Building a Cash Buffer
A cash buffer is what lets your business absorb a late payment or a bad debt without lurching into its own crisis.
What you'll learn
- What a cash buffer is and why it matters
- How to think about the right size
- Practical ways to build one
- How a buffer interacts with credit control
6 min read
What it is
A cash buffer is a reserve of readily available funds set aside to cover your essential commitments when income is disrupted. For a business that sells on credit, it is the cushion that absorbs a major customer paying late — or not at all — without forcing you to scramble for finance or miss your own obligations. It converts a potential crisis into a manageable bump.
How big should it be
There is no universal figure; the right buffer depends on your fixed costs, how lumpy your income is, and how concentrated your customers are. A common way to think about it is how many weeks or months of essential outgoings you could meet if receipts dried up. The more variable or concentrated your income, the larger the cushion you should aim to hold.
Building it up
Build a buffer gradually and deliberately:
- set aside a small, fixed share of receipts each month;
- direct one-off windfalls or strong months into the reserve;
- trim non-essential spending while you build it;
- keep the funds separate so they are not casually spent.
Consistency matters more than speed — a steadily growing reserve soon becomes meaningful.
Working with credit control
A buffer is not a substitute for getting paid — it is a backstop. The stronger your credit control, the less often you need to draw on the reserve, and the smaller it can safely be. Chase overdue balances early, keep your ledger tight, and use a referral on stubborn debts so your buffer stays intact for genuine shocks.
A note on advice
This is general information only, not legal, financial, or tax advice. The right reserve depends on your circumstances, so seek advice from your accountant or adviser.
Key takeaways
- A cash buffer absorbs late payments and bad debts without crisis.
- Size it against your fixed costs, income variability, and concentration.
- Build it steadily from a fixed share of receipts and windfalls.
- Strong credit control means you draw on the buffer less often.
Frequently asked questions
How many months of costs should my buffer cover?
There is no fixed rule; the more variable or concentrated your income, the larger the cushion you should aim for. Seek advice for your situation. General information only.
Where should I keep a cash buffer?
Somewhere readily accessible but separate from day-to-day funds, so it is not casually spent. Confirm the approach with your adviser.
Does a buffer replace chasing debts?
No. It is a backstop. Strong credit control means you rely on the buffer far less and can keep it for genuine shocks.
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