Thai tax and accounting laws can sometimes be difficult to understand, particularly if you are not familiar with Thai language. At Optimum, we provide clear and transparent services for all your tax and accounting needs in a way that not only takes care of your business requirements, but also provides professional advice and information on how to complete all tax and accounting obligations.

At Optimum, we provide clear and transparent services for all your tax and accounting needs.

In accordance with Thai law, all businesses must pay income tax on income earned from sources within and/or outside Thailand, as described on our Insights page. Optimum’s team of qualified accountants are on hand to help you with all of your taxation requirements and communications with the Thai Revenue Department. Our team has a detailed understanding of local laws, policies and working conditions, combined with extensive knowledge of professional standards and practices, providing you with the hassle-free service you require.

Our taxation services include:

  • Tax advisory, tax planning, tax return preparation and helping you to fully understand all tax concerns and compliances.
  • Coordinate and help to minimise tax liability if the Thai Revenue Department is contacting you.
  • Prepare and submit tax application as required by Thai tax law.

A qualified Thai accountant must complete all accounts in Thailand, this is according to the Accounting Act of 2000 and applies to all businesses in the country. To learn more about accounting law in Thailand, visit our Insights page. At Optimum, you’ll be provided with a team of qualified Thai accountants to take care of all your needs as required by Thai accounting law. We can create tailored reports for your individual needs as well as each report coming with a transaction detail for each account.

Our full list of services include:

  • Verify and analyse accounting transactions
  • Reconciliation of accounts
  • Financial statements and reports
  • Coordinating with an independent auditor

Optimum’s bookkeeping service is designed to help you and your business with every aspect of the accounting process. We also offer individual bookkeeping services if you need help with just one or two aspects of your accounting needs.

Our bookkeeping service will take care of the following items, adhering to Thailand accounting standards at the highest level:

  • Accounts receivable
  • Account payable
  • Reconciliation of bank statements

Optimum handles every aspect of your payroll process whilst insuring total confidentiality, meaning you don’t have to worry about missing important deadlines or falling short of Thai accounting laws and practices. Optimum provides the following payroll services for your absolute peace of mind:

  • Calculating personal tax liability according to the company calendar.
  • Preparation and provision of pay cheques or direct deposits through employee’s accounts.
  • Preparation and issuance of payroll slip.

According to Thai law, certain documents need to be correctly completed for invoices, tax invoices and receipts. All billing documentation must adhere to strict rules and regulations and provide all the correct information for the Thai Revenue Department.

Optimum has years of experience in providing our clients with the required documentation for all billing needs. We will ensure that all invoices, tax invoices and receipts are professionally and correctly completed to guarantee that your company will not come under any scrutiny by the Thai Revenue Department, which is often the case with incorrectly completed billing. Our service will save you from the hassle of completing documents that can be confusing and also time consuming.


At Optimum, we stand by our motto, ‘We work for you and with you’. If you’re searching for consultation about tax and accounting in Thailand, we’re here to provide all the advice and information that you need to fully understand Thai laws and practices. Our team of fully qualified Thai accountants take pride in their ability to help companies comply with Thai tax requirements. It not only provides better business for you and your company, but also a sense of achievement in our hard working team.


Optimum – We work for you and with you

For any questions, queries or advice about our tax and accounting services, please do not hesitate to contact us.