How should I plan for an earn-out or deferred business-sale payment?

Label the payment correctly

A fixed deferred payment has a known amount but arrives later. A contingent payment depends on an event. An earn-out commonly links the final amount to future business results. A retention or escrow arrangement may hold back money against agreed risks. These descriptions overlap, so the actual contract matters more than the label used in conversation.

HMRC distinguishes ascertainable amounts from unascertainable consideration. An amount can be ascertainable even when payment is conditional. Conversely, a cap on a performance-based payment does not automatically make the whole cap ascertainable. These are technical distinctions with practical consequences for cash planning.

Reference: HMRC: What is ascertainable consideration?

Reference: HMRC: Ascertainable but contingent payments

Reference: HMRC: Unascertainable deferred payments

Ask when tax arises

HMRC's guidance says that ascertainable future consideration is generally included in the original disposal proceeds. This can create a need to fund tax before all the cash is collected. Where the amount is unascertainable, the right to receive future consideration can itself be an asset requiring valuation and later tax calculations.

Payments involving shares or securities, and amounts linked to continued employment, need additional analysis. Do not assume that an earn-out is always taxed as capital, always qualifies for Business Asset Disposal Relief or simply becomes taxable on its payment date. Ask for a written explanation addressing your agreement.

Reference: HMRC: Deferred consideration introduction

Reference: HMRC: Unascertainable deferred payments

Reference: HMRC: Deferred consideration involving shares and securities

Plan around the downside as well as the target

Build a household plan using completion proceeds after obligations. Then add separate scenarios for some, all or none of the variable consideration arriving. This helps identify commitments that depend on business performance you may no longer fully control.

For example, an owner with £1.8 million available after completion obligations and a possible £1.2 million earn-out has a £1.8 million immediate planning base. A proposed £1 million family gift would leave £800,000 from that base, regardless of the maximum advertised deal value. This is an illustrative cash example, not a recommendation about gifts or a forecast of the earn-out.

Turn the contract into a monitoring checklist

Ask your solicitor to explain the performance definition, accounting policy, information rights, dispute process and what happens if you leave employment or the buyer changes the business. Ask how payment is secured and what recourse exists if it is not made. A promise to pay is not the same as collected cash.

Keep the monitoring work proportionate but explicit. Allocate an owner for each reporting date, track evidence and revisit the tax estimate when facts change. If a payment is reduced or never received, the available tax treatment depends on the original structure; do not assume an automatic refund of the original tax.

• List each payment's amount, formula, cap, due date and payer.
• Record performance, employment and other conditions.
• Match expected receipts to the tax-and-cash timeline.
• Test personal commitments without the maximum earn-out.
• Schedule contract monitoring and advice if payments change.