How to Do a Weekly Cash-Flow Check in Under an Hour

Why this matters

Most shops that fail were profitable on paper right up until the week payroll did not clear. Profit is measured over a month; cash is what is in the account on a given Friday, and the two rarely move together. A short weekly check tells you if you can cover what is coming before it becomes a crisis. It takes under an hour, it needs no accounting degree, and it is the single habit that turns "I think we're okay" into "I know we're okay through the next three weeks." See related: Cash vs Profit: Why They're Different.

Set a fixed weekly slot and pull the same numbers

Pick one time a week and protect it. Monday morning before the trucks roll works well because it sets up decisions for the week. Same time, every week, or it will not happen.

Before you start, have three things open: your bank balance, your list of unpaid customer invoices (accounts receivable), and your list of bills and obligations coming due (accounts payable, payroll, taxes). If you invoice and track jobs in one system, most of this is already there.

Step 1: Write down today's real cash position

Start with the actual bank balance, then subtract anything that has not cleared yet: checks you wrote, payments already scheduled to go out. What is left is your true starting cash, not the optimistic number the banking app shows. This one figure is the anchor for everything that follows.

Step 2: List the money coming IN over the next few weeks

Go through your unpaid invoices and, for each one, make an honest guess at which week it will actually land. Not when it was due, when it will really pay. Group them by week for the next four to six weeks.

• A customer who always pays fast goes in the near column.
• A slow payer or a big commercial account on long terms goes further out.
• An invoice already past due and quiet gets discounted or moved to "unknown," not counted as sure money.

The discipline here is honesty. Counting hoped-for money as certain is how the check fails you.

Step 3: List the money going OUT over the same weeks

Now the obligations, by week. Be complete, because the bills you forget are the ones that bite:

• Payroll, including your own draw and the payroll taxes that ride with it.
• Suppliers and material accounts with a due date in the window.
• Rent, insurance, truck payments, software, utilities.
• Loan payments due in the period.
• Taxes coming due, especially quarterly estimates and any sales tax you hold and remit. That sales tax is not your money; it is the government's, sitting in your account. Treat it as already spoken for.

Step 4: Roll the weeks forward and find the low point

For each week, take the prior week's ending cash, add that week's money in, subtract that week's money out. The result is where you end that week, and it becomes the start of the next. Walk it forward four to six weeks.

You are hunting for one thing: the lowest point in the run. If every week stays comfortably positive, you are fine and the check is done. If any week dips near zero or below, you found a squeeze weeks before it would have surprised you, which is the entire point of doing this.

Step 5: Act on a squeeze while you still have room

A squeeze spotted three weeks out has cheap fixes. The same squeeze spotted the day payroll runs has none. When a week goes tight, work the levers in order of least pain:

• Pull cash in faster: call on the largest past-due invoices, offer a card payment link, invoice anything sitting uninvoiced (see related: How to Invoice the Same Day the Work Is Done).
• Push non-critical cash out later: delay a discretionary purchase, ask a supplier for a few more days, hold off on a truck you do not need this week.
• Never delay the untouchables: payroll and taxes come first. Solve the gap around them, not through them.

Keep a simple record so next week is faster

Save the forecast, even a photo of a legal pad. Next week you update it instead of rebuilding it, and it shrinks to fifteen minutes. Over a few months you also learn your own pattern: which weeks always run tight, which customers always pay late, how big a cushion you actually need. That pattern is worth more than any single week's number.

The mental model to keep

Profit tells you whether the business works. Cash tells you whether it survives long enough to find out. Run the profit question monthly and the cash question weekly, and most money surprises disappear before they reach you.

References

• See related: Cash vs Profit: Why They're Different
• See related: How to Close the Books at the End of the Week
• U.S. Small Business Administration (SBA), cash-flow management for small business
• Trade-standard practice for short-horizon cash forecasting