How Much Cash Reserve a Small Business Should Hold
- Why a rule of thumb is not enough
- Build it in three layers
- Seasonal businesses need a moving floor
- Does an overdraft limit count?
- Where to keep it
- Decide in advance what happens when you touch it
- Resizing it
- Where this fits
A small business should hold enough cash, or committed and undrawn borrowing, to pay its fixed costs for a set number of months, absorb its largest customer paying late, and meet the statutory payments falling due in the next few weeks. For many owner-run businesses that works out to somewhere between two and four months of fixed costs, but the method matters more than the multiple.
The reserve is a floor, not a target. The bank balance should rarely touch it, and when it does, something specific should happen.
Why a rule of thumb is not enough
“Three months of expenses” treats a business with fifty small customers paying on delivery the same as a business with two large customers paying in 90 days. The second is far more exposed: one delayed payment removes a large share of its monthly inflow at once. The reserve should be sized to the risks the business actually runs.
Build it in three layers
Layer 1: fixed costs for a set period
These are the payments that continue whatever sales do. A small design-and-print business, monthly:
| Fixed cost | ₹ a month |
|---|---|
| Salaries | 3,50,000 |
| Rent | 1,00,000 |
| Term loan EMIs | 80,000 |
| Software, utilities, insurance, other | 70,000 |
| Total | 6,00,000 |
Choose the number of months from how quickly revenue could recover after a shock. A business with steady repeat demand might use one or two. A project business where the pipeline can empty for a quarter might use three. This business chooses two months: ₹12,00,000.
Layer 2: the largest single receivable risk
Its largest customer accounts for about ₹4,00,000 of receipts a month, on 60-day terms, and has paid late before. If that customer slips one payment cycle, ₹4,00,000 that was expected does not arrive. Add ₹4,00,000.
If two customers together account for most of the revenue, add both. Concentration is the main reason similar businesses need very different reserves.
Layer 3: known statutory and lumpy payments
Tax deducted at source, GST, employee provident fund contributions and advance tax instalments fall due on fixed dates and carry interest or penalties if missed. So do annual items such as insurance renewals. Add what falls due in the next month or so. For this business: ₹1,50,000.
The total
| Layer | ₹ |
|---|---|
| Two months of fixed costs | 12,00,000 |
| Largest customer’s delayed cycle | 4,00,000 |
| Statutory and lumpy payments due soon | 1,50,000 |
| Minimum reserve | 17,50,000 |
That is just under three months of fixed costs, arrived at from the business’s own risks rather than a borrowed rule.
Seasonal businesses need a moving floor
A business that earns most of its revenue in a festive quarter, a school admission season or a harvest cycle should not hold the same reserve all year. Before the busy season it has to buy stock and hire temporary staff, while the cash from those sales arrives weeks or months later. The reserve in the months leading into the season should include that build-up, and it can fall back once collections come in. Setting the floor month by month from last year’s cash pattern is more useful than a single annual figure.
Does an overdraft limit count?
Partly. An undrawn overdraft or cash credit limit is real liquidity, but it has two weaknesses. Banks can reduce limits at renewal, and a business in difficulty is exactly the one whose limit is most likely to be cut. And a limit that is already used for day-to-day working capital is not available as a reserve.
A sensible approach is to count only the part of a committed limit that is routinely undrawn, and to hold at least the statutory payments and one month of fixed costs in actual cash regardless.
Where to keep it
The reserve needs to be available within days. A current account, a sweep facility into fixed deposits, or short deposits that can be broken without large penalties all work. Business cash invested for returns in anything that can fall in value is not a reserve.
Keep it distinct from the operating balance, even if only by a sweep threshold, so that it does not quietly become next month’s supplier payments.
Decide in advance what happens when you touch it
A reserve without a rule simply gets spent. Write down the triggers now, while nothing is wrong:
- Balance falls below the reserve: pause discretionary spend and non-urgent hiring, and chase the largest overdue receivables personally.
- Balance falls below half the reserve: talk to the bank about limits before you need them, and review which costs can be deferred.
- Reserve used for more than a month: build a short-term cash forecast and review pricing, credit terms and the cost base.
Resizing it
Recompute the reserve every six months, or sooner if fixed costs rise, a large customer is added or lost, or a new loan starts. A business that has just hired four people and signed a larger lease can have a very different reserve from six months ago with the same revenue.
Where this fits
- How long cash would last today: how many months of runway do I have
- Forecasting the next quarter’s cash: 13-week cash flow forecast
- When a large customer pays late: what to do when a customer is not paying
- Tools: cash flow calculator · working capital calculator