2027 U.S. territory tax guide
2027 Guam Tax Changes: territory tax guide and official update path
Guam is not a state tax system. Its locally administered territorial income-tax framework, local filing routes, wage reporting, residency facts, and current Department of Revenue and Taxation instructions need to be considered before a 2027 filing or planning conclusion is made.
Use current territory and IRS releases to confirm final 2027 forms, instructions, deadlines, and payment details before filing or making a tax decision.
Connected 2027 guide library
Start with the 2027 territory, federal, or state question that fits your next decision.
These territory guides are separate from the completed 50-state system. Compare summaries with current territory and IRS materials, then recheck once official 2027 annual updates post.
Core answer
Start at the territorial administration level. Guam uses a mirror-code framework administered locally by the Guam Department of Revenue and Taxation (DRT); it is a U.S. territory system, not a state tax system. DRT provides e-services and public notices that include the filing pathways for Guam Gross Receipts Tax (GRT), the Social Welfare and Insurance Contribution Act (SWICA), employer W-1, W-3/W-2GU, and 1099 submissions. For employer reporting, the IRS Form W-2GU page says employers should use that form to report Guam wages and directs readers to the current W-2 and W-3 instructions maintained by the IRS. Understand the federal connection as fact-dependent. IRS Publication 570 contains the sections on Guam residence, source of income, and filing information that interact with the territorial framework. How federal provisions apply in Guam depends on the mirror-code process and on which federal changes the local administration incorporates; you should not assume a particular federal outcome will produce a specific local result without the current official documents. What remains pending for 2027 are the annual specifics that DRT and the IRS publish each year: updated forms, applicable rates, filing thresholds, and official filing dates. Official next steps: monitor Guam DRT’s e-services and public notices for local releases and check IRS Publication 570 and the W-2GU page for federal guidance before preparing or submitting territory filings.
What Guam has confirmed and what needs an official 2027 update
Guam uses a territorial mirror-code framework administered locally rather than an ordinary state-plus-federal filing setup. The Guam Department of Revenue and Taxation publishes local e-services and public notices and maintains filing paths for items such as the gross receipts tax, SWICA contributions, W-1 employment reporting, W-3/W-2GU wage reporting, and 1099-style informational returns. The IRS also provides territory-specific guidance: Publication 570 contains sections on Guam residence, source of income, and filing information. For 2027 filing decisions, confirmed local and IRS instructions control annual details, so taxpayers and employers should base choices on the current materials those agencies publish. Do not rely on presumptions about next-year forms, rates, thresholds, or deadlines until official 2027 updates are posted.
Employers who pay wages sourced to Guam should follow the guidance the IRS provides about Form W-2GU and the related W-2 and W-3 instructions. The IRS Form W-2GU page confirms that employers use that form to report Guam wages and directs readers to the current W-2/W-3 instructions for details on reporting. Locally, the Guam Department of Revenue and Taxation publishes electronic filing options and public notices that include paths for W-3 and W-2GU submissions. Because annual reporting details can change, the right decision path for payroll reporting depends on the current IRS and Guam DRT instructions; do not assume any 2027 reporting format, filing date, or amount until those agencies issue official updates. Check the current IRS Form W-2GU page and Guam DRT e-services for any posting of updated filing procedures.
Businesses and payers should note that Guam Department of Revenue and Taxation provides local e-services and public notices for nonwage and business filings, including the gross receipts tax (GRT), SWICA-related filings, and information returns analogous to 1099 forms. Those local paths are the place to begin if you need to submit business taxes or informational returns for Guam-source payments. For questions about residence, source of income, or whether a payment counts as Guam-source, IRS Publication 570 includes sections that address Guam-specific residence and source-income issues and filing information. Annual amounts, filing thresholds, return formats, and due dates can change, so rely on the current Guam DRT and IRS instructions rather than on presumptions about 2027.
Individuals deciding whether they are Guam residents, where income is sourced, and how to file should consult both Guam and IRS guidance. The IRS Publication 570 explicitly includes Guam-specific sections on residence, source of income, and filing information that help identify how federal residency concepts interact with Guam situations. At the same time, Guam operates a local mirror-code framework administered through the Guam Department of Revenue and Taxation, which publishes e-services and public notices addressing local reporting expectations. Because residence and source determinations can affect filing choices, rely on the current IRS Publication 570 language and Guam DRT announcements for each tax year. Do not treat any pre-2027 material as definitive for 2027 without official updates.
When choosing where to look for official forms, filing portals, or changes, start with the Guam Department of Revenue and Taxation’s published e-services and public notices because those local channels list the filing paths for GRT, SWICA, employer W-1 reporting, W-3/W-2GU wage filings, and informational returns similar to 1099s. For interpreting residency, source, and filing thresholds, pair those local resources with the relevant sections of IRS Publication 570. The IRS Form W-2GU landing page also advises employers to consult current W-2 and W-3 instructions. Because each filing year can present updated formats, deadlines, or instructions, make decisions for 2027 only after confirming the official materials that Guam DRT and the IRS publish for that year.
Guam territorial tax administration, mirror-code context, and local DRT routes
Guam operates under a territorial mirror-code framework administered locally rather than through an ordinary separate federal-and-local filing setup. The Guam Department of Revenue and Taxation maintains e-services and posts public notices that are the primary local contacts for taxpayers and preparers; those DRT pages list filing paths and procedures for local forms such as the GRT, SWICA filings, the W-1, the W-3/W-2GU, and 1099 series submissions. Employers handling Guam wages should consult the IRS W-2GU page, which identifies that form for Guam reporting and points to the current W-2 and W-3 instructions. For any filing season, check both the DRT e-services/notices and the IRS Publication 570 sections on Guam residence, source-income, and filing information before filing, retain copies of guidance you relied on, and watch for published updates.
Employers with Guam payroll must follow the territory’s mirror-code framework as administered locally and should use resources from both the Guam Department of Revenue and Taxation and the IRS. The IRS Form W-2GU page confirms that employers use a W-2GU form to report Guam wages and it directs readers to the current W-2 and W-3 instructions for reporting details. Locally, the DRT provides e-services and public notices describing submission paths for wage reporting and associated filings such as W-3/W-2GU and employer withholding forms. Employers and payroll professionals should consult the IRS W-2GU page for federal reporting connections and DRT e-services for local submission procedures. Keep an eye on DRT public notices and IRS instructions each year to see the specific forms and technical steps that apply. Current local or IRS instructions control annual details.
Individual taxpayers and preparers should treat Guam differently from a U.S. state filing regime because the territory uses a mirror-code framework administered locally. The IRS Publication 570 includes specific sections that cover Guam residence rules, source-income considerations, and general filing information for territories; these passages can help with federal residency and source questions. For local filing and submission paths, the Guam Department of Revenue and Taxation publishes e-services and public notices that list how to file forms such as W-1 and other local declarations. When deciding which instructions to apply, consider IRS Publication 570 for residence and source-income context and consult DRT e-services for local filing procedures and any public notices. Current local or IRS instructions control annual details.
Businesses operating in Guam will encounter local filing categories such as Guam’s Gross Receipts Tax (GRT) and SWICA contributions, and they should use the local channels the Guam Department of Revenue and Taxation provides to file according to local procedures. The DRT’s e-services and public notices provide specific paths for GRT filings, SWICA submissions, W-1 and W-3/W-2GU wage reporting, and various 1099-type information returns. Because Guam applies a territorial mirror-code framework managed locally rather than a state-plus-federal model, business filers should check DRT e-services for the precise local forms and submission steps and consult IRS materials for territory-related federal guidance. Review DRT public notices to learn about filing channels, technical instructions, and any updates that affect how returns are submitted in a given year. Current local or IRS instructions control annual details.
When making annual filing decisions for Guam matters, start by consulting the Guam Department of Revenue and Taxation’s e-services and public notices for the local filing paths the territory publishes, including guidance for GRT, SWICA, W-1, W-3/W-2GU, and 1099 filings. Parallel to the local resources, review IRS sources that cover territory issues: IRS Publication 570 contains sections on Guam residence, source-income, and filing information, and the IRS Form W-2GU page states that employers use W-2GU to report Guam wages while directing readers to current W-2 and W-3 instructions. Remember that Guam is administered under a territorial mirror-code framework locally rather than an ordinary state-plus-federal filing setup, and annual procedural specifics may come from both agencies’ current materials. Current local or IRS instructions control annual details.
Residency, source of income, local returns, and U.S. coordination questions
Living in Guam for the entire year generally means your tax interactions are handled under Guam’s locally administered mirror-code framework rather than a U.S. state filing approach. For residents who receive Guam-source wages or other local income, start with the Guam Department of Revenue and Taxation’s e-services and public notices for filing pathways such as GRT and SWICA, and consult the residence and filing sections of IRS Publication 570 for federal residency and filing context. The mirror-code framework is applied locally, so follow Guam DRT’s current instructions for filing and withholding forms that apply to residents. Because annual filing details and any form or deadline updates change each year, current Guam and IRS instructions control annual details.
Nonresidents who earn income in Guam face decisions about how their Guam-source earnings are reported and where to file. Employers reporting Guam wages use Form W-2GU as noted on the IRS W-2GU page, which directs employers to the current W-2 and W-3 instructions; individuals receiving those wages should review the source-of-income discussion in IRS Publication 570 to understand how Guam-source income is treated for federal purposes. For local filing and withholding obligations, check Guam Department of Revenue and Taxation e-services and public notices for paths such as W-1 and GRT filings. Guam operates a territorial mirror-code framework administered locally, so follow the current Guam and IRS guidance for annual details and filing instructions. Check current-year DRT and IRS publications because annual forms, instructions, and procedures may change.
Determining residency, source of income, and whether you file local Guam returns requires using both Guam and IRS guidance. IRS Publication 570 includes sections on Guam residence, source-of-income rules, and filing information; use those sections to understand U.S. coordination questions. Guam operates under a territorial mirror-code framework administered locally, so local filing channels differ from a U.S. state system. The Guam Department of Revenue and Taxation publishes e-services and public notices covering employer and taxpayer filing paths (for example GRT, SWICA, W-1, W-3/W-2GU, and 1099 filings). The IRS Form W-2GU page directs employers to use W-2GU for Guam wages and refers to current W-2/W-3 instructions. Practical steps: review Pub. 570 for residency/source guidance, check Guam DRT e-services and notices for which local documents to submit, and confirm the applicable year’s IRS and Guam instructions before filing or preparing payroll.
Independent contractors and other payees who receive miscellaneous income reported on 1099 forms should consider how Guam-source self-employment or contract earnings are treated locally and for U.S. filing purposes. Guam Department of Revenue and Taxation’s public notices and e-services list filing pathways for 1099 reporting and local return submissions, and IRS Publication 570 includes a source-of-income section explaining principles for determining whether income is Guam-source. Because Guam follows a territorial mirror-code framework administered locally, coordinate the DRT filing paths for 1099s with any federal filing obligations described by the IRS. Always check the current-year Guam DRT guidance and IRS instructions, since annual forms and filing directions are established in their latest materials. Do not assume prior-year instructions remain valid; review the current DRT e-services and IRS publications for the tax year you are filing.
When you change residency between Guam and the U.S. mainland or have income in both places, you must consider how Guam’s territorial mirror-code framework interacts with federal reporting rules and where income is sourced. IRS Publication 570 contains dedicated sections on Guam residence, source-income, and filing information that explain federal aspects; the Guam Department of Revenue and Taxation provides e-services and public notices for local filing pathways and any forms such as GRT or W-3/W-2GU that may apply. Remember that Guam is not a U.S. state tax system, and local administrations apply the mirror-code approach. For any move or cross-jurisdiction situation, rely on current Guam DRT and IRS instructions to determine the applicable forms and filing steps for the tax year in question.
Wages, W-2GU, business activity, payroll, and record questions
If you earn wages in Guam, your pay is handled under the territory’s local framework. Guam operates a mirror-code structure administered locally, so wages that are sourced to Guam are reported according to territory rules rather than under a mainland U.S. filing arrangement. The Guam Department of Revenue and Taxation provides e-services and public notices with filing paths for GRT, SWICA, W-1, W-3/W-2GU, and 1099 filings and is the first stop for current forms, filing methods, and payment options. For broader residence and source-income guidance, IRS Publication 570 includes sections that discuss Guam. Always follow the most recent local and IRS instructions, because annual materials can change and govern the specific filing details for a given tax year.
Employers reporting Guam wages use the Form W-2GU page guidance from the IRS, which identifies W-2GU as the reporting vehicle for wages paid in Guam and points employers to the current W-2 and W-3 instructions for how to complete copies and transmittals. Locally, the Guam Department of Revenue and Taxation posts e-services and public notices covering the W-3/W-2GU path and related filing choices such as electronic submission options. If you run payroll in Guam, consult both the IRS W-2GU page and the Department’s published instructions before preparing year-end statements. Annual details, including any updates to forms or submission methods, are governed by the most recent local and IRS instructions, so do not rely on prior-year procedures without checking current material.
When deciding how to report business activity on Guam, remember the territory’s mirror-code framework is administered locally and shapes how business receipts, wages, and other income items are treated for territorial filings. The Guam Department of Revenue and Taxation maintains e-services and public notices with filing paths for GRT, SWICA, W-1, and 1099 filings, which are commonly relevant for businesses operating on-island. The IRS Publication 570 offers helpful background on residence and source-income concepts that can affect whether income is treated as Guam-source, but territory-specific filing paths and form versions come from the local Department. For annual choices about which forms to file, whether to file electronically, and which instructions apply, always use the current Department and IRS guidance for the tax year.
Managing payroll in Guam requires following the territory’s locally administered filing paths for withholding and reports. Employers should consult the Guam Department of Revenue and Taxation’s e-services and public notices for links to W-1 registration or withholding forms, and for instructions about filing W-3/W-2GU copies and any applicable 1099 reporting. The mirror-code framework means federal-like forms may be used in a territorial context with local filing channels, so confirm whether to submit documentation electronically or by paper through the Department’s current portals. The IRS Publication 570 can help with residence and source-income context, and the IRS W-2GU guidance directs employers to the current W-2 and W-3 instructions. Always rely on the most recent local and IRS instructions for year-specific payroll rules.
Keeping clear payroll and business records is important when dealing with Guam filings, but exact retention periods and required documents depend on current Department and IRS guidance for the tax year. The Guam Department of Revenue and Taxation offers e-services and public notices where businesses and individuals can find instructions for W-1 registration, GRT, SWICA reporting, W-3/W-2GU transmittals, and 1099 filing pathways. The IRS Publication 570 can clarify residence and source-income issues that affect what records you need to show Guam-source activity. If you need employer wage reports or copies of W-2GU-related forms, check both the Department’s portals and the IRS W-2GU page, and follow the latest local and IRS instructions rather than relying solely on past practice.
Current forms, payments, public notices, records, and annual update timing
Use Guam Department of Revenue and Taxation e-services and public notices as your first stop for forms, filings, and payment paths. The Department’s online resources include specific links for the Guam income tax framework and for local filings such as GRT, SWICA, forms W-1 and W-3/W-2GU, and 1099 filings. Because Guam follows a territorial mirror-code framework administered locally rather than an ordinary state-plus-federal filing setup, local e-services and notices are central to annual filing decisions. Before completing any form or making a payment, review the Department’s current public notices and online guidance. Current local or IRS instructions control the annual details; rely on those sources for the most up-to-date procedural information. Check both the Department and the IRS each year to confirm which local or federal steps apply to your filing.
Employers with Guam employees should follow the guidance on the IRS W-2GU page, which states that W-2GU is the form used to report wages paid in Guam and directs readers to current W-2 and W-3 instructions. Guam’s Department of Revenue and Taxation also provides local e-services and notices for wage reporting, including paths for W-3/W-2GU filings and related payment options. Because Guam uses a territorial mirror-code framework administered locally, employers must coordinate both IRS instructions and local DRT directions for annual reporting choices. Always check the Department’s public notices and the IRS W-2/W-3 instructions for the year in question, as current local or IRS instructions control annual details. Reviewing both sources before filing helps employers decide on submission channels, payment timing, and recordkeeping practices for the tax year.
Individual taxpayers who live in or receive source income from Guam should consult IRS Publication 570, which contains specific sections about Guam residence, source-income, and filing information, alongside local Department of Revenue and Taxation e-services and public notices. Guam’s mirror-code framework is administered locally, so reading both Publication 570 and local DRT guidance helps clarify which local forms and filings apply. The Department’s online paths include GRT, SWICA, W-1, and 1099 filing options that individuals may need to access. Check current DRT public notices and the IRS materials before making filing decisions because current local or IRS instructions control annual details for what must be filed and how filings are submitted. When in doubt, use the Department’s e-services contact options and the IRS contact points referenced in Publication 570 to confirm procedures for the year.
The Department of Revenue and Taxation’s e-services include paths for payments and for filing information returns such as 1099s, and the Department posts public notices that outline available electronic filing and payment methods. Under Guam’s mirror-code framework administered locally, use the local e-services for payment remittance and for submitting information returns in the formats the Department designates. Keep records of filings and payments in line with both the Department’s published guidance and the IRS instructions that relate to Guam matters. Because the fiscal year and filing particulars can change, always verify the current year’s details through the Department’s public notices and applicable IRS materials, since current local or IRS instructions control annual details. Consult the Department’s online help and the IRS resources referenced for Guam when deciding which payment channel and record formats to use.
Timing for annual updates depends on the Department of Revenue and Taxation’s e-services announcements and IRS publications such as Publication 570, which covers Guam residence, source-income, and filing information. The Department issues public notices and posts paths for GRT, SWICA, W-1, W-3/W-2GU, and 1099 filings; this local mirror-code framework is administered by Guam officials rather than following an ordinary state-plus-federal filing model. Before acting on a draft plan or making a filing decision, consult the Department’s latest public notices and the IRS materials that address Guam topics. Remember that current local or IRS instructions control annual details, and verify those sources for each tax year. If you rely on guidance from either source, note publication dates and cross-check annual notices so you base actions on the most recent official instructions.
Connect a Guam territory question to the next federal or planning decision
If you are weighing whether to file a Guam income return or how local income affects a wider federal plan, start by checking the Guam Department of Revenue and Taxation e-services and public notices for local forms and filing paths such as the W-1 and information-return guidance. For federal residence and source-income interpretive points, use IRS Publication 570’s sections on Guam residence, source-income, and filing information to inform the next step in your planning. Remember that Guam uses a territorial mirror-code framework administered locally rather than an ordinary state-plus-federal filing setup, and that current local or IRS instructions control annual details. Keep records of which official pages you consulted so your next planning decision references the authoritative materials.
When an employer in Guam considers which wage forms to prepare and how to report Guam wages, the employer-facing IRS Form W-2GU page confirms that employers use the W-2GU to report Guam wages and points to the current W-2 and W-3 instructions for procedure. Employers should also consult Guam Department of Revenue and Taxation e-services and public notices for local filing routes that intersect GRT, SWICA, and information returns like 1099 filings. Because Guam operates under a territorial mirror-code framework administered locally rather than an ordinary state-plus-federal filing system, coordinate checking both the local DRT notices and the IRS instructions. Current local or IRS instructions control annual details, so base the next payroll or reporting decision on the authoritative pages in effect for the year in question.
Business owners faced with choices about gross receipts tax (GRT) and Guam workers’ compensation assessments (SWICA) should first use the Guam Department of Revenue and Taxation’s e-services and public notices to identify local filing pathways and any required forms. The Guam mirror-code framework is administered locally rather than functioning like an ordinary state-plus-federal arrangement, so local DRT guidance will indicate how those territorial rules are implemented for business reporting. For matters that touch federal filing or residency considerations, consult IRS Publication 570 which includes Guam residence, source-income, and filing information sections that clarify federal-facing points. Current local or IRS instructions control annual details; make the next planning step after confirming the authoritative guidance for the tax year you are examining.
If your question centers on residency or source of income for someone living or working in Guam, connect that territorial inquiry to federal planning by consulting IRS Publication 570’s sections on Guam residence, source-income, and filing information alongside Guam Department of Revenue and Taxation e-services for local notices. The mirror-code framework in Guam is administered locally and is not the same as an ordinary state-plus-federal filing setup, so the way local rules operate may affect the information you gather for federal decisions. Use the IRS materials to understand federal residence and source-income concepts, and use DRT channels for local filing paths and forms. Current local or IRS instructions control annual details; base the next planning step on those official sources.
When planning how Guam reporting interacts with broader federal reporting obligations, consider both Guam Department of Revenue and Taxation e-services for local filing paths — including GRT, SWICA, and information returns like 1099 filings — and the IRS guidance that applies to territories. Employers and payers should note the IRS Form W-2GU page which tells employers to use that form for Guam wages and directs users to current W-2 and W-3 instructions for federal-facing procedures. Remember that Guam’s mirror-code framework is locally administered and not an ordinary state-plus-federal filing arrangement, so coordinate your next reporting decision using both the DRT notices and IRS instructions. Current local or IRS instructions control annual details; confirm the authoritative source for the year you are planning.
Verify with primary sources
Official sources to monitor
Use these official territory and IRS sources to verify the current baseline and confirm annual 2027 forms, instructions, and payment details when they are published.
Frequently asked questions
Plan the next step with the facts you have now
When a move, source-of-income question, business decision, or more than one tax jurisdiction shapes the result, bring current records and official guidance to a focused planning conversation.