Budget calculator

How the 50/30/20 budget works

The 50/30/20 rule splits your monthly take-home pay into three buckets. Half goes to needs, just under a third goes to wants, and a fifth goes to savings and paying down debt. It is popular because it is simple: three numbers to watch instead of twenty categories.

The calculation is plain multiplication:

• Needs = take-home pay times 0.50
• Wants = take-home pay times 0.30
• Savings and debt = take-home pay times 0.20

Take-home pay means the money that actually reaches your bank account after income tax, payroll deductions, and anything taken out at source such as health insurance or a workplace retirement plan. If you are self-employed, use what is left after you set aside money for tax.

What goes in each bucket

The split only works if you sort your spending honestly. A useful test: if you stopped paying it next month, would something serious happen?

• Needs: rent or mortgage, utilities, basic groceries, insurance, transport to work, childcare, essential medical costs, and the minimum payment on every debt.
• Wants: eating out, takeaway, streaming and other subscriptions, clothes beyond the basics, hobbies, gym memberships, trips, and upgrades like a nicer phone plan than you need.
• Savings and debt: your emergency fund, retirement contributions you make yourself, investing, and any payment on a debt above its minimum.

Minimum debt payments sit in needs because missing them has real consequences. The extra you pay to clear a debt faster counts as saving, because it improves your net worth just like a deposit would.

How to read your result

The first panel shows your three targets in dollars. The second panel compares them with what you entered. For each bucket you get two bars: the first is the target share of your pay, the second is your actual share. Below them, a short line tells you how far over or under you are.

The headline number adds up your three actual buckets and compares the total with your pay. A positive number is money with no job yet, which is easy to lose to small purchases. A number marked as over means you are spending more than you bring home, and the difference is coming from a card, an overdraft or your savings.

For needs and wants, being under the target is good. For savings and debt, being over the target is good.

A worked example

The calculator opens with $4,000 a month of take-home pay. The targets are $2,000 for needs, $1,200 for wants and $800 for savings and debt.

The example spending is $2,200 on needs, $1,050 on wants and $550 on savings. Here is how that compares:

• Needs are $200 over the target, at 55% of pay instead of 50%.
• Wants are $150 under, at about 26.3% of pay.
• Savings are $250 short, at about 13.8% of pay.

The three add up to $3,800, so $200 a month is left over with no plan. Moving that $200 into savings would bring the savings bucket to $750, only $50 short of its $800 target. The quickest fix here is not cutting back hard, it is giving the spare money a job.

Mistakes to avoid

• Using gross pay. Your salary before tax is a bigger number than you actually have to spend. Using it makes every target too high.
• Calling wants needs. A phone is a need. The most expensive plan and a new handset every year are partly wants. Be honest, or the comparison tells you nothing.
• Guessing your spending. Pull two or three months of bank and card statements and average them. Most people underestimate wants.
• Forgetting irregular costs. Car repairs, annual subscriptions and gifts do not show up every month. Divide the yearly total by 12 and include it.
• Giving up when needs run high. In high cost areas, needs can easily take more than half. That is not failure. Start where you are and move a little toward the target each year.

Common questions

What if my needs are more than 50%?

That is common, especially with high rent or childcare costs. Treat 50/30/20 as a direction, not a pass or fail test. You might run a 60/20/20 or 65/25/10 split for now and adjust as your income rises or a big cost ends.

Does retirement saving taken from my paycheck count?

If it comes out before your pay arrives, it is not in your take-home pay, so do not count it again here. Some people prefer to add it back to both pay and savings to see the full picture. Either way works if you stay consistent.

Where do debt payments go?

Minimum payments go in needs. Anything extra you pay to clear a balance faster goes in savings and debt. If you have high interest debt, putting more of the 20% toward it often makes sense once you have a small emergency fund.

Is this a full financial plan?

No. It is an estimate and a quick check on balance. If you are planning around irregular income, large debts, tax questions or a major change like a new baby or a move, a financial adviser or accountant can help you set a budget that fits your situation.