Free Online Budget Planner (50/30/20 Rule)

What the budget planner shows

This budget planner shows where your monthly income goes and how much of it is left to save. You enter your income after tax and a list of monthly costs, and mark each line as a need, a want or savings. The planner adds up the three groups, compares them with a target split such as the well-known 50/30/20 rule, and gives you one headline number straight away: how much you can put aside each month or, when spending is higher than income, your monthly shortfall.

A household budget rarely breaks because of one large cost. It leaks through dozens of small ones: takeaway, subscriptions, coffee, the extra items in the supermarket trolley. Once everything is written down and sorted into three groups, you can see whether housing really takes half your income, how much goes on fun, and whether anything is left for an emergency fund and investing. Without that picture, advice such as "save 20%" stays abstract.

The planner does not connect to your bank or read statements: you type in your own amounts. That is slower than automatic tracking, but writing the list by hand makes you think about each line. Everything runs in your browser, and nothing you enter is sent anywhere.

In this guide:

• How to fill in the income, the split and the spending lines, and how to read the results
• Where the 50/30/20 rule comes from and how it is calculated
• What counts as a need, a want and savings
• How to choose a split when housing is expensive or income is irregular
• Where loan payments go and what to do when spending is above income
• Three worked examples, a table of targets and common mistakes

A budget is the first step toward any money goal. If you do not yet have a cushion for unexpected costs, start with the basics article on the emergency fund: that is where your first surplus should go.

How to use the budget planner

The planner opens with an example you can rework into your own budget: an income of $5,000, the 50/30/20 split and six lines. The currency starts as the US dollar; the examples in this guide use USD or switch to EUR. The UAH / USD / EUR switch sits in the header of the Your numbers panel, or under More options on phones and tablets. Only the symbol and formatting change; nothing is converted.

Income and target split

The first field is Monthly income after tax: what actually reaches your account each month. The slider goes up to 10,000 in dollars or euros (200,000 in hryvnias), but you can type a larger amount into the box. On phones the slider is replaced by − and + buttons.

Below it is Target split with four buttons: 50/30/20, 60/20/20, 70/20/10 and Custom. The numbers are the shares of income for needs, wants and savings. Custom opens two fields, Needs, % of income and Wants, % of income. Savings is worked out as whatever is left of 100%, and the hint under the second field shows it, for example "Savings: 20% of income". Wants cannot exceed what needs leave: if needs are 70%, the wants field goes up to 30%. Your custom percentages are kept when you switch to a preset and back.

Spending lines

The Monthly spending block is a list of lines. Each line has three fields: What for (a name such as "Rent"), Amount a month and Category, which is Needs, Wants or Savings. The starting lines are:

Add a line adds an empty line in the Needs category; the cross on the right removes a line. You can have from one to 30 lines. A name is optional: a line without one appears as "Line 3" and so on in the table and the PDF. Enter everything as a monthly amount: divide a yearly insurance premium or car service by 12.

Reading the results

The headline is Available to save each month: income minus needs and wants. When needs and wants together are higher than the income, it becomes Monthly shortfall, with a warning that names the missing amount.

Under the headline is a three-colour bar of needs, wants and savings that together make up the income. Then come the figures:

• Savings rate, the amount available to save as a share of income, with a hint such as "target 20%";
• Needs, share of income and Wants, share of income, each next to its target;
• Not yet planned, the income left after all lines, savings lines included; it appears only when it is not zero.

Percentages show up to two decimals. The Chart tab draws three horizontal bars: your budget in the group's colour, the target as a dotted outline. The Monthly spending tab is a table of every line with its category, amount and share of income, with totals for each group and an overall total at the bottom.

Pin to compare keeps the current budget. When you change the amounts, the headline shows the difference, such as "+$200 vs pinned", the chart adds a dashed outline for the pinned budget, and a caption sums it up: "Pinned scenario: $4,800: 50/30/20 → $1,200". Changing the split keeps the pin; switching the currency, Reset or a reload clears it. PDF saves the income, the split, the summary, each group against its target, the table of lines and the notes. On phones and tablets the results sit in a bar at the bottom of the screen; Details opens the rest.

The 50/30/20 rule explained

The 50/30/20 rule was set out by Elizabeth Warren and her daughter Amelia Warren Tyagi in All Your Worth: The Ultimate Lifetime Money Plan, published by Free Press in 2005. The book calls it the Balanced Money Formula: 50% for Must-Haves, 30% for Wants and 20% for Savings. Every share is measured against income after tax: the book's first worksheet is the after-tax income, and each score is divided by it.

The idea is simple. Instead of tracking every dollar in twenty categories, you watch three. If the costs you cannot avoid fit into half of your income, there is room both for living now and for the future. If they do not, the budget is fragile: any drop in income hits housing and food at once.

Needs target          = Income × needs share ÷ 100
Wants target          = Income × wants share ÷ 100
Savings target        = Income × savings share ÷ 100
Available to save     = Income − Needs − Wants
Savings rate          = Available to save ÷ Income × 100
Not yet planned       = Income − Needs − Wants − Savings lines

• Income is your monthly income after tax;
• Needs and Wants are the sums of the lines in those categories;
• the shares are the percentages of the chosen split, which add up to 100.

Note that the amount available to save is not the sum of your savings lines: it is whatever needs and wants leave over. Savings lines only show how you plan to use that money, such as how much goes to the emergency fund and how much to investing. If they add up to more than what is left, a warning says your lines exceed your income. If they add up to less, the difference shows as Not yet planned: money that has no job yet and tends to dissolve into small purchases.

Why these shares

Half of income for needs leaves a safety margin. If income falls by a third for a while, the costs you cannot avoid still fit into what remains, even if wants and savings have to pause. When needs take 80% or 90% of income, any lost pay cheque or surprise bill leads straight to debt.

30% for wants is a deliberate permission to live now. A budget with no room for eating out, trips or gifts rarely lasts more than a few months: people give up and stop tracking. A separate share for wants makes that spending planned rather than guilty.

20% for savings is enough to build a cushion, clear debts and start investing within a few years, without demanding a life of austerity. Anyone who saves a fifth of their income puts aside almost two and a half months of income every year.

Needs, wants and savings: what goes where

The hardest part of any budget is sorting costs into the three groups honestly. A useful test: would you still pay for this if your income suddenly halved? If yes, it is a need. If it would be the first thing to go, it is a want.

Needs are housing (rent or mortgage), utilities, basic groceries, getting to work, phone and internet, medicine, required insurance, childcare and school costs, the minimum payment on every loan, and child support. They are what you would still have to pay if everything else were cut.

Wants are eating out and takeaway, entertainment, travel, clothes beyond the basics, gadgets, streaming and other subscriptions, the gym, gifts and hobbies. They are not "bad" costs: they are what makes life pleasant. The budget simply shows what they cost.

Savings are contributions to an emergency fund, a savings account, an investment or retirement account, extra payments on a loan, and money set aside for a planned large purchase.

Some costs belong half in each group. A basic grocery basket is a need; treats and ready meals are a want. The cheapest phone plan is a need; a premium one is partly a want. A car you need to get to work is a need; a pricier car than the job requires is partly a want. To keep it clear, you can enter one cost as two lines: "Groceries, basics" under needs and "Groceries, extras" under wants.

Choosing your split

50/30/20 is a guide, not a law. It works well when housing takes no more than about a third of income. If you rent in a big city or carry a large mortgage, needs can easily reach 60% or 70%. A 50% target then only discourages you, and it is better to start with a more realistic split.

60/20/20 and 70/20/10 are buttons in the planner; anything else goes through Custom. For example, if your needs steadily take 55% and you want to keep saving 20%, enter 55 in Needs, % of income and 25 in Wants, % of income. The hint shows "Savings: 20% of income", and on an income of €5,500 the targets become €3,025, €1,375 and €1,100. The target then reflects your life rather than someone else's template, and the gaps against it actually mean something.

A good approach is to pick a split close to where you are now and then move it a point or two toward savings every quarter. A pay rise is the best moment: if at least half of the increase goes into savings, your savings rate climbs without feeling like a loss.

The higher the savings rate, the sooner your money starts working for you. How the difference between 10% and 20% turns into years through compounding is explained in the article on compound interest and the time value of money.

Budgeting with an irregular income

The 50/30/20 rule was built for a salary that arrives every month in the same amount. Freelancers, contractors, the self-employed and anyone paid by commission or bonus have it harder: one month brings $4,200, another $2,200. The average misleads, because costs do not wait for a good month.

A simple method:

1. List your income for the last 12 months and find the lowest normal month, leaving out one-off disasters.
2. Build the budget in the planner on that amount: your needs must fit into it with room to spare.
3. In better months, put everything above that base into a smoothing buffer that tops up the weak months.
4. Once the buffer covers two or three weak months, share the extra between wants and goals.

For example, a freelancer whose monthly income over a year ranged from $2,200 to $4,200 averaged $3,166.67. A budget built on $3,166.67 runs almost $1,000 short in the weakest month. A budget built on $2,200 balances every month, and whatever comes in above it fills the buffer and the goals.

With an irregular income your emergency fund should also be larger than an employee's, because a weak spell can last longer. The emergency fund calculator helps you work out how large.

Where debt payments go

Loans are what most often confuse a budget. The rule is simple: the minimum or scheduled payment is a need. You cannot skip it without fees, penalty interest and damage to your credit history, so it is as unavoidable as rent.

Anything you pay on top of the schedule to clear the debt sooner is savings. An extra payment reduces what you owe just as a deposit increases what you own: your net worth rises by the same amount. All Your Worth also adds extra debt payments to savings.

Credit cards and instalment plans with fees deserve special attention. If a debt costs 25% or more a year once every fee is counted, no ordinary investment reliably earns that much, so it usually pays to clear that debt first. The APR calculator works out the real yearly cost of a loan with every fee included.

What to do with the surplus

When the headline is positive, the planner shows a Put the surplus to work block with two links that carry your amount: "Build an emergency fund with … a month" and "Plan an investment goal with … a month". That is a sensible order:

1. Emergency fund. A cushion of three to six months of essential spending protects you against job loss, illness or an urgent repair. Keep it where you can reach it quickly. Whether a bank deposit is worth it after tax and inflation is covered in should you keep money on deposit.
2. Expensive debt. Credit cards and consumer loans with a high rate are best cleared before you invest.
3. Long-term goals. Retirement, children's education, a home. Here the money needs to work: what investing is and how to get started explains the first steps, and the investment goal calculator shows how much to put aside each month to reach a given sum.

A surplus with no job usually just gets spent. So turn it into savings lines: Not yet planned then moves toward zero and every dollar has a purpose. Better still, set up an automatic transfer on payday, so you save first rather than whatever is left at the end of the month.

How long the emergency fund takes

Simple arithmetic shows whether the goal is realistic. In the first worked example below, needs come to $2,700 a month, so a three-month cushion is $8,100. Saving the whole $1,200 surplus each month, it takes about seven months; saving $600, a little under fourteen. That is why the cushion is usually based on essential spending rather than on the whole income: in a bad month, wants can stop.

When spending is higher than income

When needs and wants together exceed your income, the planner shows a Monthly shortfall and a warning with the missing amount. The bar then holds only needs and wants, and the savings rate turns negative. That is not a verdict, just the exact amount you need to find.

What to do:

• Start with wants. They are the easiest to cut, and the effect is immediate. Pin the current budget and lower the want lines: the difference next to the headline shows how much you have found.
• Review the needs you can change. Phone and internet plans, insurance, how you get to work. Some changes take time, such as cheaper housing at the next move, but they are worth planning.
• Look for extra income. Sometimes cuts alone cannot balance a budget, especially when inflation pushes prices up faster than pay. Why that happens is explained in the article on inflation and why money loses value.
• Do not borrow to fill the gap. Covering the difference with a credit card every month raises next month's needs by the interest.

There is a second kind of problem: needs and wants fit into the income, but the savings lines add up to more than what is left. Then a warning says your lines exceed your income, and Not yet planned turns negative. That is a plan that cannot be carried out: lower the savings lines to what is actually left, or trim spending.

Budget at a glance

The table shows the 50/30/20 targets for a few levels of after-tax income. It is not a recommendation of how much to spend, only a benchmark to hold your own numbers against.

On a lower income the 50% target for needs is the hardest to meet, because rent and food do not shrink with pay. At $3,000 a 60/20/20 split gives targets of $1,800, $600 and $600, and 70/20/10 gives $2,100 for needs and $300 for savings. What matters most is that savings are not zero: even 5% of income each month adds up to a noticeable cushion over a few years.

Worked examples

Common mistakes

• Using income before tax. The rule works from take-home pay. A budget built on the gross figure shows money that never reaches your account.
• Forgetting irregular costs. Insurance, car servicing, holiday gifts, school trips, repairs. Divide the yearly amount by 12 and add it as a line.
• Putting all groceries or the whole car under needs. Wants then look modest and needs look impossible. Split the basics from the extras.
• Confusing savings lines with the surplus. The amount available to save is what needs and wants leave. Savings lines are the plan for it, and the plan cannot be larger than the surplus.
• Leaving money unplanned. Money without a job gets spent without anyone noticing. Give every dollar a purpose.
• Setting an impossible target. A split you cannot meet quickly makes you give up on budgeting. Start with 70/20/10 or a custom split and move gradually.
• Making a budget once. Prices, income and costs change. Review the budget at least once a quarter and after every big change: a move, a new job, a new baby.
• Ignoring small regular costs. $5 of coffee every working day is around $100 a month. What that habit could grow into if invested is what the coffee vs investing calculator shows.

Limitations and next steps

The planner is a simple monthly tool, and on purpose it leaves a lot out:

• No tracking. It does not connect to your bank or collect what you actually spend; you enter planned or average amounts yourself.
• One month. Seasonal costs, bonuses and irregular income have to be turned into a monthly amount by you.
• No tax. Income goes in after tax; the planner deducts nothing and knows no tax rules.
• No inflation or interest. Amounts are not indexed, and savings do not grow over time. How regular contributions grow over the years is what the compound interest calculator shows.
• One currency. All amounts are in the currency you choose, and nothing is converted. If part of your income comes in another currency, convert it at the current rate yourself.
• The shares are a guide. 50/30/20 and the other splits are rules of thumb, not personal financial advice.

Next steps: balance the budget so the headline is positive; build your cushion with the emergency fund calculator; clear expensive debt; and turn the monthly surplus into an investment plan with the investment goal calculator. To see what share of your income a single cost takes, use the percentage calculator. Review the budget every quarter: a small quarterly shift toward savings changes your finances more over a few years than any one-off saving.