Bookkeeper vs auditor in Thailand, and why they cannot be the same person

Two jobs at opposite ends of the same process

A bookkeeper records transactions, keeps the ledgers, computes and files the taxes, and closes the year into a set of financial statements. An auditor examines those statements and gives an opinion on whether they fairly present the company's position.

One does the work; the other checks it. That is the entire reason they cannot be the same person.

Side by side

• The bookkeeper works with the business continuously through the year - recording, filing monthly returns, closing the accounts. They must be registered as a qualified bookkeeper and keep their knowledge current.
• The auditor comes in once a year after the close. They must be a licensed CPA, or a tax auditor (TA) for entities that qualify, and must be independent of both the company and the bookkeeper.

Why the law separates them

Independence. If the person who wrote the books also certifies that the books are right, the certification means nothing, because nobody has checked anybody. Audited accounts carry weight precisely because a disinterested third party stands behind them.

For an owner this is not only a legal box. It is protection: someone outside reviews your bookkeeper's work before anything reaches the authorities.

CPA or TA?

• A CPA can audit and give an opinion on the financial statements of any registered entity, including limited companies.
• A TA is limited to small registered partnerships that meet the statutory criteria.

If your business is a limited company, the answer is always a CPA. There is no alternative route.

Where an accounting firm sits

An accounting firm is the bookkeeper, not the auditor. A well-run one will source a licensed auditor for you, coordinate with them, field their questions on your behalf and see the accounts through to sign-off - but it does not sign the opinion itself.

If someone offers to keep your books and certify the accounts themselves, that is the moment to ask plainly who the actual auditor is and what their licence number is.

In short

Your bookkeeper is with you all year. Your auditor arrives once to check that year's work. The law keeps them independent, and that separation is exactly what makes your financial statements credible to a bank, a counterparty or a government office.