Why 25% of net, not 28% of gross
The lender's 28/36 test uses gross income, before tax, 401(k), health premiums and childcare. On a $100,000 salary that can be a $1,400/month difference in what 'affordable' means. Ramsey's rule strips the illusion by starting from the money that actually lands in your account — the same money that has to cover food, transport and everything else.
The 15-year term is doing most of the work
The shortest-term requirement is what really limits the price. A 15-year loan carries a payment roughly 40% higher than a 30-year at the same balance, so the same 25% cap buys noticeably less house — and retires the debt before most people's kids reach college. If you take the 30-year, run the numbers here with the term set to 30 and decide with both figures in front of you.
Where the rule breaks down
In San Francisco, Seattle, Boston or New York, 25% of take-home often does not reach the entry-level price of anything. The honest read is not to abandon the rule but to name the tradeoff: rent longer and invest the gap, buy further out, or accept a higher ratio with a written plan to get back under it. Stretching to 40% with no plan is how people end up house-poor.
What the rule leaves out
HOA dues, PMI below 20% down, maintenance (budget 1% of value per year), and the utility jump from apartment to house. Add those and a payment at exactly 25% can behave like 32%. Build them into your number before you sign.
FAQ
How much house can I afford on Dave Ramsey's rule?
Take your monthly take-home pay, multiply by 0.25, and that is your entire housing payment including principal, interest, property taxes and insurance — on a 15-year fixed with 20% down. The calculator above solves backwards from that cap to a maximum purchase price.
Does Ramsey's 25% include taxes and insurance?
Yes. The cap covers the full payment: principal, interest, property taxes, homeowners insurance, HOA and PMI if any. That is why it comes out far below what a lender will approve.
Is the 15-year mortgage really better?
It costs more per month and saves a large amount of interest — typically well over $100,000 on a median-priced home. The counterargument is that the payment difference invested at market returns may beat the interest saved. Both answers are defensible; the 15-year is the lower-risk one.
What if I can't afford anything at 25%?
That is information, not failure. It means the local market is priced above your current income. The options are to wait and raise the down payment, buy in a cheaper submarket, increase income, or knowingly go above 25% with a dated plan to get back under it.
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