01Step one: work out your baseline month
Add up what you actually spend in a normal month: housing, food, utilities, transport, insurance, the autónomo quota and what you set aside for tax. That is your baseline month. It is the figure you must cover no matter what. If you do not know it, look at the last three months of statements and average the fixed expenses.
02Step two: pay yourself a salary from a buffer account
Everything you earn lands in the business account. From there you transfer the same amount to your personal account each month, your salary, even when more came in. What is left stays in the business account as a buffer for months when less arrives. This way your personal life has a payslip even if your business does not.
03Step three: percentages per invoice, not amounts per month
Every time an invoice is paid, split it by percentages: all the IVA to the reserve account, 20% of the base minus withholding there too, and a fixed percentage (say 10% of the base) to savings. Because they are percentages, they adapt to the size of the month on their own. An 800 € month sets aside little, a 5,000 € month sets aside a lot, and you decide nothing.
04Step four: a fund of three to six months
With a salary, three months of emergency fund is the usual advice. With irregular income, six. It is not for medical emergencies: it is for the client who pays at 90 days, for August and for the project that falls through. It is sized on your baseline month and lives outside the accounts you look at daily.
05Step five: plan for seasonality
Almost every activity has high and low months. If you build websites, December is slow. If you do tax work, August is. Look at your income by month over the last two years and the pattern appears. Knowing that November usually brings double what January does, November's surplus is not a bonus: it is January's salary in advance.
06What gets set aside but is not savings
Collected IVA and the 20% IRPF are not savings. They are debt to Hacienda you already owe. If you count them as buffer, the quarter will take them. That is why the tax reserve account is different from the buffer account and different from the emergency fund. Three accounts, three different questions.
07How Fider helps
Fider shows your freelance wallet with the quarter's accumulated IVA and the estimated 130, so the balance you see already excludes what is not yours. Savings goals carry a date and tell you how much is missing each month. And recurring transactions show how much of the month is already committed before it starts.