BOI duty-free machinery import: the window and what if you miss it
Machinery brought in under the exemption has to be imported within the period stated in the certificate, and the list has to be filed and approved before anything ships. The window can be extended, but the request must go in before it expires. Shipping equipment that has not been approved and then finding you cannot get it released at the port is the most expensive mistake on this chain.
01Get the list approved, then ship — out of order and everything backs up
Duty-free import of machinery is the BOI benefit that turns into cash fastest — the duty on a single production line can run to seven figures. It is also the easiest stretch of the execution phase to come off the rails, because two constraints apply at the same time: a time window and a prior approval.
Duty-free import is not a matter of telling the officer at clearance that you are a BOI company. The order is: file the machine master list first — equipment name, tariff code, supplier, quantity, value — and arrange shipment only once the equipment shows as approved in the system.
Reversing that order has a very direct consequence. The goods arrive, the list is still not approved, duty-free release cannot be done, and the cargo either sits at the port running up demurrage or gets switched at short notice to a duty-paid import — the duty you were saving becomes cash actually paid. The most expensive lesson we have seen on a live project is exactly this one.
There is a companion rule: the list has to match the purchase documents. If the type numbers, quantities or values on the letter of credit and the purchase contract do not agree with the approved list, release gets held up just the same. Aligning the purchasing side with the list before filing is far cheaper than amending documents afterwards.
Three things have to be green before anything ships:
- The equipment sits on a machine master list that has been filed. Check unit by unit that each machine maps to a list entry.
- The list status is approved, not merely submitted. Confirm it has actually been granted rather than just lodged.
- The purchase documents line up with the list item by item. Compare the type numbers, quantities and values on the letter of credit and the purchase contract against the list.
All three green, then ship. If any one of them has not cleared, stop.
02The time window: import inside the period, and ask early if you need longer
The import period for exempt machinery runs from the date the certificate is issued. Anything not imported by the end of the window no longer carries this benefit. The window can be extended, and there is more than one chance to do so — but in every case the request has to be made before the current period expires, setting out why the schedule slipped and what the revised delivery plan is.
Note that this window and the 36-month deadline for starting operations are two different lines, applied for through two different channels. They run from the same date, which is why they get treated as one thing. If you need more time on both, you file for both, separately. See how to work back from the 36-month deadline.
03Which taxes are actually exempt — do not budget as if everything is
This is the line most likely to make an investment projection too optimistic. The BOI machinery import benefit exempts import duty and import VAT; excise tax is not inside the exemption. If your equipment, or material shipped with it, contains items subject to excise — batteries, for example — that tax is still payable in the normal way (source 2).
We checked one case on a live project: on a batch of equipment for a data centre project, duty and VAT were exempt under the benefit, but the battery portion still carried a seven-figure excise payment. If that is not in the budget, cash flow on arrival day looks bad. For the wider duty picture on equipment shipments, see whether import duty can be cut when shipping equipment from China.
04When the machine is not on the list, or approval will not arrive in time
There is a practical fallback: not every shipment has to go through the duty-free channel. When equipment is not on the approved list, or approval will not come through in time, assess the other preferential channels by the origin of the goods — goods originating in China can be considered for the rate under the China–ASEAN agreement, goods originating within ASEAN for the rate under the ASEAN free trade agreement. Where neither applies, import and pay duty at the ordinary rate.
Two things to watch. These agreement channels reduce duty only — VAT and excise are still payable, and they require complete certificate-of-origin paperwork, with the certificate number and issue date matching. So this is the second-best answer when time has run out, not a reason to stop caring about the list.
Which channel each shipment should take, whether your machine list and purchase plan line up, and how much of the window is left all have to be judged shipment by shipment against your certificate conditions, the approval status of the list and the actual sailing schedule. Judgements of that kind are normally made by our advisers, who put a written view on each shipment and keep the record, so that one batch does not get treated on different bases at different stages. What the BOI engagement covers.
Related
Sources
- Board of Investment (BOI): the duty-free machinery import benefit under section 28 of the Investment Promotion Act B.E. 2520 — equipment must have its list filed and approved before it can be released; import must be completed within the period stated in the certificate, and that period can be extended under the rules in force. Checked 2026-07
- CTAC Thailand project evidence: under section 28, import duty and import VAT are exempt, but excise tax (on taxable items such as batteries) falls outside the exemption and must be paid — verified and corrected against the actual tax payment record for a batch of equipment on a data centre project in progress in 2026. Checked 2026-07
- General note: the length of the import window, the number of extensions available, list filing requirements and preferential agreement rates all change with official announcements. This page states no specific periods or rates; the announcements in force from the Board of Investment (BOI) (boi.go.th) and Thai Customs (customs.go.th), and the terms of your own promotion certificate, prevail.
BOI filing: tier assessment, document preparation, submission and follow-up. You confirm and decide.
中文版 · Chinese version