Your P&L can lie. Your bank account can’t.

Every engagement starts the same way: an owner slides a P&L across the table that says the business made money, and a bank balance that says otherwise. One of them is wrong. It is never the bank balance.

Revenue is a story. It depends on when you recognized it, what you counted, and how optimistic the person doing the counting was feeling. Profit is an opinion. A useful one, but an opinion built on allocations, accruals, and estimates that can each drift a few degrees without anyone noticing.

Cash is a fact. It cleared or it didn’t.

When we open a Diagnostic, we don’t start with the income statement. We start with three reconciliations:

1. [1]Cash per books vs. cash per bank. If these don't tie, nothing downstream can be trusted. In most first-time engagements, they don't tie.
2. [2]Revenue per invoices vs. revenue per deposits. The gap between what you billed and what landed is where unbilled work, write-offs, and quiet discounts hide.
3. [3]Payroll per the ledger vs. payroll per the provider. Your biggest expense, checked against the one system that can't be fooled about it.

“If the books and the bank disagree, believe the bank. Then fix the books so you never have to choose again.”

Owners almost always sense the truth before the statements admit it. The P&L says 12% margin; the stomach says payroll was tight twice this quarter. That instinct is data. The job of a finance function isn’t to argue with it. It’s to build a system where the reports and the stomach finally agree.

That’s what the 13-week cash forecast is for. Not because forecasting is fun, but because it forces every optimistic story the P&L wants to tell through a single filter: does the cash actually show up on the date the story says it will?

Pull your last three months of statements and your last three months of bank activity. Tie them. If they tie cleanly, your books deserve more trust than most. If they don’t, that gap is the most honest number in your business right now, and it’s worth four weeks of someone’s full attention.