Selling capital at a loss yet still being taxed is a real fear — but it is true only for certain seller categories. For resident individuals and organisations taxed on transfer income, a genuine loss means there is no income to tax. For non-resident individuals and securities transactions taxed on the sale price, a loss is still taxed as usual. This article separates each seller category, then turns to the more important part of a loss deal: how to make the tax authority believe the loss.
1. The answer by seller category
Resident individuals transferring capital (capital contributions, unlisted shares): PIT at 20% applies to taxable income under the Law on Personal Income Tax 109/2025/QH15; a loss sale yields non-positive taxable income → no tax is due on that transaction. Domestic and foreign organisations transferring capital: CIT at 20% on transfer income under the Law on Corporate Income Tax 67/2025/QH15; a loss transfer generates no transfer income → no separate CIT on that loss deal (for domestic organisations, the deal’s result is reflected in the overall results of the tax period). Non-resident individuals: exactly the opposite — tax at 0.1% of the total transfer price regardless of gain or loss, so a loss sale is still taxed. Individuals’ securities transfers (0.1% of the sale price per transaction under the securities mechanism) likewise: a loss sale is still taxed. So the title’s answer is “it depends on who you are and what you sell” — and determining one’s correct category must happen before signing, because it directly affects the deal’s expected net proceeds.
2. A loss sale must still be declared — the filing duty is independent of the payment duty
Owing no tax does not mean doing nothing. Current tax administration (Law on Tax Administration 108/2025/QH15) separates two duties: the declaration duty arises from the transaction, while the payment duty arises only where there is tax payable. A seller in an income-based category (resident individual, organisation) selling at a loss must still file the capital transfer return for that transaction, recording the transfer price, the cost basis and the loss result — directly if self-declaring, or through the buyer/withholding organisation in a withholding structure. That loss-sale return has three practical values beyond formality: it locks the transaction’s timing and facts into the tax system before any dispute arises; it is the file link for the buyer to establish their own cost basis; and it is a condition for the company and the bank to complete the member/shareholder change and the transaction’s cash flow smoothly. An undeclared loss transaction, when discovered in a later reconciliation cycle, is handled simultaneously on the declaration side (late/non-filing penalties) and opened up for price redetermination — losing both layers of protection at once.
3. Must the loss price be a market price: the authority’s redetermination power
The biggest risk of a loss deal lies not in the return but in the price. The tax authority does not accept every contract loss price at face value: under tax administration rules and related-party transaction principles, where the transfer price is unreasonably below the stake’s market value at the sale date — especially where buyer and seller are related parties, or the price is far below the stake’s corresponding net asset value with no economic reason — the authority may redetermine the transfer price at market value, and the redetermined difference becomes taxable income back-assessed with late payment interest and penalties as prescribed. For a loss to be believed, the seller’s price explanation file needs: the enterprise’s financial statements at the sale date (showing accumulated losses, reduced net assets — the very economic reason for the low price); an independent valuation of the stake at the transaction date for sizeable deals; evidence of a genuine offer/negotiation process (expressions of interest, offer letters, if any); and consistency between the contract price and the stake’s book value. In short: a loss because the enterprise genuinely lost value is an accepted loss; a loss existing only on the contract to shift value to the buyer is a deal that gets redetermined — the authority distinguishes the two by the file, not by verbal explanations.
4. Can the loss offset other income or be carried forward?
For resident individuals: capital transfer income is a separate income source in the PIT system — a capital transfer loss cannot offset salary, business or other-source income, and there is no loss carry-forward mechanism to later periods/transactions as with corporate CIT. An individual selling one stake at a loss and another at a gain in the same year likewise cannot net the two results in each transaction’s return; each transfer is taxed independently on its own income. For domestic organisations: the capital transfer result (including a loss) is a component of the enterprise’s overall taxable income in the CIT period — in that sense a transfer loss is reflected in the aggregate business result and falls under CIT’s general loss carry-forward mechanism if the enterprise is loss-making overall. For foreign organisations selling capital under the per-transaction declaration regime in Vietnam: a loss deal creates no “tax asset” usable for a later Vietnamese transaction. The planning consequence: individuals holding several stakes should think in advance about the order and timing of selling each — with no offset mechanism, a year of all gains and a year of all losses yields materially higher total tax than the seller’s “gains minus losses” expectation; while domestic organisations should weigh the timing of recording a loss deal within the overall result picture of the tax period.
If I sell capital at a loss, do I have to pay income tax?
It depends on the seller category. Resident individuals and organisations are taxed on transfer income (20% PIT under Law 109/2025 or 20% CIT under Law 67/2025): a loss sale generates no income, so no tax is due on that transaction. But non-resident individuals (0.1% of the total transfer price) and individuals’ securities transfers (0.1% of the sale price) must still pay even on a loss sale, because those two mechanisms are computed on the price, not on income.
For a loss sale, must I prove the sale price is a market price?
Substantively yes, if the loss is to withstand reconciliation. The seller needs a price explanation file: the enterprise’s financial statements at the sale date showing accumulated losses/reduced net assets as the economic basis for the low price, an independent stake valuation for large deals, evidence of genuine negotiation/offering, and consistency with book value. A loss because the enterprise genuinely lost value is accepted; an unreasonably low price with no economic reason invites suspicion and examination.
Can the tax authority reassess the price when it sees me selling at a loss?
Yes, in cases tax administration law permits: under the Law on Tax Administration 108/2025/QH15 and arm’s length/related-party principles, where the contract transfer price is unreasonably below the stake’s market value — especially between related parties — the authority may redetermine the transfer price, and the redetermined difference becomes taxable income back-assessed with late payment interest and penalties as prescribed.
Can a capital sale loss be offset against other income?
For resident individuals: no — a capital transfer loss cannot offset salary, business or other-source income, and cannot be carried forward; each transfer is taxed independently. For domestic organisations: the capital transfer result is part of the CIT period’s overall taxable income, so the loss is reflected in the aggregate result and falls under CIT’s general loss carry-forward if the enterprise is loss-making overall. A foreign organisation declaring per transaction in Vietnam gains no offset right from a loss deal.