How to Make a Monthly Budget: 6 Steps With a Worked Example

You get paid, the bills go out, and by the 20th you check your balance before every coffee. You know you "should have a budget", but most guides stop at "list your income and expenses".

In short: a monthly budget answers one question: how much can I spend on wants this month without touching the rent or my savings? Pay essentials first, set savings aside second, and what's left is your spending limit. Then check that the money arrives before the bills do.

The order that makes a budget hold

Net income
minus essentials
minus savings
= your spending limit for wants

A worked example

Made-up but realistic: one person, €2,400 net income a month, €1,450 of essentials (rent, utilities, groceries, transport, insurance, minimum loan payment) and a savings target of 20%.

One month, in the order you pay it
	Amount	Share of income
Net income	€2,400	100%
Essentials	€1,450	60%
Savings (20% target)	€480	20%
Spending limit for wants	€470	20%

€470

What this person can spend on wants this month, after essentials and savings are covered

Two things stand out:

Essentials take 60%, not the 50% of the classic 50/30/20 rule. That's normal for one income and a rented flat. The rule is a starting point, not a test you fail. If your essentials are high, wants shrink first, not savings (50/30/20 for busy parents shows the 60/20/20 and 70/10/20 versions).
€470 is the number to live with. Not €2,400, and not "whatever is left on the 30th". Knowing it on the 1st is the whole point of a budget.

The six steps

1. Write down your net income and the dates it arrives

Use the amount that reaches your account, not your gross salary. Note the date of each payment for the next two or three months. If your income varies (bonuses, freelance invoices), plan on the lowest month of the last six and treat anything above it as extra.

2. List every fixed bill with its due date

Rent or mortgage, insurance, loan payments, phone, subscriptions. The due date matters as much as the amount: a bill due on the 1st and a salary that arrives on the 10th is a problem even if the month adds up.

3. Estimate variable essentials from real statements

Groceries, utilities, fuel and public transport change from month to month. Don't guess: take the last three to six months from your bank statements and use a typical month, not the best one. Expense tracking shows how to turn statements into a range.

4. Set the savings amount before you spend

Move it on payday, with a transfer you set up once. Savings that wait for "what's left at the end of the month" usually turn out to be zero. If you have no emergency fund yet, that's where the money goes first (building an emergency fund).

5. Check the timing week by week

Starting balance + money coming in − bills due that week = balance at the end of the week. Do it once for the coming month. If one week goes negative while the month as a whole is fine, you have a timing problem, not a spending problem: move a due date, or keep a small buffer in the account (paycheck timing).

6. Compare plan and reality at the end of the month

Ten minutes is enough. If an essential was higher three months in a row, raise its estimate; it isn't a failure. A budget that never changes is usually one nobody looks at.

Where this method breaks

Essentials cost more than your income. No split fixes that. The choice is between raising income, lowering a fixed cost (rent, a loan, a car) or both. A budget shows the gap clearly; it can't close it.
Yearly bills. Car insurance, property tax and holidays don't come every month, so a monthly budget forgets them. Divide each by 12 and set that amount aside every month.
Two incomes. A couple needs to agree on what is shared and what is personal before the numbers mean anything.
It's a plan, not a forecast. The first two months will be off. That's how you learn your real numbers.

Try it with your own numbers

Enter your net income and your essentials in the free 50/30/20 budget calculator. It shows the classic split next to what your essentials actually leave for savings and wants. With the example above (€2,400 and €1,450) you'll see the same €480 and €470.

One thing to do today

Open your banking app, find the day your salary arrives and the day your rent or biggest bill is due, and write the two dates down side by side. If the bill comes first, start with step 5.