What you must report after a BOI certificate, and what a miss costs

01Two reporting lines — do not treat them as one thing

Plenty of owners read BOI as "approved means done". In practice the certificate only puts you on a list that stays under supervision: from the day it is issued you file two sets of reports on the official rhythm, and you keep filing. Nobody flags this for you, and it is where most first-year trouble comes from. See also what else follows a BOI approval.

The first is the project progress report, filed quarterly. It covers four things during the build-out: land, factory building, machinery, and the first revenue from the promoted business. It answers whether you are building the project you promised. You start on the date the certificate is issued and keep going until you are granted approval to open for operations.

The second is the annual company operating results report, once a year, due on the same fixed mid-year date. It carries far more than the quarterly one: shareholder information, financial statements, the annual corporate income tax filing data, employment data, and the relevant standards certifications. This one applies to every certificate holder, including companies that have been operating for years.

The most common misunderstanding is that opening for operations ends the reporting. Opening ends only the first line, the quarterly progress report. The second is a standing obligation for as long as the certificate is alive and the incentives are in use — it comes round every year.

02The quarterly window was tightened; an old calendar makes you late

The filing window for the quarterly progress report used to be 60 days after quarter end; the current rule tightens it to 30 days. That change halves the internal preparation time. Collecting the numbers at a comfortable pace after quarter end now runs straight into the deadline. If your finance team is still working from the old calendar, you will most likely be late this year.

One more trap: the machinery investment figure in the quarterly report and the duty-free equipment list are the same numbers from the same source. If the equipment side has not been kept current, the machinery progress in the quarterly report looks behind where the project actually is, and that invites questions about whether the project is on track. Reconciling the two before you file is a necessary step, not an optional one.

03Being late costs more than a fine

This is the sentence worth remembering from this page: a late or missed report reaches your duty-free import rights — the duty-free channel for machinery and raw materials gets locked, and goods already at the port cannot be released. For a plant still installing equipment and still ramping up output, that hurts far more than any penalty payment.

The annual report carries the heavier consequence. Under section 39 of the Investment Promotion Act B.E. 2520, continued failure to meet promotion conditions and reporting obligations can trigger suspension or revocation of promoted status, with the corporate income tax exemption already enjoyed clawed back (sources 1 and 2). An annual report nobody owns can, in other words, hand back the tax saved over the past several years.

04How to make it something you do not miss

Three habits do most of the work here.

• Name someone responsible; do not let finance pick it up in passing. The two lines run on different definitions and different source data — one needs construction progress, the other needs financial statements and employment records. Hanging both on one person to do alongside everything else is the main reason reports get missed.
• Work back to an internal deadline. Set an internal data-submission date two to three weeks ahead of the official deadline, so that collecting the numbers and filing them are two separate acts.
• Reconcile before you file. Square the machinery and investment figures against the equipment list, and the employment data against the personal income tax and social security filings, then submit. Changing a number after it has gone in costs far more to explain than checking it once beforehand.

Which lines your company owes this year, which figures come from which schedule, and whether there are past misses to clean up first all have to be checked item by item against your certificate conditions, the date it was issued and your existing books — see which clauses on a BOI certificate actually matter. We suggest having our advisers run an obligations inventory first, lay out the filing calendar for the whole year, and only then decide who inside the company owns which box. What the BOI engagement covers.