Keep tax papers all year so filing isn't a rush

At tax-filing time (early the following year) many people dig through chats and emails for a whole year of documents — slow, and deductions get missed.

General information. Filing deadlines and allowances can change every year — check with the Thai Revenue Department or an accountant before filing

One folder, five categories

1. Income — invoices and receipts you issued, monthly platform statements
2. Tax withheld — withholding-tax certificates (50 Tawi) from clients, used as credit when you file
3. Expenses — if you deduct actual expenses you need evidence such as tax invoices and receipts
4. Allowances — insurance, funds, donations and other documents valid for that year
5. Other — contracts, accepted quotations, transfer evidence

File immediately, name files so you can find them

• Whenever you get a document, photograph/save it into the folder that day
• Name it year-month-day_who_what_amount, e.g. 2026-03-15_CompanyA_50Tawi_1500
• At each month end, add up income and tax withheld in one sheet

Before filing

• Total the year's income from the sheet and check you have a 50 Tawi certificate from every payer
• Chase payers who haven't sent their certificates early in the year, not on the last day