VAT refunds · what unblocks them

Export VAT refunds in Thailand: recovering the cash on your books

Prepared by the CTAC Thailand advisory team · Updated 2026-08-24

In short

Exports are zero-rated, so the input VAT you pay on purchases has no output tax to absorb it and accumulates as a credit balance. That balance can be carried forward, or it can be claimed back as a refund — and plenty of export factories carry it forward out of habit, year after year, until the amount sitting on the books is substantial. Whether you actually get it back depends almost entirely on two things: whether your input invoices are compliant, and whether your figures are consistent across the returns, the books and the export documents.

01How the credit builds up, year after year

For a factory with a high export share this is not a nice-to-have. It is real cash. So it is worth being precise about how the money gets stuck, why most companies never go after it, and what has to be in place before they can.

The mechanism is simple. Export sales are zero-rated, so output VAT is close to nil. Meanwhile you keep paying input VAT on domestic purchases — raw materials, equipment, services. There is no output tax for it to offset, so the difference accumulates as a credit balance.

You can do one of two things with that balance: carry it forward against future periods, or apply to have it refunded. Plenty of companies chose carry-forward in year one and never revisited the decision. The higher the export share, the more you buy domestically, and the longer the carry-forward runs, the bigger the number sitting there — earning nothing at all.

Work out the size before you decide either way. Filing without knowing what is actually recoverable is a gamble. But assuming it is not worth the trouble, without ever running the numbers, leaves cash idle for no reason. The first step is always the same: establish how much is sitting on the books and which periods are open to a claim.

02Why most companies never claim: the follow-up loop

Whether a company files usually comes down to one thing: whether anyone is willing to face the follow-up loop. You submit, you are asked for more documents, you supply them, you are asked again. After a few rounds the person handling it stops wanting to touch the file.

But the length of that loop is set almost entirely by how well you checked your own file before submitting. The reviewer is looking at a chain of evidence: every input item you claim has to be supported by a compliant tax invoice, and the VAT return, the accounting records and the export documents have to agree with one another. A problem you find yourself can be dealt with calmly. The same problem found in review becomes a follow-up request.

All three arise before the application is ever filed. What you find yourself, you can fix calmly; what the review finds becomes a document-chasing loop — and how long that loop runs is decided almost entirely by the quality of the self-check beforehand.

03The three things that stall a refund

Refunds stall for a short list of reasons, and all three of them arise before the application is ever filed.

Non-compliant invoices. Missing required particulars, made out to the wrong entity, or booked to the wrong period — these are struck out at review. What makes them painful is that the window to fix them is short: an invoice from three years ago with the wrong name on it means going back to a supplier who may have been deregistered since.
The return, the books and the export documents do not tie out. Amounts or periods that disagree across the three trigger further examination.
Documents and deadlines slip. Requests are answered late, or the filing schedule is missed altogether. Drift is the single most common reason a refund takes longer than it should, and repeated drift shapes how later applications are received.

04BOI-promoted companies: same process, a few extra things to check

This gets misread often. A company holding investment promotion files through the same VAT refund process as an ordinary company — the same forms, the same rules, and the same eligibility test for the accelerated Good Exporter track, which is based on paid-up capital and export ratio rather than promotion status. What actually differs are three things worth checking before you file: duty-free imports exempt the import leg only, not local VAT; a promoted exporter's business structure tends to build up a larger credit balance than a comparable domestic-market company; and duty-free import data has to reconcile with what the project reports under its BOI monitoring obligations, or the review raises extra queries. How this plays out for BOI-promoted companies.

05Three things that make it go smoothly

None of this is complicated. It is simply work that has to happen before the filing rather than during it.

Control input invoices as they arrive. A refund is the product of routine discipline, not a push at filing time. Checking each invoice for the required particulars on receipt, as part of monthly bookkeeping and filing, is far more realistic than trying to repair a year of invoices the month before you file.
Reconcile before you file. Get the books, the returns and the export documents to agree first. List whatever will not tie out, sort it by type, and work through it type by type.
Have someone tracking the review. Queries need prompt, accurate answers. Every query should have a name and a date against it.

How much comes back, and how long it takes to arrive, depends on your input profile, your export share, how complete your documentation is, and how the review runs. There is no general answer, and we do not publish estimated ranges — a range would only mislead your budgeting. Your own credit balance, the track that applies to you and the periods still open have to be verified item by item against the accounting records, the returns and the export documents.

Sources

Revenue Department (RD): zero-rating of exports; the rules on carrying forward and refunding accumulated input VAT credits; the conditions and documents required for a claim; the statutory particulars of a tax invoice and the conditions for deducting input tax. Checked 2026-07.
Thai Customs: current requirements for export declarations and the supporting chain of export evidence. Checked 2026-07.
General note: refund proportions, claimable periods, review timeframes and required documents are updated by official announcement. Companies holding investment promotion follow the same refund process as ordinary companies, but need to reconcile duty-free import data against their BOI monitoring filings. This page does not estimate the recoverable amount or the time to payment; the Revenue Department's current rules (rd.go.th) and case-by-case verification govern.

Checked against the official texts by the CTAC Thailand advisory team. We track the gazettes of the BOI, the Revenue Department, the Department of Business Development and Thai Customs every week; when an official position changes, the affected pages are updated and dated.

This page is general information based on the rules in force at the date shown. Thai BOI categories, incentive conditions and foreign-investment rules change often. Before acting on any specific project, check the latest official announcement and have a formal opinion issued on your own facts.

This is work you can hand to the advisory team

Export VAT refunds: assessment, document preparation, filing and follow-up. You confirm and decide.

中文版 · Chinese version