50/30/20 rule calculator
The rule splits net income into 50% for needs, 30% for wants and 20% for savings and debt. The percentages are editable, because in Madrid or Barcelona the 50 rarely fits.
- Wants
- €600.00
- Savings and debt
- €400.00
This is a simulation based on what you typed. It does not replace your books or your advisor.
Take it into your Fider accountHow to use it
- Enter what lands in your account each month, after tax.
- Keep 50/30/20 or adjust the percentages to your city and your moment.
- Compare each block with what you actually spend in that category.
- If rent alone eats the 50, try 60/20/20 and protect the savings block.
What goes in each block
Needs: housing, utilities, food, transport, insurance and minimum instalments. Wants: restaurants, leisure, subscriptions, clothes you do not need. Savings: emergency fund, investing and paying debt above the minimum.
If you are self-employed
Net income is not what you collect. It is what is left after setting aside VAT, IRPF and the quota. Work that out first and apply the rule to what is genuinely yours.
The rule is not a law
It is a starting point to spot imbalances. If the needs block passes 60%, cutting wants does not fix it; housing or income does.
The split is indicative. What matters is comparing each block with your real spending and seeing where it breaks.
Frequently asked questions
Do the percentages have to add up to 100?
They should. The calculator does not stop you, so you can look at a partial split, but a real plan adds up to 100.
Is the mortgage a need or savings?
The instalment is a need. Anything you overpay above the instalment is savings.
What about variable income?
Apply the rule to your baseline month, the minimum you almost certainly earn, and treat the rest as extra for the savings block.
Does it work for a couple?
Yes, with net incomes added and household expenses. Each person can keep their own wants block.
How do I track it monthly?
With budgets per category. Fider draws each with a consumption bar that fills with every expense.