The profit-leak checklist: 7 places small UK businesses quietly lose money
Profit rarely disappears all at once. It leaks — a little through a customer priced three years ago, a little through a service nobody's re-costed, a little through scope creep nobody tracks. Here's where we typically find it.
By Ivelina Nikolova
Most small business owners can tell you their revenue. Fewer can tell you which service, or which customer, is actually making them money — because the numbers that would answer that question are sitting in an accounting package nobody has opened for reasons beyond the VAT return. Revenue can be healthy while profit quietly leaks out through seven fairly predictable places.
The seven leaks
- 01
Legacy customers, priced years ago. The customer who's been with you since the start, on a rate you haven't revisited since. Loyalty is worth something — it isn't worth absorbing every cost increase since.
- 02
A loss-leader that stopped being strategic. Something you priced low deliberately, to win the work or the relationship, that's still priced low a year later with no plan to revisit it.
- 03
Scope creep on fixed-price work. The extra hour here, the “just one more thing” there, that never gets re-quoted because it feels too small to mention — until it's a fifth of the job.
- 04
Quoting and admin time that isn't costed in. The hours spent estimating jobs you don't win, or chasing paperwork, rarely show up in what you charge for the jobs you do win.
- 05
Software and subscriptions nobody's cancelled. Small monthly charges for tools that were useful for a project that finished eight months ago.
- 06
Late payment dragging on cashflow. Not a profit leak in the strict accounting sense, but it behaves like one — cash tied up in unpaid invoices is cash you can't use to grow, and it hides how well the business is actually doing.
- 07
Not knowing profit by service or by customer. This is the one that makes the other six invisible. A single P&L tells you the business is profitable overall. It won't tell you that one service line is subsidising another, or that your biggest customer by revenue is your worst by margin.
The business that knows its margin by service, by job, and by customer can fix a leak in a month. The business that only knows its overall P&L finds out a year later, after it's already cost them.
A simple way to check your own
You don't need new software to get a first read on this. Pull your last three months of income and direct costs, and split them by service line if you offer more than one. Look at gross margin per line, not just revenue. Then do the same for your top ten customers by revenue, with estimated time spent next to each one. The two views together — profit by service, profit by customer — usually surface at least one of the seven leaks above within the first pass.
What to do next
This is the finance half of what we look at in a Business Health Check — alongside the visibility side, because the two usually connect. A loss-making service is often also the one whose website page hasn't been touched in years. Fixing one without looking at the other is only ever half the answer.
Want this looked at properly, on your own numbers?
A Business Health Check goes deeper than any checklist can — a combined review of your finances and your visibility, delivered by both of us, with a clear set of priorities at the end.