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Budget Calculator
Needs, wants, savings — the 50/30/20 rule sorts every dollar of take-home pay. This budget calculator applies it to your income and expenses, tracks your surplus and savings rate as you enter them — then share or export the finished household budget.
See how this works on a $6,000 take-home budget — 3 real examples
Monthly surplus
$0
Net income
$0
Total expenses
$0
Savings rate
0%
Where your money goes
Your budget vs the 50/30/20 rule
Each bucket compared against its recommended share of your net income. The marker shows the 50/30/20 target.
How your 50/30/20 budget and savings rate are worked out
Everything keys off your net (take-home) income. If you enter gross pay and a tax rate, net income is simply:
net income = monthly income × (1 − tax rate)
Every expense you enter is tagged as a need, a want, or savings. The 50/30/20 rule recommends spending 50% of net income on needs, 30% on wants, and 20% on savings, so the dollar targets are 0.50·net, 0.30·net and 0.20·net. The compliance view compares your actual bucket totals against those targets and flags each one as over, under, or on target.
Your surplus or deficit is net income minus every allocation, savings included, because a dollar you route to savings is still a dollar spoken for:
surplus = net income − (needs + wants + savings)
A positive surplus is unallocated money; a negative one is a deficit. Finally, your savings rate counts both the money you explicitly put in the savings bucket and any positive surplus, since unspent income is effectively saved:
savings rate = (savings + max(0, surplus)) ÷ net income × 100
This tool aggregates your own numbers and compares them to a well-known guideline — it does not give personalized financial advice, and the 50/30/20 split is a starting point, not a rule you must hit exactly.
A real $6,000 budget against the 50/30/20 bars
One set of monthly bills, three incomes to carry it: $6,000 take-home, a $500 pay cut, and the same net reached from gross pay.
The sample month: $6,000 after tax
monthly surplus$850
- Take-home pay of $6,000 carries $5,150 of monthly commitments and leaves $850 unspoken for.
- Needs run $3,050 — $50 over their 50% target — while wants sit $700 under theirs.
- With the $850 surplus counted, the savings rate reads 30.8%, not the 16.7% the bucket alone shows.
A budget that clears its 50/30/20 bars and still leaves money without a name.
Load this example (opens in a new tab)The same bills on $5,500
monthly surplus$350
- The same bills against $500 less income shrink the cushion from $850 to $350.
- Needs now claim 55.5% of net income, $300 past the 50% guideline.
- Nothing on the expense side changed — the targets moved because they are percentages of income.
The 50/30/20 bars measure proportion, so a pay cut can break a budget nobody touched.
Load this example (opens in a new tab)The same net, entered as gross pay
monthly surplus$850
- $7,500 of gross pay at a flat 20% tax nets the same $6,000 as the first tab.
- Every figure that follows matches that tab, down to the $850 surplus.
- The rule never sees gross pay: needs, wants and savings are all judged against take-home.
Enter gross with a tax rate or take-home with none — the budget only ever sees net.
Load this example (opens in a new tab)Illustrations only, not financial advice. Your own rate, taxes and insurance will differ — check with a qualified financial advisor before acting on any of this.
Building a monthly budget that actually sticks
- ▸Budget from take-home pay. Work with the money that actually lands in your account. If you only know your gross salary, set the tax rate so the net income matches your paycheck.
- ▸Tag every dollar needs / wants / savings. The 50/30/20 rule only works once each expense is sorted. When in doubt, ask whether skipping it for a month would cause a real problem.
- ▸Fix the big rocks first. Housing and transportation drive most needs budgets. If needs run over 50%, trimming a subscription won’t move the needle — the large fixed costs will.
- ▸Pay yourself first. Treat the savings bucket like a bill, not the leftovers. Automating retirement and emergency-fund transfers is what turns a budget planner into real progress.
- ▸Revisit it monthly. Incomes and expenses drift. Share the link to save this scenario, then reopen it next month and adjust the sliders instead of starting over.
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Frequently asked questions
What is the 50/30/20 budget rule?
The 50/30/20 rule splits your after-tax (take-home) income into three buckets: 50% for needs, 30% for wants, and 20% for savings and debt payoff beyond the minimums. On a $6,000 monthly take-home budget that is $3,000 for needs, $1,800 for wants, and $1,200 for savings. It is a starting guideline, not a hard limit — this calculator shows how far your actual budget sits from each target.
How do I make a monthly budget?
Start with your monthly take-home income, then list every recurring expense and tag it as a need, a want, or savings. Add them up and subtract from income: a positive number is your surplus, a negative one is a deficit you need to close. This household budget planner does the math live as you drag each slider, so you can test changes before you commit to them.
What percentage of my income should go to housing?
A common guideline is to keep housing — rent or mortgage plus property tax and insurance — at or below about 30% of gross income (roughly 35% of take-home). Housing is the largest slice of most needs budgets, so if your needs bucket is running over 50%, housing is usually the first place to look.
What counts as a need versus a want?
A need is an expense you cannot easily skip without real consequences: housing, utilities, groceries, basic transportation, insurance, minimum debt payments, and healthcare. A want is discretionary — dining out, streaming, shopping, travel, and hobbies. The line is personal, so this calculator lets you see the needs/wants/savings split and re-tag spending in your head as you review it.
How much of my income should I save each month?
The 50/30/20 rule targets 20% of take-home income for savings, which includes retirement contributions, investments, and building an emergency fund. Your savings rate here counts both money you explicitly route to savings and any leftover surplus, since unspent income is effectively saved. Even 10% is a solid start if 20% is out of reach right now.
What should I do if my expenses exceed my income?
If the result shows a monthly deficit, your budget is spending more than it takes in. Trim the wants bucket first, then look for oversized needs like housing or transportation, and pause non-essential savings transfers until the budget balances. Closing the gap even by a small amount each month stops the shortfall from turning into new debt.
Disclaimer: these calculators are educational tools, not financial advice. They model your inputs with published formulas, but they cannot know your full situation — for decisions with real stakes, talk to a qualified professional. Formulas and defaults last reviewed .