How Much Mortgage Can I Afford on a $100k Salary in 2026?

If you earn $100k a year, the question "how much mortgage can I afford on a $100k salary" has a clearer answer than most lenders let on. The figure depends on three things you can actually calculate: your other debts, your down payment, and the interest rate. Here is how the math works.

The 28/36 rule

Lenders size loans using the 28/36 rule:

• 28% — your monthly housing payment (mortgage principal, interest, property tax and insurance) should not exceed 28% of gross monthly income.
• 36% — your total monthly debt (housing plus car loans, student loans, credit card minimums) should not exceed 36%.

On a $100k salary, gross monthly income is about $8,333. So:

• Housing cap (28%): about $2,333 per month.
• Total debt cap (36%): about $3,000 per month.

What that buys you

A $2,333 monthly housing payment has to cover principal, interest, tax and insurance — not just the loan. Roughly 20–25% of that payment goes to tax and insurance, leaving about $1,750–1,850 for principal and interest.

At a 6.5% interest rate over 30 years, that supports a loan of roughly $280,000–$290,000. Add a down payment and you have your home price range.

Debt-to-income is the real gatekeeper

The 28% housing cap assumes you have no other debt. You probably do.

Every $400 car payment and $300 student loan payment eats into the 36% total-debt cap — and lenders apply the lower of the two limits. With $700 of other monthly debt, your housing budget drops from $2,333 to about $2,300 (because $2,300 + $700 = $3,000, the 36% ceiling).

This is why two people both earning $100k can qualify for very different loans. Paying down a car loan before applying can meaningfully raise your mortgage budget.

Down payment scenarios

Your down payment changes everything:

• 5% down: smaller cash outlay, but you will pay private mortgage insurance (PMI) and borrow more.
• 10% down: still PMI, but a smaller loan and lower monthly payment.
• 20% down: no PMI, the lowest monthly payment, and the strongest offer in a competitive market.

On a $290k loan, the difference between 5% and 20% down is roughly $40,000–$55,000 in cash up front — but it removes PMI (often $100–250/month) and shrinks the loan.

City and state differences

A $100k salary stretches very differently by location:

• Lower-cost metros (parts of the Midwest, the South): a $300k–$350k budget buys a solid family home.
• Mid-cost cities: $300k–$350k buys a modest home or a condo.
• High-cost coastal markets: the same budget may only reach a small condo, and property taxes and insurance run higher, squeezing the 28% housing cap further.

Property tax rates vary from under 0.5% to over 2% of home value annually — a difference that can swing your affordable price by tens of thousands.

Interest rate sensitivity

Rates matter as much as salary. On a $2,300 principal-and-interest budget over 30 years:

• At 5.5%: supports about a $405,000 loan.
• At 6.5%: about $364,000.
• At 7.5%: about $329,000.

A two-point rate swing changes your buying power by roughly $75,000.

Frequently asked questions

How much house can I afford on $100k? Roughly a $300,000–$360,000 home with a moderate down payment, assuming limited other debt and a ~6.5% rate. Other debt and location shift this.

What is the 28/36 rule? Housing costs should stay under 28% of gross monthly income, and total debt under 36%. Lenders use the stricter of the two.

Does a bigger down payment let me afford more? Yes — it shrinks the loan and removes PMI, lowering the monthly payment, which lets the same income support a higher home price.

How does debt-to-income affect my mortgage? Existing debts count against the 36% total cap, directly reducing how much you can borrow for housing.

Should I buy at the top of my budget? Usually no. Borrowing below your maximum leaves room for repairs, rate changes and life events.

Run your own numbers

Every situation is different. Plug your salary, debts, down payment and rate into the free Mortgage Calculator to see your exact affordable price — and try the Loan Calculator to compare monthly payments across rates and terms.