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Monthly Tax Advisory Retainer

A Tax Advisor on Retainer
Like Having Your Own In-House Tax Department

Ongoing, month-by-month care of your taxes — from filing returns, planning, and representation before the Revenue Department to tax disputes and international tax — under a monthly package designed around each organization's business profile and transaction volume.

Designed and supervised by Eksiam Chaisorn · Legal Consultant · 25+ years of experience
I.

Tax retainer packages in three tiers

Three retainer tiers — calibrated to business scale

The three packages are designed to cover the needs of businesses from newly established SMEs to mid-sized and large organizations and multinational groups. At every tier, the firm's team of lawyers and legal consultants reviews the work and is responsible for it. Where the nature of the work does not fit any of the three packages, a bespoke package can be designed.

Tier I · Basic Compliance

Tax compliance

Small businesses · newly formed companies
SMEs with uncomplicated income

Suited to businesses that want assurance that every type of tax return is correct and filed on time, with a lawyer and tax law consultant reviewing each return before it is filed.

Included services
  • Monthly P.P. 30 filing (VAT)
  • Monthly P.N.D. 1, 3, and 53 filings
  • Accuracy review before every filing
  • Advance reminders of filing deadlines
  • Answers to general tax questions via LINE / email
  • Quarterly tax summary report
Not included in this package
  • P.N.D. 50 (annual) / P.N.D. 51 (half-year) filing
  • Meetings with Revenue Department officials
  • Annual tax planning
Request a quote
Fees are confirmed in writing, according to the scope of work, before work begins
Tier III · Tax Counsel Retainer

Enterprise tax counsel

Mid-sized to large companies · multinational businesses
Corporate groups

Enterprise-level tax law advisory covering both domestic and international tax, full-scope transfer pricing, tax disputes and appeals, and dealings with every type of tax authority.

Everything in Tier II, plus
  • Full-scope international tax and transfer pricing
  • Unlimited meetings with Revenue Department officials
  • Tax disputes and appeals included in the package (up to 1 case per year)
  • Annual tax risk assessment with a written report
  • Unlimited contract reviews
  • Advice on customs duty and excise tax
Request a quote
Fees are confirmed in writing, according to the scope of work, before work begins
II.
Contents
  1. Comparing the services in each package
  2. Getting started within one week
  3. Why choose a monthly package
  4. Frequently asked questions

Comparing the services in each package

A side-by-side view of what is included at each tier

The table below shows the scope of services in each package. Where your transaction volume or business profile falls between two tiers, the package can be tailored to your needs.

Service Tier IBasic
Compliance		 Tier II · RecommendedTax + Accounting
SME		 Tier IIITax Counsel
Retainer
i.Tax filings
Monthly P.P. 30 and P.N.D. 1, 3, 53 filings ✓ ✓ ✓
P.N.D. 50 (annual) / P.N.D. 51 (half-year) filing — ✓ ✓
Amending tax returns Case by case ✓ ✓
ii.Tax planning
Annual tax planning — ✓ ✓
Analysis of the tax consequences of transactions — ✓ ✓
International tax and transfer pricing — Preliminary Full scope
iii.Representation before tax authorities
Meetings with Revenue Department officials on your behalf — Up to 2 per year Unlimited
Responding to letters and giving explanations to the Revenue Department — ✓ ✓
iv.Tax disputes and appeals
Disputing notices of tax assessment — Case by case Included in the package
Litigation in the Central Tax Court — — Up to 1 case per year
Customs duty and excise tax — — ✓
III.

Getting started within one week

From first call to live retainer in four steps

The onboarding process is designed to be streamlined. Clients begin receiving services the following month without having to prepare extensive documents — only basic information about the business at the first meeting.

I.
Assessment and package design
A meeting to understand your business profile, transaction volume, and needs, followed by the design of a suitable package and a quotation within 24 hours.
II.
Engagement agreement and handover of information
Signing of the tax advisory agreement and a power of attorney, together with the handover of documents and past tax information so that the team understands your current position.
III.
Service begins in the first month
The team handles every type of filing on schedule, prepares a summary report on the business's tax position, and flags issues to watch in the following month.
IV.
Quarterly reporting and review
Every quarter, the tax position is reviewed, risks are analyzed, and plans are made for the next quarter, with a written summary report.
IV.

Why choose a monthly package

The case for an in-house style retainer

Having a tax advisor on retainer helps a business prevent problems before they arise, keeps costs predictable, and allows systematic cooperation with the client's accountant.

I.

Prevention before problems arise

  • Identify and address tax risks early
  • Plan ahead rather than fix problems after an assessment
  • Help reduce the likelihood of an in-depth audit
II.

Working with the client's accounting team

  • Coordination with the client's accounting department or bookkeeper
  • Review of tax items from a legal perspective
  • Handling explanations, appeals, and tax cases
III.

Fixed costs every month

  • Know your costs in advance and budget accordingly
  • Continuous advisory support throughout the year
  • No hidden costs
V.

Frequently asked questions

Practical questions before engaging a retainer
If the business already has an accountant, how will the firm work with them?
The firm can work alongside the client's accountant. Our scope of work focuses on interpreting tax law, tax planning, explaining and disputing matters before the Revenue Department, and tax litigation. The division of responsibilities for each task is set out clearly in the service agreement from the outset.
Can the package tier be changed during the year?
Yes. The package can be moved up or down as the business changes. The scope of work is reviewed every 6 months, or upon a significant event such as a business expansion, an acquisition, or a change in tax law that affects the business.
If a tax dispute arises during the year, how are additional costs calculated?
In Tier I and Tier II, tax disputes are charged as a separate fee according to the scope of the case, with a written quotation before work begins. In Tier III, tax disputes and appeals are included in the package, up to 1 case per year — any further case is charged at a special rate for retainer clients.
Which channels can be used for contact each month?
Tier I clients can contact us via LINE and email during business hours. Tier II and Tier III clients can contact us via LINE, email, and direct telephone — all three tiers include quarterly meetings as specified in the agreement.
How is business confidentiality protected?
All information provided by clients is subject to professional ethics and to the confidentiality terms expressly set out in the service agreement. Every member of the firm's team of lawyers and legal consultants is bound by professional ethics and confidentiality obligations.
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Not sure which package suits your business?

Tell us about your business profile and transaction volume — the team will design a package to fit your needs and send a quotation within 24 hours.

+66 81 654 5922
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