Determining how much house you can afford involves assessing your gross income, recurring monthly consumer debts, cash down payment, and prevailing mortgage interest rates. Lenders evaluate loan applications using Debt-to-Income (DTI) ceilings—specifically comparing front-end housing expense limits against back-end total monthly debt allowances.

This calculator determines your theoretical maximum mortgage loan amount under standard conventional underwriting rules and benchmarks a recommended conservative purchasing target that preserves financial flexibility for routine repairs, property tax reassessments, and emergency savings.

### Worked Numeric Example A buyer earning an **$85,000 annual gross salary** ($7,083.33/month) with **$40,000 in down payment funds** and **$500/month in recurring monthly debts** evaluates home affordability under a **30-year fixed loan at 6.80% interest**: 1. **Front-End 28% Maximum:** Monthly housing P&I payment ceiling = $7,083.33 × 0.28 = **$1,983.33/month**. 2. **Back-End 43% Maximum:** Total allowable debt = $7,083.33 × 0.43 = $3,045.83/month. Subtracting $500 monthly debts leaves **$2,545.83/month** for housing. 3. **Binding Limit:** The front-end 28% limit of $1,983.33/month binds the borrowing calculation. 4. **Maximum Borrowing & Purchase Price:** A $1,983.33 monthly payment supports a **$304,227 maximum mortgage loan**. Adding the $40,000 down payment results in a **$344,227 maximum home purchase price** (generating a 35.1% total back-end DTI). 5. **Recommended Conservative Target (85%):** Targeting **$292,593** provides an essential safety cushion for homeowners insurance, utility bills, and unexpected maintenance.

### Client-Side Privacy Note All mortgage affordability simulations, DTI calculations, and loan limits execute locally inside your browser runtime. Zero income figures, down payment amounts, or credit parameters are transmitted across external network requests.