Household budget planner

How to use this calculator

Read the full guide: PITI and escrow basics

How it works

Enter monthly take-home or gross income, tax filing status, housing and debt payments, and spending buckets (needs, wants, savings). The planner estimates tax withholding roughly, classifies spending against a 50/30/20 style framework, and charts cash flow, surplus, and how a proposed mortgage payment fits the picture.

Worked example

Example: $7,200 monthly gross, married filing jointly, housing goal $2,900/month, $650 other debt, $1,800 needs, $900 wants, $500 savings. After rough tax estimate, take-home might be near $5,600. Housing plus debt consumes a large share; the chart may show limited wants room, signaling you should test a $2,600 payment target before shopping at $2,900.

Why a lender's maximum is the wrong target

Underwriting measures your housing payment against gross income. You pay your mortgage out of take-home pay. In the example above, $7,200 gross becomes roughly $5,600 after taxes, so a $2,900 housing payment that looks like a reasonable 40 percent of gross is actually consuming 52 percent of the money that reaches your account.

A lender also cannot see childcare, tuition, medical costs, the car you will need to replace in two years, or your retirement contributions. None of those appear in the debt-to-income calculation, which is why a file can be comfortably approved and still leave a household with nothing left at the end of the month.

The point of this planner is to run the comparison the lender does not: your actual proposed payment against your actual remaining obligations, in after-tax dollars. If the result leaves no room, the answer is a lower payment target, not a tighter month.

Reading the 50/30/20 split without treating it as law

The framework allocates roughly half of take-home to needs, thirty percent to wants, and twenty percent to savings and debt payoff. It is a useful benchmark precisely because it is simple, and it is wrong for plenty of households.

In an expensive metro, housing alone can take 40 percent of take-home, and there is no version of the split that fixes that other than earning more or living somewhere cheaper. The framework still earns its place by showing you the tradeoff clearly: if needs run to 65 percent, the shortfall has to come out of wants or savings, and you should decide which rather than discovering it later.

Treat the percentages as a diagnostic. A result well outside the benchmark is not a failure, it is information about which constraint is binding.

The buffer that keeps a mortgage from becoming a crisis

New homeowners get a category of expense that renters never see. Maintenance and repairs run 1 to 2 percent of home value a year, and they do not arrive on schedule. A failed water heater is $1,500 with no notice, a roof is five figures, and an HVAC system in a hot summer is both urgent and expensive.

Two reserves matter. A general emergency fund of three to six months of expenses protects against income loss, and a separate home maintenance fund keeps house problems from eating it. If a $2,900 payment leaves nothing for either, a $2,600 payment with a funded cushion is the stronger financial position even though it buys less house.

Property tax and insurance are the other quiet pressure. Both tend to rise, and both flow through your escrow account, so a fixed-rate mortgage payment is not actually fixed. Assume your total housing cost increases a few percent a year even though your principal and interest does not.

Turning a comfortable payment into a price

Work in this order. Decide the all-in housing number you can live with from the output here. Subtract your estimated property tax, insurance, mortgage insurance, and HOA, which leaves the principal and interest you can support. Then convert that to a loan amount and price in the affordability calculator at a realistic rate.

Check the result against the DTI calculator so you know whether your comfortable number will also clear underwriting. If it does, you are in the pleasant position of shopping below your approval rather than at the top of it.

For a breakdown of what sits inside a housing payment beyond the loan, see PITI and escrow basics. The tax estimate in this planner is deliberately rough and is not a substitute for your pay stub or a tax professional.

Rerun the planner after you have a real insurance quote and the county levy, not the defaults. A few hundred dollars of escrow is enough to erase the surplus the first pass showed. If the second pass still leaves a maintenance reserve, the payment is a plan. If it only works with wants at zero, lower the housing target before you tour.

What this calculator does not include

• Tax estimate is simplified, not a full payroll or self-employment model.
• Does not track irregular bonuses, commissions, or RSU vesting timing.
• 50/30/20 is a benchmark, not a rule for every household.
• Does not link to credit reports or lender approval.
• Emergency fund targets are illustrative.

Frequently asked questions

Should I enter gross or net income?

Use the mode the tool labels. Gross mode applies a rough tax estimate; net mode assumes you already removed taxes.

Where does PMI go?

Include PMI inside your housing payment total alongside taxes and insurance.

What counts as needs vs wants?

Needs are essentials (housing, utilities, groceries, minimum debt). Wants are discretionary (dining out, subscriptions).

How much should I save each month?

Many planners aim for 10% to 20% of income including retirement, but start with an emergency fund if you are thin on cash.

Can this tell me my max home price?

It shows whether a payment fits your budget. Pair with the mortgage calculator for price from rate and down payment.

Educational tool only. Not a Loan Estimate, appraisal, tax advice, or legal opinion. Numbers are illustrative unless you enter your own verified inputs.