One hour a month. That's all it takes to know where your money goes — provided you do it with a system, instead of scrolling and hoping something jumps out.

The statement audit is the simplest form of financial control: no app, no tool, no spreadsheet required. Just 60 minutes, four phases, three questions per cluster.

Phase 1 — Check income (5 min)

Is the salary right? Did all reimbursements, rental income, side earnings arrive? Sounds trivial, isn't: across a sample of 200 audits, 8% of incoming entries don't match expectations. Wrong tax class, forgotten health-insurance refund, outstanding expenses.

Phase 2 — Fixed costs vs. the list (15 min)

You need a fixed-cost list, set up once: every entry that goes out monthly at a fixed amount (rent, utilities, internet, insurance, subscriptions). Every transaction on it: tick off. Anything debited that's not on the list: question it — what is this, do I want it?

80% of saving effects happen here. Forgotten subscriptions, silent rate hikes, double charges.

Phase 3 — Cluster variable spending (25 min)

Remaining transactions into five to seven clusters: groceries, restaurants, transport, shopping, hobbies, other. Sum per cluster. Don't tag each transaction individually — sums only.

Three questions per cluster:

  • Was that the planned amount? (Not: realistic. Planned.)

  • Is there a single item that surprises me? (Over €80 in one go, or over €30 unplanned.)

  • Is there a pattern I don't like? (e.g. five delivery orders in two weeks.)

Phase 4 — Note anomalies (15 min)

From the three phases comes a list of 2–5 items: "cancel streaming sub X", "raise grocery budget next month", "check phone plan". That list is the output. Nothing more.

Important: don't optimise everything at once. Coming out with 12 to-dos means doing zero of them. Two per month, but actually.

The annual deep audit

Once a year: same method, but on 12 months of data. Sort top-20 expense items, label each "keep / cut / kill". 12 months of data reveals patterns a single month hides — like creeping utility hikes or the gradual rise of the office lunch.

What the audit replaces

The attempt to categorise every transaction every day. The nagging pull to maintain a perfect app forever. The self-deception that "not looking" equals "it's fine."

One hour per month is the lowest sensible frequency. Hold that pace and within a year you'll know more about your money than someone who installed ten apps and opens none.