Finances
Two or three years of clean accounts where the numbers stack up, and ledgers that can be presented and defended. Deferred income, prepayments and accrual treatment all have to tie back and be explicable — a buyer’s team will test them, and the answers need to be ready before they ask.
Earnings also need normalising before diligence does it for you. That is a judgement exercise as much as a bookkeeping one, and where it lands materially affects the price.
The bookkeeping work is where most of this is built. Doing it years ahead is considerably easier than doing it under deal pressure.