Track Every Expense for a Month

Ask most people how much they spent last month and they will give you a number. Ask them to break it down and the number starts to fall apart. Rent and bills are easy to remember; the coffee on the way to work, the delivery on a tired Thursday, the app subscription you forgot about and the small things bought at the kiosk are not. In Argentina these have a name, gastos hormiga — ant expenses — because each one is tiny, but together they carry away a surprising amount of food from the pantry.

There is a reason they are so easy to miss. Economists Drazen Prelec and George Loewenstein described the "pain of paying": handing over money produces a small, real discomfort that makes us think twice. Cash hurts the most, because you watch it leave. Cards, transfers and phone payments dull that pain almost to zero, and installments spread it so thin that it disappears. The result is that the ways we pay today are perfectly designed to make spending invisible. Writing each expense down puts a little of that pain back, on purpose.

The exercise is simple: for thirty days, record every single expense, the moment it happens, no matter how small. Note the amount, what it was and roughly what kind of spending it was — housing, food, transport, going out, subscriptions. Do not try to change anything yet. The goal of the first month is not to save; it is to see. Changing your habits while you measure them will give you a flattering picture instead of a true one, and the true one is what you need.

At the end of the month, add things up and look for three things. First, the fixed core: what you must pay no matter what, which tells you the minimum your life costs. Second, the leaks: small, repeated expenses that you would not choose if someone asked you upfront — the subscription you never use, the third delivery of the week. Third, the surprises: categories that are much bigger than you thought. Almost everyone finds at least one. That gap between what you believed and what the numbers say is exactly where your first easy savings live.

In Mingüini, the Finance module is built for this. Log each purchase in Expenses as it happens, and set rent, services and subscriptions as monthly recurring expenses so you only enter them once. Card purchases in installments can be split automatically, so each month shows what you really owe. Incomes go in the same way, and the Dashboard tab shows your income, your expenses and your net balance for the month, in each currency you use. Make it a habit — add "log today's expenses" to your evening routine in Habits — and after thirty days you will know your money better than most people ever do.