How many months of cash reserve should a small business keep?

Three to six months of essential cash payments is a useful starting target for a small-business reserve. American Bank suggests three to six months; Bank of America recommends three months in its small-business cash-flow guidance. Your target may need to be higher or lower, depending on how long a disruption could last and which payments would still be due.

Start with two questions: how long would it take to restore customer collections, and what would you have to pay while you wait? Cancellation costs, seasonal changes and dependable access to financing also affect the amount you need.

1. Use three to six months as a starting point

A reserve gives you cash to draw on when sales fall, customers pay late or an unexpected cost arrives. The three-to-six-month range helps you set an initial target, but it does not tell you whether that target fits your business.

A solo consultant with low fixed costs may need a different buffer from a business with payroll, inventory and a long sales cycle. A delayed invoice is also different from losing the customer altogether: one postpones cash, while the other may remove it for months.

Choose a target that covers a plausible disruption and the time you would need to respond. Review it when your costs, customer mix or payment terms change.

2. Work out which cash payments would continue

List the payments you would still have to make during a slowdown. Include their due dates and any notice periods or cancellation charges. Some costs can fall quickly; others remain due even when the related revenue stops.

• Core payroll and any minimum owner pay needed to keep the business operating
• Rent or mortgage payments
• Utilities and necessary insurance
• Required loan repayments and other debt payments
• Essential software, supplies and inventory purchases
• Contractor payments and other commitments you cannot cancel

Review spending you could reduce or postpone, such as optional owner distributions, software upgrades or some marketing activity. Do not assume every discretionary cost can be stopped immediately, or that cutting sales activity has no effect on recovery.

3. Separate your reserve from money already committed

The balance in your bank accounts can include money for taxes, supplier invoices and work you have already promised to deliver. Treating all of it as emergency cash overstates what is available.

Identify cash assigned to specific upcoming obligations, then decide how much of the remaining cash is actually designated as your reserve. Keep a consistent distinction between your operating cash, earmarked funds and reserve, whether you use separate accounts or clear allocation records.

Our bank balance vs cash plan guide explains why an account balance alone can be misleading. Tax allocations need particular care: spending that cash leaves a funding shortfall when the tax payment is due. The tax obligation already exists.

4. Calculate your reserve coverage

Divide your designated reserve by the essential monthly cash payments it is intended to cover. For uneven costs, use a weekly forecast alongside this rough monthly measure.

Reserve coverage in months = designated reserve ÷ essential monthly cash payments

Here is an illustrative example:

In this example, the $5,000 covers continuing monthly payments and excludes the taxes and project obligations already funded by the separate $20,000 allocation. Count each payment once in the full cash forecast.

The designated reserve covers two months under these assumptions. The business still has $30,000 of total cash, but $20,000 has another job to do. Reserve coverage is a useful measure; it is not, by itself, a forecast of how long the whole business can survive.

5. Test the timing of a disruption

A monthly average can hide a shortfall before the next customer payment arrives. Build a weekly cash forecast showing opening cash, expected collections, payments due and closing cash. Mark earmarked funds clearly so you can see when a scenario would force you to use them.

Test situations that fit your business:

• Your largest client pays six weeks late. Move the collection date and check whether cash covers payroll and rent in the intervening weeks.
• A project is cancelled after you commit to contractor costs. Remove the expected collections and retain any future payments you cannot cancel.
• A customer representing 20% of revenue leaves. Model the lost collections, costs that fall with the lost work and the time needed to win replacement work.
• A quiet season overlaps with a $3,000 repair. Add the repair when payment would be due, alongside the lower seasonal collections.

For each scenario, note the lowest projected cash balance and the additional cash needed to meet payments while protecting earmarked funds. Try different recovery times and collection dates. The result is an estimate based on those assumptions, so leave room for delays and costs you have not anticipated.

6. Build and replenish the reserve at a workable pace

If your reserve is below target, choose contributions your forecast can support. A transfer into a reserve account moves cash within the business; it is not an operating expense.

• Set a regular contribution. Leave enough cash for taxes, committed payments and necessary operations before transferring money into the reserve.
• Distinguish minimum owner pay from optional distributions. Include the minimum needed to keep working in your cash plan, and check whether the business can support it.
• Add more during stronger periods. Use part of the available surplus after checking upcoming commitments.
• Plan how to replenish it after use. Set a realistic schedule that accounts for overdue obligations and necessary spending.

Keep the reserve accessible and review the target when your business changes. A larger payroll, a more concentrated customer base or longer payment terms may require a different buffer.

Put a number and a date against your target

Start with the three-to-six-month benchmark, then check it against your payment commitments and recovery scenarios. Write down your target amount, the assumptions behind it and when you will review it. That gives you a reserve plan you can act on.

Finsway can help you record payment allocations and plan cash commitments. Use those records alongside a separate weekly forecast to test disruption scenarios.

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