What is my 50/30/20 budget on my real take home pay?

Every 50/30/20 calculator asks the same first question, and almost all of them ask it badly: what is your monthly take home pay? Most people do not know to the dollar, so they type something near their salary divided by twelve. At $100,000 filing single in california that would be $8,333.33 a month. The real figure is $6,153.25, because $26,161 of tax and $0 of pre-tax deductions come out first.

Run the same three shares off each of those and the plans are not close. Needs at half of gross is $4,167 a month. Needs at half of what you keep is $3,077. The gap is $1,090 a month, and it lands on the one line you cannot reverse quickly, because rent is a twelve month decision made once. Across the whole plan the overstatement is $2,180 a month: the tax and the pre-tax money that was never yours to allocate.

Put the other way round, half of gross pay is 67.7% of what actually reaches your account. That is the number a budget cut from the wrong base quietly commits you to. This page runs a real Form 1040 for the federal half, the real Social Security and Medicare computation, and a real resident state return, from the same engine module behind the take home pay calculator, and only then divides. If you already know your net exactly, there is a field for it, and while it is filled in nothing is computed at all: the page divides your own number three ways, says so in the warnings, and ignores the filing status, the state and the pre-tax fields.

The split comes from Elizabeth Warren and Amelia Warren Tyagi, All Your Worth: The Ultimate Lifetime Money Plan (Free Press, 2005). Their balanced money formula is 50 percent of after-tax income to must-haves, 30 percent to wants, 20 percent to savings. Read the numbers as a target somebody chose rather than a measurement of anybody: they are round because they are meant to be remembered, and the calculator lets you change all three and applies them exactly as typed.

Needs, $3,077 a month here, is the bucket people get wrong. It is what you would still have to pay if your income stopped this week: housing, utilities, groceries, insurance, getting to work, childcare, and the minimum payment on every debt. Not the extra payment, only the minimum. Wants, $1,846, is everything you would cancel: eating out, subscriptions, travel, the upgrade rather than the item. The test is not whether it is enjoyable, it is whether stopping it would cost you your home or your job.

Savings, $1,231, covers the emergency fund, retirement, any goal you are funding, and every dollar of debt payment above the minimum. Paying down a balance and building one are the same act from opposite ends, which is why they share a bucket. On your own pay schedule that is $567.99 out of each of 26 checks, which is the number to automate, because a share you have to decide on every month is a share you will not make.

The rule is a ratio, so nothing about it changes by state. What changes is the money it is a ratio of. Every cell below is the monthly needs budget, computed by running a full federal return, the real payroll computation and a real resident state return at that salary and then taking 50% of what is left. Filing status and deductions are held fixed at single; only the salary and the state move.

At $100,000 the needs budget is $3,287 a month with no state wage tax, $3,159 in Pennsylvania and $3,077 in California. That spread of $211 a month is a different apartment, from the same salary, on the same rule. It is also why a national rent-affordability figure quoted as a share of income is worth very little to you specifically.

Read down a column rather than across a row and the order changes. At $50,000 the California needs budget is $1,719 a month, the largest of the four states, and by $100,000 it is $3,077, the smallest. Pennsylvania runs the other way: a flat rate charges the same share of the first dollar as the last, which makes it the gentlest of the four from $75,000 up and leaves it behind California at the bottom of the ladder. A graduated schedule that starts gently keeps climbing, so which state is kind to you depends on where you stand on it.

Four states are offered because those are the four whose resident return this engine computes as final for a wage earner. Anywhere else, the federal and payroll halves of the answer are still yours and the state line is not, so the page does not pretend otherwise. A calculator that prices all fifty states from a bracket table will be a few dollars off in every one of them, and will not tell you which.

The most common way this plan breaks is counting the same dollar twice. Suppose you defer $500 a month into a traditional 401(k), $6,000 across the year. Take home pay falls from $6,153.25 a month to $5,809.75, which is only $343.50 less, not $500 less, because tax was going to take $156.50 of that money anyway.

Now the shares run on the smaller number. Savings comes out at $1,162 a month, and the honest total you are putting away is $1,662: the deferral plus the share of what is left. If you had instead written the deferral into the 20 percent as well, you would have counted $500 twice and quietly given yourself that much more to spend.

Money taken out of your check before you see it is already missing from take home pay, so it cannot come out of the savings share as well. A 401(k) deferral, an HSA contribution and pre-tax premiums are all in that category. Count them once, on the way out of the paycheck, and let the savings share cover what you move after the check lands.

The monthly figures on this page are the year divided by twelve, which is the right way to size a plan and the wrong way to describe your bank account. Paid every two weeks you get 26 checks a year, not 24. Two checks is $5,679.92 and a month of pay is $6,153.25, so ten months of the year you are $473.33 behind the plan.

The money is not missing. It arrives in the other two months, as 2 extra checks worth $5,680. Almost everybody spends those, because they show up as a surplus rather than as the arithmetic catching up. The fix is to size fixed commitments on the monthly figure, hold the small monthly gap in the buffer, and assign the extra checks to the savings share before the month they land in. The pay frequency control above prices this for whichever schedule you are on, and it is the only thing on the page that changes the shape of the year without changing its total.

What you actually spend. Every figure here is a share of a computed number, not a measurement of your life. The plan says $3,077 for needs; whether your rent, insurance and groceries fit inside it is the thing to go and check, and if they do not, the ratio is what has to move, not the arithmetic.

Your employer’s withholding. Take home pay here is the tax for the whole year divided evenly across 26 checks. Withholding follows the Form W-4 you filed and the Publication 15-T tables, which are built to land close over the year rather than to match it each period, so the lines on your stub will match and the amounts can differ. Also: irregular income of any kind. A bonus, commission, overtime, freelance work, a spouse’s income, or a job that started partway through the year all break an evenly divided month, and none of them are modeled.

City and local income tax, which New York City and Yonkers charge on top of the state return. State disability and paid family leave deductions. After-tax deductions of any kind, which come out of the same check and are not in the pre-tax fields. Whether your contributions sit inside the annual limits, which this page does not check. It assumes the federal standard deduction rather than itemizing, wage income from one job, and one parameter year, 2025, rather than a history of past brackets. Debt is treated only as its minimum in needs and anything extra in savings, with no interest rates and no payoff order; that is the debt payoff calculator. None of this is budgeting advice or tax advice.

This calculator is built to be used without a browser. Every input is a query parameter on this page, and the same parameters on the JSON twin return the complete answer as a document.

GET /tools/budget.json?salary=120000&needs=55&wants=25&state=ny

The response carries inputs after parsing and clamping, result with basis, which is gross when the split was cut from a computed net and stated when the reader supplied one; take home pay for the year, the month and the pay period; pay, the entire take home pay result with each tax separately, the wages each is computed on, a measured marginal rate and the engine’s own computability verdict, or null when nothing was computed; buckets, the three shares monthly, annually and per check, plus a fourth slice when the shares do not add to 100; fromGross, the plan the same shares would have produced off gross pay and the monthly gap between them; plus drivers and sensitivity across a salary ladder and every state offered, drivers ranked by effect with a plain sentence each, assumptions that say for every field whether you supplied it and name the source when the default came from one, sources with a URL and an as-of date for each source the tool cites, which is an empty list on the calculators whose every default is an example input rather than a published figure, warnings, a disclaimer, and in tool the canonicalUrl and jsonUrl that carry only your non-default parameters. The canonical URL is the answer's permanent address; use it when you cite the number.

Parameters, all optional, in any order:

• salary ($ per year), default $100,000 per year.
• net ($ per year), default off.
• needs (%), default 50%, from Elizabeth Warren and Amelia Warren Tyagi, All Your Worth: The Ultimate Lifetime Money Plan (Free Press, 2005).
• wants (%), default 30%, from Elizabeth Warren and Amelia Warren Tyagi, All Your Worth: The Ultimate Lifetime Money Plan (Free Press, 2005).
• savings (%), default 20%, from Elizabeth Warren and Amelia Warren Tyagi, All Your Worth: The Ultimate Lifetime Money Plan (Free Press, 2005).
• retirement ($ per year), default $0 per year.
• hsa ($ per year), default $0 per year.
• health ($ per year), default $0 per year.
• status (one of single, married-joint, head-of-household), default single.
• state (one of none, ca, ny, pa, va), default ca.
• frequency (one of weekly, biweekly, semimonthly, monthly), default biweekly.

Values accept plain numbers and loose human formats such as 100k, $100,000, or 6.5%. Unknown parameters are ignored, values outside a field's range are clamped and reported in warnings, and the endpoint never fails on bad input. Responses are cacheable for a day; the defaults change when their sources publish, and tool.version changes when the method does.

• Elizabeth Warren and Amelia Warren Tyagi, All Your Worth: The Ultimate Lifetime Money Plan (Free Press, 2005), as of 2005-03-01. The book that set out the balanced money formula: half of after-tax income to needs, three tenths to wants, a fifth to savings. It is a target its authors chose, not a measurement of what anyone spends, and the three shares here are inputs you can change.
• IRS Rev. Proc. 2024-40 (2025 inflation-adjusted items), as of 2025-01-01. The federal rate tables and standard deduction for tax year 2025, as published by the IRS.
• SSA cost-of-living and wage-base determinations for 2025, as of 2024-10-25. The Social Security contribution and benefit base for 2025, which is the salary above which Social Security tax stops. The payroll module reports this notice as its own authority.
• One Big Beautiful Bill Act (P.L. 119-21), as of 2025-07-04. The statute that sets the current federal standard deduction used for 2025.
• 26 U.S.C. (Internal Revenue Code), as of 2025-01-01. The code sections the calculation implements: § 1 rates, § 63 deduction, § 3101 Social Security and Medicare, § 3101(b)(2) additional Medicare tax, § 402(g) elective deferrals, § 223 health savings accounts, § 125 cafeteria plans.

The split itself has one source, the book that proposed it, and it is an opinion rather than a rule of law: 50, 30 and 20 are round numbers chosen to be remembered. Everything under them is not an opinion. The federal rate tables and standard deduction come from the IRS revenue procedure and the statute that set them, the Social Security wage base from the annual cost of living announcement, and the state figures from real resident returns, with the engine naming the line it read the state tax from, here CA Form 540 line 64. Those are the authorities the engine reports for the computation, not citations chosen after the fact.

Carlo is a personal finance agent. It knows your accounts, debts, and goals, so instead of three shares of a modeled paycheck it can see what you actually spent last month, tell you which bucket you are over in while there is still time to do something about it, and notice the two months a year when an extra check lands. Text it the question.

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