The Agency Cash Reserve: How Much to Keep and Where

An agency can be profitable and one step from disaster at the same time. All it takes is one big client paying a month late and another one disappearing — and suddenly there's nothing to cover payroll. What saves you isn't profit, it's a cash reserve: a stash of money that covers your costs when the income stops coming in. Without it, any hiccup turns into a crisis; with it, into a minor inconvenience.

Let's break down how much to keep in your reserve, where to store it, and how to build it without putting it off until "someday."

Why an agency needs a cash reserve

Agency income is uneven: clients pay on deferred terms, projects wrap up, seasonal dips happen. But salaries, rent, and taxes are the same every month. The reserve closes that gap in timing: it lets you calmly ride out a month without any big payments coming in — without taking on debt or holding back your team. It's direct protection against a cash gap — we cover the gaps themselves in The Agency Cash Gap: How to Avoid It.

How much to keep

A working benchmark is 1–3 months of essential costs. One month is the minimum — it gives you breathing room during a typical payment delay. Three months is the comfort zone that lets you survive even losing a big client and calmly look for a replacement. The exact figure depends on how uneven your income is: the more you rely on a few large clients, the bigger the reserve you need.

What counts as a "month of costs"

It's important to size the reserve against essential costs, not revenue. Essential means what you pay whether or not you have projects: team salaries, rent, taxes, key subscriptions. Add that up for one month — and multiply by 1–3. There's no need to fold in variable project costs that may or may not happen.

Where to keep the reserve

The reserve should be accessible but set apart. Accessible — so you can withdraw it quickly if needed (not a multi-year investment). Set apart — in a separate account rather than your general flow, otherwise it will quietly "dissolve" into everyday spending. And above all — don't confuse it with the owner's personal money: we cover that in Business Money vs. Personal: How a Sole Proprietor Should Separate Them.

How to build it without putting it off until "someday"

The reserve will never appear on its own. The approach that works is to set aside a fixed percentage of profit in the "fat" months until you hit your target level. Say, 20% of profit goes into the reserve every month. In strong months that's a noticeable sum, in weak ones it's smaller, but the habit does the work. To plan this with uneven income, see How to Plan Money When Clients Pay Unevenly.

Example: how the reserve saves you

An agency's essential costs are 250 thousand hryvnia a month. A reserve for 2 months = 500 thousand. The biggest client (40% of income) suddenly puts its project on pause. Without a reserve, within three weeks the agency has nothing to cover payroll and takes out a loan at interest or delays the team. With a reserve, it works calmly for 2 months, finds a replacement client, and closes the gap without any fallout. The difference between a crisis and a minor inconvenience is exactly those 500 thousand, set aside in advance.

Where to start

Add up your essential costs for one month and set a target — at least one month in the reserve. Open a separate account and start setting aside a fixed percentage of profit from your very next strong month. Even a partial reserve beats having none.

In Finmap you can see both your essential costs and your profit by month — so it's easy to calculate the target size of your reserve and watch it grow. Try it free for 7 days.