Form W‑3SS – How to File Territory W‑2 Totals (AS, GU, CM, VI)

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Form W-3SS is easy to misread as just another IRS form. It is not filed with the IRS at all. It is the paper transmittal that carries your territory W-2 totals, the W-2AS, W-2GU, W-2CM, and W-2VI, to the Social Security Administration, and it is never sent by itself and never sent at all when you file electronically through SSA Business Services Online.

If you do go paper, the Copy A PDFs on IRS.gov are informational only; you need the SSA-scannable red-ink forms or approved substitutes, and Box c must equal the number of W-2 forms attached. Any employer with 10 or more total information returns must e-file. For 2025 wages the SSA deadline is February 2, 2026, since the statutory January 31 date falls on a weekend.

Key Takeaways

• Form W‑3SS is the transmittal that summarizes your W‑2AS, W‑2GU, W‑2CM, and W‑2VI totals for the Social Security Administration. Think of it as the cover sheet that carries the combined wages, Social Security and Medicare wages and tax, and federal income tax withheld for your territory employees.
• The due date for filing 2025 Forms W‑2AS, W‑2CM, W‑2GU, W‑2VI and the W‑3SS with SSA is Monday, February 2, 2026, since the statutory January 31 date falls on a weekend. Keep your calendar honest.
• If you file 10 or more total information returns, you must e‑file. The IRS final regulations lowered the threshold and SSA’s employer pages reflect this requirement, so plan for BSO access well before January.
• Copy A PDFs on IRS.gov are informational. If you choose paper, you must use the SSA‑scannable red‑ink forms or approved substitutes. Otherwise, file electronically through BSO.
• Corrections use Form W‑2c for each employee and a consolidated Form W‑3c to transmit the corrected totals. File corrections the same way you filed the original, electronic with electronic, paper with paper.

What Form W‑3SS is and how it works

Form W‑3SS is the transmittal for U.S. territory wage statements. It accompanies the territory W‑2 variants, which are:

• W‑2AS for American Samoa
• W‑2GU for Guam
• W‑2CM for the Commonwealth of the Northern Mariana Islands
• W‑2VI for the U.S. Virgin Islands

You total the figures from those W‑2s and report them on W‑3SS, then submit the package to SSA, not the IRS, even though W‑3SS is an IRS form; the SSA processes it and forwards the wage data to the IRS. The IRS’s 2025 General Instructions treat W‑3SS as part of the W‑2 and W‑3 family, and they confirm the territory scope.

A quick nuance for CNMI filers. SSA’s recent policy update notes that the 10‑return e‑file mandate applies to W‑2, W‑2AS, W‑2GU, and W‑2VI, not W‑2CM. CNMI employers should still review local CNMI guidance for W‑2CM specifics while using W‑3SS to transmit as instructed. When in doubt, confirm with CNMI’s Division of Revenue and Taxation.

Who must file and when

If you issue any of the territory W‑2 variants above, you file a paper Form W‑3SS to transmit Copy A to SSA. The W‑3SS is required only for paper filings: if you submit the territory W‑2s electronically through SSA, do not file a separate Form W‑3SS at all, because the transmittal totals are already captured in your electronic submission. Household employers and small shops are not exempt from the transmittal, and you must use a Form W‑3SS even if only one paper territory W‑2 is being filed. Keep a copy for at least four years.

Deadlines to remember:

• 2024 wage year filings were due January 31, 2025.
• 2025 wage year filings are due Monday, February 2, 2026. Mark this now, then build your internal cutoff dates for reconciliations and approvals one to two weeks earlier.

Electronic filing threshold:

• If you have 10 or more total information returns, you must file electronically unless the IRS grants a waiver. This threshold is combined, so count all your information returns, not just W‑2s.

What you need on W‑3SS

W‑3SS captures your employer identity and the aggregated numbers that match the territory W‑2s you are transmitting.

Employer and EIN details

• Legal name and full mailing address exactly as registered with the IRS, including ZIP code and the correct territory designation.
• Your nine‑digit EIN, formatted XX‑XXXXXXX, which must match your employment tax returns.
• A contact person with phone and, ideally, an email so SSA can reach someone fast if validation flags an issue.
• The total number of W‑2AS, W‑2GU, W‑2CM, and W‑2VI attached to this transmittal, excluding voids (this is a count of forms, not employees, so an employee with two W‑2s under one EIN counts as two forms).

Pro tip, if you filed Form 944, use the “944” checkbox in box b. This small checkbox prevents reconciliation confusion later.

Wage and tax totals that must reconcile

Enter the aggregated totals for:

• Federal income tax withheld
• Social Security wages and tax
• Medicare wages and tax

Your W‑3SS totals should reconcile to the sum of the attached W‑2AS, W‑2GU, W‑2CM, and W‑2VI. Keep a simple reconciliation worksheet that ties W‑3SS back to payroll and to Forms 941, 943, or 944 as applicable. If totals do not match, expect follow‑up and keep the reconciliation support handy.

Include any required aggregates for box 12 codes and territory state or local boxes, when applicable. Use a separate W‑3SS for each territory if you file for multiple territories.

Which copy to use

If you still file on paper, you must use the SSA‑scannable, red‑ink Copy A pages or an approved substitute. The PDF on IRS.gov is for reference, not for mailing, and a penalty may be imposed for filing paper Copy A forms that cannot be scanned, including Copy A printed from the IRS PDF on plain paper. Electronic filers will transmit through BSO instead.

How to file W‑3SS, electronic vs paper

Short answer, e‑file whenever possible. It is faster, it reduces data entry errors, and it gives you an immediate receipt. Since the 10‑return rule kicked in, most employers must e‑file anyway.

Get BSO access set up early

Business Services Online is where you key in W‑2s, upload EFW2 files, test with AccuWage Online, and retrieve confirmations.

Set up checklist:

• Create or use your Login.gov or ID.me credential, Social Security usernames no longer work.
• Register for BSO, then wait for the activation code that SSA mails to the address the IRS has on file for your EIN. Allow roughly two weeks and do this before January. Activation codes are time sensitive.
• Link your existing BSO User ID to your new credential after you receive the code.

Need help during setup, call SSA’s Employer Reporting Service Center at 800‑772‑6270, or the BSO technical line at 888‑772‑2970. Save these in your contacts before peak season.

Prepare the file and validate with AccuWage Online

If you upload rather than key each form, build an EFW2 file from your payroll system. Before you send anything, run the file through AccuWage Online to catch formatting errors. It is free and lives inside BSO. This five‑minute check can save you a rejected file on January 31.

Upload options inside BSO:

• W‑2 Online, enter the forms directly, good for very small volumes, with a cap of 50 forms per submission, beyond which you must use File Upload.
• EFW2 upload, best for larger volumes from QuickBooks, Thomson Reuters, CCH, or your payroll engine.

What to keep after you submit:

• BSO submission receipt and confirmation number.
• A PDF or export of the accepted W‑2AS, W‑2GU, W‑2CM, W‑2VI and the W‑3SS image if available.
• Your reconciliation tie out. Keep all of it for at least four years.

Paper filing, if you qualify and must

Some employers still qualify to paper file. If you are under the 10‑return threshold and do not e‑file, use only scannable red‑ink forms, flat mailers, and do not staple or fold. Use a separate W‑3SS for each territory, for example send W‑2GU with one W‑3SS and W‑2AS with another. Follow the SSA mailing addresses provided in the current instructions. If something feels off, reconsider e‑file or request an e‑file waiver with Form 8508 ahead of time.

Extensions, only when needed

• Filing with SSA, you may request one 30‑day extension using Form 8809, but the IRS grants it only in limited cases. Submit at least 45 days before the due date when possible. This does not extend the deadline to furnish employee copies.

Corrections, penalties, and recordkeeping

Mistakes happen. When they do, fix them cleanly and document your trail.

The correction flow that works

• Identify the error, for example wages, tax withheld, or an EIN mismatch.
• Prepare a W‑2c for each affected employee.
• Prepare a W‑3c that summarizes all the W‑2c corrections.
• File corrections through the same channel as the original, electronic if electronic, paper if paper.
• Keep all receipts, versioned files, and a short memo that explains the reason for the correction.

Penalties and prevention:

• The IRS can assess per‑form penalties for late, incorrect, or missing W‑2s and the matching W‑3SS. The easiest way to avoid penalties is to e‑file on time, validate your file, and reconcile totals to your payroll returns before you submit. For volume filers, the 10‑return rule makes e‑file mandatory, so skipping BSO can create an extra penalty risk.

Record retention:

• Keep W‑3SS copies, W‑2AS, W‑2GU, W‑2CM, W‑2VI, reconciliation workpapers, and BSO confirmations for at least four years. That is straight from the territory form instructions.

Territory specifics and common mix‑ups

A little clarity here saves hours in review.

Know your territory forms

• American Samoa, use W‑2AS, transmit with W‑3SS.
• Guam, use W‑2GU, transmit with W‑3SS.
• CNMI, use W‑2CM, transmit with W‑3SS and confirm CNMI filing guidance for any local nuances, including the fact that for the territorial copy the CNMI uses its own Form OS‑3710 instead of W‑3SS Copy 1. The IRS and SSA materials recognize W‑2CM, and SSA’s policy note clarifies how the 10‑return rule is applied.
• U.S. Virgin Islands, use W‑2VI, transmit with W‑3SS.
• Puerto Rico, do not use W‑3SS. Puerto Rico uses Form W‑3PR to transmit Form 499R‑2/W‑2PR. Different rules apply, and PR has its own instructions.

Quick comparison table

Territory or jurisdiction	Employee form	Transmittal	Notes
American Samoa	W‑2AS	W‑3SS	Covered by W‑2 and W‑3 general instructions for territory forms.
Guam	W‑2GU	W‑3SS	Use separate W‑3SS for each territory if filing across more than one.
CNMI	W‑2CM	W‑3SS	Confirm CNMI specifics. SSA policy notes e‑file threshold treatment differs for W‑2CM.
U.S. Virgin Islands	W‑2VI	W‑3SS	Same SSA due date as other territory W‑2s.
Puerto Rico	499R‑2/W‑2PR	W‑3PR	Separate instruction set, not W‑3SS.

The top mistakes reviewers still catch

• Totals on W‑3SS do not equal the sum of attached territory W‑2s. Run a quick pivot or subtotal before you submit.
• Using the informational PDF for Copy A and mailing it. SSA scanners reject these, use the red‑ink forms or e‑file.
• Waiting until late January to register for BSO. You will need an activation code mailed to the IRS address on file for your EIN. Build that two‑week window into your timeline.
• Mixing territories on one W‑3SS. File a separate transmittal for each territory.
• Skipping AccuWage, then getting an avoidable reject on January 31. Test the file first.

Step‑by‑step, from data to submission

• Pull year‑end payroll data by territory and by EIN.
• Generate W‑2AS, W‑2GU, W‑2CM, W‑2VI from your payroll system.
• Reconcile the territory totals to your quarterly or annual employment tax returns, then tie those to the W‑3SS lines.
• Prepare the W‑3SS with employer identity, contact, the total W‑2 count, and aggregate wages and tax.
• If e‑filing, format the EFW2 file and test in AccuWage Online. Upload in BSO and download the receipt.
• If paper filing, use the red‑ink forms, do not staple or fold, and mail flat. Keep tracking and a full copy set.
• Store confirmations and the reconciliation workpapers. Keep everything for four years.

Quality tips that cut review time

When I review territory packages, the same habits always win.

• Use one standard folder structure per territory with subfolders for W‑2 images, the W‑3SS, reconciliation, and BSO receipts.
• Save a one‑page reconciliation that shows totals by W‑2 box for each territory and the exact W‑3SS line it ties to, reviewers love this.
• Document any oddities, for example a late new EIN, a merger, or a third‑party sick pay recap. A two‑sentence note can prevent back‑and‑forth during the crunch.
• Test EFW2 files in AccuWage Online before the upload, then upload early in the day in case you need to correct and resubmit.

If your firm handles dozens of territory filings, structure matters. Dedicated checklists, standardized workpapers, and early BSO credential checks prevent last‑minute scrambles. If you need help building that discipline, Accountably integrates standardized workpapers, review layers, and turnaround SLAs without forcing you to change your tax stack, which keeps territory filings predictable and on time.

Printable mini‑checklist

• Confirm territory scope, W‑2AS, W‑2GU, W‑2CM, W‑2VI, and use separate W‑3SS for each.
• Verify employer legal name, address, and EIN match IRS records.
• Reconcile payroll totals to W‑2 boxes and to 941, 943, or 944 where applicable.
• Prepare W‑3SS with counts and aggregates that tie to the W‑2s.
• E‑file through BSO if you meet the 10‑return rule or choose e‑file for speed, keep the confirmation.
• If paper filing, use SSA‑scannable red‑ink forms and a flat mailer.
• If errors are found, issue W‑2c for each employee and a W‑3c for the batch, then file corrections the same way you filed the original.
• Retain everything for four years.

Quick glossary

• W‑3SS, the SSA transmittal that summarizes W‑2AS, W‑2GU, W‑2CM, W‑2VI.
• W‑2AS, American Samoa wage statement.
• W‑2GU, Guam wage statement.
• W‑2CM, CNMI wage statement.
• W‑2VI, U.S. Virgin Islands wage statement.
• AccuWage Online, SSA tool that checks your EFW2 file before you submit.
• BSO, Business Services Online, the SSA portal for filing and confirmations.

Final word

You do not need a complicated playbook to get W‑3SS right. Start your BSO access in December, reconcile early, test your file, and file a few days before the deadline so you have room to breathe. If a correction is needed, fix it quickly with W‑2c and W‑3c and keep clean records.

This guide reflects IRS and SSA guidance available as of November 28, 2025. Always confirm the due date and e‑file requirements in the current year’s instructions before you submit.

If your team wants standardized checklists, file naming, and review layers that fit your current systems, our team at Accountably can help you build a disciplined delivery process that keeps W‑3SS filings accurate and on time, season after season.

Common Mistakes We See Every Season

After years of reviewing territory wage packages, I see the same short list of W-3SS errors resurface every January, and each one is preventable with a single checkpoint in your SOP.

Reusable Checklists

These checklists are copy-paste ready for your firm's SOP library. Drop them into your year-end workflow and tick each item as territory filings move from payroll data to an accepted SSA submission.

Keep W3SS Season From Stalling

Territory wage filings bunch up against a single hard date. For 2025 wages, the W-2AS, W-2GU, W-2CM, and W-2VI forms and the W-3SS transmittal are all due to SSA by February 2, 2026, and the same window demands live BSO credentials, reconciled box totals, and a clean Box c count. When that work slides into the last week of January, small reconciliation gaps turn into W-2c and W-3c rework.

The cost of slipping is concrete. The section 6721 penalty for a late or incorrect information return reaches $340 per form for returns due in 2026, and since T.D. 9972 lowered the e-file threshold to 10 aggregate information returns, most filers no longer have a paper escape hatch. The answer is not heroics in January, it is structure built in December.

• Stand up BSO access and run a test EFW2 file through AccuWage well before the February 2 cutoff.
• Reconcile Box 1 through Box 7 on each territory W-2 set to Forms 941, 943, or 944 before totals reach the W-3SS.
• Verify Box c equals the attached Copy A count and that only one Box 18 Type of Form is checked per transmittal.
• Separate CNMI W-2CM handling so Form OS-3710 goes to the territory while W-3SS Copy A goes to SSA.

That structure is exactly what we build for filers working across multiple territories. Accountably layers standardized workpapers, a multi-step review, and turnaround SLAs onto your existing payroll and tax stack, so W-3SS season stays predictable. See how our tax preparation services keep territory filings accurate and on time.

FAQs

What is the due date for W‑3SS this season?

For 2025 wages, file with SSA by Monday, February 2, 2026. The weekend pushes the statutory January 31 deadline.

Do I still file a W‑3SS if I e‑file through BSO?

No. When you submit the territory W‑2s electronically through SSA Business Services Online, the transmittal totals are already captured in your electronic submission, so a separate Form W‑3SS is not required. BSO gives you a confirmation instead.

What is the difference between W‑3, W‑3SS, and W‑3PR?

• W‑3 is the transmittal for U.S. W‑2.
• W‑3SS is the transmittal for the territory W‑2 forms, W‑2AS, W‑2GU, W‑2CM, and W‑2VI.
• W‑3PR is only for Puerto Rico’s 499R‑2/W‑2PR.

Does the 10‑return e‑file rule apply to territory W‑2s?

Yes for W‑2, W‑2AS, W‑2GU, and W‑2VI, which are treated as W‑2s for this purpose. SSA’s policy update explains the scope and notes a different treatment for W‑2CM.

How do I get BSO access if I am new?

Create a Login.gov or ID.me account, register for BSO, then wait for the mailed activation code sent to the IRS address for your EIN. Allow around two weeks and finish activation before January.