Home Budget Calculator
Build a complete monthly homeownership budget. Enter your mortgage and income to see housing costs as a percentage of income, compare to the 50/30/20 rule, find hidden costs, stress-test your budget at different income levels, and map out your full year of cash flow.
Monthly Home Budget
Enter all monthly expenses to see your complete budget picture and whether you have a surplus or deficit.
How does your budget hold up at different income levels? The stress point is where housing costs exceed 36% of income.
| Scenario | Monthly Income | Housing % | Monthly Surplus | Status |
|---|---|---|---|---|
| Current | $7,000 | 46.1% | $675 | Stress point |
| +10% | $7,700 | 41.9% | $743 | Stress point |
| -10% | $6,300 | 51.2% | $608 | Stress point |
| -20% | $5,600 | 57.6% | $540 | Stress point |
The -20% income scenario represents a major job change, reduced hours, or one income lost in a dual-income household. If this scenario shows housing over 40% of income, your budget has limited resilience to income shocks — consider building a larger emergency fund.
How to Use This Home Budget Calculator
Enter your monthly take-home income (after tax, all household earners) and your housing costs. The calculator auto-populates typical estimates for property tax, insurance, utilities, and maintenance so you can start immediately and refine from there. It instantly shows your total housing costs, housing percentage of income, and remaining income for everything else.
Quick Calculator
Enter Monthly Take-Home Income (after-tax, all earners). Enter your Mortgage Payment (principal and interest). The remaining fields — Property Tax, Home Insurance, Utilities, Maintenance Reserve, and HOA Dues — are prefilled with typical values based on a $350,000 home. Adjust each to your actual numbers. The housing percentage indicator shows green (under 28%), yellow (28–36%), or red (over 36%).
Advanced: Full Budget & 50/30/20 Rule
Full Budget adds transportation, food, healthcare, debt, savings, and discretionary spending to show your complete picture and whether you have a monthly surplus or deficit. 50/30/20 Check evaluates your budget against the popular spending rule. Hidden Costs adds lawn care, pest control, home warranty, and appliance reserves — the expenses most buyers forget when budgeting for homeownership.
Pro: Scenarios, Optimization & Annual Cash Flow
Income Scenarios stress-tests your budget at current income, +10%, -10%, and -20% to identify your stress point. Optimization shows specific savings opportunities: insurance shopping, refinancing, contesting property taxes, and energy efficiency. 1-Year Cash Flow maps out month-by-month costs showing exactly when annual bills hit so you can plan ahead.
Home Budget Formula
Housing % of Income = Total Housing Costs ÷ Monthly Take-Home Income × 100
Lender Guidelines:
• Front-end ratio (housing only): ≤28% of gross income
• Back-end ratio (housing + all debt): ≤36–43% of gross income
50/30/20 Rule:
• Needs (housing, transport, food, healthcare, debt): ≤50%
• Wants (discretionary): ≤30%
• Savings & investments: ≥20%
Monthly Surplus = Monthly Income − All Monthly Expenses
Note: The 28% and 36% guidelines use gross (pre-tax) income, while this calculator uses take-home (after-tax) income which is more practical for actual budgeting. If your take-home income is 75% of gross, a $7,000 take-home corresponds to roughly $9,300 gross — meaning the lender 28% rule would allow up to $2,600 in housing costs on gross income, while 30% of $7,000 take-home is $2,100.
Example: Family Budget in Phoenix, AZ
The Nguyen family budgets their new $380,000 home
| Monthly Take-Home Income | $8,200 (combined) |
| Mortgage Payment | $2,450 |
| Property Tax (monthly) | $253 |
| Home Insurance | $130 |
| Utilities | $280 |
| Maintenance Reserve (1%) | $317 |
| HOA | $75 |
| Total Housing Costs | $3,505 |
| Housing % of Income | 42.7% — Over target |
| Hidden Costs (lawn, pest, warranty) | +$220/mo |
| True Housing % with Hidden | 45.4% |
The Nguyen family discovered their true housing costs — including hidden expenses — exceed 45% of take-home income, leaving little room for savings. The optimization tab showed they could save $380/month by shopping insurance ($200/yr savings), contesting their property tax assessment (11% reduction), and switching to LED lighting with a smart thermostat. After these changes, their housing costs dropped to 40% — still high but more manageable as they work toward paying down debt to increase available income.