Whether the QDMTT top-up is right or wrong is decided by the quality of the effective tax rate computation — a computation that matches no return the company currently files. An internal ETR audit before filing season is how FDI groups catch missed adjustments early. This article sets out the verification layers of a proper ETR review.
Legal Basis
- Decree 236/2025/ND-CP: the ETR is computed jurisdictionally from adjusted covered taxes and net GloBE income of all Vietnamese constituent entities.
- GloBE income adjustment layer: starting from accounting profit under the parent standards, excluding intra-group dividends and adjusting foreign exchange and other items under GloBE rules before forming the ETR denominator.
- Covered taxes layer: current CIT plus deferred taxes recast at the 15% cap, excluding non-covered taxes such as VAT and output-based natural resource taxes by their nature.
- Safe harbour data layer: the country-by-country report must be consistent with the data used for the transitional safe harbour; a defective CbCR forfeits the safe harbour for that year.
Analysis in Practice
An ETR audit starts at the denominator. The reviewer rebuilds the bridge from each constituent entity accounting profit to GloBE income: adding back losses, removing dividends from group subsidiaries, and treating revaluation and intra-group share transaction results. The most common error is lifting domestic taxable profit straight into the denominator — the two figures differ in nature because taxable profit has already passed CIT Law adjustments such as interest caps and loss carry-forwards.
The second layer is the numerator — covered taxes. Beyond CIT paid, every border and withholding tax must be classified by whether it is in substance a tax on income, and deferred taxes must be recast: deferred tax assets and liabilities recorded at domestic rates above 15% are capped at 15% under GloBE rules. This is the part demanding tight coordination with group accounting, because deferred tax data lives at consolidation level.
The third layer verifies safe harbours and data consistency. If the group relies on the transitional CbCR safe harbour to conclude a zero top-up, the audit must confirm the CbCR qualifies: data drawn from qualified financial statements, no material post-closing adjustments, and the Vietnam revenue and profit thresholds as declared. A non-qualifying CbCR collapses the entire safe harbour conclusion and forces a detailed ETR computation on a short clock.
Recommended Actions
- Build the accounting-profit-to-GloBE-income bridge per constituent entity, with an audit trail for every adjustment.
- Classify every tax paid in the year as covered or non-covered, and recast deferred taxes at the 15% cap.
- Verify the year CbCR safe harbour conditions: data sources, consistency with financial statements, de minimis thresholds.
- Reconcile the trial ETR with the figure reported by the group, resolving every gap before the QDMTT filing window.
Frequently Asked Questions
How does the GloBE ETR differ from the effective rate in audited statements?
In both components: GloBE income passes through the global minimum framework own adjustments, and covered taxes include deferred tax recast at 15%. The accounting effective rate is a good starting reference, not the number used for the QDMTT filing.
Who should run the ETR audit — internal tax or outside advisers?
Source data must be prepared internally because it lives in the Vietnamese company accounting and tax files; the GloBE methodology and deferred tax recast usually need advisers experienced in the global minimum model. This two-layer setup keeps data in place while ensuring the computation matches group standards.
Should the ETR audit happen before or after the QDMTT filing?
Before, and early enough to fix data: the QDMTT file has its own post-year-end deadlines, but correcting errors after filing means supplementary declarations and possible late-payment exposure. A sensible cycle is a trial computation right after the annual financial statements are ready.
How does a CbCR defect affect a zero top-up conclusion?
The transitional safe harbour is available only when the CbCR qualifies on data sources and consistency. A CbCR built on unaudited management figures or with undisclosed material adjustments can see the safe harbour denied, forcing a detailed ETR computation for that year.
This article has been quality-reviewed by the FLAW AI Legal Council