How much cash should my business keep in reserve?

How much cash you should keep back depends on how predictable revenue is, how quickly customers pay, the fixed monthly cost base and how easily the business could reduce spending or access funding.

Reviewed by Paul Barnes, Founder, Cloud Accounting Support Services · Last reviewed 29 September 2026

There isn't one number that suits every business

How much cash you should keep back depends on how predictable revenue is, how quickly customers pay, the fixed monthly cost base and how easily the business could reduce spending or access funding.

Start with what you have to pay

Look at the cash needed to cover payroll, premises, finance commitments, tax and other unavoidable costs for a period where income was weaker than expected. That gives you a more useful target than a percentage of turnover.

Think about how predictable the business is

Businesses with recurring income and low fixed costs can often operate with a smaller buffer than businesses with seasonal sales, large payrolls, stock commitments or a small number of major customers.

Don't confuse the bank balance with spare cash

Cash sitting in the bank may already be needed for VAT, Corporation Tax, payroll or upcoming supplier payments. A reserve should be money available after known commitments, not simply the current bank balance.

Cash Flow & Forecasting

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