The 50/30/20 rule explained with a €1,800 monthly salary

The 50/30/20 rule splits your net salary into three parts: 50% for needs, 30% for wants and 20% for savings. On €1,800 net a month, that's €900 for needs, €540 for wants and €360 for savings. That €360 is what makes the rule real. Put them into a goal with a date, and the savings goal calculator shows how many months it takes to get there and how much to set aside each week and each day.

What the 50/30/20 rule is

The idea is simple. Instead of tracking every expense across twenty categories, you look at just three boxes.

• Needs (50%). What you would still have to pay if you lost your job tomorrow: housing, food, utilities, getting to work, compulsory insurance and the minimum payment on any debts.
• Wants (30%). Everything you could stop paying without your life falling apart: eating out, clothes you don't need, holidays, subscriptions, presents.
• Savings (20%). What you put aside for later. Many versions of the method also count paying off debt above the minimum here.

The rule works on your net salary: what reaches your account each month after social security and income tax. In Spain many salaries include extra payments, often in summer and at Christmas. If yours does, add up a full year and divide by 12, so June and December don't give you a false picture.

Why €1,800 net a month

It's a round example, not an average. For a sense of scale, the median gross salary in Spain was €24,497.17 a year in 2024, and the mean was €29,540.26 Spain's national statistics office, INE, Annual Wage Structure Survey 2024, final data (in Spanish). Half of all employees earn less than the median. The mean comes out higher because a small number of very high salaries pull it up. The most common salary, the one more people earn than any other, was €16,520.18 gross a year INE, Annual Wage Structure Survey 2024: modal salary (in Spanish).

Those are gross figures, before tax and social security, so they can't be compared directly with €1,800 net. If your net pay is different, the maths in this guide works the same way: multiply your net figure by 0.5, 0.3 and 0.2.

The split on €1,800 a month

The table is an example for someone living alone in a flat share or on a moderate rent. The lines are our own assumptions, there to show how each box fills up. They are not official averages.

Look at the first line. With €450 for housing, the split works. If housing costs twice that, it doesn't: at €900 in rent, the needs box is full before you've bought any food. That's why the next section matters more than the table.

When housing takes more than 50%

In Spain, housing is the biggest item in most budgets. According to the Household Budget Survey, the average household spent €35,101 in 2025, and 33.2% of it went on housing, water, electricity, gas and other fuels INE, Household Budget Survey 2025, final results (in Spanish). That average includes people who already own their home outright: INE adds an imputed rent for owners. For the 20% of households that spend the least, housing, utilities and food together took 61.5% of their budget INE, Household Budget Survey 2025: lowest spending quintile (in Spanish), more than the rule leaves for all needs put together.

Renters feel it most. In 2025, 26.8% of people in Spain paying rent at market price lived in a household that spent more than 40% of its disposable income on housing Eurostat, housing cost overburden rate by tenure status (ilc_lvho07c), Spain, tenants at market price, 2025. That 40% line is how Eurostat defines housing cost overburden Eurostat, Statistics Explained, glossary: housing cost overburden rate. On €1,800 net, 40% is €720 a month just for the roof over your head.

If that sounds like you, don't throw the rule away. Adjust it like this:

1. Write down what you really pay. Add up your real needs for the month. If they come to €1,100, your needs box is 61%, not 50%.
2. Protect savings before wants. That leaves €700. Decide first how much you set aside, and leave the rest for wants. Saving €360 leaves €340 to live on; saving €270, which is 15%, leaves €430.
3. Save less, but every month. A small, fixed monthly target is worth more than a 20% you only manage two months a year. If €100 is all you can set aside today, start there.
4. Look at housing when you can. It's the item that moves the split the most. Moving, sharing or renegotiating when your contract comes up changes your numbers far more than cutting out ten coffees.

What to do with €360 a month

Your 20% won't get you far if it goes into an account with no name and no date. Three months later it's been spent on something else. The way to make it last is to give it a goal.

An example: start with an emergency fund

An emergency fund usually covers three to six months of essential costs Finanzas para todos (financial education plan of the CNMV and Banco de España), “How much should your emergency fund be?” (in Spanish). With needs of €900 a month, three months is €2,700 and six months is €5,400. Setting aside €360 a month, the calculator gets you to €5,400 in 15 months: about €83 a week, or €11.84 a day. You'll have the first three months covered in just over seven months.

This money isn't for investing: it has to be there the day the boiler breaks down. That's why people usually keep it in a savings account or an interest-paying account kept apart from their everyday one, where it doesn't get mixed up with spending. The emergency fund page has the breakdown and the calculator set up for that goal.

Then, goals with a date

Once the safety net is full, the €360 keeps coming every month, but it goes to other goals. Here's an example with two goals at the same time:

• A €1,800 holiday in 10 months. According to the calculator, €180 a month.
• A €4,320 car deposit in two years. According to the calculator, €180 a month.

Together they come to €360, your 20%. If you bring a goal forward, its monthly target goes up; if you push it back, it goes down. What matters is that every euro you set aside knows where it's going.

Other versions: 60/20/20 and 70/20/10

The 50/30/20 split isn't the only one. Some versions change the weight of each box. On €1,800 net, they look like this:

• 60/20/20. Leaves more room for needs and keeps savings at 20%, at the expense of wants. It suits someone on a high rent who would rather cut back on going out than on saving.
• 70/20/10. Often told a different way: 70% to live on, 20% to save and 10% to pay off debt or to give away. In the table, the 10% sits in the savings column because each version splits it differently.

None of them is better than the others. Pick the one closest to your fixed costs today, and change it when they change.

Common mistakes

1. Working from your gross salary. 20% of your gross pay is a number you'll never see in your account. Use your net pay.
2. Putting wants in the needs box. A phone is a need; a new phone every year isn't. If everything is a need, the rule tells you nothing.
3. Saving whatever is left over. If you set money aside at the end of the month, there's rarely anything left. Set it aside on payday and live on the rest.
4. Forgetting costs that don't come every month. Car insurance, the yearly vehicle inspection or Christmas presents arrive once a year. Divide them by 12 and put them in their box.
5. Keeping everything in one account. If your savings are mixed in with your everyday money, they get spent without you noticing.
6. Giving up the first month it doesn't add up. One bad month doesn't break the rule. Go back to your monthly target the month after.

What Huchy does with your 20%

Huchy is the savings part of the rule. You create your goals, each with an amount and a date, and Huchy shows your target per month, per week and per day, and how far you still have to go. If you start with an emergency fund, once it's covered you move the monthly target on to the next goal. Huchy doesn't move your money or invest it for you: it keeps track of what you set aside.

Your 20%, in a goal

On €1,800 net, the 50/30/20 rule leaves €900 for needs, €540 for wants and €360 for savings. If housing takes more than half, adjust the boxes, but keep a fixed amount for savings every month. You can start with an emergency fund and move on to goals with a date. Enter your goal, what you've already saved and your deadline in the savings goal calculator to see how much to set aside each month.