Six figures changes the mortgage conversation, but not as much as most people expect. If you are asking what mortgage can i afford on 100k salary, the lending industry's standard 28/36 rule puts the answer at roughly a $314,000 to $369,000 loan on a 30-year mortgage at 6.5%, depending on whether taxes and insurance are counted inside the budget (they should be). Asked another way, what mortgage can i afford with 100k salary comes down to one monthly number: $2,333 for all housing costs. Here is the exact math.
The 28/36 rule, step by step
Lenders use two ratios:
- Front-end (28%): Housing costs at or below 28% of gross monthly income
- Back-end (36%): All monthly debts at or below 36% of gross monthly income
On $100,000 a year ($8,333 a month):
- Front-end limit: $8,333 x 0.28 = $2,333 a month for housing
- Back-end limit: $8,333 x 0.36 = $3,000 a month for everything
With no other debts, the front-end number binds: $2,333 is your total housing budget, including principal, interest, taxes, insurance and PMI. Run your own version with our mortgage calculator and check the price side with our home affordability calculator.
From $2,333 a month to a loan amount
At 6.5% on a 30-year loan, $2,333 a month in principal and interest alone supports a loan of about $369,000. But that $2,333 must also cover property taxes and insurance, which lenders count as housing. After roughly $350 a month for taxes and insurance, the principal-and-interest budget is closer to $1,983, supporting a loan of about $314,000. That gap is why two calculators can give you two different answers on the same salary: one ignores taxes and insurance, the other does not. Trust the lower one.
With 20% down, the $314,000 loan buys roughly a $392,000 home. With 10% down it buys roughly a $349,000 home, and with an FHA 3.5% down payment roughly a $325,000 home, before PMI.
What a $350,000 home actually costs a month
The same house costs very different amounts depending on your down payment, because PMI and the loan size both move:
| Down payment | Loan | Principal + interest | Taxes + insurance | PMI (estimate) | Total a month |
|---|---|---|---|---|---|
| FHA 3.5% ($12,250) | $337,750 | $2,134.81 | $350 | $154.80 | $2,639.61 |
| 10% ($35,000) | $315,000 | $1,991.01 | $350 | $131.25 | $2,472.26 |
| 20% ($70,000) | $280,000 | $1,769.79 | $350 | $0 | $2,119.79 |
Two lessons here. First, only the 20% down version fits inside the $2,333 guideline. Second, PMI is not a footnote: on the FHA version it adds about $155 a month until you refinance or reach 20% equity. Learn how to drop it in our guide to what PMI is and how to avoid it.
Debts shrink the number fast
The back-end ratio is where real buyers lose borrowing power. With debts, the lender uses whichever limit is lower:
| Monthly debts | Back-end housing cap (36% minus debts) | Loan it supports at 6.5%, 30 years, after ~$350 tax and insurance |
|---|---|---|
| $0 | $3,000 (front-end $2,333 binds) | ~$314,000 |
| $800 (car + cards) | $2,200 | ~$293,000 |
| $1,500 (car + student loans) | $1,500 | ~$182,000 |
On an apples-to-apples basis, $800 a month in debts cuts roughly $21,000 off your loan versus no debts, and $1,500 a month cuts roughly $132,000. Paying off a car before you buy is often worth more than a year of extra saving. Check your own ratio with our debt-to-income calculator.
Paid biweekly? Your per-paycheck housing budget
Most $100K earners are paid every two weeks: $100,000 / 26 = $3,846.15 per paycheck (gross), so the 28% housing budget is $1,076.92 per paycheck. Twice a year you get a third paycheck in the same month. On a $280,000 loan at 6.5%, adding $200 a month pays it off in 273 months instead of 360 and saves about $101,284 in interest.
Should you borrow the max?
$2,333 a month is the ceiling, not the target. On $100K gross, take-home is roughly $6,500 a month after federal tax and FICA, before state tax, so a maxed-out payment leaves about $4,200 for everything else. Buying 10 to 15% under your max is the sweet spot between building equity and sleeping well. For the price view, see how much house you can afford on a $100K salary.
FAQ
What mortgage can I afford on $100K a year?
Roughly a $314,000 to $369,000 loan on a 30-year mortgage at 6.5%, per the 28/36 rule. The lower end counts taxes and insurance inside the $2,333 monthly budget; the higher end is principal and interest only.
How much mortgage payment can I afford on $100K salary?
Up to $2,333 a month for all housing costs. A $350,000 home with 20% down costs about $2,120 a month, which fits; with 3.5% down it costs about $2,640, which does not.
Can I afford a $400K house on a $100K salary?
It is a stretch. With 20% down, a $400,000 home costs about $2,422 a month including taxes and insurance, over the $2,333 guideline. You would need roughly a $104,000 salary to fit it comfortably at 6.5%.
How much mortgage can I afford on $100K salary with debts?
With $800 a month in debts, the cap is $2,200 a month and your realistic loan falls to roughly $293,000 after taxes and insurance. With $1,500 a month in debts, the cap is $1,500 and the loan falls to roughly $182,000.
What is a good down payment on a $100K salary?
20% ($65,000 to $78,000 on a $325,000 to $392,000 home) avoids PMI entirely and is achievable in 2 to 3 years of focused saving at this income. 10% works too, with PMI of roughly $125 to $155 a month until you reach 20% equity.
Does a $100K salary guarantee mortgage approval?
No. The 28/36 math sets the ceiling, but approval also depends on credit score, employment history, down payment source and the appraisal.
Estimates for planning only, not financial advice. Actual approval depends on your lender.