Cross-border withholding tax quick reference (editable workbook)

01The expensive mistake is filing one return and missing the other

When a consulting fee, an introduction fee or a commission is paid abroad and the Thai-side tax steps are not done correctly, the exposure sits with the payer first, not with the party being paid. The most common failure is not missing the whole thing — it is doing only half of it: the PND.54 for income tax withholding is filed and the 7% reverse-charge VAT on PP.36 is forgotten, or the other way round. These are two separate returns with two separate sets of reasoning, and filing one while missing the other happens often.

One point that gets confused is worth settling here. Income tax withholding on cross-border payments always goes on PND.54 (section 70), whether the recipient is a company abroad or an individual abroad. PND.3 is the domestic form for payments to a Thai individual, not a cross-border form. The real dividing line is the recipient's tax residence, not their nationality or where they sit — residence turns on days present in Thailand and on the source of the income, has to be settled case by case, and where it is unclear, go by the official rules in force and by verification of the individual case.

The second way this goes wrong is sequence: pay first, sort out the paperwork afterwards. The tax obligation on a cross-border payment arises at the moment of payment, and there is limited room to repair it later. The clearest example is treaty relief. To file at zero, the recipient's certificate of tax residence (CoR) for the current year has to be in hand before the payment goes out; without it you withhold at the default rate first and pursue a refund afterwards, rather than filing at zero. Where tax should have been withheld and was not, the payer, as the party legally obliged to withhold, carries primary liability, plus a surcharge of 1.5% per month.

The third is more hidden: the contract is not drafted correctly. A plain introduction or intermediary service normally sits under business profits in the treaty; where the substance involves the transfer of know-how or proprietary knowledge, it can be recharacterised as royalties, with a completely different rate. And where the withholding tax and VAT procedures were not compliant, the corporate income tax deduction for the whole expense can be denied — so what is lost is more than the withholding itself.

02What the four sheets do

Four sheets:

• Payment type quick reference. Service fees, introduction fees and commissions, management fees and technical service fees paid to a parent company, royalties and dividends, set out row by row: which return the cross-border withholding goes on, whether PP.36 is triggered at the same time, and whether a treaty can relieve it. Both obligations fall by the 7th of the month following payment; that sits in the sheet note rather than being repeated on every row.
• Two obligations side by side. Section 70 income tax withholding and section 83/6 reverse-charge VAT in two columns, read against each other: trigger, rate, deadline, whether a treaty can relieve it, what happens if it is not filed, and the effect on deductibility, cell by cell.
• Treaty relief preparation sheet. Certificate of tax residence, no-permanent-establishment declaration and written service agreement come first, followed by status verification, retention and filing, back-planning the documents, and the stamp duty effect of contract wording along with the evidence chain for deductibility. Each item states when it has to be in place, who is responsible, and what happens if it is not done.
• Payment-by-payment log. Blank throughout, one row per cross-border payment, add rows as needed. Two columns are set aside for the internal cut-off date and the person responsible, so it can be used as an internal control sheet before money goes out.

03The sheet deliberately leaves cells unfilled

Only a few figures can be fixed: reverse-charge VAT at 7%, both obligations due by the 7th of the month following payment, and a surcharge of 1.5% per month where tax should have been withheld and was not. Service fees and introduction fees paid to an overseas company also carry a common default of 15%, but that is not a figure to copy across — the rate that applies varies with the nature of the income and the treaty in force, and is governed by the rules current at the time of payment and by the treaty text itself. So that cell is still marked amber.

Every cell that moves case by case is marked amber. It means "an adviser has to settle this against your company's contract, the recipient's status and the treaty text", not "copy this default". A quick reference sheet with every rate guessed in is more dangerous than one left blank — it makes people think there is nothing left to check.

One thing to say up front: this sheet does not cover cross-border interest or cross-border rent. Neither sits in its rows, and the sheet draws no inference about which return or which rate applies to them. Hand those to our advisers separately.

04How to use it

Three steps. First, before payment, locate the payment type on the quick reference sheet — cross-border withholding always goes on PND.54, so what actually has to be checked separately is the recipient's tax residence and how the contract characterises the payment; which treaty article applies and in whose name the residence certificate is issued both branch from there. Second, plan the document timing backwards against the treaty relief preparation sheet: a residence certificate takes time to obtain, and asking for it only just before payment often misses the filing window. Third, enter the payment in the log and set an internal cut-off date ahead of the 7th, so that "settling the position" and "filing" become two separate actions.

One more reminder. If your company holds a corporate income tax exemption, the treatment and timing of profit distributions during the exemption period are not the same as for an ordinary company; go by the official rules in force and by the terms of your promotion certificate, rather than distributing the way an ordinary company would. How a given payment should be characterised, whether a treaty applies and which documents to prepare have to be checked payment by payment against the contract text, the recipient's status and the treaty text. Better to have our advisers go through it before payment than to catch up afterwards.