Custom ratios and KPIs
Gross profit margins, net profit margins, productivity, number of customers retained, new business won, the list goes on. Without this information you have no control.
Tax is a cash cost to your business. Don't wait to the end of the year to find out what your bill is - plan ahead to ensure you understand how much working capital you actually have. PAYE, VAT and corporation tax have payment deadlines - factor this into your cash flow.
The whole point of being in business is to make profits. Keep an eye on this at all times and constantly compare with your competitors.