Every mainstream budgeting app is built on the same assumption: that the path to controlling money is recording where it goes, transaction by transaction, category by category. The five-number method starts from the opposite observation — you don't have a spending problem, you have a visibility problem — and it fixes visibility with five numbers instead of five hundred transactions.
The case against tracking everything
Transaction tracking fails for a predictable reason: it costs attention every single day, and pays out insight about the past. Skip a week and the backlog turns into guilt; the guilt turns into abandonment. Studies of app behaviour and a decade of Reddit budgeting threads tell the same story — the modal outcome of "track everything" is "stopped tracking".
Meanwhile the information you actually need is almost entirely static. What you earn, what you're committed to, what you owe, what you've saved: these change a few times a year, not a few times a day.
The five numbers
Income. Bills. Subscriptions. Debt. Savings.
From these, two derived numbers do all the work:
- What's left — income minus commitments: the amount your life is allowed to cost this month. Not a target; a fact.
- Net position — savings minus debt: the single truest measure of financial progress that exists.
Why monthly is the right frequency
Money moves on a monthly rhythm — salary in, rent out, subscriptions cycle. Checking daily is watching noise; checking yearly is too late to steer. A monthly check-in on payday matches the actual frequency of change, which is why it takes two minutes: most months, you confirm that nothing moved, watch the position line tick, and close the tab. The routine is small enough to survive contact with real life. That is the entire trick.
What the line teaches
Watch net position for three or four months and something shifts: money stops being a fog of transactions and becomes a direction. Raises, cancelled subscriptions and paid-off debts all show up as changes in slope. So does lifestyle creep. You stop asking "where did it all go?" — you can see exactly where it went, at the only resolution that matters.
Using the method
Everything above works on paper or in any spreadsheet — the method has no vendor. If you want it with the check-in reminders, the projections and the line drawn for you, it is also exactly what Gen Finance is: the five-number method as an app, €4 a month, no bank login, because the method never needed one.