Vietnam has no standalone “year-end adjustment” mechanism — and that is the root of the trouble
Many multinational groups run a year-end true-up policy: after closing the books, if the Vietnamese distributor’s or manufacturer’s actual margin falls outside the target market range, the parent issues an upward or downward adjustment to bring the result to the point set in the transfer pricing policy. The problem is that Vietnamese law contains no provision designed specifically for this mechanism: related-party transactions in Vietnam follow the arm’s length principle under Decree 255/2026/ND-CP (from 1 July 2026), and any adjustment to a transaction value already incurred must travel through the general institutions — adjustment invoices under invoice law, supplementary tax filings under the Tax Administration Law, and, for imported goods, customs value as well. An adjustment entry living only in the group’s books, with no corresponding Vietnamese documents, will not be recognised on finalisation.
Understand the asymmetry risk before acting: adjustments increasing Vietnam profit and tax (raising sale prices, lowering purchase prices, or a parent compensation receipt booked as income) are generally accepted as to direction, with only the basis examined. Adjustments decreasing Vietnam profit (lowering sale prices, raising amounts payable to the parent) are examined far more closely: the authority will demand transfer pricing documentation proving the post-adjustment result is the arm’s length one, and may still refuse if the benchmarking is not strong enough — because in substance this reduces the tax base after the fiscal year has ended. Design in-year pricing well enough that the year-end adjustment is a small fine-tuning, not a large margin “rescue.”
The document chain for a valid adjustment
A year-end adjustment that stands up in Vietnam needs a closed document chain in sequence. First, a pre-existing policy basis: a price adjustment (true-up) clause in the related-party contract signed at the start of the period, stating the mechanism, the target indicator and when the adjustment is determined — without this clause the adjustment looks like an after-the-fact arrangement. Second, the year’s adjustment determination document: a computation showing the actual result, the market range from that year’s benchmarking, the policy target point and the adjustment amount — the paper connecting policy to the specific figure. Third, the adjustment invoice: if the adjustment attaches to goods or services already invoiced during the year, the seller issues an increasing or decreasing adjustment invoice under invoice rules (stating the adjustment content and linking to the original invoice); if in substance it is a standalone settlement payment under a service contract or pricing policy, the documents must reflect that substance rather than forcing it into a goods invoice form.
Fourth, the accompanying tax handling: file supplementary CIT and related-party information returns for the relevant year if the adjustment changes declared taxable income, done before the tax authority announces an inspection decision under the supplementary filing rules of the Tax Administration Law (currently Law 108/2025/QH15 from 1 July 2026); adjustments touching imported goods require a customs value impact assessment, because an adjusted price may change the cleared import duty value; adjustments paid to or received from abroad travel through international payment channels with contractor tax filings where applicable. Fifth, consistent reflection in the year’s transfer pricing file: the Local File must present the adjustment as part of the applied pricing mechanism, with pre- and post-adjustment results — auditors trace exactly this chain.
Timing, and the errors that get adjustments rejected
On timing, the adjustment should be determined and documented before the annual CIT finalisation deadline for the relevant year if it is to belong naturally to that year; an adjustment arising after finalisation must go through supplementary filing with full explanation, and the further from book closing, the weaker its basis persuades. Once the tax authority has announced an audit or inspection decision for that year, the right to file supplementary returns reducing tax payable is locked under tax administration rules — a hard deadline many enterprises miss by waiting too long for group figures. Operationally, lock the calendar: preliminary figures in December, draft benchmarking in January, the adjustment document and invoices before the finalisation deadline.
The three most common rejection errors: one, no true-up clause in the original contract, appearing only in a year-end document; two, an adjustment invoice worded generically, unlinkable to the transaction and its computation basis; three, one-directional adjustments in the same profit-decreasing direction for many consecutive years while in-year pricing policy never changes — a sign the enterprise is using year-end adjustments in place of a correct pricing policy, giving the authority full grounds to re-determine prices for the whole period. The root fix is better in-year pricing: provisional prices on forecast margins, a mid-year review to intervene early, so the year-end true-up returns to its proper role as a small fine-tune within the market range.
Frequently asked questions
Can transfer prices be adjusted at year-end?
Yes, provided the adjustment mechanism was in the contract from the start of the period, the amount is computed from that year’s benchmarking, and full Vietnamese documentation exists. Vietnam has no separate year-end adjustment regime: every adjustment must run through adjustment invoices, supplementary tax filings and the transfer pricing file like ordinary price changes.
How is the adjustment invoice issued?
Where the adjustment attaches to an already-invoiced transaction, the seller issues an increasing or decreasing adjustment invoice under invoice law, stating the content and linking to the original invoice, with the computation basis attached. A standalone settlement payment under a contract follows documents matching that substance; file supplementary tax returns and assess customs value impact if imports are involved.
Is it treated as profit shifting?
Adjustments increasing Vietnam profit are usually accepted as to direction; profit-decreasing adjustments are tightly examined against the transfer pricing file because they shrink the tax base after year-end. One-directional profit-decreasing adjustments over many years with no change to in-year pricing are a high-risk pattern and can lead to price re-determination for the whole period.
What is the deadline?
Best determined and documented before the annual CIT finalisation deadline of the relevant year. After finalisation it must go through supplementary filing with explanation, and the right to supplementary filings reducing tax locks once the tax authority announces an audit or inspection decision for that year — the hard deadline under the Tax Administration Law.
This article has been quality-reviewed by the FLAW AI Legal Council