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The MooMooNext guides hub collects practical guides for Thai online sellers and accountants. Right now it has a VAT-basics guide for SMEs and a guide on working with an accountant, plus answers to common questions about commercial registration, company certificates, when to switch from an individual to a registered company, marketplace reconciliation, and preparing documents before handing them to an accountant. Each topic is explained in plain language and says clearly when it needs a follow-up with an accountant or the relevant government office. This is not complete legal or tax advice.

Thai SME owners and Thai accountantsLast updated 2026-07-21

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VAT basics: input tax vs output tax for SMEs

Getting data ready before working with an accountant

Commercial registration and company certificate paperwork

When to switch from individual to registered company

Reconciling marketplace records before handing off your books

Getting documents ready before sending them to an accountant

Keeping monthly records organized from day one

Tax terms and forms that come up often

What documents are needed to register a commercial business (จดทะเบียนพาณิชย์)?

Commercial registration with your local authority (municipal office or district office) typically requires the business owner's ID card and house registration, a map or address of the shop or place of business, and a lease agreement if you don't own the premises. Documents and forms can vary by area, so it's worth checking with your local registration office again before preparing the paperwork.

When should you switch from individual to a registered company?

Owners typically start considering this once income approaches the VAT-registration threshold, once they want to clearly separate personal assets from the business, or once a trade partner requires a contract in the name of a registered company. The decision depends on each shop's income structure, expenses, and business plan, so it's worth talking to an accountant or tax advisor before actually changing status.

What is a company certificate used for, and where do you request one?

A company certificate confirms your registered company status — for example, to open a bank account in the company's name, sign contracts with trade partners, or file documents with government agencies. You can request one from the Department of Business Development (DBD), either in person or through the DBD's online channel.

Do you need to reconcile marketplace data every month before sending it to your books?

Yes, doing it every month is a good habit. Sales from Shopee, Lazada, TikTok Shop, or LINE MyShop usually have fees, shipping, ads, and refunds deducted before the actual payout hits your account. Reconciling keeps the numbers you hand to your accountant matching what you actually received, and avoids mismatches when closing the books.

What should you prepare before sending documents to your accountant?

Gather receipts, tax invoices, sales reports from each marketplace, and that month's transfer slips, with rough context and a category noted on each item. This helps your accountant review faster and ask fewer follow-up questions.

Who are these guides for?

These guides fit online shop owners, freelancers, and SMEs who handle their own accounting and tax matters, as well as accountants who want to see things from the owner's side. The content focuses on explaining the overview and practical steps — it is not case-specific advice that replaces consulting a professional.

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