The planning around a business sale that cannot be done in the weeks before completion, and the signs a client is already closer to a sale than they have told you.

Most owners tell their accountant about a sale when there is a buyer. By then the deal runs on the buyer’s timetable, due diligence is under way, and the things that needed a year or two of lead time can no longer be done.
The work that matters happens earlier, while the position can still be changed, and the person most likely to notice that the window is open is the accountant.
A typical sequence looks like this. An approach arrives in the spring. The client mentions it to their accountant in the summer, by which time heads of terms are agreed. Due diligence runs through the autumn and completion is targeted for the year end.
By the time the accountant hears about it, the relief conditions are what they are, the trading-status question is already on the buyer’s list, and the last realistic window for a meaningful employer pension contribution is closing with the company’s year end. Nothing in that sequence involves anybody behaving badly. It is simply that the client did not know the planning had to start earlier, because nobody had told them.
The correction is not complicated: raise it while the sale is hypothetical. A client three years out has every option. A client three months out has almost none.

Tax dominates the conversation about a sale because it is the part with a number attached. The parts that determine whether the client is happy two years afterwards are usually untouched.
Wording you can use“You have mentioned a couple of times that you would like to be out in a few years. The planning that makes a real difference to what you keep has to happen two or three years before a sale rather than in the run-up to one. Would it be worth spending an hour with somebody who does that work, while there is still time for it to count?”
You are describing a timetable, which is a fact about the rules. You are not advising on the structure of the sale or on what the client should do with the proceeds.
Everything above is a description of timing and of rules, which your firm is fully entitled to explain. The boundary sits at the point where the conversation turns to what the client should do with the proceeds, how they should be invested, what a pension contribution should be, or whether one deal structure is better for them than another.
A useful habit is to keep the discussion in the past and the future tense rather than the imperative. Explaining that carry forward expires is a fact. Telling the client to use it is advice.
The corporate tax work, the accounts and the transaction advice remain yours. What the adviser adds is the personal side: what the proceeds have to deliver, how the pension fits, and what the client does the following Monday morning. Those are the questions clients are least prepared for and most grateful to have been asked early.
No cost to your firm, no FCA authorisation, and a named partnership director who sets it up with you.