The Official Web Site of the Guam Department of Revenue and Taxation
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  GUAM DEPARTMENT OF REVENUE AND TAXATION Dipattamenton Kontribusion yan Adu'ana  
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W-1: Employer's Quarterly Guam Tax Return

Description of Service

  • Effective January 1, 2009 , file your Employer's Quarterly Guam Tax Return electronically with our department using GuamTax.com.

Where to File


  • Enter daily and monthly tax liability amounts, as well as credits/adjustments and depository payment amounts as necessary
  • Integrates with the Government of Guam's POS system to retrieve associated Form 500 payments
  • E-filing history allows you to access your e-filed W-1 returns at your convenience
  • Ability to pay any balance due online at time of filing

Registration Requirements

  General Commercial Entities

  • EIN or SSN
  • Existing GRT account number
  • Vald e-mail address


  Government of Guam Agencies

Government of Guam agencies must have their GuamTax accounts created by our department. Agencies must complete the following form and send it to our department:

E-Filing Registration Form for Government of Guam Agencies

Mail To:
Department of Revenue and Taxation Attn. GuamTax PIN Administrator
P.O. Box 23607 GMF
Guam 96921.

Or Fax To:
(671) 633-2643