Every company in Vietnam answers this question in the first year, usually under time pressure: do we engage an accounting firm, or hire someone?

The honest answer is that it depends on far fewer variables than the sales pitches suggest — and that the variable most people optimise for, transaction volume, is the wrong one.

What each option actually gives you

An outsourced accounting firm gives you three things: a person qualified to hold the chief accountant role, familiarity with the filing calendar, and someone else's problem when a rule changes. It does not give you availability. Your account is one of many, and month-end is busy for all of them simultaneously.

An in-house accountant gives you availability and context — someone who knows why that odd payment in March happened. It does not automatically give you compliance depth. One accountant, however good, is one person's reading of the rules, without a second opinion.

For a company of ordinary size, both options will produce a compliant set of books. The difference shows up in the awkward months.

The real decision variable is complexity, not volume

The instinct is to hire when transaction counts rise. That is usually the wrong trigger, because volume is the part a machine handles best. Two hundred purchase invoices a month is not two hundred professional judgements — it is two hundred acts of retrieval and typing, and adding a salary to absorb typing is the most expensive way to solve it.

Complexity is different. Consider in-house when you have:

  • Inventory or manufacturing costing, where the entries depend on operational facts nobody outside the company can see.
  • Payroll with real structure — multiple sites, shift patterns, variable allowances.
  • A parent company that asks questions on short notice and expects answers the same week.
  • Frequent, judgement-heavy transactions — related-party arrangements, project accounting, revenue recognition that is genuinely arguable.

Stay outsourced when your month is mostly rhythm: sales invoices, purchase invoices, payroll, bank, file, close.

What outsourcing does not move

One thing worth being clear about, because it is often glossed over in the sale: outsourcing moves the labour, not the accountability. The company's legal representative remains responsible for the accounting obligation regardless of who performs the work.

That has a practical consequence. You need enough visibility to know whether the work is being done properly — not because your provider is untrustworthy, but because you are the one who answers for it. "We assumed they were handling it" is not a position you want to occupy during a tax inspection.

Questions to ask before you sign

Most engagement conversations cover fees and little else. These five questions matter more:

  1. Are you taking the chief accountant role, or only doing the bookkeeping? These are different engagements at different prices. Get it in writing.
  2. Where does the ledger live, and do we have our own login? If the books exist only inside the provider's system with no access for you, switching providers later means reconstructing a year.
  3. Do you reconcile our books against the tax authority's invoice records every period? This is the single best indicator of quality. A provider who only reconciles at year end is deferring problems into your audit.
  4. What do we receive each month? The right answer includes the filed return with its acknowledgement, a trial balance, and the reconciliation above.
  5. What happens if we leave? Ask for the exit process specifically: complete data export, in what format, within how long.

The third option most companies miss

The framing "outsource or hire" assumes the work is fixed and the only question is who performs it. For most companies in Vietnam that assumption is out of date, because the largest single block of the work — getting supplier invoices off the tax portal and into the ledger — no longer needs a person at all.

That changes the arithmetic in both directions:

  • If you outsource, a provider whose system pulls invoices automatically spends its hours on your close and your questions rather than on data entry. You are buying judgement instead of typing.
  • If you hire, one accountant with good automation covers a company that would otherwise need two — and spends the recovered time on the things that actually require an accountant.

The failure mode is choosing either option while leaving the mechanical work manual. Then you are paying professional rates for retrieval and keystrokes, whichever side of the payroll they sit on.

Where Vietbooks fits

Vietbooks is built for both sides of this decision:

  • For companies keeping it in-house, invoices arrive from the tax authority automatically every night, bank statements are read into proposed journal entries, and the statutory books stay in Vietnamese and VND under Circular 99/2025 or Circular 133 — so one person can run a company that would otherwise need two.
  • For accounting firms, the same system handles many client tax codes with per-client permissions and bulk operations, which is why a good number of Vietnamese accounting service firms use it as their production system.

If you are choosing a provider, it is a fair question to ask which system they work in and whether you get visibility into it.

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This article is general guidance, not legal or tax advice, and reflects the position as at August 2026. The chief accountant requirement derives from the Accounting Law 88/2015/QH13; accounting regimes referred to are Circulars 99/2025/TT-BTC and 133/2016/TT-BTC. Engagement terms and professional requirements vary; confirm your own position with a licensed adviser before acting.