Mortgage borrowing capacity is generally determined by a "28/36 rule," where total monthly housing costs (including taxes/insurance) shouldn't exceed 28% of your gross monthly income, and total debts (including loans/cards) should stay under 36% to 43%. A higher credit score (typically 740+) unlocks better rates, increasing, while a score below 620 may limit options.
The 3-7-3 Rule in mortgages isn't a loan type but a federal timeline from the TILA-RESPA Integrated Disclosure (TRID) rule, ensuring borrower protection by mandating disclosures within 3 business days of application, a 7-business-day wait between the initial Loan Estimate and closing, and another 3-day wait if significant changes (like APR) occur, giving borrowers time to review costs before committing to a loan.
To afford a $300,000 house, you typically need an annual income between $75,000 to $95,000 (your annual salary), depending on your financial situation, down payment, credit score, and current market conditions.
A household earning $70,000 — about $10,000 below the median U.S. salary — could comfortably afford to spend about $257,000 on a house, assuming they put 20% down on a 30-year mortgage with a 6.5% rate.
To afford a $400k mortgage, you generally need an annual income between $90,000 and $135,000, but this varies significantly; with a larger down payment and less debt, you might qualify with around $100k, while higher interest rates or no down payment could push the need closer to $130k-$160k, with lenders focusing on keeping total monthly debts (housing + other loans) under 36-43% of your gross income.
However, most lenders still require your score to be at least 600 for an insured mortgage, even with a co-signer. How long does it take to raise my score enough to buy a home? Raising your credit score enough to buy a home (typically up to at least 600–680) can take anywhere from about 3 to 12 months.
How to negotiate mortgage rates
You can typically afford an $800,000 mortgage with an annual income between $200,000 and $260,000. The amount you can borrow depends on more than just your salary, though. We'll cover those factors below. Luckily, you don't have to rely on guesswork to understand your potential monthly payments.
Those who like to move around or travel a lot might find renting a better option, while those wanting to create roots in a single location will find buying a better choice. Think about investing in a property. Buying a home can help you gain value and build equity by making home improvements.
Your credit score has a direct impact on your mortgage application, affecting your interest rate, loan approval, and overall borrowing costs. Even a slight improvement in your score can save you thousands over the life of your mortgage.
For most people, increasing a credit score by 100 points in a month isn't going to happen. But if you pay your bills on time, eliminate your consumer debt, don't run large balances on your cards and maintain a mix of both consumer and secured borrowing, an increase in your credit could happen within months.
The 2-2-2 credit rule is a guideline for building strong credit, suggesting you should have two active credit accounts (like cards or loans) for at least two years, with consistent on-time payments for those two years, often with a minimum credit limit of $2,000 per account, to demonstrate financial responsibility to lenders, especially for mortgages. It's a benchmark to show you can handle credit well over time, reducing lender risk and improving approval odds for major loans.
Lenders consider monthly housing expenses as a percentage of income and total monthly debt as a percentage of income. Both ratios are important factors in determining whether the lender will make the loan.
Ways to pay off your home loan faster
The current average mortgage rate on a conventional 30-year fixed-rate mortgage for someone with a good credit score of 700 was 6.58% as of January 2026, according to Curinos data. You generally need a credit score of at least 580 to qualify for a mortgage, and a score of 760 or higher to get the best interest rate.
Putting down 20% of the home's purchase price is a traditional down payment option. For a $400,000 home, a 20% down payment would be $80,000. This option may help you avoid private mortgage insurance (PMI) and can lead to more favorable loan terms.