Cash flow basics, or why profitable businesses go broke

Profit is an opinion about a period. Cash is what’s in the account on Friday when payroll runs. Plenty of profitable businesses have died surprised, and the mechanism is always the same: the P&L said things were fine, and the calendar disagreed. Cash flow is the discipline of watching the calendar.

I learned this one behind a bar, watching a profitable pub sweat through slow winters. Here’s the plain-language version.

Profit and cash are different animals

Your P&L can show a great month while your account runs dry, because several of the biggest cash movements barely touch the P&L:

• Loan principal payments. Only the interest shows as expense. The principal quietly leaves the account anyway.
• Equipment and big purchases. Often spread across years on paper (depreciation) while the cash left all at once.
• Owner draws. Money you take out isn’t a P&L expense, and it’s absolutely gone from the account.
• Timing gaps. You earned it in March; the P&L books it in March; the customer pays in May. Payroll, unfortunately, still runs in April.

Run the movie in reverse for the flip side: a month can look terrible on the P&L while cash is fine, because a slow season coincided with customers finally paying old invoices.

A bakery that was doing everything right

Here is what this looks like in a real business.

I started working with a local bakery that was about 2 years old. Their books were clean. What they did not have was anyone going over the books with them.

By their own metrics they were doing very well. Lots of daily foot traffic. A wholesale business to local cafes and corporate clients that was growing. From where the owner sat, money coming in was higher than money going out. So why did they keep having less and less cash on hand?

The easy answers were right there. Ingredient costs were rising. Their energy bill had spiked, same as everybody else’s. But costs rising is part of business, and that was not the whole story.

The whole story was in the terms. That growing wholesale side was set up on 30 and 60 day payment terms. Meanwhile they were paying for raw ingredients right away. So the better the wholesale business did, the more of their cash went out the door early and sat in accounts receivable waiting to come back. They had plenty of money. It was just money owed to them, which does not help you meet payroll on Friday.

The moment the owner understood it, she said what most owners say: oh my goodness, I am tying up all my money in money owed to me, and I am doing it to myself.

The fix was not dramatic. We tightened the wholesale credit terms from 30 and 60 days down to 14. We automated part of the process so invoices went out on time and reminders went out on time. They started collecting cash much, much faster, and the crunches they had unwittingly created for themselves stopped happening.

Nothing about that business was broken. The owner was good at her craft and her books were accurate. She just needed someone to read them with her.

The 3 classic cash traps

The growth trap. Growth eats cash before it feeds you. A big new contract means hiring, inventory, and materials now, against revenue that lands in 60 days. Businesses have grown themselves to death; it’s the most counterintuitive failure mode in small business.

The seasonality trap. Restaurants know it, landscapers know it, retailers know it: fat months subsidize lean ones. The trap is spending like the fat months are the baseline. My pub’s January was paid for by December, every year, on purpose.

The receivables trap. Every unpaid invoice is an interest-free loan you’re making to someone else’s business. Let aging drift and you’re the bank now, with none of the fees. A follow-up rhythm on receivables is cash flow work, not rudeness.

The habit that prevents all 3: a 13-week forecast

The tool is humbler than it sounds: a grid. Weeks across the top, money in and money out down the side, based on what you know is coming: payroll dates, rent, loan payments, tax deadlines, expected customer payments. Update it weekly; 20 minutes once it exists.

What it buys you is time. Cash problems are survivable when seen 6 weeks out: you chase receivables, delay a purchase, arrange a line of credit calmly. The same problem discovered on Thursday before payroll has fewer and uglier options. The forecast converts emergencies into decisions.

A rough forecast this week beats a perfect one someday. Real numbers from your books, honest guesses where needed, and a weekly update habit.

What to watch monthly

Alongside the weekly grid, 3 numbers worth a monthly look:

1. Cash on hand vs. monthly expenses. How many months could you run if income stopped? 2 to 3 months of runway is a common target; seasonal businesses want more.
2. Receivables aging. Who owes you, how much, how old. Anything past 45 days needs a plan, not hope.
3. The gap between profit and cash change. If the P&L says +$6,000 and the account went down, name where the difference went: loan principal, draws, equipment, receivables. Naming it monthly keeps it from compounding silently.

Where a bookkeeper fits

Forecasting built on messy books is fiction with a spreadsheet. Clean, reconciled monthly books come first; they’re the raw material. From there, a bookkeeper turns your pattern into a working forecast, keeps it updated against actuals, and answers the question behind all of this: can we afford it, and when?

That question, asked before decisions instead of after, is most of what separates businesses that feel in control from businesses that feel lucky. The relief owners describe when they finally see their cash clearly is the reason this service exists.