What Is a Cash Flow Gap? Meaning and Example

What a cash flow gap is
The three parts of the cash cycle

A cash flow gap is the time, and the money, between paying for the work you deliver and getting paid for it. You pay suppliers, staff and rent before the client's payment arrives, so for that stretch the business covers the costs from its own cash. A business can make a profit on a job and still be short of cash during the gap. This page explains what creates the gap, how to measure it in days with the cash cycle, and what makes it longer or shorter. For week-by-week steps to manage cash, see how to manage cash flow.

Billed publishes this page.

What a cash flow gap is

Cash comes in and goes out at different times. What is cash flow covers inflows, outflows and the three types of cash flow. A gap appears when the money going out for a job or a period is due before the money coming in from it.

The OpenStax textbooks quoted on this page don't use the phrase "cash flow gap". They measure the same timing with the cash cycle. OpenStax Principles of Finance, section 19.1, defines it:

"The cash cycle, also called the cash conversion cycle, is the time period between when a business begins production and acquires resources from its suppliers (for example, acquisition of materials and other forms of inventory) and when it receives cash from its customers. This is offset by the time it takes to pay suppliers (called the payables deferral period)."

The same section says "The cash cycle is measured in days" and gives the formula as "Cash Cycle = Inventory Conversion Period + Receivables Collection Period - Payables Deferral Period".

The three parts of the cash cycle

Inventory conversion period. OpenStax describes it as "the time (days) it takes to convert inventory to sales". A service business that holds no inventory has nothing to count here, so its cash cycle comes down to the other two parts.
Receivables collection period. The days between a sale and the client's payment. Your payment terms and how soon clients pay set this number. See what is accounts receivable and invoice payment terms explained.
Payables deferral period. In the OpenStax definition, "the time it takes to pay suppliers". Paying later subtracts more days from the cycle.

The longer the cash cycle, the longer your own cash has to cover costs before clients pay.

What makes the gap longer or shorter

OpenStax Principles of Finance, section 19.1:

"Shortening the inventory conversion period and the receivables collection period or lengthening the payables deferral period shortens the cash conversion cycle."

"Ideally, a company’s management should minimize the number of days it takes to convert inventory to cash while maximizing the amount of time it takes to pay suppliers."

So the gap gets longer when:

clients take longer to pay, or you give them longer terms;
inventory or materials sit longer before they're sold or used on a job;
you pay suppliers sooner than their terms require.

It gets shorter when the reverse happens. Ways to bring cash in sooner and time the cash going out are steps 2 and 3 of how to manage cash flow. For upfront payments, see deposit invoicing; for follow-up, see invoice payment reminders.

Why a profitable job can still leave you short

If your books record a sale when you invoice, the profit shows up before the cash does. Until the client pays, you pay bills from the cash you already have. The sample below shows a job that earns a profit and still leaves the business short for weeks. For the balance-sheet view of the same idea, see what is working capital; for how cash and profit are reported, see what is a cash flow statement.

Sample: measuring the gap on one job

These are sample figures for a fictional print shop.

Day 0: paper and ink for a job arrive. The supplier's terms are net 30, for $6,000.
Day 20: the job is finished and delivered. The shop invoices the client $9,000 on net 45 terms.
Day 30: the shop pays the supplier $6,000.
Day 65: the client pays $9,000.

Cash cycle: 20 days (inventory conversion) + 45 days (receivables collection) - 30 days (payables deferral) = 35 days. That matches the timeline: from day 30 to day 65, the shop has paid $6,000 and hasn't been paid. The job earns $9,000 - $6,000 = $3,000 of gross profit, yet for 35 days the shop is $6,000 out of pocket.

Change one thing: invoice on net 30 instead of net 45. The client pays on day 50, and the cash cycle is 20 + 30 - 30 = 20 days. The same $6,000 is out for 15 fewer days.

Where Billed fits

Billed's invoice software page says:

"Set a due date on each invoice so your client knows when to pay."
"Clients can link a credit card to make recurring payments easier, and each recurring profile keeps its invoices and payments in one place."

Billed's recurring invoices page says: "Negotiating fixed prices and sending recurring invoices makes it easier for you to forecast your income and upcoming workload."

When this guide isn't for you

If you're deciding whether to borrow, use a line of credit or sell invoices to cover a gap, ask your accountant or your bank. For how selling invoices works, see what is invoice factoring.

Quotes are from OpenStax Principles of Finance (section 19.1) and billed.app, as published on October 30, 2026.

Frequently Asked Questions

What is a cash flow gap?

It's the time between paying for the work you deliver and receiving the client's payment for it, while the business covers the costs from its own cash. OpenStax measures this timing in days as the cash cycle, also called the cash conversion cycle.

How do you measure a cash flow gap?

Use the cash cycle: the inventory conversion period plus the receivables collection period, minus the payables deferral period, all in days. In the sample on this page, 20 + 45 - 30 gives 35 days.

Can a profitable business have a cash flow gap?

Yes. A job can earn a profit and still leave you short of cash until the client pays. In the sample, a job with $3,000 of gross profit leaves the shop $6,000 out of pocket for 35 days.

What shortens a cash flow gap?

OpenStax says: "Shortening the inventory conversion period and the receivables collection period or lengthening the payables deferral period shortens the cash conversion cycle." In practice, that means getting paid sooner, holding inventory for less time, or paying suppliers later within their terms.

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What Is a Cash Flow Gap? Meaning, Causes and an Example