With a wide array of specialized services, GSiA has the in-depth knowledge and experience to give you professional assistance with your tax, assurance and business consulting matters – whether your business operations are cross-town, cross-country or cross-continental.
Through the Transfer of Excellence of our Association Network, GSiA has knowledge, training and experience to provide the level of professional accounting, assurance, tax and consulting services to support and grow your business – in nearly every sector or industry.
The CPAs within GSiA get specialized technical and industry-specific training and resources from local professional training and from our international network. We assure that we can find the solutions and advice that the business needs.

  • Monthly Accounting Records
  • Issuance of Internal Financial Statements
  • Withholding Tax Filing
  • Value-Added Tax Filing
  • Corporate Income Tax Filing
  • Secretarial Assistance

Audit and Assurance

  • Statutory Audit
  • Internal Control Audit
  • Agreed-upon Procedure
  • Stock Examination
  • Fixed Asset Examination


  • International Tax
  • Tax Credits
  • Tax Health Check
  • Transfer Pricing
  • Tax Refund
  • Tax Examination


  • Business Registration
  • Accounting System Consulting
  • Business Consulting