About Us

           At One Siri Accounting and Tax, we gather skillful accounting and tax staffs with BIG-4 background from many different types of business such as service, financial, trading and manufacturing companies, to carefully hand on the better value in accounting, tax and back-office services to our clients with over 10 years experiences.

           We provide one-stop service for your need from beginning moment to well matured period; Company registration, Accounting service, Accounting system set-up, Auditing service, Tax advisory and specific consultancy service.

Our director

Mr. Natthawat Lohapitak

  • Bachelor of accountancy from Kasetsart University with honor
  • Master of business administration from Chulalongkorn University (studying)
  • Experienced from PwC – Bangkok office, Thailand
  • Tax auditor (TA)
  • Certified public accountant (CPA)
  • Diploma in Thai financial reporting (Dip-TFRs)

Our Service

               There are 2 main types; monthly and yearly accounting and tax service.

               1. Monthly service

Starting from 1,500 Baht per month. This monthly service fits for small business who has no accounting staff, all you need to do is properly collect documents and submit to our office to accounting record and tax submission purpose in each month.


               2. Yearly service

In condition of you are capable of monthly accounting and tax submission, we can support you only year-end accounting closing service and final tax submission to comply with Thai law. The service rate would be lower than monthly fee with starting price only 3,000 Baht per year.

               At One siri, we have our own CPA and experienced accounting staffs to perform auditingservice

to specific fields of business ,for example trading, service, online platform, micro  financial, foundation,

juristic person and more.

               The auditing fee is measured by complexity and amount of transactions in each company

with starting fee only 4,500 Baht.

               We, One Siri, also provide internal auditing service to enhance and sharpen your true efficient in operation.

                  • Tax advisory: Thailand is one of the countries where tax system is literally complicated.

One Siri has tax expert to be business consultant in specific purpose, for example,

tax planning in beginning stage, advantage of avoidable tax fee, minimizing tax unit and more.

                  • Consultancy: We also offer business consultant service including accounting system,

tax planning advisory and internal audit service etc. to scale down the unnecessary process

and build up better result to your business.

                  • Training service: We provide training service especially in accounting and tax knowledge to update,

coach and prepare your team to cope with upcoming changes in accounting and tax issues.

               We serve wide range of back-office services from starting phase to matured stage of your

               • Company registration

               • Auditing service

               • Consultant service

               • Tax advisory

               • Tax or VAT registration and submission

               • Edit or adjust detail in document to follow the laws

               • Accounting record and submission to the authority

               • And many more


Auditor in bangkok ,Professional services with Ex-Big4 CPA.

Auditor Thailand

Auditor in bangkok ,Professional services with Ex-Big4 CPA.
Auditor Thailand

We provide audit service for both SME and Growth business.

Statutory audit / Special audit/ Review Package or Inventory observation in Thailand by our Perofessions.

Hundreads of business types from our clients : Construction/ Real-Estate/ Trading/ Manufacture/ Hospitality /Fianncial service and many start-up entities.

Our Former holds the CPA Thailand & Dup-TFR which less than 20 professions in Thailand.

Free download tax forms and more

Contact us

Call & Whatsapp
Call / Whatsapp: 098-281-1599
Email & Line
Email: nlohapitak@gmail.com

Line, please scan QR Code

One Siri Accounting and Tax Co.,ltd.
445 CKR Village, Soi Ruamsirimit Vipavadee-Rangsit Road Jompon Jatujak Bangkok Thailand 10900