TrueAfford

Monthly Budget Calculator

Where does your housing payment actually fit?

The 50/30/20 rule splits take-home pay three ways: 50% for needs, 30% for wants, and 20% for savings or debt paydown. It's a useful gut-check most people never actually run with their real numbers. This maps your income, debts, and expenses onto it directly — using the housing payment already computed from your affordability scenario, not a guess.

Income & debts
Real-life monthly expenses

"Other" here is treated as discretionary spending (Wants) — everything else below is treated as a Need.

Housing payment

Defaults to the sustainable monthly cost from your affordability scenario. Override this if you're renting or testing a different number.

50/30/20 breakdown

Needs take 87% of take-home pay — $2,140 over the 50% target.

Needs$5,065target 50%

$2,140 over target

Wants$200target 30%

$1,555 under target

Savings / debt paydown$585target 20%

$585 under target

Frequently asked questions

How is 'Needs' calculated?

Your housing payment plus other debt payments, childcare, healthcare, groceries, and transportation. These are treated as obligatory — the things you'd struggle to cut quickly.

What counts as 'Wants'?

The 'Other' field from your real-life expenses — the closest this site's shared inputs get to discretionary spending. If you want a more precise wants figure, adjust that field on any calculator; it carries over here automatically.

Where does the housing number come from?

By default, it's the sustainable monthly payment already computed on the affordability calculators — principal, interest, tax, insurance, PMI, HOA, and maintenance, for your current scenario. You can override it directly if you're renting or testing a different figure.

Related: Home affordability calculator · Rent affordability calculator · Rent vs. buy calculator

© 2026 TrueAfford