The short answer
On $80,000 in annual income with $500 in monthly debts and $50,000 down, the standard 28/36 rule caps housing at $1,866.67 a month, supporting a maximum home price of about $264,905.67 at 6.5% over 30 years. That $50,000 down payment comes out to 18.9% of that price — just under 20% — which adds $125.36 a month in PMI to the payment.
Key takeaways
- $80,000 income with $500 in monthly debts and $50,000 down supports a maximum home price of $264,905.67 at 6.5% over 30 years.
- The two DTI limits — 28% of income for housing alone, 36% for housing plus all other debt — don't always agree; the calculator uses whichever caps the payment lower.
- 18.9% down (just under the 20% PMI threshold) adds $125.36/month in PMI on top of principal, interest, taxes, and insurance.
- Moving from the moderate to the aggressive scenario (28% to 32% of income) raises the max price from $264,905.67 to $296,846.54 — more house, but a thinner monthly cushion.
The 28/36 rule, and which limit actually binds
Lenders typically check two ratios at once: housing costs alone shouldn't exceed 28% of gross monthly income (the front-end ratio), and housing plus all other debt payments shouldn't exceed 36% (the back-end ratio). On $80,000 a year ($6,666.67/month) with $500 in existing monthly debt:
28% front-end limit: $6,666.67 × 0.28 = $1,866.67
36% back-end limit minus existing debt: ($6,666.67 × 0.36) − $500 = $1,900.00
Binding limit (the lower one): $1,866.67 — the front-end ratio
In this example the front-end ratio is the tighter constraint, but that flips for someone with more existing debt: a car payment or student loan large enough could push the back-end limit below the front-end one instead. The calculator always takes whichever number is smaller, since lenders enforce both simultaneously.
How close down payment sits to the PMI line
A $50,000 down payment sounds substantial, but against a $264,905.67 maximum home price, it works out to only 18.9% — just under the 20% threshold where private mortgage insurance drops off:
Down payment percentage: $50,000 ÷ $264,905.67 = 18.9%
PMI added to the monthly payment: $125.36
Because the calculator solves for the maximum price your budget supports, it can land just below common thresholds like 20% down without you asking for it. It's worth checking the down payment percentage in your results — a slightly smaller home price, or a bit more saved for closing, might clear the PMI line entirely.
Conservative, moderate, and aggressive compared
The same income and debts produce a different maximum price depending on how much of your budget you're willing to commit to housing:
| Scenario | Housing % of Income | Monthly Budget | Max Home Price |
|---|---|---|---|
| Conservative | 25% | $1,666.67 | $238,819.01 |
| Moderate | 28% | $1,866.67 | $264,905.67 |
| Aggressive | 32% | $2,133.33 | $296,846.54 |
The spread between conservative and aggressive here is about $58,000 in home price for roughly $467 a month — a meaningful trade-off between buying power today and the cushion left over for savings, repairs, and the unexpected. The moderate scenario aligns with the standard 28/36 guideline lenders most commonly use.
Related calculators
- Mortgage Calculator — run the full payment breakdown once you've settled on a specific home price.
- Down Payment Calculator — build a savings timeline toward the down payment your budget needs.
- Debt-to-Income Calculator — check your current DTI in detail before applying for a mortgage.