EFW2 is the Social Security Administration's file specification for electronic W-2 wage reporting. Payroll teams and authorized submitters use it to turn approved employer and employee data into a structured wage file. The file needs both technical validation and reconciliation to payroll before release.
This page uses the tax year 2026 EFW2 specification dated July 7, 2026. Confirm the edition accepted for the actual submission period and the tax year in each employer report. An updated file layout does not convert earlier wages into the current tax year.
Choose the employer's submission method
Employers required to file at least 10 covered information returns during the calendar year generally must file electronically unless a waiver applies. Count the applicable return types together. The test is not limited to W-2 volume, and electronic filing does not necessarily require building an EFW2 file yourself.
SSA Business Services Online offers wage-file upload and online form preparation. A payroll service or authorized transmitter can also manage filing work. Choose the method according to the employer roster, source data and review process. Keep W-2 reporting with SSA separate from information returns filed through IRS IRIS. Original EFW2 files and EFW2C correction files have different structures.
Map payroll fields before generating records
Build a mapping from payroll source fields to the relevant W-2 boxes and EFW2 positions. Document each field's tax-year applicability, transformation and control total. A payroll field labeled total pay does not establish the correct federal, Social Security or Medicare wage amount.
The 2026 layout contains changes to employer and wage records and additional optional-record money fields. Compare the SSA change log with the export specification rather than carrying forward last year's positions. Money fields use implied cents without decimal punctuation. Follow each field's exact blank-filling, zero-filling and permitted-value rules; a global formatting rule cannot replace the record specification.
Use the payroll field mapping guide to keep source definitions and generated values reviewable.
Validate record length and employer boundaries
EFW2 data records contain 512 positions. Validate the prescribed character encoding and delimiter handling separately from those data positions. A spreadsheet that strips trailing blanks or changes a leading-zero identifier can damage an otherwise plausible file.
| Record | Responsibility | Review point |
|---|---|---|
| RA | Submitter | Authorized submitter identity, user ID and contact |
| RE | Employer report | Employer identity, tax year and applicable attributes |
| RW and applicable optional records | Employee detail | Correct employee fields and amount mapping |
| RT and applicable optional totals | Employer totals | Totals correspond to that employer's detail |
| RF | Final file control | Count reconciliation and no following data |
RA and RE represent different responsibilities, but a self-filer can use the same EIN for both roles. Multi-employer files need a complete report boundary for each employer. Review multiple-employer structure before combining exports.
Prove the counts and wage totals
Reconcile each report's employees and money fields to its approved payroll control sheet. Then compare the file-level count with the sum of the employer reports. A correct grand total can conceal an employee assigned to the wrong EIN.
For a fictional file containing 18 RW records for Employer A and 7 for Employer B, the total employee-record count is 25. If two B records accidentally sit inside A's report, that total remains 25 while employer reporting is wrong. Review the employer boundary and each employer's field totals, not only the final count.
State wage and state-total records have their own uses and requirements. SSA does not forward EFW2 state records to state agencies. Verify the separate state submission process instead of treating federal acceptance as state filing. The file preflight guide covers the release checks.
Use AccuWage findings to repair the source
AccuWage Online tests wage-file formatting before a separate SSA submission. Select the correct test type, retain the findings, and assign each issue to the source-data or export owner. Fix the underlying cause and regenerate the file so the release remains reproducible.
A clean formatting test is useful evidence, but it does not confirm every employee identity or every payroll fact. Use SSA's employer SSN verification guidance for the appropriate employment-related process. IRS TIN Matching for information returns should not be presented as an interchangeable wage-reporting verification service.
Retest the exact file selected for release after any changes. Record the filename, version, test result and reviewer. The AccuWage repair checklist helps track findings through closure.
Track filing, processing and employee delivery
After upload, save the SSA receipt and Wage File Identifier, compare the acknowledged file with the release record, and monitor the processing result. An interrupted session or initial upload success should not trigger an unreviewed duplicate submission. Check the existing submission history first.
The published 2026 SSA specification lists February 1, 2027 as the deadline for 2026 W-2 filing. For earlier-year work, use that year's published instructions. A W-2 filing extension through Form 8809 is nonautomatic and subject to specific criteria. A request to extend employee furnishing uses the separate applicable procedure, currently Form 15397; it is not supplied by Form 8809.
Assign employee-copy delivery its own owner and completion evidence. If SSA requests resubmission, follow the existing report's instructions. If a processed return needs correction, assess the EFW2C workflow. Preserve both outcomes using the submission evidence checklist.
Filer FAQ
Does filing fewer than 10 W-2s permit paper filing?
Count all covered information returns that must be aggregated for the electronic filing test. A small W-2 count alone does not establish paper eligibility.
Can we correct an accepted wage report by uploading the original file again?
Assess the error and processed status first. A correction to a processed report differs from a requested resubmission of an unprocessed report. Follow SSA's procedure for the actual case.
Does AccuWage submit the file?
No. Testing and submission are separate actions. Retain the test result and then the actual SSA filing acknowledgment and processing result.
Are all printed W-2 fields in the RW record?
No. Review the SSA cross-reference and applicable optional records. Field locations and valid tax years determine where each item belongs.
Does the SSA upload also furnish employee copies?
No. Track employee statement production and delivery as a separate task, even when one provider handles both services.
Official sources
- SSA EFW2 specification, tax year 2026: July 7, 2026 edition, record structure, annual changes, state-record limitations and published filing date.
- SSA AccuWage Online: Pre-submission file testing.
- IRS W-2 and W-3 instructions, 2026: Electronic filing, employee furnishing, extension and correction responsibilities.
Prepare your organization's next filing
Review BoomTax's filing options for your forms, reporting year, and workflow. Keep federal submission, applicable state reporting, and recipient furnishing on your release checklist.
