In-house vs outsourced — which is right?

In-house makes sense at 200+ entries/month. Outsource wins under 100 entries (saves salary + SSO + benefits of THB 40,000+/month). We include CPA + accountant + assistant in one price.

Which accounting software?

FlowAccount, PEAK, Express, or Xero — client's choice. If none, we recommend FlowAccount (from THB 199/month) — e-Tax ready.

When is e-Tax Invoice mandatory?

Mandatory from 1 Jan 2025 for companies with revenue > THB 30M/year. Below that, optional (but earns 200% capex tax deduction).

Haven't filed for 3 months — how to fix?

File retroactively at once. Surcharge 1.5%/month + THB 500/form. Filing before RD audit halves penalties. We handle remediation and RD negotiations.

Monthly Bookkeeping

ทำบัญชีรายเดือน (Bookkeeping) · § Bookkeeping

Quick Answer

End-to-end monthly books: journal entries, PP.30 (VAT), PND.1/3/53 (WHT), bank reconciliation, monthly P&L delivered by 15th of following month — from THB 3,500/month (≤ 30 entries).

Timeline: Monthly · books closed by 15th · tax filings due 7–15th · quarterly P&L review

Official fee: No government filing fee. Late-filing penalties: PP.30 THB 500/form + 1.5%/month interest; PND.1 late THB 200 + surcharge.

Legal Basis

Accounting Act B.E. 2543 §8, §11 — Thai Limited Companies must keep books per TFAC (NPAEs or PAEs) and retain records 5 years. Revenue Code §82/6, 83, 85 (VAT), §3-Terrs (WHT).

Who Needs This

SMEs · startups · foreign-owned entities · e-commerce sellers · incorporated freelancers · BOI/FBL companies with annual filings.

Required Documents

Original purchase & sales tax invoices
Bank statements — all accounts
Payroll slips + expense receipts
E-commerce reports (Shopee/Lazada/Line MyShop)
Service contracts + PO/invoices

Common Pitfalls

Tax invoice missing any of 8 required elements → VAT input credit denied
Skipping 3% WHT on services → company liable + 100% surcharge
Mixing personal & corporate bank accounts → RD may disallow expenses
Not filing zero-transaction PP.30 → THB 500 fine

Typical Use-cases

Startup — first 6 months post-incorporation
E-commerce store on Shopee/Lazada with THB 300K+/month
Foreign representative office / regional HQ
Freelancer using a company to invoice corporate clients

FAQ

In-house vs outsourced — which is right?: In-house makes sense at 200+ entries/month. Outsource wins under 100 entries (saves salary + SSO + benefits of THB 40,000+/month). We include CPA + accountant + assistant in one price.
Which accounting software?: FlowAccount, PEAK, Express, or Xero — client's choice. If none, we recommend FlowAccount (from THB 199/month) — e-Tax ready.
When is e-Tax Invoice mandatory?: Mandatory from 1 Jan 2025 for companies with revenue > THB 30M/year. Below that, optional (but earns 200% capex tax deduction).
Haven't filed for 3 months — how to fix?: File retroactively at once. Surcharge 1.5%/month + THB 500/form. Filing before RD audit halves penalties. We handle remediation and RD negotiations.