate wages and withholding and report them on Form 4852. If the real W-2 arrives after filing and its figures differ, Topic 154 says to file Form 1040-X to amend the return.
The instructions on Form 4852 state the same rule more firmly. If a Form W-2 or W-2c received after filing shows that the original return was incorrect, the taxpayer must amend on Form 1040-X. They add that the taxpayer is responsible for filing an accurate return whether or not a W-2 is ever received and whether or not the forms received are correct.
Form 4852 also carries penalty language. The instructions say the IRS will challenge people who use the form to avoid or evade tax, and list possible penalties: an accuracy-related penalty of 20% of the tax that should have been paid, a civil fraud penalty of 75%, and a $5,000 civil penalty for a frivolous return or submission. A substitute built carefully from real pay stubs, with line 9 and line 10 filled in honestly, is what the form is designed for.
There are a few practical steps after filing:
- Keep the paperwork. The form tells the taxpayer to keep a copy of Form 4852 until they begin receiving social security benefits, in case there is a question about their earnings record.
- Check the earnings record. The same instructions say that after September 30 of the year following the tax year, the taxpayer can use a Social Security online account to check the wages the employer reported. For tax year 2025, that is after September 30, 2026.
- Watch for the late W-2. If the real form turns up, compare it box by box with the Form 4852 entries. The comparison works the same way as for a corrected 1099 after filing, including the Form 1040-X steps.
A W-2 for an earlier year that the client has lost is a different problem with different sources. The IRS wage and income transcript, the employer and the Social Security Administration each fill part of that gap, and the post on a missing W2 from previous years explains which source suits which need.
W-2 mistake: using a mid-year pay stub for the full year
A frequent Form 4852 mistake is building it from whatever pay stub is on hand instead of the year's last one. Only the final pay stub carries year-to-date totals for the whole year. A stub from June or September leaves out every later paycheck, so wages and withholding on the substitute form come out too low.
The Form 4852 instructions name the final pay stub for a reason. Year-to-date figures accumulate with each pay period, so any earlier stub is a partial total. A client asked for "a pay stub" in March may send the most recent one, which belongs to the new year, or whichever one came to hand.
Three checks catch most of these errors:
- The pay date. The stub's pay date should be the last one in the tax year. For a biweekly payroll, that is the final payday on or before December 31.
- The pay period count. Many stubs show the period number. A biweekly employee should be at or near 26; a stub showing 18 is from September.
- The rate checks. As in the worked example, social security tax should be 6.2% of social security wages up to the wage base, and Medicare tax 1.45% of Medicare wages. A mismatch points to missing pay or an unusual deduction.
Even the final stub can miss things. The Form 4852 instructions describe line 7a as including noncash income, reported tips and all other compensation before deductions. Pre-tax 401(k) deferrals stay out of 7a in the worked example because the W-2 instructions leave them out of box 1, which 7a stands in for. A taxable benefit the employer adds to wages at year end might not appear on a December stub. When the client had a mid-year raise, a bonus paid separately or a second job with the same employer, ask whether any pay arrived outside the regular payroll.
The firm can reduce this mistake by asking for the right document at the start. A request for "your W-2, or if it hasn't arrived, your last pay stub dated in December" is clearer than "your pay stub". Schema CPA reads pay stubs and payroll reports along with W-2s and classifies each page by issuer and period, so a June stub is labelled as June rather than passing as the year-end figure; the document categories on the homepage list the payroll documents it reads. The tax forms and payroll category covers reading the W-2 itself once it arrives.