How Much Cash Should Your Business Keep in Reserve?

Learn how much cash your business should keep in reserve, why profit isn’t the same as cash and how to build a financial buffer that protects your business during uncertain times.

A healthy bank balance gives a business more than reassurance.

It provides time.

Time to deal with a late-paying customer, replace broken equipment, cover a quieter month or invest in an opportunity without immediately relying on borrowing.

However, many business owners are unsure how much cash they should actually keep in reserve.

Some leave almost everything in the company. Others withdraw most available profits and assume future sales will cover the next round of expenses.

Neither approach is automatically correct.

The right level of cash reserve depends on your overheads, industry, payment terms, tax liabilities and the level of risk within the business.

The short answer

Many businesses aim to keep enough cash to cover between three and six months of essential operating costs.

However, this is only a general starting point.

A business may need a larger reserve if it has:

• Irregular income.
• Long customer payment terms.
• High payroll costs.
• Seasonal trading.
• Significant borrowing.
• A small number of major customers.
• Expensive equipment.
• Planned recruitment or expansion.

A more stable business with recurring income and low fixed costs may be comfortable with a smaller reserve.

The correct figure should be based on your actual financial commitments rather than an arbitrary percentage of turnover.

Regular cashflow analysis can help identify how much financial headroom the business genuinely needs.

What is a business cash reserve?

A cash reserve is money deliberately retained within the business to cover future costs, unexpected events and temporary reductions in income.

It is not the same as everyday working capital.

Your normal operating cash may be used for:

• Supplier payments.
• Payroll.
• Rent.
• Software.
• Insurance.
• Marketing.
• Tax payments.
• Loan repayments.

A reserve is the additional buffer that remains available when trading does not go according to plan.

The objective is to give the company enough time to respond rather than forcing directors to make rushed financial decisions.

Why every business needs a cash buffer

Businesses rarely experience perfectly predictable income and expenditure.

Unexpected events can include:

• A major customer paying late.
• A contract ending.
• Equipment breaking down.
• An employee leaving.
• A large tax liability.
• A supplier increasing prices.
• Legal or professional costs.
• A temporary fall in sales.
• Emergency repairs.
• Economic disruption.

Without a reserve, even a profitable business can quickly become financially vulnerable.

A reserve does not remove business risk, but it gives directors more options when something unexpected happens.

Profit does not guarantee available cash

A company may report a healthy annual profit while holding very little cash.

This can happen because money is tied up in:

• Unpaid invoices.
• Stock.
• Equipment.
• Property.
• Loan repayments.
• Director withdrawals.
• Dividends.
• Tax liabilities.

When deciding how much to retain, directors should review both profitability and cashflow.

A profitable business with weak cash collection may require a larger reserve than a lower-profit business with reliable recurring payments.

This is why the bank balance and the profit shown in the accounts should never be considered in isolation.

Start with your essential monthly costs

A practical way to calculate your reserve is to identify the costs the business must continue paying even if sales fall.

These might include:

• Wages.
• Employer National Insurance.
• Pension contributions.
• Rent.
• Utilities.
• Insurance.
• Software.
• Vehicle finance.
• Loan repayments.
• Essential suppliers.
• Accountancy and legal fees.
• Minimum marketing commitments.

These are your core operating costs.

If essential monthly costs total £25,000, then:

• Three months would equal £75,000.
• Six months would equal £150,000.

This gives you a starting range to consider.

It does not necessarily mean £75,000 or £150,000 is automatically the correct answer. The final target should reflect the risks and commitments of the particular business.

Which costs should be included?

The reserve calculation should focus on costs that cannot be removed quickly.

For example, you may be able to pause:

• Optional advertising.
• Non-essential travel.
• Equipment upgrades.
• Certain subscriptions.
• Discretionary bonuses.

However, you may still need to pay:

• Employees.
• Property costs.
• Finance agreements.
• Insurance.
• Core software.
• Tax liabilities.
• Key suppliers.

Separating essential and discretionary costs creates a more realistic reserve target.

It also helps directors understand how quickly costs could actually be reduced during a downturn.

Three months or six months?

The appropriate period depends on the risk profile of the business.

Three months may be suitable where:

• Income is predictable.
• Customers pay quickly.
• Overheads are low.
• The company has recurring contracts.
• Borrowing is limited.
• The business can reduce costs quickly.
• The customer base is diversified.

Six months or more may be appropriate where:

• Income fluctuates.
• The business is seasonal.
• Customers have long payment terms.
• Payroll is significant.
• A few customers generate most revenue.
• Specialist equipment is expensive.
• The business is planning expansion.
• The market is uncertain.

The decision should reflect how long it would realistically take the business to recover from a disruption.

A company that could replace lost revenue within a few weeks may need less protection than one where replacing a major contract could take six months.

Customer concentration increases risk

A business receiving 50% of its revenue from one customer is more exposed than a business with a large and diversified customer base.

If that major customer leaves or delays payment, the impact can be immediate.

Review:

• What percentage of revenue comes from the largest customer?
• How long do major customers take to pay?
• Could the business replace that revenue quickly?
• Are contracts guaranteed?
• Is the customer financially stable?

Higher concentration risk usually supports keeping a larger cash reserve.

It can also be worth assessing the combined exposure to your largest few customers rather than looking at only the single biggest account.

Payment terms affect the reserve you need

A business that pays suppliers within 14 days but waits 60 days for customers to pay must fund the gap.

The longer the payment cycle, the more working capital the business requires.

Review:

• Average customer payment time.
• Supplier payment terms.
• Monthly payroll dates.
• VAT deadlines.
• Loan repayments.
• Seasonal peaks in expenditure.

Businesses with long payment cycles should not rely only on reported profit when deciding how much cash to retain.

Improving credit control can sometimes reduce the size of the cash buffer required because money reaches the business more quickly.

Seasonal businesses need careful planning

Some companies generate most of their income during a particular part of the year.

Examples include businesses affected by:

• Christmas trading.
• School holidays.
• Tourism.
• Weather.
• Annual contracts.
• Tax deadlines.
• Events.

A seasonal business may appear cash-rich after its busiest period but still need that money to cover several quieter months.

The reserve should be based on the full annual trading cycle rather than the current bank balance.

A twelve-month cashflow forecast is particularly useful for identifying these peaks and troughs.

Do not confuse tax money with reserves

Money held for tax is not a true emergency reserve.

The business may need separate amounts for:

• Corporation Tax.
• VAT.
• PAYE.
• Employer National Insurance.
• Self Assessment where relevant.

For example, a company may have £100,000 in the bank but already owe £40,000 in tax.

Its genuinely available cash position is therefore much lower.

Separate savings accounts for tax and general reserves can improve visibility.

For limited companies, understanding Corporation Tax alongside the company’s cashflow can make it easier to avoid treating future tax payments as surplus cash.

Should directors leave profits in the company?

Retaining profits can strengthen the company and provide funding for future growth.

However, directors should consider:

• Personal income needs.
• Dividend planning.
• Future investments.
• Tax liabilities.
• Pension contributions.
• Business risk.
• Exit plans.
• The company’s trading status.

Leaving money in the company may be sensible, but it should form part of a wider financial plan.

There is little value in maintaining an arbitrary cash balance without understanding what the money is intended to achieve.

The danger of taking too much out

Directors sometimes withdraw most available cash because the company has made a profit.

This can leave the business exposed when:

• VAT becomes due.
• Corporation Tax must be paid.
• Customers pay late.
• Payroll increases.
• Equipment needs replacing.
• Sales fall unexpectedly.

Having distributable profits does not automatically mean the company can safely afford a large dividend.

Cashflow should be reviewed before money is extracted.

The company may legally have profits available for distribution while still needing those funds to meet upcoming commitments.

The danger of keeping too much cash

Holding too little cash creates risk, but retaining excessive amounts without a purpose may also be inefficient.

Large unused balances may:

• Earn very little interest.
• Lose purchasing power through inflation.
• Delay useful investment.
• Create confusion about how much is genuinely available.
• Affect longer-term company planning.
• Increase the value of funds exposed to business risk.

Cash should have a purpose.

Possible purposes include:

• Emergency protection.
• Tax.
• Recruitment.
• Equipment.
• Acquisition.
• Premises.
• Marketing.
• Working capital.
• Dividend planning.

If money has no intended use, the directors should review whether it should be invested, extracted or retained.

That decision should consider the company’s wider financial and tax position rather than focusing only on the current balance.

Should the reserve be held in the current account?

Not necessarily.

Many businesses keep reserves in separate business savings accounts.

This can help:

• Prevent accidental spending.
• Separate tax from operating cash.
• Earn interest.
• Improve financial discipline.
• Make cashflow reporting clearer.

However, access requirements matter.

Emergency reserves should generally remain sufficiently accessible for the purpose they are intended to serve.

Money that cannot be accessed when payroll or another urgent commitment is due provides little short-term protection.

Could the company invest its reserves?

Potentially, but investment introduces risk.

Money required for payroll, tax or short-term commitments should not normally be exposed to significant market volatility.

Before investing company cash, consider:

• When the money will be needed.
• How much loss the company could tolerate.
• Investment risk.
• Liquidity.
• Tax treatment.
• The company’s trading status.
• Professional fees.
• The effect on future business plans.

Short-term operating reserves and genuinely long-term surplus cash should be treated differently.

If significant company funds are being considered for investment, professional tax and investment advice may be appropriate before taking action.

Build the reserve gradually

Many small businesses cannot create a full six-month reserve immediately.

A gradual plan may be more realistic.

For example:

1. Build one month of essential costs.
2. Create a separate tax reserve.
3. Increase the emergency fund to three months.
4. Review whether further protection is needed.
5. Continue contributing regularly from surplus cash.

Consistency is more important than trying to achieve the final target immediately.

For a business starting with no reserve at all, reaching one month of essential costs can already provide significantly more flexibility than relying entirely on future customer payments.

Use a percentage-based savings rule

Some businesses transfer a percentage of incoming cash into separate accounts.

The percentages may cover:

• Tax.
• Emergency reserves.
• Future investment.
• Profit distribution.

The correct percentages depend on margins and tax exposure.

A percentage system can improve discipline, but it should not replace proper cashflow forecasting.

If sales increase significantly while costs increase even faster, blindly saving a fixed percentage may not produce an appropriate reserve.

Forecast before paying dividends

Before declaring dividends, directors should review:

• Current bank balance.
• Tax liabilities.
• Debtors.
• Creditors.
• Payroll.
• Loan repayments.
• Planned expenditure.
• Reserve target.
• Expected sales.
• Seasonal changes.

The company should remain financially secure after the dividend is paid.

This is particularly important where a large dividend would materially reduce the company’s available working capital.

Regular financial reporting makes this assessment much easier than trying to make the decision from the bank balance alone.

Recalculate the reserve as the business grows

A reserve target should not remain fixed indefinitely.

If the business grows from £20,000 to £80,000 of monthly overheads, the old reserve may no longer be adequate.

Review the target when:

• Hiring staff.
• Taking larger premises.
• Increasing borrowing.
• Winning a major customer.
• Losing a contract.
• Purchasing expensive equipment.
• Entering a new market.
• Changing payment terms.
• Expanding internationally.

Growth usually increases both opportunity and financial exposure.

A cash reserve that was appropriate when the business had two employees may be completely inadequate once it has twenty.

What if the business cannot build a reserve?

If the company consistently struggles to retain cash, investigate the cause.

Possible issues include:

• Low profit margins.
• Underpricing.
• Slow customer payments.
• Excessive stock.
• High overheads.
• Too much borrowing.
• Excessive director withdrawals.
• Weak credit control.
• Poor forecasting.
• Unprofitable customers.

The problem may not be a lack of discipline.

It may be that the business model is not generating enough surplus cash.

Accurate bookkeeping and regular management information can help identify where cash is being absorbed before the position becomes critical.

Borrowing is not the same as a reserve

An overdraft or credit facility can support short-term cashflow, but it is not a substitute for retained cash.

Borrowing may:

• Be withdrawn by the lender.
• Carry interest.
• Require security.
• Include covenants.
• Become more expensive.
• Be unavailable during a crisis.

Finance can form part of a contingency plan, but a business should understand the difference between available credit and its own cash reserves.

Having both a sensible reserve and access to suitable finance may give a business more flexibility than relying entirely on one or the other.

A practical example

Assume a company has the following monthly essential costs:

• Payroll and employment costs: £28,000
• Rent and utilities: £6,000
• Finance payments: £3,000
• Essential software and insurance: £2,000
• Minimum supplier commitments: £6,000

Total essential monthly costs are £45,000.

A three-month reserve would be:

£45,000 × 3 = £135,000

A six-month reserve would be:

£45,000 × 6 = £270,000

The directors might decide on a £180,000 target based on customer payment risk and the stability of future sales.

This amount should remain separate from money already committed for VAT, Corporation Tax and other known liabilities.

The example demonstrates why using turnover alone is not particularly helpful. The reserve is being calculated from what the business would actually need to keep operating.

Common mistakes

Using turnover instead of costs

Reserve requirements should normally be linked to commitments, not simply revenue.

A £1 million-turnover company with very low overheads may require a smaller reserve than a lower-turnover company with significant payroll and fixed costs.

Treating VAT as available cash

VAT collected may ultimately need to be paid to HMRC.

Including it in an emergency reserve calculation can overstate the company’s available funds.

Paying large dividends without forecasting

A dividend can weaken the company’s ability to deal with disruption.

Always consider the company’s expected cash position after the payment.

Ignoring seasonal patterns

A strong current balance may be needed to fund quieter months.

Look at the full annual cycle before deciding money is surplus.

Keeping no contingency for customer losses

Replacing a major customer may take several months.

Businesses with concentrated customer bases may need additional financial protection.

Holding money with no purpose

Excess cash should be reviewed as part of wider financial planning.

The objective should be to understand why the company is holding the money.

Never updating the target

The reserve should grow or change as overheads and business risk change.

Questions to ask when setting your reserve

Ask:

• What are the company’s essential monthly costs?
• Which costs could be reduced quickly?
• How predictable is revenue?
• How long do customers take to pay?
• How dependent are we on major customers?
• Is the business seasonal?
• What tax liabilities are due?
• What borrowing commitments exist?
• Are we planning recruitment or investment?
• How quickly could the company replace lost revenue?
• What cash is already restricted for a specific purpose?
• How often should the reserve be reviewed?

Answering these questions usually produces a much more useful target than choosing a round number based on instinct.

Frequently Asked Questions

How much cash should a small business keep?

Many businesses consider three to six months of essential operating costs as a useful starting point, but the correct amount depends on risk, overheads and income stability.

Is money for VAT part of the reserve?

Generally, money already expected to be needed for tax should be treated as committed rather than as an emergency reserve.

Should I leave all profits in my company?

Not necessarily.

The correct balance depends on business needs, personal income requirements, tax considerations and future plans.

Can the company put reserves in a savings account?

Yes, provided the account is suitable for the business and the money remains appropriately accessible for its intended purpose.

Is an overdraft a cash reserve?

No.

It is borrowing and may not always remain available on the same terms.

How often should reserves be reviewed?

At least annually is a useful discipline, but the target should also be reviewed whenever there is a major change in overheads, staffing, borrowing, customer concentration or revenue.

What if I cannot afford three months of costs?

Start with a smaller target and build it gradually while reviewing pricing, margins, cash collection and unnecessary expenditure.

Building some financial headroom is generally better than delaying the process because the ideal target cannot be reached immediately.

Final thoughts

There is no single cash reserve figure that suits every business.

The right amount depends on:

• Essential overheads.
• Income stability.
• Customer payment terms.
• Tax liabilities.
• Seasonality.
• Borrowing.
• Growth plans.
• Business risk.

A reserve should give the company enough time to respond to problems without making rushed decisions.

For many businesses, three to six months of essential expenditure is a useful starting point, but the final figure should be based on a detailed cashflow forecast and the individual risks facing the company.

At Merranti Accounting, we help business owners calculate an appropriate reserve target, identify how much cash is genuinely available and build a financial plan that balances protection, investment and director remuneration.

This article provides general information and should not be treated as personalised accounting, tax, investment or financial advice. The appropriate level and treatment of business cash reserves will depend on the circumstances and objectives of the company.

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Written by Steve Watts ACMA

Steve Watts is Accounting Director at Merranti Accounting and a Chartered Management Accountant.

Steve qualified as a CIMA accountant in 1995 and has more than 20 years of commercial finance and accounting experience.

His background includes housebuilding, serviced accommodation, property investment and development, joint ventures and wider commercial finance. At Merranti, Steve supports business owners with management accounts, Corporation Tax, VAT, payroll, tax returns, financial strategy and business planning.

Steve’s commercial experience gives him a practical understanding of the importance of balancing profitability with working capital and cash reserves. A company can be profitable while remaining financially vulnerable if too much cash is tied up, withdrawn or already committed to future liabilities.

His approach focuses on helping directors understand how much cash the business genuinely has available, what needs to be retained for future commitments and how financial forecasts can support better decisions around investment, dividends and growth.

Read more about Steve Watts and his experience or connect with Steve on LinkedIn.