The Short Answer

How Much Cash Reserve Should a Business Have?

Textbook Definition

A cash reserve is liquid funds set aside to cover a business's operating expenses during periods of reduced revenue or unexpected costs, commonly sized as a number of months of essential operating expenses.

In Plain English

A common target is three months of what it costs to keep the doors open: wages, rent, loan payments, and utilities. Not growth spending. Just survival. Keep it in its own account and build it a little every week.

Why It Matters

Why Do Good Businesses Run Out of Cash in One Bad Month?

It usually happens to businesses that are doing well. The money finally comes in, and the owner, who has waited years for there to be money, spends it on the business. New equipment. A better sign. The next good idea. It feels responsible, and most of the time it is.

The trouble is that a business that spends every dollar is one bad month from being unable to pay its people. Not a bad year. A month. Thin working capital, meaning little cash on hand against the bills due soon, means one surprise can stop you.

Signs you have this problem:

  • You hit your monthly targets and still have almost nothing in the bank.
  • You could not cover one month of payroll if sales stopped tomorrow.
  • Every good month's extra goes straight into the next idea.
  • A single repair or slow week sends you scrambling.
  • You keep "savings" in the same account you spend from.
  • You have paid deposits on things you do not need yet.
The reserve you build in good months is the business you keep in bad ones. Start it this week, even if the first deposit is small.

What It Looks Like

What It Looks Like When Every Coin Goes to the Next Idea

From the Fabled Forest · Chapter 13

Visionary Veronica finally built her yoga studio, EleWell, with four stone walls and a roof. She hit all three of her targets: sixty-two members, every class three-quarters full, and 120 coins left over every month. And every month, she spent them: new mats, a juice bar deposit, half a mural.

Then the roof leaked over the third row. Drop-ins stopped coming. Seven members paused. Bella quoted ninety coins to fix it, and there were none. Mrs. Owl-Willow did the sum: three hundred coins a month to keep the doors open, fifteen in the till. If nobody came to class for a month, EleWell could last about two days.

They got the juice bar deposit back, moved the mural to spring, and patched the roof with good old slate for fifty. Twenty-five coins went into a new reserve account. Flora chalked a fourth box on the wall: RESERVE: 900.

Veronica's story is Chapter 13 of Accounting and Finance for Small Businesses, Book 2 of Dr. Paul's Fabled Forest Business School Series.

The Fix

How to Build a Cash Reserve in 5 Steps

Small is fine. Steady is what matters. You do not need the whole target to start.

  1. Add up one month of doors-open costs.

    Wages, rent, loan payments, utilities, insurance. The costs that come whether or not a single customer shows up. Leave out growth spending.

  2. Multiply by three for a starting target.

    Three months is a common target. Seasonal or riskier businesses may want more. Write the target down where you will see it.

  3. Open a separate account and make the first deposit today.

    In the business name, not the spending account and not a jar on the shelf. The first deposit can be small. It makes the account real.

  4. Move a set amount every week, before new spending.

    Pick an amount you can keep up, and move it the same day every week, before you buy anything new. Treat it like a bill.

  5. Decide in advance what counts as an emergency.

    Payroll in a slow month: yes. A roof leak: yes. A new idea: no. Post the target and the balance where you can see them. Out of sight of your ideas, in sight of your eyes.

Dr. Paul's Insight

When a bad month hits before the reserve exists, look first at what you have paid for and not received. Refundable deposits, prepaid orders, and half-finished projects can often be paused or reversed to free cash. Then ask each quote for its cheaper honest option: the repair, not the upgrade. Once the month is survived, start the reserve with whatever is left, even if it is small.

Worked Example: Building Three Months, One Week at a Time Doors-open costs: wages $16,000, loan payments $6,000, rent $2,000, utilities and supplies $6,000 = $30,000 a month. Three-month target: $90,000. The business leaves about $12,000 a month after every bill. Move $2,500 a week to the reserve and keep the rest for growth. $2,500 × 52 weeks = $130,000 a year, so the target is reached in about nine months. Figures are an illustration to show the math, not a projection for your business.

Sample: A Cash Reserve Plan

One page. Post it where the owner and the bookkeeper both see it.

Business: Fitness studioTarget: $90,000
Monthly doors-open cost$30,000: wages, loan payments, rent, utilities, supplies
Target3 months: $90,000
Weekly transfer$2,500 every Friday, before any new spending
Where it livesSeparate savings account in the business name
What counts as an emergencyPayroll or rent in a slow month, urgent repairs, a lost major customer. Not new projects.

Sample for illustration. Size your own target from your own monthly costs.

Watch

Video: How Much Cash Should Your Business Keep?

Video Coming Soon

How Much Cash Reserve Should a Small Business Have?

Dr. Paul sizes a reserve target and sets up a weekly transfer plan on screen.

From the Book

How Long Could You Stay Open?

Chapter 13 · Cash Reserve

One Bad Month: An Elephant's Rainy Day

"So if no one came to class for one month," said Mrs. Owl-Willow, "for any reason, a leak, a storm, a sickness going around the forest, you could keep EleWell open for..."

"Two days," said Flora. "About."

Veronica made a small, scratchy sound and sat down on a yoga block.

How did EleWell survive the bad month, and start a reserve with almost nothing? Find out in Chapter 13. Book 2 of Dr. Paul's Fabled Forest Business School Series.

Get the Book on Amazon →

FAQ

Cash Reserve Questions

How many months of expenses should a business keep in reserve?
A common target is three months of essential operating costs, meaning the wages, rent, loan payments, and utilities it takes to keep the doors open. Seasonal businesses, businesses with a few large customers, or those in volatile industries often aim for more. Any reserve is better than none.
What is working capital?
Working capital is your cash and the money coming in soon, minus the bills you have to pay soon. Positive working capital means you can cover near-term bills. Thin or negative working capital means a single surprise, like a slow week or a big repair, can leave you unable to pay.
Where should I keep a cash reserve?
In a separate account in the business name, apart from the account you spend from. It should be easy to reach in a real emergency but not so easy that it gets used for everyday spending or new ideas. Ask your bank about savings options for business accounts.
How do I build a cash reserve with thin margins?
Start small and stay steady. Move a fixed amount every week, even a modest one, before any new spending. Add windfalls, like a large collected invoice or a refund, directly to the reserve. Trim or delay growth projects until the reserve reaches at least one month of costs.

Keep Going

Related Foundations

The cash reserve connects four foundations. It is the cushion under the forecast and the budget. New to a term on this page? Every one is in the accounting and finance glossary.

Foundation 11 · Cash Flow

Your forecast shows which weeks will lean on the reserve.

Foundation 9 · Tax Planning

The tax reserve and the cash reserve are two separate accounts.

Foundation 20 · Budgeting and Forecasting

Build the reserve into your budget as a line, not a leftover.

Foundation 5 · Balance Sheet

Your reserve shows up as cash on the balance sheet, and lenders notice.
Cash Flow Management for Small Businesses book cover

Go Deeper

Cash Flow Management for Small Businesses

A reserve is only as good as your view of the next few months. Pair it with a 13-week cash flow forecast, then keep the habit with the cash flow crash course.

See the cash flow book →
← Back to the GuideAll 20 Accounting and Finance Foundations

Written by Dr. Paul Borosky, DBA, MBA, business consultant, author, and educator with an MBA focused in finance. Want help sizing a reserve that fits your business? See fractional CFO services.

This page is for general educational purposes only. It is not legal, financial, tax, accounting, or lending advice. Tax rules change by place and by year. Dollar figures are illustrations. The Fabled Forest and its characters are fictional. For decisions about your own business, consult a qualified professional.