Paid on the first. Broke on the fifteenth.

For a long stretch of my working life I was on a salary. The money arrived on the first of the month, all of it at once, and from that moment it was my job to make it last until the next first.

It didn't always.

Some months I got to the fifteenth and there was nothing left. No disaster, no big purchase, no emergency. Just nothing. Then I'd spend two or three days going back over it in my head, trying to work out what I had actually done with a whole month's money in two weeks. I never found one big answer, because there isn't one. It goes in small pieces, each of them reasonable, none of them written down.

If you've been there, you know the feeling isn't really about money. You weren't poor that month. You were paid. You just couldn't account for your own life.

The trap in a single payment

A monthly salary looks like security, and in one way it is. But it hides a trap. On the first you're holding the whole month in your hand, and the whole month feels like a lot. The rent, the electricity, the phone, the insurance, the car: they don't all fall due on the first. They're spread across the calendar, and on the first they're invisible.

So the money looks bigger than it is, and you live like it is. One coffee becomes two. The bus becomes a taxi, because you're tired and it's only this once. You eat out, and on the way home you order something for later as well. None of it is a mistake on its own. Each one is small, each one is deserved, and on the first of the month each one looks like nothing next to the total. But you're spending from the total, and the bills come out of whatever survives.

By the time the last ones arrive, what survives is the fifteenth.

My mother's sheet of paper

My mother was an accountant for forty years. She watched me do this a couple of times, then sat me down with a sheet of paper and a pen. No software. She drew three columns.

In the first, the money that was certain. Not what I hoped to earn, not the bonus that might come. Only what would definitely arrive.

In the second, every cost I already knew about. Rent, utilities, phone, transport, the loan, the insurance. Everything with a date on it, written down before the month started, not remembered when the bill came.

The third column was the one that changed things. Ten to twenty per cent of the income, taken off the top and written down as already spent. In Romanian we call it “God forbid” money: for the tyre that goes, the tooth that breaks, the washing machine that picks the worst possible week. And the rule was simple.

That money doesn't exist. You don't count it when you look at what you have. You pretend it isn't there.

What was left after the three columns was the real amount I had to live on. Smaller than the number on the first. Much smaller, the first time. But it was true.

Why it works

Nothing on that paper was clever. Every line was something I already knew. The difference was the order. Before, I spent first and paid the known costs from what was left. After, the known costs and the God-forbid money came off before I spent anything, and I only ever spent what was genuinely free.

The fifteenth stopped being a wall. Some months the God-forbid money got used, because God doesn't always forbid. Most months it just sat there and grew, and that did something the paper couldn't do on its own: it turned a bad week into an inconvenience instead of a crisis.

And I stopped spending two days at the end of every other month reconstructing where my salary had gone. It was written down before it went.

Years later, running companies, I watched businesses get into cash trouble in exactly the same way: counting the total that came in and forgetting the costs that hadn't arrived yet. The sheet of paper works the same for a family as it does for a firm. Only the numbers get bigger.