How much house can you afford on a $100k salary? Form MC-10
$100,000 a year is $8,333.33 a month gross. The 28% rule caps housing at $2,333.33; the 36% rule caps it at $2,500 after your $500 in monthly debts. The lower one wins: $2,333.33 a month. At the prefilled 7.03% rate that approves a $325,825 purchase with $60,000 down — seeded below, with the full monthly breakdown.
Tool № 10 · Monday, September 28, 2026 · free, always
$2,333.33 a month is the cap — the price is whatever that buys.
Input slip · Form MC-10
Two tabs, one ledger. Affordability solves your income backwards into a max purchase price; Monthly payment prices a specific house down to the dollar. Everything recalculates as you type, and everything stays in your browser — nothing is sent anywhere.
Prefilled at the Freddie Mac 30-year average for the week of Sept 24, 2026 — replace it with your actual quote.
Set to 6.5% for the worked example below (the Freddie Mac 30-year average for the week of Sept 24, 2026 was 7.03%) — replace it with your actual quote.
Posted entry · Form MC-10-R
More doors into the same ledger Form MC-10
Every angle on the mortgage, same arithmetic underneath:
- The main mortgage calculatorboth tabs, full ledger, bi-weekly comparison
- How Much House Can I Affordthe head-term page: income in, max price out
- Mortgage Payment Calculator$450k at 6.5%, line by line
- Afford on a $75K Salaryapproved up to $239,685
- Biweekly vs Monthly Mortgage625 payments, $108,503 saved
The $100k math, line by line Form MC-10
Housing cap: $2,333.33 a month — the 28% rule binds. Down payment: $60,000, which is 18.41% of the approved $325,825, so PMI applies. Loan: $265,825.07.
At 7.03% over 30 years the monthly lines post as principal and interest $1,773.90, property tax $298.67, insurance $150.00, PMI $110.76 — $2,333.33 on the nose. Every line is accounted for; nothing hides in the listing price.
Two levers move this number most: the rate you actually get quoted, and debts. Clearing the $500 in monthly debts hands the 36% rule more room — but the 28% rule still binds here, so the win is smaller than you’d hope. Type your real debts and see.
Common questions Form MC-10
What house price does a $100k income buy?
With $500 in monthly debts, $60,000 down, and a 7.03% 30-year rate: about $325,825. Change any input and the approval re-posts — the rate moves it most.
Is the 28% rule before or after tax?
Before — gross monthly income. $100,000 a year is $8,333.33 a month for the ratio, even though take-home is less. Budget the payment against take-home; the lender ratios against gross.
Do I need 20% down on a $100k salary?
No — the math works at any down payment. The seeded $60,000 is 18.41%, so PMI applies at $110.76 a month. Crossing 20% would drop PMI and nudge the approval up.
What if I have no debts?
Then the 36% back-end cap rises to $3,000 and the 28% rule still binds at $2,333.33 — same approval. Debts only matter here once they’re big enough to make the 36% rule win.
Does this include closing costs?
No — this is the monthly payment and price math. Closing costs (roughly 2–5% of the price) come out of cash at signing and don’t change the monthly number.
Is this financial advice?
No. It’s amortization arithmetic on numbers you type: it doesn’t check your credit, approve loans, or know your local tax rate. A lender’s pre-approval and your own budget have the final word.