Start with data you can recognise
Collect actual available net income and expenses for a representative period. For variable income, avoid building recurring expenses on the best month: use a conservative assumption and keep the amounts that are still uncertain separate. A transfer between two of your accounts is not new income; the card payment does not need to be counted again if you have already registered the individual purchases.
Separates three types of output
- Applicants: rent, installments, subscriptions. They are predictable, but not necessarily immutable.
- Variables: food, transport, leisure. Look at the actual amounts before setting a limit.
- Periodicals: insurance, maintenance and other non-monthly deadlines. Dividing an annual expense by twelve helps prepare for it.
The money set aside for a known deadline is not all available for other goals. Likewise, a positive account balance may include sums already earmarked for upcoming payments.
How much margin remains?
Enter monthly amounts in euros. The calculation subtracts the expenses and provisions you indicate from your income.
Revenue − expenses − provisions. Simplified example: does not consider unincluded items, returns or future changes. The values are processed in the browser and are not sent.
Read the result, without judging yourself
If the margin is negative, first check for missing items, duplications and exceptional expenses. Then distinguish what you can change immediately from commitments that require more time. If it is positive, evaluate how much to allocate to unexpected events and how much to objectives: it is not automatically a sum to invest.
Review your budget after a month and when an important condition changes. An overly detailed model that you abandon after a few days is less useful than a few regularly updated categories. The budget is an observation tool, not a grade on your discipline.