ฉบับภาษาไทย: อ่านหน้านี้เป็นภาษาไทย
How long do I have to appeal a Thai tax assessment?
Short answer
An appeal against an assessment is filed with the Revenue Department on the prescribed appeal form within 30 days of receiving the assessment notice. The period is short and counted from receipt, so the deadline is calculated the day the notice arrives, not the day it is understood.
Filing the appeal is a separate question from paying. An appeal does not automatically suspend collection of the assessed amount, and surcharges continue to accrue on unpaid tax, so the decision on whether to pay under protest while appealing is a commercial one that should be taken with advice at the start rather than after the outcome.
Build the appeal around documents. The Revenue officer's position is normally that a deduction, a zero-rating or an input claim is unsupported; the winning response is the missing evidence, presented in an organised bundle with a clear reconciliation. Where the appeal is unsuccessful, the next step is the Tax Court, which has its own deadline running from the appeal decision. Scope, turnaround and fees are confirmed by IVC staff by phone, LINE or email — this site does not publish prices.
Reviewed as of 2026-08-04. General guidance only, not case-specific advice and not a guarantee of outcome. Government fees, conditions and processing times are set by the responsible authority and can change. This site does not publish prices — please ask our staff.
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