Is this the Revenue Department’s official form?
No. This tool makes a withholding tax certificate in the payer’s own format, laying out the items of the section 50 bis (มาตรา 50 ทวิ) certificate form the Director-General prescribes. The Revenue Department says the payer must issue the payee two copies with identical content that contain "at least the text of the form" the Director-General prescribes (copy 1 to attach to the return, copy 2 kept as evidence), so every item is kept. It is not a printed Revenue Department form and is not endorsed by the department. You are responsible for its correctness. If unsure, ask an accountant or the Revenue Department.
Do I still have to file PND.3 or PND.53 after issuing a 50 Tawi?
Yes. The certificate is only the evidence the payer gives the payee. It does not file a return and does not pay the tax. The payer must still file the return and remit the tax withheld (for example PND.3 for individuals and PND.53 for companies) by the Revenue Department’s deadlines. This tool files nothing, does not connect to the Revenue Department and does not check that you have filed. The "row number in the form" only helps you match your own return.
Are the suggested withholding rates right?
They are suggestions, and every one is editable: services 3%, rent 5%, advertising 2%, transport 1%, prizes 5%, professional fees 3% and dividends 10%. The correct rate depends on who is paid (individual, company, foundation, non-resident), the income type, exemptions and the Revenue Department’s orders in force at the time, including any temporary measures. Before you rely on a rate, check the current withholding-tax manual and order Tor.Por.4/2528 linked in the tool, and never withhold less than the law requires.
How are tax and baht text calculated, and is my data uploaded?
Each row’s tax is amount x rate, calculated in whole satang and rounded half up. The totals are the sums of the rows’ satang, and the total tax is written in baht text (for example หนึ่งพันสามร้อยบาทถ้วน). You can type over the tax on any row. Names, addresses, tax IDs and the signature are processed in your browser and the PDF is built on your device; nothing is uploaded. The tax ID gets a checksum check that only warns and never blocks the document.
What is free, and what does Pro add?
Making and downloading the certificate is fully free: copy 1 and 2 (plus an optional file copy), no watermark, no account, one certificate at a time, and free users store nothing on the device. iToolers Pro adds on-device memory only: 3 payer profiles with signature, 100 saved payees, automatic certificate and row numbers, and a history of 100 certificates to duplicate. A DC03 seller profile can also be reused as the payer.
