Once a Thai business crosses the VAT registration threshold, the rules change quickly. Revenue that was simple to track now requires tax invoices, monthly PP.30 filings, and stricter document discipline.

Who must register for VAT

Any person or entity that sells goods or provides services in Thailand and earns more than 1,800,000 baht per year in taxable revenue must register for VAT. This applies to companies, partnerships, and sole proprietors—including online sellers and service businesses.

Some revenue types are exempt from the threshold calculation (certain agricultural products, specific professional services, and other categories defined by law). Verify your revenue base with current Revenue Department guidance before assuming you are below the line.

The 30-day clock starts when you cross the threshold

When cumulative revenue in a calendar year exceeds 1.8 million baht, you must file for VAT registration within 30 days of the date the threshold was crossed—not at year-end. Late registration can trigger back-dated VAT assessments, penalties, and interest.

Practical tip: start preparing documents when revenue approaches 1.5 million baht so registration is not rushed.

Documents and what changes after registration

Typical registration requires business registration documents, ID or corporate certificates, and address proof. After registration you must:

  • Issue tax invoices (ใบกำกับภาษี) on qualifying sales
  • File PP.30 monthly, usually by the 15th of the following month (confirm current deadlines with the Revenue Department)
  • Keep input VAT documents from suppliers to offset output VAT
  • Update your accounting system and POS to reflect VAT on invoices

Common mistakes Thai SMEs make

  • Waiting until an accountant flags the issue at year-end
  • Missing supplier tax invoices and losing input VAT credits
  • Mixing personal and business expenses after registration
  • Under-reserving cash for net VAT payable each month

Phuket hospitality businesses often cross the threshold during high season. Plan VAT cash flow before peak revenue arrives—not after filing season.

VAT registration checklist

  • Track cumulative revenue monthly against the 1.8M threshold
  • Prepare registration documents before you cross the line
  • Register within 30 days of crossing
  • Configure invoicing and accounting for 7% VAT
  • Set a monthly PP.30 filing and payment rhythm
  • Train staff on issuing and collecting tax invoices

Related reading: tourism tax planning in Phuket.

Aspect One helps SMEs register for VAT, set up compliant invoicing, and stay on top of monthly filings. Explore tax planning and compliance or contact us for a consultation.