The 90-Minute Month-End: A Founder’s Close Without an Accountant

Ask a founder how last month went and you'll usually get the bank-balance answer: “we're fine, there's money in the account.” It's the most natural measure in the world and it's nearly useless, because the balance is a lagging indicator wearing the costume of a current one. It contains the invoice that hasn't been paid yet, the annual renewal that hits Thursday, the client who quietly went from net-30 to net-75, and the three subscriptions that crept up in price — all invisible, all already true. By the time the balance itself tells you something is wrong, it's been wrong for a quarter.

Real companies solve this with a month-end close: a finance ritual where the books get reconciled, reviewed, and locked. You don't have books in that sense, and you don't need them. What you need is the founder's version — ninety minutes, first business day of the month, same seat, same coffee. Here is the whole thing.

Step one: reconcile reality against memory (20 minutes)

Open the bank and card statements for the month that just ended and read every line. Not to bookkeep — to catch the gap between what you think you spend and what you spend. You are looking for exactly three things: charges you don't recognize (fraud is found in this pass or not at all — and the payment-change scam is found here too), charges you recognize but forgot (the annual renewal that lands like a surprise every single year), and amounts that changed without you agreeing to anything. Twenty minutes, a highlighter, done.

Step two: sweep the money owed to you (15 minutes)

List every invoice you've sent that isn't paid, next to its due date. This is your accounts receivable aging, and it doesn't care how it's formatted — a sticky note beats not knowing. The discipline is the follow-up rule attached to it: anything past due gets a note today, in the same sitting, while the list is open. Not because one late invoice matters, but because payment behavior drifts in the direction you tolerate, and a vendor who is paid at 60 days trains every client watching to pay at 60 days. The sweep takes fifteen minutes precisely because you did it last month too.

Step three: the subscription delta (10 minutes)

Against last month's close note (step five — it feeds this), answer one question: what recurring spend appeared, disappeared, or changed size? New tools that arrived as trials and stayed as line items, seats added for people who left, prices that stepped up at renewal. You ran a full sprawl audit once; this is the maintenance dose that keeps you from ever needing another archaeology dig.

Step four: the three numbers (15 minutes)

Now compute the only three numbers on the scoreboard, and write them next to last month's:

• Runway direction. Cash today, minus cash this day last month. Not the balance — the slope. A healthy balance falling $6,000 a month is a countdown timer; the balance won't say so, the slope says nothing else.
• Total owed to you, and its age. Receivables climbing while revenue is flat means you're becoming your clients' bank — the classic quiet cash crisis, visible here two months before it reaches the account.
• Recurring monthly out. The sum of everything that charges without asking. This number only ever ratchets upward unattended — watching it monthly is what keeps it a decision instead of a drift.

Step five: the one-page note (10 minutes)

Close by writing five sentences: the three numbers, anything that surprised you, and the one thing you'll do differently this month. This page is what turns the ritual from a status check into a system — it's next month's step three, it's the record that shows the slope over a year, and the day you bring on a bookkeeper or a fractional CFO, twelve of these pages are the best onboarding document they will ever receive.

What this replaces

Nothing about the ninety minutes requires software, an accountant, or accounting knowledge — which is exactly the point. The founder version of a close isn't a worse copy of the real thing; it's the subset that produces decisions. Accuracy to the penny is what audits need. Direction, a week after the month ends, is what founders need — and direction is cheap. The expensive thing is October discovering what July already knew.

The bottom line

The bank balance answers “can I make payroll Friday.” It cannot answer “is this working” — for that you need the slope of your cash, the age of what you're owed, and the size of what charges you automatically, checked on a fixed morning each month while the numbers are still small enough to argue with. Ninety minutes, five steps, one page. The founders who do this aren't the ones with a gift for finance. They're the ones who decided that surprise is a controllable expense.

— Tom