Introduction
Most foreign-invested companies in Vietnam outsource their accounting to an accounting firm. Outsourcing itself is a sound choice, and which to choose between in-house and outsourcing is covered in a separate article, “Vietnam FIE Accounting: In-house vs Outsourcing (Accounting Firm & BPO).”
The problem is leaving everything to the firm. When not only the work but also the checking, the judgment, and the past context all sit with the accounting firm, little of it stays inside your own company. In calm times the gap is hard to see, but the moment a tax inspection, signs of fraud, or a change of firm arrives, your company cannot act.
This article organizes the pitfalls of over-relying on your accounting firm, and the minimum functions to keep in-house while you continue to outsource. It stays within reach of companies that cannot place a dedicated accountant.
1. Where “leaving everything to them” differs from proper outsourcing
Outsourcing is not the problem. What is worth separating is not the amount of work you hand over, but whether your own company understands and checks the numbers.
Proper outsourcing hands the work — bookkeeping and filing — to the accounting firm while your company understands what the numbers mean and keeps the final responsibility. Leaving everything to them hands over not only the work but the checking, the judgment, and the past context, so no understanding of the numbers stays inside your company.
Even between two companies that both “outsource bookkeeping and filing,” this gap grows wide. A company that glances over its monthly numbers and asks about anything unclear, versus one that simply files the documents it receives, ends up with completely different protection when something goes wrong.
2. The main pitfalls of over-reliance
When you leave everything to the accounting firm, risks build up little by little.
- Errors and missed filings are found late. When checking is completed entirely inside the firm and none of your own eyes are on it, processing mistakes stay hidden until the annual audit or a tax inspection.
- You cannot explain things in a tax inspection. In a tax inspection, you may be asked to explain not only the basis for an accounting treatment but also the background of the transactions and related documents. If no one inside knows the past context, checking the records and answering takes time.
- The numbers do not serve management. When the monthly figures merely “arrive” without being read, you notice cash-flow or margin problems late and your response falls behind.
- Dependence deepens and switching becomes hard. When the accounting data and the history of how items were processed sit mostly on the firm’s side, migrating data and confirming the facts takes time when you change firms, making the switch heavier.
- You miss signs of internal fraud or improper spending. Because the firm processes what it receives — invoices and supporting documents — it does not necessarily see the full background of each transaction. With no one inside also checking the numbers, it is easy to miss signs such as duplicate payments, unnatural expenses, or overpayments to a supplier.
None of these appear the moment you start over-relying. They advance quietly and then surface all at once during a tax inspection or a downturn in cash flow.
3. Why over-reliance happens
Leaving everything to the firm usually comes from circumstances, not negligence.
There is no in-house accounting staff, the manager is not comfortable with accounting or Vietnamese, there is a belief that “leaving it to a specialist is safe,” and hands are short in the start-up phase. All of these are natural in the early stage of entry.
The problem is when a state of doing no checking at all becomes fixed. Even if the circumstances do not change, keeping just the minimum involvement described below prevents the risks from piling up.
4. Five functions to keep in-house
To avoid over-reliance, you do not need a thick finance team. Even with few hands, keep the following five things inside your company.
- Name a main contact and a backup. Channel the day-to-day exchanges with the accounting firm through a main contact. But share deadlines, important judgments, and submitted documents with the manager and the backup too, so things can still be checked if that person is absent or leaves. Neither needs to be dedicated; a manager or someone in general affairs can take it on alongside other work.
- Review the monthly numbers yourself. Each month, glance over the main profit-and-loss items, cash and deposits, and receivable and payable balances for anything unnatural. If something is unclear, build the habit of asking the firm “why is this number what it is.”
- Keep your own record of important tax and accounting judgments. Rather than leaving it to the firm, record internally why a treatment was chosen — for example, why something was judged subject to foreign contractor tax (FCT), why a cost was treated as deductible or non-deductible, why revenue or an expense was recognized in a particular month, the pricing and terms of related-party transactions, or points raised by the tax authority in prior years. You do not need to store everything in detail; a short email or memo on the important judgments is enough, and it pays off when a staff member changes or during a tax inspection.
- Manage filing and payment deadlines on your side too. Keep filing and payment deadlines on your own calendar as well, so it is a double check rather than a single dependence on the firm.
- Secure access to your accounting data and accounts. So that you are not stuck when you change firms or a staff member leaves, know where at least the following are kept and keep access to them: the accounting-software data and its backup, the e-tax filing account, the e-invoice system, the administrator details for the digital signature and token, prior-year filings, financial statements and tax computations, and important emails and records of judgments with the firm.
None of these require advanced accounting knowledge. The aim is to keep a thin but continuous involvement — understanding the numbers and preserving the rationale behind them.
5. Define the division of roles with your accounting firm
A sure way to avoid over-reliance is to put in writing what you delegate to the firm and what your own company handles. The table below is a starting point for organizing that split.
| Function | Accounting firm | Your company |
| Bookkeeping and filing | Main handler of the work | Providing documents, deadline management |
| Checking the monthly numbers | Preparation and explanation | Review, detecting anomalies |
| Tax and accounting judgments | Advice and proposals | Approval, recording the rationale |
| Authority handling | Document preparation, attending tax inspections | Explaining the facts, final responsibility |
| Data and account management | Day-to-day operation | Securing ownership and access rights |
Review this division of roles not only when you sign the contract, but also at renewal and whenever the responsible staff change. Even companies already using a firm benefit from re-checking “how much is our own role” at these moments, which keeps you from drifting toward over-reliance without noticing.
Conclusion
Outsourcing is one strong option for building an accounting setup in Vietnam. But “delegating” and “leaving everything” are entirely different. Hand the work to the firm, but do not outsource the function of understanding and judging the numbers — this is what protects your company during a tax inspection, fraud, or a change of firm.
Even with few hands, name a main contact and a backup, review the monthly numbers at a glance, record the rationale for judgments, manage deadlines on your side, and secure access to your data and accounts. Starting with these five is enough. And if you reach the stage of moving beyond outsourcing to bring accounting in-house, see also the separate article, “Your First In-House Accountant in Vietnam: Who to Hire.”
FAQ
Q1. If we have no in-house accounting staff, is over-reliance unavoidable?
It is avoidable even without a dedicated accountant. A manager or someone in general affairs can organize the firm contact into a main contact and a backup, glance over the monthly numbers, and manage filing deadlines on your side. This minimum involvement alone lets you escape the “leave everything to them” state. For numbers you don’t understand, it is enough to ask the firm why.
Q2. We trust our accounting firm. Do we still need internal checks?
Trust and internal control are different things. Even a trustworthy firm makes mistakes as long as people do the work, and in a tax inspection the company ultimately bears the duty to explain. Think of internal checks not as doubting the firm, but as the minimum protection for your own company.
Q3. How far should we check internally?
You do not need to look at every journal entry. First, check that the main monthly profit-and-loss items, cash and deposits, receivables and payables, and unpaid tax balances have no large swings. Alongside that, keep track of the filing and payment deadlines and your own access to the accounting data. As a guide, starting with about thirty minutes a month over the numbers is enough (it varies with company size).
