The Cash Reserve a Service Business Should Protect

Why this matters

Most shops that fail are not unprofitable. They run out of cash at the wrong moment, a truck dies, a big customer pays late, a slow stretch runs long, and a profitable business with no reserve borrows at bad rates or folds. A reserve is the difference between a bad week and a crisis. But a reserve only works if it is structured right and protected from yourself, because its worst enemy is the owner who raids it for something that felt urgent in a good month. This is how to build one you will not spend by accident.

A reserve is not one bucket

"Cash in the account" is not a reserve. Money doing four different jobs gets mistaken for one pile and spent. Separate them:

• Operating float - the everyday working cash that covers the normal gap between paying for work and getting paid. This moves constantly; it is not your reserve.
• The true operating reserve - untouchable money whose only job is to carry fixed costs through a shock or a trough. This is the reserve you protect.
• The tax reserve - money you have collected or earned but owe to the government. It was never yours. Spending it is borrowing from an agency that always collects.
• Sinking funds - money set aside on purpose for a known future cost, a truck replacement or an insurance renewal. Named and spoken for, so it does not masquerade as spare cash.

Mixing these is how a reserve vanishes. Keep them in separate accounts.

A line of credit is not a reserve

This is the trap that sinks confident operators. A line of credit is a revolving loan you can draw on and repay as needed, standby borrowing rather than owned cash.

• An available line is useful, but it is someone else's money, it can be cut or frozen exactly when conditions turn bad, and drawing on it starts interest.
• Owned cash cannot be revoked. A reserve you hold survives a credit crunch; a line you were counting on can disappear in one.
• Use a line as a second backstop behind the reserve, never as the reserve itself. See related: Reading Your Own Numbers the Way a Lender Will.

How big, in one line

Sizing is covered in full in the seasonal reserve article; the short version is enough months of fixed operating costs to carry your deepest realistic trough plus a shock, with seasonal trades holding toward the higher end because their swing is sharper. See related: Seasonal Cash Reserve, How Much to Set Aside.

The rules that protect it

A reserve is a discipline, not just an account. Write the rules down and hold them:

• Name what counts as a real reason to touch it. A genuine revenue shock, an emergency, a documented trough. Not a slow-but-normal week, not an opportunity, not an owner draw.
• Refill it on a schedule. A reserve you raid and never rebuild is a one-time loan from yourself. Skim a set share of busy-season revenue back until it is whole.
• Keep it separate and slightly inconvenient. A reserve in the operating account is a reserve you will spend. A separate account, one transfer away but not on the debit card, survives good months.
• Review the target as you grow. Bigger payroll and overhead need a bigger reserve. A cushion sized for last year's shop is thin for this year's.

What raids a reserve

Know the leaks so you can plug them:

• Under-pricing. A shop that does not clear its costs funds the gap from the reserve until it is gone. Fix the price, not the reserve.
• Owner draws in lean months. Taking pay the business did not earn drains the cushion fastest.
• Tax surprises. Skipping the tax reserve means the tax bill hits the operating reserve. Fund tax separately.
• Treating the reserve as the growth fund. Expansion has its own money. The reserve exists to survive, not to spend.

The payoff

A protected reserve keeps you from laying off techs you will need back, from borrowing at bad rates to make payroll, and from taking work below cost just to raise cash in a dead month. It also reads as strength to a lender, because liquidity is one of the first things they check. Protect it and it protects the business.

References

• U.S. Small Business Administration: operating reserves and cash-flow planning.
• Standard practice on months-of-expense coverage and liquidity.
• See related: Seasonal Cash Reserve, How Much to Set Aside; Pay Down Debt Early or Keep the Cash Cushion Decision Tree; Reading Your Own Numbers the Way a Lender Will.