Working Capital and the Cash-Conversion Cycle

Part B: Understand the Money

Think about the last time you took on a big job. Before the customer paid you a dollar, you bought materials, paid people, filled the truck with fuel and probably ran an ad or two. You were funding that job out of your own pocket. The only question was for how long.

That stretch, from the day you spend money to the day it comes back, is the whole idea of this lesson. It sounds technical, but it is really one plain question: how much money does it take to keep the business running while it waits to be paid?

Working capital in plain language

Working capital is the money you have available to run day-to-day operations. It is the cash in your account plus the money customers owe you that you expect to collect soon, less the bills you have to pay soon. The bills you owe suppliers for things you have already received are called accounts payable. Your profit and the value of your equipment or your truck do not count here; working capital is the fuel in the tank, the money that can actually be used this week. Treat that as a practical simplification. The formal accounting definition is current assets minus current liabilities, and your accountant will use that version.

A business can look successful and still be short of it. Owners often say “I don’t understand, we’re busy,” and being busy is exactly what uses it up. The more you sell, the more you must spend before you collect. We explored that with a $30,000 project in Your Business Can Be Profitable and Still Run Out of Money.

The cash-conversion cycle: how long you fund the gap

The cash-conversion cycle is the number of days between paying out cash and getting cash back. Three things stretch or shrink it. How long your stock or materials sit before they are used or sold. How long customers take to pay you after you deliver. And how long your suppliers let you wait before you pay them. The first two lengthen the cycle. The third shortens it.

Here is a labelled hypothetical, a painting contractor. Say a job is priced at $12,000. Materials cost $3,000 and are paid for on day one. The crew costs $4,000 over the next two weeks. The job finishes and the invoice goes out on day 15. The customer pays on terms of 30 days, so the money arrives on day 45.

Look at what that means. By day 15, this one job has cost $7,000 in cash, and the business has received nothing. For another 30 days it waits. The job is profitable on paper: $12,000 minus $7,000 is $5,000. But for 45 days from the first purchase, the business has been financing the customer. Take on a second job of the same size in week two, and the business is out of pocket $14,000 before the first payment arrives. Growth just doubled the hole.

An HVAC company shows the same pattern. Say it buys a furnace that sits in the warehouse for 30 days, then installs it for a property manager who takes 20 days to pay, and the supplier gave the company 10 days to pay for the furnace. The cycle is 30 plus 20 minus 10, or 40 days of the owner’s money tied up. Again, the numbers are made up to show the arithmetic, but your own version has real numbers you can find.

Three ways to shrink the gap

You cannot make the gap vanish, but you can shrink it. Get paid sooner: deposits, progress payments and shorter terms all pull cash forward, and we cover them in Deposits, Payment Terms and Collecting Money Faster. Spend later: buy materials closer to when you need them, and ask suppliers what terms they can offer. Hold less: stock that sits unsold is cash sitting on a shelf. Which of the three is easiest for your business today?

Also notice that a cash gap is a timing problem, and a higher price does not fix timing. A business that raises prices to fix a cash gap may improve profit and still be short next month. Different problems need different solutions, and knowing which one you have saves a lot of wasted effort.

Once you can see the gap, you can plan for it. The forecast in Building a 12-Month Cash-Flow Forecast shows how much money you will need, and when.

Before the next lesson

Take your last three jobs or your last three big orders. For each one, write down the date you first spent money on it, the date you sent the invoice, and the date the money actually arrived. Count the days from the first to the last. That is your real cash-conversion cycle, and it is often longer than you have been assuming. Then multiply your typical weekly spending by the number of weeks in the cycle to get a rough sense of how much money the gap holds. In the painting example, about $7,000 per job is tied up for 45 days, and yours will be just as concrete.

About one to two hours if your invoices and bank records are easy to find. It costs nothing; you need only your invoice list and a calendar. Repeat the check every few months, since the gap moves as your customers and suppliers change.