OSP LEGAL: Law firm you can TRUST
Run your business with confidence.Trust OSP LEGAL with your accounting and tax needs.
Free Consultation. Confidential. No Obligation.
We recognize your concerns regarding
Accounting, Tax, and Social Security.
We recognize your concerns regarding Accounting, Tax, and Social Security.
Complexity and Workload
- Regulations change frequently. Are you finding it difficult to stay compliant?
- Are you overwhelmed by the volume of accounting documents and noticing an increase in costly errors?
Risks and Penalties
- Are you concerned that accounting or tax errors may result in fines or legal issues?
- Are you unsure whether your records are ready for an audit?
Lack of In-Depth Expertise
- Are you operating without an expert and missing out on potential tax benefits?
- Are you relying on basic bookkeeping and lacking the data and insights needed for confident financial decisions?
Accounting, Finance, and Tax Services for Your Business
OSP LEGAL ให้บริการด้านบัญชีและภาษีอย่างครบวงจร เพื่อช่วยให้ธุรกิจของคุณดำเนินไปอย่างราบรื่น ถูกต้องตามกฎหมายและมาตรฐานที่กำหนด ลดภาระความยุ่งยาก ให้คุณมีเวลาโฟกัสกับการเติบโตของกิจการได้อย่างเต็มที่
Ensure your business has accurate, complete, and systematic financial records — ready for management decisions, audits, and tax filing. Our bookkeeping and accounting services cover every step of the process.
- Accounting system and document setup: consult and establish document workflows suited to your business.
- Transaction recording: verify and record all transactions from source documents (tax invoices, receipts, bank statements) accurately.
- General ledger accounting and asset registration: categorize entries and calculate asset depreciation.
- Bank reconciliation: verify the accuracy of key accounts.
- Guidance on proper document storage for accounting and tax compliance.
Reduce tax risks with expert tax consulting services and strategic corporate tax planning to maximize legitimate benefits.
- Tax analysis: review all applicable taxes (corporate income tax, VAT, WHT, specific business tax).
- Tax document and form preparation: ensure accurate and compliant filing.
- Monthly and annual tax filing services (PND 30, PND 1/53, PND 50/51).
- Strategic tax planning: analyze financial data and business structure for legal tax optimization.
- Business structure advisory for tax efficiency (for complex businesses).
Build credibility with financial statements prepared in accordance with TFRS financial reporting standards — for shareholders, investors, annual tax filing, or loan applications.
- Year-end account review and adjustments (accrued expenses, depreciation) with adjusted trial balance.
- Full financial statement preparation: balance sheet, income statement, statement of changes in equity, and cash flow statement with notes per standards.
- CPA audit support: coordinate and prepare documentation for certified public accountants.
Reduce complexity, minimize errors, and ease the administrative burden of employee social security compliance.
- Employer registration and employee enrollment with the Social Security Office.
- Filing for employee changes: new hires, resignations, and personal data updates.
- Monthly contribution calculation, reporting, and timely submission.
- Advisory on employer obligations and employee benefits under social security law.
Why Clients Select OSP LEGAL for
Accounting and Tax Advisory Services
Why Clients Select OSP LEGAL for Accounting and Tax Advisory Services
Experienced Accounting Professionals
Our accounting consultants deliver accuracy, precision, and efficiency, drawing on extensive experience with accounting and tax systems across diverse businesses and industries.
Specialized in Accounting and Tax Law
Receive expert support from professionals with in-depth knowledge of tax law, TFRS financial reporting standards, and related regulations. We also provide guidance on audit preparation and compliant record-keeping.
Proven Track Record with Over 1,000 Cases
We have successfully managed over 1,000 matters, providing clients with confidence in our ability to address complex accounting and tax challenges.
Outstanding Client Reviews
We consistently receive high ratings from business clients who trust us to manage their accounting and tax affairs, ensuring smooth and reliable operations.
Transparent and Efficient Process
All details are communicated upfront, including fees, timelines, and procedures. There are no hidden charges or unexpected costs.
Expertise in Both Domestic and International Matters
Our team navigates both Thai regulations and cross-border transactions with confidence and precision.
Comprehensive End-to-End Tax and Accounting Services
As one of Thailand's trusted outsourced accounting firms, we handle bookkeeping, tax filing, financial statement preparation, and social security administration, so you can focus on your business.
Committed to Protecting Your Rights and Compliance
We handle all accounting and tax matters accurately and in full compliance with the law, safeguarding your business throughout the process.
Accessible, Friendly, and Approachable Counsel
Accounting and tax can be straightforward. Our business tax advisors provide clear explanations of complex issues and are always available to answer your questions.
OSP LEGAL’s Approach to Accounting and Tax Services
1
Set Up Accounting & Tax System
- We will consult with you to understand your business, identify applicable taxes, set up your accounting system and document workflow, and define the service scope and timeline.
2
Monthly Accounting and Tax Operations
- Collect and verify source documents, record transactions, prepare reports, file monthly tax returns, and deliver monthly financial summaries.
3
Year-End Financial Statement Closing
- Close annual accounts, review and adjust entries, prepare financial statements in compliance with TFRS, and coordinate with your CPA auditor.
4
Annual Tax Filing and Ongoing Advisory
- We file annual tax returns, prepare comprehensive reports, and provide year-round business tax advisory and consulting services.
Frequently Asked Questions:
Accounting and Tax Services
What does OSP LEGAL's monthly bookkeeping service cover? Does it include monthly tax filing?
Our monthly service covers transaction recording, general ledger accounting, bank reconciliation, and typically includes monthly tax filing (e.g., PP 30 VAT, PND 1/3/53 WHT) and social security submissions. The exact scope is defined in the service agreement.
Are SMEs and startups legally required to keep accounts and have financial statements audited?
What documents do I need to provide each month?
What does legal tax planning involve?
Who is responsible if errors occur in tax or social security filings?
How does OSP LEGAL determine fees for accounting and tax services? Are packages available?
Case Studies & Testimonials
“I almost lost nearly 400,000 baht in condo down payments. OSP LEGAL helped me get every baht back!
When I received a letter canceling my condo purchase agreement and stating that my nearly 400,000-baht down payment would be forfeited, I was shocked and stressed. The developer claimed I had failed to show up for the transfer, even though I never received any notice of the transfer. It felt like I was about to lose a huge sum for nothing, and I had no idea what to do.
Fortunately, I found OSP LEGAL. The team listened carefully and thoroughly reviewed the purchase agreement and the developer’s mailing records. The turning point came when OSP’s attorneys discovered that the developer had sent the transfer notice to an “alternate address” — not the address specified in the contract, and I had never submitted a written change of address. This meant the notice was invalid under the contract.
OSP LEGAL filed a lawsuit on my behalf, arguing this critical error. The court ruled in my favor and ordered the developer to refund the full 392,800 baht plus interest.
I felt an enormous sense of relief and am deeply grateful to the OSP LEGAL team for catching a small but crucial detail that made all the difference. I highly recommend OSP LEGAL to anyone facing a real estate contract dispute. They are thorough, professional, and they truly deliver results.
Ms. A
(Name withheld for privacy)
I am incredibly grateful for the outstanding services provided by OSP LEGAL. As someone who has practiced law in the past, I can confidently say their integrity and professionalism set a high standard for legal services. I have referred their services to my friends, and I am also a client myself.
They are attentive to clients’ specific needs and responsive to gender considerations. They provide guidance based on their specialization, adhere to ethical standards, and maintain honest communication throughout the process.
Their genuine care and client-friendly demeanor made the entire experience much more pleasant than I anticipated. I have consistently received positive feedback from my friends, and I am also impressed with their services.
I wholeheartedly recommend OSP LEGAL to anyone seeking legal assistance. Their exemplary standards of integrity and professionalism shine through in every interaction.
Kohnwilai Teppunkoonngam
Client
I truly trust OSP LEGAL and Atty. Sereewat. Their integrity, dedication, and clear advice gave me confidence during a challenging time.
As a Filipina entrepreneur, I felt respected and fully supported. I believe in their work and highly recommend them.
MARIAvic
Business Owner, Philippines
“The legal team is outstanding. They understood our needs quickly, responded promptly, and gave advice that was spot-on. They gave us the confidence to move our business forward. True professionals you can trust.”