Full-Service Thai Accounting Firm · Bookkeeping, Tax, Audit
NYC Legal delivers full-cycle accounting, tax, and payroll services by CPD-registered accountants and CPA auditors — covering Thai SMEs, BOI companies, foreign branches, and expat/freelance clients. We e-file 100% on time through Revenue Department and DBD portals, backed by THB 5M professional indemnity insurance.
Quick answer
8 services: (1) Monthly bookkeeping quoted after document review; (2) Full corporate tax filing; (3) Payroll from THB 150/person; (4) CPA-signed annual audit; (5) Personal income tax incl. expat & LTR; (6) Tax refunds until paid; (7) 1–5 year books cleanup; (8) OECD-aligned Transfer Pricing.
8 Accounting, Tax & Payroll Services
Monthly Bookkeeping
TFRS for NPAEs + VAT/WHT/SSO monthly · quoted after document review
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Corporate Tax Filing
PND.50/51 · PP.30 · WHT · full e-Filing
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Payroll Service
SSO + Provident Fund + e-payslip · quoted per employee
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Annual Audit
CPA-signed · DBD + Revenue on-time 100%
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Personal Income Tax
PND.90/91/94 · expat & LTR-ready
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Tax Refund Claims
VAT/CIT/PIT · end-to-end · 3–6 months
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Books Cleanup
1–5 year catch-up + penalty relief negotiation
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Transfer Pricing
Master File · Local File · CbCR · Disclosure Form
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Frequently asked accounting & tax questions
What does monthly bookkeeping cost at NYC Legal?
quoted after document review for companies with up to 30 monthly transactions. Includes TFRS for NPAEs bookkeeping, VAT/WHT/SSO filing, and monthly trial balance. Price scales with volume and industry.
What corporate tax filings are required each year?
Four core filings: (1) PND.51 half-year (Aug), (2) PND.50 annual (May), (3) PP.30 monthly VAT, (4) PND.53/3 monthly WHT. BOI companies add promotion reports + Transfer Pricing Disclosure Form.
How do expats file personal income tax in Thailand?
Expats staying over 180 days/year must file PND.91 (salary) or PND.94 (freelance) by March. LTR-visa highly-skilled professionals qualify for a flat 17% rate. We handle both filing and tax planning end-to-end.
Is a CPA-signed audit really required?
Yes — every Thai Ltd is legally required to have CPA-audited annual financials, filed with DBD within 5 months of year-end and with Revenue Department along with PND.50 within 150 days. Our CPAs sign and file with a 100% on-time record.
How far back can you catch up bookkeeping, and what are the penalties?
We reconstruct 1–5 years of records. Penalties can reach quoted per year on PND.50 plus 100–200% VAT surcharge. Our team negotiates typical 50–70% reductions with monthly settlement plans.
Who is subject to Transfer Pricing rules and what must you file?
Thai companies with revenue over THB 200M and related-party transactions must file the Disclosure Form with PND.50, prepare Local File (on request), and Master File if part of an MNE group with THB 28B+ consolidated revenue — aligned with OECD BEPS Action 13.
Need a monthly bookkeeping quote?
Call +66 83-249-4999 or LINE @NYC168 · Initial 15-minute assessment
Talk to our teamThai accounting firms: statutory duties, filing cycle and where penalties come from
Every Thai company must keep books under the Accounting Act, appoint a qualified bookkeeper, have annual financial statements audited by a licensed CPA, file those statements with the Department of Business Development and file tax returns with the Revenue Department. Most penalties come not from the tax figure but from late filing, missed forms or unsupported entries.
Key facts at a glance
| Item | Detail |
|---|---|
| Who is responsible | A qualified bookkeeper, plus a licensed CPA auditor for the annual statements |
| Common returns | PND.50 (annual) · PND.51 (half-year) · PP.30 (monthly VAT) · PND.1/3/53 (withholding) |
| Social security | Monthly employer and employee contributions for registered staff |
| Financial statements | CPA-audited, then filed with the DBD within the statutory period after the shareholders' meeting |
| Standards | TFRS for NPAEs for ordinary companies; full TFRS for publicly accountable entities |
| Records to keep | Tax invoices, receipts, contracts, bank statements and the fixed asset register |
| Contact | Call Center 083-249-4999 · LINE @NYC168 · Contact@nyclegal.co.th |
How the process runs
- Review the company profile: VAT registration, headcount, cross-border transactions
- Set up the monthly document flow and a chart of accounts that fits the business
- Post entries, reconcile bank accounts and file monthly returns on time
- Close quarterly so the real profit is visible before year end
- Hand the books to the auditor and clear every audit query
- File the audited statements with the DBD and the annual return with the Revenue Department
Why files get rejected
- Late filing or a missed half-year return, triggering surcharge and penalty
- Expenses with no tax invoice or receipt, added back as income
- Cash records that do not reconcile to bank statements
- Withholding tax at the wrong rate, or no withholding certificate issued
- Staff not registered for social security, or contributions underpaid
Send your current books and filings for review. We will point out where penalty risk sits and what to prepare before the next filing deadline.
Accounting & Financial Statements: documents, steps and cautions
Documents you need
- Current company affidavit and memorandum of association
- Complete income and expense records with tax invoices
- Company bank statements covering the whole accounting period
- Fixed-asset register with depreciation details
- Payroll, social security and withholding-tax details
Step-by-step procedure
- Case assessment: define the end purpose and confirm that Bookkeeping, annual financial-statement closing and filing with the required agencies is what the receiving party actually requires.
- Collect and pre-check every document so names, dates and spelling match before filing with the Department of Business Development and the Revenue Department.
- Prepare translations or supporting papers in the prescribed format, then have a second reviewer verify them.
- File with the Department of Business Development and the Revenue Department through the channel currently open, keeping proof of every submission.
- Track status, answer officer queries and correct documents immediately if anything is challenged.
- Collect the result, verify it before forwarding, and archive a complete set for future reference.
Common pitfalls to avoid
- Expenses without supporting evidence get reclassified as non-deductible
- Book balances that do not reconcile to bank records delay the closing
- Missing the agency's filing deadline creates penalty exposure
- Using different document sets for the statements and the tax returns
- Not retaining original records for the period the law requires
We advise, not just file
We do not simply process paperwork — we advise throughout the case. With more than 15 years of experience we review your documents before anything is filed, flag where rejection risk sits, and sequence the full chain end to end. If you would rather not run the process yourself, send the documents for a no-obligation review first.
Send your documents for a free pre-check →Read the full playbook →