Quick answer
A business cash reserve is money set aside to cover surprises and timing gaps without borrowing. Many small businesses aim for several weeks of fixed costs, building it gradually through automatic transfers from every deposit. Keep it in a separate account so it is not spent by accident. A reserve reduces how often and how much you need to borrow, and makes any funding you do need cheaper and less stressful.
Key points
- Aim for several weeks of fixed costs, built gradually.
- Keep it in a separate account.
- Automate small transfers from every deposit.
- A reserve plus a standby facility covers most surprises.
Every business faces surprises: a machine breaks, a big customer pays late, a quiet month arrives without warning, a tax bill is larger than expected. A cash reserve turns those surprises from emergencies into inconveniences. It is one of the simplest and most powerful financial habits a small business can build, and it does not require a windfall to start.
What a cash reserve does
A reserve is money set aside, separate from day-to-day operating cash, to cover gaps and shocks. It lets you pay wages when a customer is late, fix equipment without a scramble, ride out a slow month and take advantage of opportunities such as a supplier discount. It also reduces stress, which matters more than most owners admit, because decisions made calmly are usually better than decisions made under pressure.
How much to hold
There is no universal figure. A useful starting point is to calculate your monthly fixed costs: rent, core wages, insurance, loan repayments, software and other bills that arrive regardless of sales. Then consider:
- How volatile is your income? Seasonal or lumpy businesses need more.
- How concentrated are your customers? Reliance on one or two customers increases risk.
- How quickly could you access funding? A standby line of credit can reduce the reserve you need.
- How big are your irregular costs? Annual renewals and major repairs need covering.
Many small businesses aim for several weeks of fixed costs at first, building towards a few months over time. Start with a target that feels achievable and increase it as the habit sticks.
Keep it separate
A reserve held in your everyday account is not a reserve; it is spending money waiting to happen. Open a separate business account for the reserve. Keep it accessible, so you can move money quickly when needed, but separate enough that you do not dip into it for routine costs.
Build it automatically
The easiest way to build a reserve is to automate it:
- Choose a small percentage of every deposit, even a few percent.
- Set up an automatic weekly transfer to the reserve account.
- Increase the percentage when cash flow allows.
- Add windfalls, such as an unexpected large payment, to the reserve.
Small, regular transfers add up faster than occasional large ones, and automation removes the temptation to skip a week.
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Reserve versus tax account
Your cash reserve is different from the money you set aside for GST, PAYG withholding and super. That money belongs to the ATO and your employees. Keep it in its own tax account. Our guide on setting aside tax from every sale explains how. Mixing the two leads to spending tax money on surprises and then facing a BAS you cannot pay.
Seasonal reserves
Seasonal businesses need a specific kind of reserve: one built during peak months to carry the business through the quiet ones. Calculate the shortfall in your quietest months and aim to set aside that amount during your busiest. Our page on seasonal cash flow covers planning across the year.
When to use the reserve
Use it for genuine surprises and timing gaps: a late payment, an urgent repair, a slow week. Then rebuild it. Do not use it for planned investments that should be funded properly; a new machine or fit-out deserves its own funding matched to its life. See matching the loan term to the purpose.
Reserve plus a line of credit
The most resilient setup combines a modest cash reserve with a standby line of credit. The reserve handles small surprises at no cost. The line of credit handles larger gaps, and you pay mainly when you use it. Together they let you handle most situations calmly. See business line of credit.
Building a reserve while carrying debt
If you are repaying expensive debt, there is a temptation to throw every spare dollar at it. That can leave you with no buffer, so the next surprise creates new debt. A balanced approach is to build a small reserve first, then direct extra cash to paying down the most expensive debt, then continue growing the reserve.
How a reserve helps with lenders
A business with a healthy reserve presents well to lenders. Its statements show a buffer, fewer dishonours and less reliance on short-term credit. When you do need funding, you are more likely to be offered better terms, and you can take time to compare rather than accepting the first offer under pressure.
Common obstacles and how to beat them
“There is never anything left over.” Start with a very small percentage. Even a token amount builds the habit.
“I keep dipping into it.” Make it less convenient: a separate account at a different bank, with no card attached.
“We are growing too fast.” Growth eats cash, which is exactly why a reserve matters. Pair it with working capital funding.
Where the money should sit
Keep the reserve somewhere safe and accessible rather than invested in anything that can fall in value or take time to withdraw. A separate business savings account or offset-style account works well for most small businesses. The goal is not to earn a high return on the reserve; it is to have the money available, in full, on the day you need it.
Reviewing the reserve each year
Your target should grow with the business. Once a year, recalculate your monthly fixed costs and review how often you drew on the reserve and why. If you used it frequently for the same kind of gap, that pattern may need a dedicated solution, such as better payment terms or a line of credit. If you rarely touched it, you may be able to direct more cash towards growth or debt reduction.
An illustrative example
An illustrative plumbing business started moving a small percentage of every customer payment into a separate account. Within eight months, it held about six weeks of fixed costs. When its van needed an urgent gearbox replacement and its main builder client paid late in the same month, it covered both from the reserve, avoided borrowing and rebuilt the reserve over the following quarter.
Build resilience, borrow less
A reserve will not prevent every need for funding, but it makes the funding you do need smaller and less urgent. If you need to bridge a gap while building one, tell us about it. There is no credit check to enquire, your details are not handed out to a raft of lenders, and a real person reads every enquiry. Apply now.
Frequently asked questions
How much cash should a small business keep in reserve?
There is no single answer, but many owners aim for several weeks to a few months of fixed costs, depending on how volatile their income is and how quickly they could access funding.
Where should I keep the reserve?
In a separate business account, ideally one that is easy to access in an emergency but not linked to everyday spending.
Should I build a reserve or pay off debt first?
Often a mix. A small reserve prevents new debt from surprises, while paying down expensive debt reduces costs. Avoid draining every dollar into debt repayment.
Is a line of credit a substitute for a reserve?
It can complement one. A reserve covers small surprises without cost; a line of credit covers larger gaps. Together they are very resilient.
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