Bookkeeping for Personal Trainers
Written and reviewed by the Personal Trainer Accountants editorial team. Last reviewed 8 August 2026.
Bookkeeping is the part trainers put off and the part that decides how much the return costs and how defensible it is. It is also what Making Tax Digital now requires.
The aim is a set of records where every figure traces back to a document, kept as you go rather than assembled at year end.
What Bookkeeping Includes
Income recorded as it comes in from every channel, receipts captured against the right categories, the business share of mixed costs like your phone worked out consistently, and a mileage log that was kept during the year rather than estimated after it.
Where you are inside Making Tax Digital, it also means the quarterly updates. That started on 6 April 2026 for qualifying income over £50,000, with £30,000 following in April 2027 and £20,000 in April 2028, so most working trainers are brought in within two years.
Where Records Break Down
Mixing business and personal money in one account is the usual cause. It makes every figure a matter of memory and it is the first thing that makes a claim look reconstructed.
The second is mileage. At 55p for the first 10,000 business miles it is often the largest single deduction a trainer has, and it is the one that cannot be honestly rebuilt from nothing in January. A log kept in the moment is worth more than any amount of tidying up later.
The third is cash. Bootcamp fees and one-off sessions paid in cash are ordinary income and they need recording like everything else.
How We Set It Up
A separate account for business money, software appropriate to whether you are inside Making Tax Digital yet, receipt capture from your phone, and a mileage habit that takes seconds per journey.
Then we keep it through the year rather than seeing it once. The point is that the return becomes a formality and the numbers hold up if anyone asks.
Fees for Bookkeeping
Quoted as a fixed monthly fee alongside the return, agreed in writing before starting, and based on volume rather than on turnover.
If you are well under the Making Tax Digital thresholds and organised, you may not need this at all, and we will tell you so rather than sell it to you.