19/10/2026
The number that catches most self-employed people out is: the cash you have left once the tax bill is paid.
Your bank balance isn't all yours if part of it belongs to HMRC. The owners who never panic in January aren't necessarily earning more. They set tax aside as they go.
Simple habits you can employ:
→ Open a separate account for tax
→ Move a set percentage of every payment into it, the day it lands
→ Ask your accountant what that percentage should be for your income
If you're a contractor on day rates, or invoicing on 30 to 60 day terms, this matters even more. Your work is done long before your cash arrives.
Not sure what your number is? Book a free 30-minute consultation — link in comments.
Know your total.