Accounting service
Read the summons, assemble evidence, explain the figures and prepare the appeal on time.
When a summons or assessment notice arrives, our accounting and tax team reviews it, assembles the evidence, explains the figures alongside you, and prepares the appeal within 30 days (Section 30). Fees are quoted before work starts; Tax Court litigation is referred to the legal team at tla.co.th.
Need a scope assessment? Describe the accounting or tax issue, relevant periods and due dates so the checks, required records and responsibilities can be clarified before a meeting.
Discuss your scope
AI Quick Answer
When a summons or assessment notice arrives, our accounting and tax team reviews it, assembles the evidence, explains the figures alongside you, and prepares the appeal within 30 days (Section 30). Fees are quoted before work starts; Tax Court litigation is referred to the legal team at tla.co.th.
Quote-based — Quoted before work starts · Per the deadline stated in the RD notice
Related subject area
Head of Tax
Tax subject area
This area concerns corporate tax, VAT and tax-document preparation. It is not an entity-specific document review or confirmation of a Tax Auditor licence, and excludes litigation.
Supporting subject area
Head of Accounting
Financial statements and TFRS for NPAEs specialist
This role is not evidence of an individual reviewing this page. Consult its scoped references · content date 2026
View role scopeIf you handle it yourself
Incomplete records, an inapplicable rule or delayed approval can affect filing and tax payments. The issues below are review points for defining an engagement, not reports of any client's results.
Statements are recorded and used at assessment stage; they are hard to walk back.
How we prevent it: We prepare a written submission and attend with you every time.
An assessment appeal must be lodged within 30 days of receiving the notice; after that the right to contest is lost.
How we prevent it: Provide notice receipt and response dates for staff to assess before accepting the engagement; start time is not guaranteed. Appeals and litigation require a separate scope with tla.co.th.
How it works
Confirm what is requested, by when, and under which section.
Reply on time: ignoring a summons without good reason lets the officer assess at discretion (Section 71).
Check assessed figures against evidence and consider a penalty-reduction request under current rules.
File within 30 days of receiving the notice; if a Tax Court case is needed we refer to the legal team at tla.co.th.
Compare your options
| Aspect | Do it yourself | In-house staff | Work with us |
|---|---|---|---|
| Total annual cost | Looks free, but costs the owner's time and carries penalty risk | Assess actual payroll, employer contributions, software and cover arrangements rather than assuming one annual cost | Request a staff quotation that identifies scope and any additional items before agreement |
| Continuity | Stops the moment the owner gets busy | Staff turnover takes the institutional knowledge with them | Agree engagement owners, handover arrangements and traceable document storage |
| Review layer | Nobody double-checks | Self-review only, rarely an outside perspective | Preparer and reviewer within scope; audit work separately assigned to a CPA Partner (tax audit defence) |
| When the Revenue Department calls | You attend and answer alone | In-house staff rarely have hearing experience | Prepare evidence and explanations within scope; attendance depends on authorization and taxpayer duties |
An adviser, not just a filer
Review the notice and assemble evidence against the officer's requests, identifying missing records and response dates. This scope supports figures and explanations, without assured assessment outcomes or litigation.
Let us handle it allTips you can apply today
FAQ
Check exactly what is requested and the deadline, gather that year's statements, returns and bank records, and bring someone who knows the numbers. The RD may summon within 2 years of filing, extendable to 5 years in some cases (Section 19).
No. Without good reason the officer may assess at discretion (Section 71). If you need more time, request a postponement in writing with reasons before the deadline.
File with the Board of Appeals within 30 days of the notice (Section 30). If you disagree with the ruling you may go to the Tax Court; we refer that stage to the legal team at tla.co.th.
Surcharge is 1.5% per month or part month on unpaid tax (Section 27). Penalties depend on the tax and facts, e.g. one or two times the shortfall, and may be reduced under the RD's current rules.
No. We are an accounting firm handling figures and records; litigation is referred to the legal team at tla.co.th.
Where a return was filed, a summons may be issued within 2 years, extendable to 5 with the Director-General's approval when returns are believed inaccurate. Where no return was filed, assessment reaches back 10 years. Penalties run to 2x the tax plus a 1.5% monthly surcharge. We attend on your behalf and apply for penalty reduction under the published criteria.
File a Form Por.Sor.6 appeal with the Appeal Committee within 30 days of receiving the assessment notice; if the ruling is still unfavourable, sue in the Central Tax Court within 30 days of the ruling. Both deadlines are strict. Being an accounting firm and a law firm in one, we control both the working papers and the litigation strategy.
These original sources address the issues described under each reference; they do not certify every statement or a service outcome. Check amendments and the conditions applicable to the entity's actual circumstances.
1. Code
The Revenue CodeThe Revenue Department
The governing text for income tax, VAT, specific business tax and stamp duty, together with the ministerial regulations and departmental instructions issued under it.
Scoped source check, not whole-page certification:
Deep-dive knowledge on this subject
The questions clients actually raise on this kind of engagement, answered with the deadlines, paperwork and penalty figures attached.
Related services
Review applicable tax relief, BOI conditions and treaty eligibility against the business facts.
View service detailsRecords and schedules ready so the independent auditor can finish before the shareholders' meeting.
View service detailsCheck disclosure duties and organise pricing evidence for actual domestic and cross-border related-party transactions.
View service detailsReal engagements
Read the letter for the tax year, documents and deadline, then reconcile revenue monthly across four sources: P.P.30, financial statements, PND.50 and bank deposits. Every gap needs a reason and evidence, such as directo
Written by the people who do the work
Every article states its author, its reviewer, and when it was last revised, so you can check who is accountable for the advice and what qualifies them.
ภาษี / Tax
An SME document checklist covering VAT, withholding tax and corporate income tax issues, not a report of actual client cases.
Head of Tax
Tax subject area —
6 min
Accounting
The sequence from pre-year-end reconciliations to the shareholder meeting and filings, with deadlines under the Civil and Commercial Code and Revenue Code.
Head of Accounting
Financial statements and TFRS for NPAEs specialist —
5 min
ช่วยด่วน / Emergency
Work out which section the summons cites, what it asks for and by when, then answer in writing before meeting the officer.
Head of Tax
Tax subject area —
7 min
What owners ask before deciding
Continue by what you need to do next
Open a filing guide if you are submitting yourself, or a definition if a document name is still unclear.
Related topic map
Authorities and terminology behind this page
These original sources address the issues described under each reference; they do not certify every statement or a service outcome. Check amendments and the conditions applicable to the entity's actual circumstances.
1. Code
The Revenue CodeThe Revenue Department
The governing text for income tax, VAT, specific business tax and stamp duty, together with the ministerial regulations and departmental instructions issued under it.
2. Notification
Royal Thai Government GazetteRoyal Thai Government Gazette
Where the authentic text of every act, decree, ministerial regulation and notification is published.
3. Code
Civil and Commercial CodeOffice of the Council of State
The provisions on partnerships and companies, shareholder meetings, dividends and the statutory reserve.
Related subject area Head of Accounting · Financial statements and TFRS for NPAEs specialist · not evidence of a page-specific reviewer or review date
Initial consultation for a quotation via LINE, phone, or email.
Contact us