What Does Tax Due Diligence Actually Check Before an Acquisition?

The people, businesses and events in this lesson are fictional teaching examples. They do not describe the firm's clients or actual engagements. Mr Gu plans to acquire a components company. The seller points to steady orders, healthy profits and tax incentives claimed in earlier years. The price looks attractive. His finance manager, Lin, asks what supported those incentives and whether the records will be handed over. The employee who handled the claims has left, the seller replies, and the files need to be located.

Tax due diligence is a review, within an agreed scope, of a target company's tax affairs and the tax implications of a proposed transaction. In this example, the buyer engages a tax advisory team. The seller and target provide agreed information and access to interviews. The target is the company being acquired. A seller can also appoint its own advisers.

The inputs include the deal proposal, ledgers, returns, contracts and supporting documents. The work involves reconciling figures, asking about the facts, checking applicable rules and identifying issues. The output is usually a report or issues list explaining the evidence, potential effects, missing information and recommended actions. It helps the buyer decide whether and how to proceed; it cannot guarantee that no tax questions will ever arise.

First, establish whether the buyer is acquiring shares or assets

Mr Gu initially describes the proposal as buying the factory. The team asks him to be more precise. Is the buyer purchasing shares from the existing shareholders, or buying equipment, inventory and other assets? Following a share acquisition, the target generally remains the same taxpayer, so its historical affairs still need examination. An asset acquisition requires a separate analysis of the transfer and acquisition of each relevant asset. It should not automatically be described as free from historical risks either.

The team draws a simple transaction diagram: who sells to whom, what changes hands, how payment works and when completion is planned. Share purchases, asset purchases and mergers are different arrangements, even when everyone calls them an acquisition. If the proposed structure changes, the earlier tax analysis must be revisited.

Second, connect the accounts, tax returns and payments

Lin provides annual financial statements, but the team also needs returns, tax payment records and detailed ledgers for the relevant periods. Financial statements describe the company's financial results; returns show how it has applied tax rules. Comparing only the final totals is insufficient. Where tax and accounting rules differ, the team checks the tax adjustments rather than assuming accounting profit is taxable profit.

A useful starting point is to follow significant transactions: when a sale occurred, how it was invoiced and collected, which accounting period it entered and how it was reported for tax. Purchases, employee costs and asset disposals receive attention according to their significance. Differences are separated into errors, timing differences and differences in scope. Original records should not be changed merely to make totals agree.

The business determines the scope. If the target trades frequently with another company controlled by its shareholders, the team also considers pricing evidence and reporting. Common ownership does not itself prove that a price is reasonable, nor does a relationship alone prove a problem. The report should identify the entities, periods and activities reviewed, together with exclusions.

Third, examine incentives and losses before assigning them value

Mr Gu is particularly interested in the incentives. The team does more than read the amounts claimed. Which policy was used? Were the conditions met at the time? What evidence supports them? Could the transaction change eligibility? A claim that went unchallenged in earlier years does not answer those questions. Missing records do not immediately establish an incorrect claim, but they limit what the advisers can conclude.

The target also has tax losses from earlier years. These are losses calculated under tax rules that may, subject to conditions, offset income in later periods. They are not cash waiting to be refunded. Their year of origin, filing history, remaining availability and the transaction's effects require review. The buyer should not treat the face amount of a tax loss as a guaranteed financial benefit.

Lin separates missing items into three categories: not applicable to the business, previously created but not yet located, and not currently evidenced as ever having existed. Each entry identifies the explanation, information owner and next action. Mr Gu can then distinguish a document that may be recovered from an uncertainty that must be considered in negotiations.

Fourth, ask which conditions support any proposed tax deferral

The seller asks whether describing the deal as a reorganisation would allow the tax to be paid later. The team explains that special tax treatment applies to qualifying arrangements and may defer recognition of certain income. It is not an exemption from every tax. Commercial purpose, acquisition proportions, the form of payment and continuing arrangements are among the matters that may require examination.

The version of the rules matters. Circular Cai Shui [2009] No. 59 must be read with subsequent provisions, including Cai Shui [2014] No. 109. STA Announcement No. 13 of 2026 makes further adjustments to certain administrative requirements for mergers and divisions, applying to reorganisations with a reorganisation date after 1 January 2026. That adjustment cannot simply be extended to every share purchase or used to disregard other qualifying conditions.

Fifth, turn findings into actions that work within the transaction

The final report does not merely tell Mr Gu to buy or walk away. It separates established facts, supporting evidence, unresolved questions, possible effects and recommended action. Where an amount can only be estimated, the assumptions and range are explained. Incomplete evidence must not be presented as certainty.

For the incentive, the buyer might request genuine supporting records before completion and discuss contractual allocation of responsibility with the seller and lawyers. Completion, or closing, is the stage at which the agreed share or asset transfer and related steps take place. Commercial protections do not change statutory tax obligations and do not amount to tax authority approval. Their implementation needs coordination with the legal, finance and commercial teams.

There may be a gap between signing and completion. The team should update material developments and outstanding documents as agreed. Each action needs an owner, a due date and a way to confirm completion. A thorough report will have limited value if the records disappear during handover and nobody takes responsibility for the remaining questions.

Take four questions into the next deal meeting

Tax due diligence helps the buyer understand historical tax affairs and transaction effects before making decisions. The useful measure is whether significant issues have evidence, clear limitations and a next action, rather than the thickness of the report.

Mr Gu finishes with four questions: What exactly are we buying? What supports the claimed incentives and tax losses? What remains unconfirmed? Who will resolve it, and when? Clear answers provide a better basis for discussing price and terms. Actual tax treatment still depends on the transaction facts and the rules applicable at the relevant time.