Guam has started coming up in discussions. Perhaps because you’re expanding across U.S. territories. Or you found a standout candidate already based in Hagåtña. However it happened, you’ve moved past the idea stage. Now, you’re thinking about payroll, and the details are piling up.
On paper, Guam looks similar to the mainland U.S. The tax code mirrors federal law, and the forms sound familiar. But the agencies, filing destinations, and wage statements are different enough that you can’t run this on autopilot.
So let’s walk through what actually matters when you hire and pay employees in Guam. Clear steps. No noise.
Strategic overview
When you run payroll in Guam, you’re managing three core obligations: income tax withholdings administered locally, federal FICA taxes, and unemployment reporting.
Guam follows what’s known as a mirror tax code. In plain terms, Guam’s income tax system mirrors the U.S. Internal Revenue Code (IRC), but income taxes on wages earned for services performed in Guam are generally paid to Guam instead of the Internal Revenue Service (IRS).
That one shift changes where you register, where you deposit withholdings, and which wage statements you issue at year's end. It also changes how you think about payroll tax compliance from day one.
Guam payroll and taxes at a glance
Before your first pay run, separate three buckets in your mind: employee withholdings, employer payroll taxes, and business taxes that are not payroll at all.
Employee withholdings typically include:
- Guam income tax withheld on wages for services performed in Guam and remitted to the Guam Department of Revenue and Taxation
- Social security tax at 6.2 percent up to the annual wage base
- Medicare tax at 1.45 percent, plus Additional Medicare Tax for high earners
You can confirm the current FICA percentages directly in the official federal guidance.
Employer payroll taxes generally include:
- Employer share of Social Security at 6.2 percent
- Employer share of Medicare at 1.45 percent
- Unemployment contributions under Guam’s unemployment system
Business taxes, such as gross receipts tax, are separate from payroll. Keep them separate operationally, too.
Why Guam payroll looks like the U.S. but is not identical
Because Guam mirrors the IRC, you’ll recognize the structure of withholding tables and familiar concepts like employee elections.
But wage reporting differs. Wages subject to Guam income tax withholdings are generally reported on Form W-2GU rather than the standard Form W-2.
Mirror does not mean identical. It means similar rules, different administration.
What counts as wages in Guam for payroll purposes
For payroll, the most important question is simple: Where is the employee physically working?
If your employee performs services in Guam, those wages are generally subject to Guam income tax withholdings.
Edge cases come up fast:
- An employee based in Texas spends several months working on site in Guam
- A Guam resident splits time between Guam and the U.S. mainland
- A remote worker relocates mid-year
In each case, you need to track days worked in Guam and allocate wages if required.
Setting up Guam payroll before you hire
You do not want your first payroll run to double as your first compliance experiment.
Employer registration and payroll accounts
If you are operating through your own Guam entity, you’ll register with the Guam Department of Revenue and Taxation for employer withholdings.
You should also confirm unemployment registration requirements through the Guam Department of Labor.
Choose the payroll approach that fits your situation
You have three realistic paths:
- Run payroll through your own Guam entity
- Work with a payroll processor that supports Guam
- Use an employer of record (EOR)
If you want a deeper look at compliance beyond payroll, review our guide to hiring in Guam.
Guam income tax withholdings
Each pay period, you calculate gross wages, apply the employee’s withholding elections, and determine the Guam income tax to withhold using the applicable tables.
If an employee earns US$5,000 in a month for services performed in Guam, your payroll system calculates Guam income tax withholdings, withholds FICA, and reflects both on the pay stub. That withheld Guam income tax is deposited with Guam, not the IRS.
Consistency matters. Small manual overrides can create reconciliation issues at quarter-end.
Deposits and timing
Build a repeatable payroll workflow:
- Calculate gross wages and taxable wages
- Apply Guam income tax and FICA accurately
- Remit withheld amounts on time
- Save confirmations and payroll summaries
Late deposits often trigger penalties and interest.
Social Security and Medicare on the Guam payroll
FICA taxes apply in Guam the same way they apply in the mainland U.S.
You withhold 6.2 percent for Social Security up to the annual wage base and 1.45 percent for Medicare, and you match both amounts as the employer. The annual wage base and rate updates are published by the Social Security Administration.
Your payroll system should clearly separate employee withholdings from employer expenses.
Federal unemployment tax and Guam unemployment reporting
Federal Unemployment Tax Act obligations may apply depending on your payroll size and wage thresholds. At the same time, Guam operates its own unemployment insurance program with employer contribution requirements.
Confirm your assigned contribution rate and reporting frequency directly through the Guam labor authorities before your first quarter closes.
Quarterly filings you should plan around
Payroll compliance runs on a quarterly rhythm.
Employer quarterly Guam tax return
Each quarter, you report total wages paid and Guam income tax withheld. Before filing, reconcile payroll reports, withholding totals, and deposits.
Quarterly wage reporting
Quarterly wage reports support unemployment tracking and feed directly into your year-end wage statements.
Year-end reporting: W-2GU, W-3SS, and e-filing
Form W-2GU
Use Form W-2GU to report wages subject to Guam income tax withholdings. If wages are subject to U.S. federal income tax withholdings instead, you generally issue a standard Form W-2.
W-3SS and transmittals
Form W-3SS acts as a transmittal summarizing the wage statements you submit.
E-filing expectations
E-filing requirements often apply once you cross certain filing thresholds.
Paying residents, nonresidents, and split-location workers
When employees move between jurisdictions, focus on where the work is performed, where the employee is a tax resident, and what documentation supports your allocation.
Contractors in Guam: when it works and when it backfires
Before labeling someone a contractor, review the level of control, integration into your business, and economic dependence.
Tips and resources for a successful payroll setup in Guam
Review official registration guidance before your first payroll. Keep a shared compliance folder for registrations, deposits, and quarterly returns. Run a mock payroll cycle to confirm calculations.
Utilizing support from EOR providers
An EOR is a third party that becomes the legal employer of your worker in Guam while you manage their day-to-day responsibilities. If you don’t want to form a Guam entity, working with an EOR in Guam can eliminate incorporation, registration, and ongoing payroll administration tasks.
If you expect to expand beyond one jurisdiction, partnering with global payroll specialists also matters. Pebl's global payroll services help you manage multi-country payroll with one consistent process.
What this means for your business
You want to hire great people in Guam. And once they’re on your team, you want payroll to run cleanly—quietly, in the background, the way good systems do.
And there are a couple of ways to get there.
You can build the infrastructure yourself. Set everything up carefully. Keep track of the forms. Reconcile the numbers every quarter.
Or, you can partner with experts who already know the terrain.
Pebl supports companies expanding globally through our global Employer of Record (EOR) service. The idea is simple: We combine local insight with structured processes to handle all the mechanics of employment. And you simply hire in Guam without second-guessing which form goes where or which agency expects what. You focus on the people and building your team.
If you want to learn more, reach out today.
This information does not, and is not intended to, constitute legal or tax advice and is for general informational purposes only. The intent of this document is solely to provide general and preliminary information for private use. Do not rely on it as an alternative to legal, financial, taxation, or accountancy advice from an appropriately qualified professional. The content in this guide is provided “as is,” and no representations are made that the content is error-free.
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