Corporate income tax: 20%, with SME rates when both tests are met
Thai corporate income tax is 20% of net profit. It applies to a company limited, a public company limited, a limited partnership, a registered ordinary partnership and a branch of a foreign company. A small company pays 0% on the first 300,000 baht of net profit and 15% up to 3 million baht, but only when paid-up capital is 5 million baht or less on the last day of the period and sales and service income is 30 million baht or less.
Finn checks both tests against your books and your registered capital before it uses the SME rates. It adds back entertainment above 0.3% of gross receipts, caps passenger car depreciation at a cost of 1 million baht, and shows the computation line by line for your accountant.
- P.N.D.50 within 150 days of year-end: 30 May for a 31 December year-end
- P.N.D.51 within two months after the first six months: 31 August
- 8 more days when filed online through e-Filing
7th monthlyThe P.N.D.1, 3 and 53 lands on 7th monthly. Finn puts it on your calendar and reminds you ahead of it.
VAT at 7% and the monthly P.P.30
The Revenue Code rate is 10%, but a royal decree holds VAT at 7%. Royal Decree No. 807 (B.E. 2569) keeps 7% until 30 September 2027, and Finn always quotes that date with the rate. A business registers once annual turnover goes over 1.8 million baht.
Every VAT registrant files P.P.30 for each calendar month by the 15th of the next month, or the 23rd online, even with no sales. Finn builds the figures from your sales and your purchase tax invoices, and moves input VAT you cannot claim, such as entertainment and passenger cars, to the cost line.
Withholding tax and the 50 Tawi
Thai companies withhold tax on many payments. When you pay a Thai agency for services, 3% is withheld. Rent carries 5%. The tax goes to the Revenue Department on P.N.D.53 for companies or P.N.D.3 for individuals within 7 days of month-end, or 15 days online, and the payee gets a 50 Tawi certificate.
Finn works out the withholding when you record a supplier payment, reminds you about the certificate, and lists what goes on each monthly return. Pay for staff goes on P.N.D.1 on the same timetable.
Payroll and Social Security
From 1 January 2026, employer and employee each pay 5% of monthly wages on a wage base of 1,650 to 17,500 baht, so at most 875 baht each. Form SPS 1-10 and payment are due by the 15th of the following month, and late payment adds 2% a month.
AccountsOS does not run Thai payroll. Post your payroll report and Finn books the salaries, the employer contribution, the employee deductions and the withholding, and tracks the dates.
Audited statements and the DBD
Every Thai company and juristic partnership needs a licensed auditor. A company limited approves its audited financial statements at the shareholders' meeting within 4 months of year-end and files them with the Department of Business Development within 1 month of approval. The shareholder list, BOJ.5, goes to the registrar within 14 days of the annual meeting.
Finn closes the books each month so the year-end trial balance is ready for your auditor, and tracks the meeting and filing dates.
Sole proprietors and BOI companies
A sole proprietor pays personal income tax, not corporate tax: 0% on the first 150,000 baht of net income, rising to 35% above 5 million baht. The annual P.N.D.90 is due by 31 March and the half-year P.N.D.94 by 30 September. Finn keeps the business ledger and tracks both.
A project promoted by the Board of Investment can be exempt from corporate tax for up to 8 years, or up to 13 years for some advanced-innovation activities. Finn never assumes BOI status. It asks for your promotion certificate and keeps promoted and non-promoted income apart.
What stays with you and your accountant
AccountsOS keeps the books and works out the figures. It does not issue e-Tax Invoices or e-Receipts to the Revenue Department: that system is one you join through your own registered channel, and a PDF invoice from AccountsOS is an ordinary document. It does not submit P.P.30, P.N.D. returns, SPS 1-10 or DBD filings. You or your accountant file and pay, and your auditor signs the statements.