P.N.D.90 by 31 March of the following year. P.N.D.94 for business income received January to June, between 1 July and 30 September. Filing online gives 8 more days for each.

P.N.D.90 and P.N.D.94 for Sole Proprietors

Personal income tax returns for sole proprietors and non-registered partnerships: the annual return and the half-year return. The sole proprietor pays tax on the business profit at the personal rates, together with any other income such as salary or rent. P.N.D.94 brings in tax on half of the year early.

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Who this applies to

  • Sole proprietors
  • Non-registered ordinary partnerships

What to file

P.N.D.90 for the full year at the progressive rates (0% on the first 150,000 baht of net income, rising to 35% above 5 million baht). P.N.D.94 for the first half of the year.

How to file

On paper or online through e-Filing. AccountsOS does not submit personal returns. Finn keeps the date on your calendar, reminds you before it falls due and shows the figures from the books your accountant needs.

Payment due

With each return. P.N.D.94 tax is credited against P.N.D.90. Tax due on P.N.D.90 may be paid in instalments in some cases; ask your accountant whether it applies.

Penalties for missing this deadline

Late tax carries a surcharge of 1.5% per month.

Filing checklist

  • Total business income and expenses for the period
  • Choose between actual expenses and the deduction the Revenue Department allows, with your accountant
  • Credit any tax withheld from your income
  • File and pay

Documents you'll need

  • Business income records
  • Expense receipts if claiming actual expenses
  • 50 Tawi certificates for tax withheld from your income

Common mistakes to avoid

  • Forgetting the half-year P.N.D.94
  • Treating a sole proprietor as a company for tax
  • Forgetting to credit tax withheld by customers
  • Leaving out income from other sources in P.N.D.90

Never miss a Thailand deadline

AccountsOS tracks every Revenue Department (กรมสรรพากร) and Department of Business Development (กรมพัฒนาธุรกิจการค้า, DBD) deadline and reminds you weeks ahead.

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