Who makes it and how it’s calculated

Who makes it

MoneyLeft is developed by Matteo De Min, Frazione Sant’Antonio 148/4, 10081 Castellamonte (TO), Italy, VAT no. IT13334350017, REA TO-1355715. The same information is in the footer of every page of the site; name and contact details are also on the app’s App Store listing. This is not financial advice: the guides explain how to do the sums, not what to do with your money.

How the daily budget is calculated

In the app, the calculation works like this:

1. The cycle starts on the payday you set, not on the first of the month.
2. Cycle income is taken, and the spending already done is subtracted.
3. Instalments and subscriptions still due in the cycle are subtracted.
4. The result is divided by the days left, today included. If it is below zero, the app shows zero.
5. If there is no income in the cycle yet, it starts from the available balance.

The calculation happens on your phone. It is not artificial intelligence and it is not sent to anyone.

How the examples are checked

Every number in the examples in the guides is calculated with a small program, not by hand, with amounts rounded to the cent. The amounts are invented to explain the method: they are nobody’s averages and they don’t tell you how much you should spend.

Sources

The 50/30/20 rule is described in All Your Worth by Elizabeth Warren and Amelia Warren Tyagi (2005). The rest is arithmetic that you can recheck with a calculator.

If you find a mistake

Write to matteo.de.min@outlook.it: every report is re-read and, if it is right, the page is updated with the new date. For help with the app there is the dedicated page.