The question “Big4 or a local audit firm” is usually answered by habit rather than criteria: the parent uses a Big4 firm, so the subsidiary does too. Yet audit fees differ several-fold between the two groups, while Vietnamese law sets only one common floor — the audit enterprise must be eligible to practise. This article breaks the decision into verifiable criteria so investors choose the right partner for their enterprise’s stage.
The common legal floor: practice eligibility and approved lists
Every audit enterprise serving mandatory audits in Vietnam must hold a Certificate of eligibility to provide audit services under the Law on Independent Audit 67/2011/QH13, with practising auditors registered with the Ministry of Finance; the list of eligible audit enterprises is published for enterprises to check before contracting. For public-interest entities (especially listed/securities-issuing organisations), securities law adds a layer: the audit must be performed by an audit organisation on the list approved by the State Securities Commission. An unlisted FDI enterprise is not subject to that additional layer — which is precisely the space to consider local firms. Conversely, if an IPO/listing is on the roadmap within a few years, choosing a firm already on the approved list avoids changing auditors mid-course.
When is a Big4 firm the grounded choice?
- The parent or group auditor requires it: many global groups have policies of using the same audit network, or require component auditors to group standards (group instructions, component materiality). A Big4 firm — or a firm in the same international network as the group auditor — is then close to a technical condition, not a branding choice.
- Complex two-layer VAS — IFRS reporting: consolidation packages, multi-layer related-party transactions, derivatives, multi-stream revenue — the Big4’s depth and large teams deliver real value.
- Upcoming capital transactions: fundraising or M&A with international investors — Big4 audit reports are usually accepted faster in due diligence, shortening the process.
- Requirements of foreign banks/lenders in credit agreements designating an accepted auditor group.
When is a local audit firm reasonable?
For a mid-size or small FDI enterprise with uncomplicated transactions and no group or lender constraints, an eligible local audit enterprise — especially firms in mid-tier international networks — fully satisfies the statutory audit requirement. This group’s practical advantages: significantly lower fees (often a fraction of Big4 at the same scope — specifics depend on negotiation and scale), stable teams with less junior staff rotation, the signing partner working directly and deeply with the chief accountant, and greater scheduling flexibility in audit season. What to verify when choosing a local firm: a valid eligibility certificate; the number of practising auditors and similar-sector experience; language support (English/investor’s language) in communications; and working-file quality — because the tax authority does not distinguish “big or small firm” when assessing statement reliability, but a shallow audit leaves back-assessment risk with the enterprise itself.
A practical decision frame
- List the hard constraints first: group policy, credit terms, listing roadmap — constraints narrow the field immediately.
- Request quotations on an identical scope (VAS audit; IFRS package included or not; tax compliance review support included or not) for a like-for-like comparison — price gaps usually narrow once scope is written clearly.
- Interview the team that will actually do the work (partner/manager), not just the business development staff; ask about sector experience and the signing auditor rotation schedule.
- Write into the engagement: the issuance timetable, the number of draft review rounds, the duty to provide a management letter, and support in explaining to the tax authority if the statements are questioned.
- Reassess after each audit season: changing audit firms is the enterprise’s right, and periodically re-tendering keeps fees at market level.
Frequently asked questions
Should an FDI enterprise choose a Big4 or a local audit firm?
It depends on actual constraints: a group requirement for the same audit network, complex IFRS reporting, international capital transactions or designated-lender terms make Big4 the grounded choice. Without those constraints, an eligible local audit enterprise is a fully valid option — the legal effect of the audit report is the same.
How do Big4 and local audits differ for FDI companies?
The main differences: global network and group/IFRS reporting package capability (Big4 stronger); fees (Big4 usually several times higher); team depth for complex transactions; and direct staffing flexibility/stability (local and mid-tier firms are often more flexible). Both groups must hold a Ministry of Finance certificate of eligibility to provide audit services.
Does a local audit meet the parent company’s requirements?
Only if the parent/group auditor accepts it: many groups require the component auditor to be in the same network or meet group instruction standards. The enterprise should obtain written confirmation from group finance before signing with a local firm; if the group only needs validly audited Vietnamese statements and a separate reporting package, an eligible local firm satisfies that.
How large is the fee difference between Big4 and local firms?
There is no regulated tariff; in market practice, at the same scope Big4 fees are usually several times higher than local firms’, especially when an IFRS/group package is included. Request quotations from both groups on one clearly written scope to get real figures for your case.
This article has been quality-reviewed by the FLAW AI Legal Council