Professional accounting & reporting services in Thailand

In a business environment that is constantly evolving, accessing resources that complement your accounting services and finance teams is critical. You may be downsizing, expanding into a new jurisdiction, or going through a restructure. Whatever your needs, we offer outsourced accounting services in Bangkok, Thailand, and beyond, which seamlessly complement your existing team's strengths. Our accounting services in Thailand can provide you with the financial information needed to help you monitor and optimize your business performance.

Why Outsource Accounting Services in Thailand vs in-house?

Running an in-house finance team in Thailand means hiring qualified staff, keeping up with frequent amendments to the Revenue Code, managing software licences, and absorbing the cost of turnover and training. For many companies, particularly foreign-invested businesses and growing SMEs, the volume of accounting work does not justify a full finance department year-round, yet the compliance exposure is identical to that of a large corporation.

Accounting outsourcing in Thailand gives you access to a qualified team, built-in continuity cover, and regulatory expertise at a predictable monthly cost. You avoid recruitment cycles, pay only for the capacity you use, and gain the ability to scale up during year-end, audits, or expansion phases without restructuring your team. For companies with a parent entity overseas, outsourcing also solves the language barrier and ensures your Thai books can be reconciled cleanly to group reporting standards.

Our Professional Accounting Services Approach

There are times when businesses in Thailand can benefit from outside support with professional accounting services and reporting. In today's dynamic market environment, you may be looking for extra help after streamlining your finance team, expanding into new markets, or going through a merger, acquisition, or divestment.

Accounting outsourcing in Thailand allows you to focus on your core business. We offer the accounting continuity and quality that enables you to concentrate on growing your business confidently and transparently.

No matter your situation, you still need access to the critical information necessary to run your business – and you also want to ensure that your monthly bookkeeping and reporting functions are properly resourced. We work closely with your management to provide accounting services that are integral to maintaining the success of your business.

Forvis Mazars is an experienced provider of outsourced accounting services in Thailand. We offer accounting services in Bangkok and beyond that meet your unique needs and fit with your existing functions. By having a complete understanding of Thai tax laws and financial regulations, we work with your company as a trusted advisor to provide and ensure compliance with all applicable laws and regulations. Our tax and accounting services in Thailand combine deep local regulatory knowledge with the technical rigor expected by multinational groups.

As an international accounting firm in Bangkok, Thailand, we have a team of finance specialists who work with companies across multiple jurisdictions. We will coordinate relationships across all your respective country offices to ensure you always receive consistent and integrated accounting services.

When you work with us, the service you receive is crafted to you and your business. You may need assistance preparing management reports, or you may want outsourced accounting services in Thailand to help with your monthly bookkeeping and reporting functions. Our accounting team is committed to providing the right level of support. This includes providing you with interim resources on a flexible basis. For example, if you need a high-level accounting manager but are struggling to find the right candidate, your Forvis Mazars team can step in to help.

Our outsourced accounting experts in Bangkok, Thailand, come from a wide range of industries and backgrounds. We can build an accounting services team to suit your needs – whatever the size of your company.

Who Our Outsourced Accounting Services are for

Our clients in Thailand range from early-stage startups preparing their first set of books through to listed multinationals consolidating Thai entities into a global group. Typical engagements include:

• Foreign-invested subsidiaries that need Thai statutory compliance while reporting up to an overseas parent in IFRS or US GAAP.
• BOI-promoted companies managing the additional reporting conditions attached to their investment incentives.
• SMEs and growth-stage businesses that have outgrown a bookkeeper but do not yet need a full finance department.
• Companies going through restructuring, M&A, or finance team transitions that require interim accounting capacity.
• Holding and special-purpose entities where transaction volume is low but statutory filing obligations still apply.

How Outsourced Accounting Services Work in Thailand

• At the start of the engagement, we agree on a reporting calendar, document workflow, and chart of accounts aligned to both your Thai statutory needs and group reporting format.
• Each month, your team forwards source documents (invoices, bank statements, expense claims, and contracts) through cloud storage or directly into Xero.
• Our team records transactions, reconciles bank and control accounts, prepares VAT and withholding tax filings, and delivers a management reporting pack by your agreed deadline.
• At year-end, we prepare audit-ready financial statements and coordinate directly with your appointed auditor.

We offer broad outsourced accounting services in Thailand that includes:

• Ensuring you remain compliant with local statutory compliance requirements
• Compiling reports that are provided at set monthly deadlines and include the specific information you need.
• Giving you the peace of mind that internal and external reporting is accurate and offers the transparency that your stakeholders require;
• Providing outsourced accounting services in Thailand for day-to-day accounting and tax compliance, as well as for more complex tasks.
• Supporting your finance and accounting transformation; and
• Providing resources on secondment, where needed.

We ensure that your company is fully compliant with the financial regulations of Thailand by handling monthly tax filing in Thailand and preparing all monthly submissions required by the Thai Financial Reporting Standards (TFRS), including:

• Balance sheet
• Bank reconciliation
• Customer aging report
• General ledger
• Journal
• Profit and loss statement
• Suppliers aging report
• Supporting accounting schedules
• VAT (PP30 and 36)
• Withholding tax (PND 1, 3, 53, 54)

Benefits of engaging our outsourced accounting services experts include:

• Focusing on your core business allows your company to remove obstacles including time and resource constraints. By using our outsourced accounting services, your business can focus on other important matters.
• Converting fixed costs into variable costs and increasing your flexibility when adapting to the fast-changing business environment.
• Our outsourced accounting services are delivered efficiently, which can help to increase your profits.
• Giving your company access to operational and technological expertise and best practices that can be difficult and time-consuming to develop in-house.
• Avoiding the absence or departure of staff members that can cause disruption. Our outsourced accounting services guarantee continuity of service.
• Having specialist know-how tailored to your individual needs, including the opportunity to engage with our expert tax consultants and lawyers.
• Industry know-how in key sectors such as retail, manufacturing, construction, and software development, as well as handling the specific requirements of companies receiving investment incentives from the BOI.
• Having a personal, partner-led approach to answer your questions and to build a relationship with, adds value to your organisation.
• Having access to our integrated global partnership, which allows us to work closely with our colleagues across the Asia-Pacific region and the rest of the world, to provide clients with seamless multi-country solutions.
• Working with the first accounting company in Thailand to become a Xero platinum partner. All of our staff are Xero certified.

Our accounting & reporting services

We offer a full range of accounting and reporting services, including:

• Accounting and tax compliance;
• Budgeting and forecasting;
• Support on business set-up;
• Chartered accountancy and bookkeeping;
• Migration and translation of accounts; 
• Statutory financial statements and related services;
• GAAP conversion (e.g. IFRS, US GAAP to Thai GAAP);
• Management reporting;
• Consolidation of group accounts;
• Cost accounting and performance management. 

Our outsourced accounting tools and solutions 

Forvis Mazars was the first accounting firm in Thailand and Southeast Asia to achieve Xero Gold Partner status, and today we operate as an award-winning Xero Platinum Partner. Our team includes over 120 Xero-certified staff, and at Xerocon 2018, we were recognized as Xero's first Regional Partner of the Year for Asia. This long-standing Xero capability means your accounting records sit on a cloud platform you can access at any time, with real-time dashboards, automated bank feeds, and integrated invoicing.

For clients who require enterprise-grade systems, our team works across Xero, SAP, Oracle, NetSuite, Microsoft Dynamics, and other platforms used by international groups. We have also extended Xero for Thai market conditions, including the ability to issue electronic tax invoices and e-receipts generated directly from Xero. Where clients need approval workflows for accounts payable, we integrate Xero with ecosystem partners such as ApprovalMax and other best-in-class applications for inventory, POS, and project management.

Why Choose Forvis Mazars As Your Accounting Firm In Bangkok?

Forvis Mazars in Thailand is part of Forvis Mazars Group SC, a leading professional services network operating as an internationally integrated partnership in over 100 countries and territories, with more than 40,000 professionals globally. Locally, our clients work with 400+ Thailand-based specialists drawn from audit, tax, legal, and advisory backgrounds.

Choosing Forvis Mazars for your professional accounting services in Thailand gives you:

• A single, partner-led point of contact for your Thai accounting, tax, and reporting needs;
• In-house access to tax consultants and lawyers when Revenue Department inquiries, BOI compliance, or contract reviews arise;
• Multi-jurisdiction coordination through our global network, useful where a Thai subsidiary is one of several entities to manage;
• Industry experience across retail, manufacturing, construction, software, hospitality, and BOI-promoted sectors;
• Xero Platinum Partner capability combined with the technical rigor of an international audit-linked network.

Get In Touch

If you would like to understand how our outsourced accounting services in Thailand can help you and your business, please contact us today.

FAQ

Q: What is the minimum accounting and tax filing requirement for a company in Thailand with very few transactions?

A: Every registered limited company in Thailand must maintain accounting records under the Accounting Act B.E. 2543, appoint a licensed Thai CPA auditor, file an annual corporate income tax return (PND 50) and a half-year return (PND 51), and submit audited financial statements to the Department of Business Development (DBD) each year, regardless of transaction volume. Monthly withholding tax filings (PND 1, 3, 53, 54) are required whenever payments trigger a withholding obligation, and VAT returns (PP30) are required only if the company is VAT-registered. Social Security contributions must also be filed monthly if the company has employees.

Q: Can you support both Thai statutory reporting and group reporting under IFRS or US GAAP?

A: Yes. We prepare statutory financial statements under Thai Financial Reporting Standards (TFRS) and deliver parallel reporting packages for group consolidation under IFRS or US GAAP. Our GAAP conversion service handles the reconciling adjustments between Thai GAAP, IFRS, and US GAAP at each period end, so your Thai entity closes cleanly into the group.

Q: How does monthly outsourced accounting services in Thailand typically work in practice?

A: At the start of the engagement, we agree on a monthly reporting calendar, document workflow, and chart of accounts. Each month, your team forwards source documents through cloud storage or directly into Xero. Our accountants record and reconcile transactions, prepare VAT and withholding tax filings, and issue a management reporting pack by the agreed cut-off date. Month-end reviews are supervised by a manager, and a partner signs off on the final deliverables.

Q: Can an outsourced accounting firm help during a tax audit or Revenue Department inquiry?

A: Yes. Because our accounting services in Thailand sit within a broader professional services firm, our accounting team can escalate directly to our in-house tax consultants and lawyers when a Revenue Department query or tax audit arises. We help prepare supporting documentation, draft responses, and represent your position during the process. Maintaining your books to audit-ready standards throughout the year reduces the risk of adjustments and penalties.

Q: What does monthly tax filing in Thailand involve?

A: Monthly tax filing in Thailand typically includes VAT returns (PP30) for VAT-registered companies, cross-border VAT self-assessment (PP36) where applicable, and withholding tax returns covering payroll (PND 1), domestic payments to individuals and companies (PND 3 and PND 53), and overseas payments (PND 54). Filing deadlines fall on the 7th of the following month for withholding tax and the 15th for VAT, with extensions of up to eight additional days available for e-filing through the Revenue Department's online system.