How Much a US Lender Lets You Borrow: DTI at 36% vs 43%
Published 2 August 2026
US lenders decide how much you can borrow mainly through your debt-to-income ratio, the share of your gross monthly income that goes to debt payments, rather than your salary on its own. The old 28/36 rule says housing should stay under 28% of income and total debt under 36%, yet most loans now stretch well beyond that. On a $90,000 income with $500 of existing monthly debt, a 36% back-end limit supports a home loan of about $277,000, while a 43% limit lifts that to roughly $360,000, and the strongest files reach 50% and around $443,000. The ratio, not the income figure alone, is usually what sets the ceiling.
What is the debt-to-income ratio (the 28/36 rule)?
Your DTI comes in two parts, and lenders check both. The front-end ratio measures only your housing payment, meaning principal, interest, property taxes, insurance, and any HOA dues, against your gross monthly income, and the classic guideline keeps it under 28%. The back-end ratio adds every other monthly obligation on your credit report, such as car loans, student loans, and minimum credit-card payments, and the guideline keeps that under 36%. Conventional underwriting leans on the back-end number, so that is the one that usually decides your limit, though the 28/36 pairing is a guideline rather than a law.
How much can you borrow at 36% vs 43% DTI?
Take a $90,000 salary, which is $7,500 a month, with $500 of existing debt and about $450 a month set aside for taxes and insurance, priced at a 6.5% rate over 30 years. A 36% back-end limit allows $2,700 of total debt, and after the existing $500 and the $450 of taxes and insurance you have roughly $1,750 for principal and interest, which supports a loan near $277,000. Raise the limit to 43% and the total-debt budget climbs to $3,225, leaving about $2,275 for principal and interest and a loan near $360,000. That single step from 36% to 43% adds about $83,000 of borrowing power on the same income, which is why the ratio matters so much.
How do lenders stretch past 43% to 50%?
The higher ratios open up through what lenders call compensating factors, and the automated underwriting systems reward them. A credit score above 720, several months of mortgage payments held in reserve, or a low loan-to-value can all push an approval higher, with Fannie Mae and Freddie Mac systems commonly reaching about 45% and stretching toward 50%. FHA pairs a 43% guideline with room to roughly 50% or more through automated underwriting, while VA loans skip a hard cap and test residual income, the dollars left after every bill. The Consumer Financial Protection Bureau replaced the strict 43% Qualified Mortgage limit in 2021 with a price-based test, but lenders still have to prove you can repay.
What counts in your DTI?
The back-end ratio sweeps in more than people expect, so it pays to know the list before you apply. Lenders include the proposed housing payment plus HOA dues, car loans, student loans, minimum credit-card payments, and personal loans, and for student loans in deferment many still estimate a payment of about 0.5% to 1% of the balance even when you owe nothing this month. They leave out utilities, groceries, insurance premiums, and retirement contributions. The debt-to-income calculator adds these up and shows both your front-end and back-end ratios.
How to borrow more without earning more
Because the ratio drives the limit, trimming monthly debt lifts your borrowing power quickly, often faster than a raise would. Paying down a card balance or clearing a car loan frees room in the back-end ratio straight away, and lowering your credit-card limits can help too. A larger down payment cuts both the loan and the payment, which eases the front-end ratio, and buying down the rate lowers the principal-and-interest figure the lender counts. Model the effect in the affordability calculator before you shop.
A note on the figures
The example uses a $90,000 income, $500 of other monthly debt, about $450 a month for taxes and insurance, and a 6.5% rate over 30 years, which reflects the US market in mid-2026. Real limits, rates, and escrow costs vary by loan type, lender overlay, and location, so treat the numbers as a guide rather than a quote. For the underlying rules see the Consumer Financial Protection Bureau, and confirm your own position with a licensed loan officer.