“How much house can I afford?” That’s the first question prospective homebuyers should ask themselves.
While you may have an idea of how much of a monthly mortgage payment is, mortgage lenders have a formula they use: the 28/36 rule.
What Is the 28/36 rule?
This rule of thumb dictates that you spend no more than 28 percent of your gross monthly income on housing costs, and no more than 36 percent on all of your debt combined, including those housing costs. Housing costs encompass what you may hear called by the acronym PITI: principal, interest, taxes and insurance. These are the main components of a homeowner’s monthly mortgage payment.- Front-end ratio (28 percent): The maximum percentage of gross monthly income you should spend on housing.
- Back-end ratio (36 percent): The maximum percentage of gross monthly income you should spend on all of your debt, including housing. This is also known as your DTI, or debt-to-income ratio.
Example: The 28/36 rule for a $500,000 Home Purchase
- Say you’re buying a home priced at $500,000 with a 20 percent down payment, and you’re getting a 30-year, fixed-rate mortgage at 6.5 percent. With those figures, your monthly principal and interest payments would come to $2,528, according to Bankrate’s mortgage calculator.
- Add another $400 or so to cover the cost of your property taxes and homeowners insurance premium, both of which will vary depending on where you live, and your housing costs for the month would total $2,928.
- To stay within the 28 percent threshold, you’d need to bring in at least $10,458 per month, or about $125,500 per year, to afford the $500,000 home. (Keep in mind that this does not include the upfront expenses of a down payment and closing costs.) To keep all of your debt to no more than 36 percent, you’d be limited to spending $3,765 in total per month.
Applying the 28/36 Rule in Today’s High-priced Market
With the current market’s record-setting home prices and high mortgage rates, is it really realistic to limit your housing spend to just 28 percent of your income?Another thing to consider is that the rule does not account for the recent inflation of costs for other goods and services. For example, say you have two children under the age of 4 that need full-time childcare. That cost alone could rival your mortgage payment. The 28/36 rule doesn’t account for this, so you’ll need to factor it in at least temporarily. Similarly, the rule doesn’t account for typical fluctuating expenses like groceries and transportation, which if you have a larger household, you’ll need to pay for.
How to Improve Your DTI Ratio
If your debt and income don’t fit within the 28/36 rule, there are steps you can take to improve your ratios, though it might require some patience. Start by paying down debt. Not only will this help your DTI ratio, but it could boost your credit score, too. You can also take steps to grow your income over the next year or two. While that may not be what you want to hear if you want to buy a home now, it’s better than getting in over your head with a worse interest rate.If time isn’t your friend, consider whether you could settle for a less expensive home or a more affordable location. Look into condos or townhouses in your desired area, which can make you a homeowner for considerably less than the price of a single-family home. Just keep in mind that these can come with large HOA fees, and may not appreciate as much as a single family home.
Frequently Asked Questions
- How much house can I afford with a $150,000 salary? Applying the 28/36 rule to an annual salary of $150,000, you should spend no more than $3,500 per month on housing. Your credit score, type of mortgage loan, interest rate and location will all play a factor in how much your monthly mortgage payments will be.
- Is the 28/36 rule before or after taxes? The 28/36 rule is based on gross income, so that’s before taxes.
- Should I spend more than 36 percent? The 36 number is a guideline, not a law—many lenders allow a higher DTI ratio. However, before you commit to a bigger loan or spending more, ask yourself: How does paying more for my mortgage impact my ability to achieve other financial goals? This might mean fixing up the house you intend to buy, saving for retirement, paying tuition or investing. Consider how your mortgage payment affects your monthly budget, too: Will you have enough left over to cover the remaining essentials? Lastly, take into account how much more you’d be spending on interest with a larger loan amount. This might not matter as much if you don’t plan to stay in the home very long, but if you’re in it for the next 30 years, it adds up to a significant cost.
Key Takeaways
- The 28/36 rule is a rule of thumb banks use to gauge how much house you can afford. Basically, it says you shouldn’t spend more than 28 percent of your gross income on your mortgage payment.
- Buying too much house can leave you strapped for cash and can put you in a financially unstable situation if an emergency happens or your income declines.
- One blindspot of the 28/36 rule is that it doesn’t account for everyday expenses, like childcare, groceries, healthcare, and transportation.







