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.
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.
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.
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.
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.
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.
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.
Customer concentration increases risk
A business receiving 50% of its revenue from one customer is more exposed than a business with 100 smaller customers.
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.
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.
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.
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 usable cash position is therefore much lower.
Separate savings accounts for tax and general reserves can improve visibility.
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.
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 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.
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 accessible without significant penalties or delays.
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 long-term surplus cash should be treated differently.
Build the reserve gradually
Many small businesses cannot create a full six-month reserve immediately.
A gradual plan may be more realistic.
For example:
- Build one month of essential costs.
- Create a separate tax reserve.
- Increase the emergency fund to three months.
- Review whether further protection is needed.
- Continue contributing a percentage of monthly profit.
Consistency is more important than trying to achieve the final target immediately.
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.
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.
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.
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.
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.
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 reserved for VAT and Corporation Tax.
Common mistakes
Using turnover instead of costs
Reserve requirements should normally be linked to commitments, not simply revenue.
Treating VAT as available cash
VAT collected may belong to HMRC.
Paying large dividends without forecasting
A dividend can weaken the company’s ability to deal with disruption.
Ignoring seasonal patterns
A strong current balance may be needed to fund quieter months.
Keeping no contingency for customer losses
Replacing a major customer may take several months.
Holding money with no purpose
Excess cash should be reviewed as part of wider financial planning.
Never updating the target
The reserve should grow as overheads and business risk increase.
Questions to ask when setting your reserve
- 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?
Frequently asked questions
How much cash should a small business keep?
Many businesses consider three to six months of essential operating costs, but the correct amount depends on risk, overheads and income stability.
Is money for VAT part of the reserve?
No. Tax money should normally be treated as committed rather than available for emergencies.
Should I leave all profits in my company?
Not necessarily. The correct balance depends on business needs, personal income requirements and future plans.
Can the company put reserves in a savings account?
Yes, provided the money remains appropriately accessible and the account is held in the company’s name.
Is an overdraft a cash reserve?
No. It is borrowing and may not always remain available.
How often should reserves be reviewed?
At least annually, and whenever there is a major change in overheads, staffing, borrowing or revenue.
What if I cannot afford three months of costs?
Start with a smaller target and build it gradually while reviewing pricing, margins and cash collection.
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.
Merranti Accounting can help you calculate an appropriate reserve target, identify how much cash is genuinely available and build a financial plan that balances protection, investment and director remuneration.
Written by Steve Watts
