30% rule: How much of your income should go to your mortgage?

How much of your income should go to mortgage?

Your rent or mortgage payment likely will be your largest monthly expense, so it's crucial that you can afford it on your income. Spend too much, and you risk becoming house poor, with housing costs eating up funds needed elsewhere in your budget.

Limit your budget too tightly, though, and you could miss out on a home that fits your needs. Financial planners often suggest keeping housing under 30% of your gross monthly income, but the real answer hinges on your complete financial profile.

What is the 30% rule for housing?

The 30% rule¹ is a rule of thumb for determining whether a home is affordable. The rule says that you should spend no more than 30% of your gross monthly income on housing.

Keep in mind that gross income is different from net income. Gross income is all the money you earn, while net income is how much you take home after paying taxes and your payroll deductions. 

This rule became popular in the late 1960s when the U.S. government capped the cost of rent in public housing at 25% of the renter’s income. In 1981, that limit was raised to 30% by Congress, at which point it became a standard measure of affordability.

These rules are no longer officially in place, but the Department of Housing and Urban Development still uses them in some cases when providing affordable housing to low-income households. That’s why 30% of gross income became the standard benchmark for affordable housing.

What 30% means in dollars

To understand what 30% looks like in practice, you calculate it using your pre-tax monthly income.

If you earn a gross salary of $75,000 per year, your monthly gross income is $6,250. Multiplying $6,250 by 30% gives you a target ceiling of $1,875 per month for your total housing expenses.

Gross annual income: $75,000

Gross monthly income: $75,000 ÷ 12 = $6,250 30%

Housing budget: $6,250 × 0.30 = $1,875/month

It is important to remember that this target must cover your full monthly housing obligation, not just the principal and interest on the loan. It also needs to include property taxes, homeowners insurance premiums, and home maintenance costs.

Is the 30% rule outdated?

The 30% rule is easy to remember and has been used for many years. However, the housing markets of the 1960s and 1980s were very different from the market of the 2020s.

Lenders look at credit score, down payment size, debt-to-income (DTI) ratio, and debt load when making a lending decision. To understand whether a home will be affordable, you need to go beyond the 30% rule and look at the full financial picture.

When 30% is too high

While a 30% cap works well on paper, it isn't a one-size-fits-all solution. Applying 30% unconditionally can stretch your wallet too far.

You may need to set a lower limit if you have:

• High monthly debt burdens, such as student loans, car payments, or credit card balances.
• Significant recurring healthcare, childcare, or private tuition expenses.
• High local property tax rates.
• High homeowners insurance costs if you’re in a risk-prone area.
• Aggressive personal savings targets, such as building an emergency fund or saving for early retirement.

Is 50% of income too much for a mortgage?

Allocating 50% of your gross income to a mortgage payment is generally unsafe for most buyers.

If half of your pre-tax income goes toward housing, taxes claim another sizable share before you see a dollar of it. That leaves less of your earnings to cover groceries, utilities, transportation, healthcare, debt, and emergency savings, and increases your risk of falling behind if unexpected expenses arise.

However, there are rare exceptions where spending close to 50% may be manageable:

• High-income earners. A household earning $400,000 annually that spends 45% on housing still has substantial cash left over to cover general living expenses.
• High-cost-of-living (HCOL) areas. In cities with exceptionally high housing costs, buyers may intentionally spend a larger share of their income on housing while cutting back on transportation expenses by using public transit.

Mortgage payment example by income

To help you see where you fit, here is how the 30% guideline scales across various income levels:

Why lenders look beyond the 30% rule

While financial planners frequently reference the 30% benchmark, mortgage lenders do not make approval decisions on this single metric alone. Instead, lenders evaluate your credit score, down payment size, cash reserves, and DTI.

Under federal guidelines like the qualified mortgage definition under Truth in Lending Act Regulation Z, mortgage underwriters focus on your complete financial profile to verify your repayment ability.

Front-end ratio vs. back-end ratio

Your DTI reflects how much of your income is consumed by your overall debt. Lenders use your DTI to determine how much of a mortgage you can afford. There are two types of ways that DTI is calculated:

• Front-end DTI. The percentage of your gross monthly income dedicated exclusively to housing costs, including principal, interest, property taxes, homeowners insurance, and HOA fees. Lenders generally prefer this number to stay at or below 28%.
• Back-end DTI. The percentage of your gross monthly income required to pay all recurring debts combined, including your prospective mortgage, student loans, car loans, credit cards, and child support. Lenders generally aim for a back-end ratio of 36% or lower, though some loan programs allow up to 43% to 50% for well-qualified applicants.

How mortgage rates change the number

Interest rates directly affect how much home you can buy within your 30% target. Because higher mortgage rates increase your monthly interest expense, they reduce the total principal amount you can borrow while keeping your monthly payment unchanged.

For example, if your budget allows for a $1,800 monthly principal and interest payment:

• At a 5.5% interest rate, you could qualify for a mortgage loan of roughly $317,000.
• If interest rates rise to 7.0%, that same $1,800 monthly payment drops your maximum loan balance to roughly $270,500.

Even if your income stays the same, rising interest rates reduce your purchasing power while maintaining the same percentage of your paycheck.

What costs make up a mortgage payment?

Your monthly payment includes several components:

• Principal. The portion of your payment that directly reduces the outstanding loan balance.
• Interest. The fee charged by the lender for borrowing the money.
• Taxes. Local real estate property taxes are collected by your county or municipality and are usually held in an escrow account.
• Insurance. Homeowners insurance policy premiums to protect the structure against damage, plus mortgage insurance if required.
• HOA fees. Monthly or annual dues are required if you purchase a property within a homeowners association or condo development.

How can you budget monthly housing expenses?

To determine whether a home will be affordable, it’s important to create a budget. That means you may need to use other budgeting methods, look in lower-priced areas, or find ways to increase your income.

We’ll use the median income as a starting point. According to data from the Census American Community Survey, as of March 2026, the median household annual income in the U.S. was $85,828 – or roughly $7,152 per month. According to the 30% rule, an individual or family with that income would aim for a rent or mortgage payment that does not exceed $2,145 a month.

Recall that housing costs are more than just the mortgage. You also have to pay for things like utilities and taxes. That $2,145 could break down like this:

• Rent or mortgage. $1,741
• Utilities. $100
• Insurance. $80
• Property taxes. $225

Keep in mind that these numbers are flexible. If you can save on utilities, you may be able to afford higher mortgage payments. If utilities run $200 lower, that can free up more money for housing each month. On the other hand, if electricity costs a lot in your area, you might need to find a cheaper home.

Today's reality suggests either that the 30% rule no longer holds or that most people are stretching themselves financially. The average rent for an apartment in the U.S. is $1,663 per month, and the typical mortgage payment is $2,023 a month.

According to 2024 data from the National Association of Builders, a typical family would need to spend 38% of their income to make a mortgage payment on a median-priced new single-family home. Low-income families making half the area’s median income would have to spend a staggering 77% on the mortgage payment of that same home.

For many home buyers, that means exploring other budgeting methods, looking for areas where homes are priced lower than average, or finding ways to increase your income.

Monthly debt payments to include

Start by auditing all recurring monthly debt payments that will remain after you buy your home. Your lender will factor these directly into your back-end DTI:

• Minimum monthly credit card payments.
• Auto loan payments.
• Student loan payments.
• Personal loans or medical debt payment plans.
• Child support or alimony obligations.

A simple budgeting workflow

Follow this step-by-step process to set a realistic monthly housing budget:

1. Calculate net take-home pay. Look at your actual monthly paychecks after taxes, retirement contributions, and health insurance deductions.
2. Subtract non-debt living expenses. Deduct essential costs like groceries, utilities, transportation, gas, childcare, and discretionary spending.
3. Account for recurring debts. Subtract your minimum monthly debt obligations, such as car payments, student loans, minimum credit card amounts.
4. Factor in future savings. Reserve funds for retirement, personal investments, and an emergency savings buffer.
5. Establish your true mortgage target. The remaining amount represents what you can safely spend on total monthly housing costs without straining your finances.

Alternative rules that may work for you

The 30% rule is just one financial guideline that you can use to determine if a mortgage payment is affordable. These other rules may fit your situation better.

The 28/36 rule

The 28/36 rule is another commonly used rule when determining housing affordability these days. This one says that you should dedicate no more than 28% of your gross monthly income to housing and 36% to all debt service, including housing payments. 

For example, if you make $8,000 a month, you would spend no more than $2,240 a month on housing and $2,880 on all debt combined.

This is a lower percentage of your income than the 30% rule, which can make it useful for people who want to ensure that their mortgage payment doesn’t take too much of their budget.

The 35/45 rule

The 35/45 rule is another way to look at housing affordability, but accounting for post-tax income. This rule says you should keep your total debt payment under 35% of your pre-tax income and 45% of your post-tax income.

If you make $6,000 per month, 35% of your pre-tax income would be $2,100. If your overall tax rate is 14%, your post-tax income would be $5,160 per month. 45% of that amount is $2,322. You’d take the smaller of those two numbers, $2,100, and aim to keep your total debt payments below that amount.

The 25% post-tax rule

According to this rule, you should spend no more than 25% of your net income, after taxes and other payroll deductions, on housing. If your take-home pay is $5,000 a month, that means spending no more than $1,250 a month on housing.

What can you afford on a $70k or $100k salary?

Here is a breakdown of target housing payments and potential home price ranges based on standard salary benchmarks.

On a $70,000 salary:

• Gross monthly income. $5,833
• 30% housing target. $1,750 per month
• 28% target. $1,633 per month
• Estimated home purchase price. Assuming a 10% down payment and current interest rates, a $1,600 to $1,750 monthly payment translates to a home priced between $210,000 and $245,000, depending on property taxes and insurance.

On a $100,000 salary

• Gross monthly income. $8,333
• 30% housing target. $2,500 per month
• Conservative 28% target. $2,333 per month
• Estimated home purchase price. With a 10% down payment, a $2,300 to $2,500 monthly budget supports a home priced between $310,000 and $360,000.

Tips for reducing your monthly mortgage payments

If you want to make your home more affordable, you have two options: increase your income or reduce your housing costs. Not everyone can increase their income, so we'll focus more on reducing the mortgage payment.

Here are some tips to cut your monthly payments:

• Improve your credit score. If you have better credit, you can often qualify for a lower interest rate.
• Make a larger down payment. A larger down payment means you pay less principal each month and less interest accrues. It also reduces the lender’s risk, which could help you land a lower interest rate. Larger down payments can also help you avoid paying for mortgage insurance.
• Change your loan term. The longer the term of a loan, the less you’ll pay each month. However, you will typically pay more in interest over the long run, so extending the loan’s term isn’t always best.

How to use a mortgage calculator

If you’re in the market to buy a home, figuring out how much you can afford is key. You can use the home affordability calculator from Rocket Mortgage to get a better sense of how much home you can afford.

FAQ

Here are answers to common questions about budgeting for a home.

What expenses do you need to prepare for besides your mortgage?

Your mortgage payment is just one of the costs of homeownership. You’ll have to budget for some of the up-front costs, like a down payment and closing costs. You’ll also want to have a plan for handling HOA fees, maintenance, and other recurring expenses.

What mortgage loan options are available?

There are a variety of different mortgage programs that you can use to buy a home. Many people use conventional loans, but you can also apply for an FHA loan, which is a popular option for those with small down payments or less-than-ideal credit. There are also more specialized government programs, such as VA loans² and USDA loans. and USDA loans.

How much debt can you have and still get a mortgage?

For a conventional mortgage, the typical maximum allowable DTI is 36%. In some cases, it could be higher if you meet the credit score and cash reserve requirements.

How does a down payment affect your monthly mortgage payment?

With a larger down payment, you do not need to borrow as much money to buy a home.

The bottom line: Factor in the 30% rule before deciding on a home

The 30% rule is an easy rule of thumb for determining housing affordability, but it’s not the end-all, be-all. It’s been around for more than half a century now, and today’s housing market is very different from that of the 1960s.

If you’ve determined your budget and are ready to buy a home, you can apply for a home loan with Rocket Mortgage today.

¹This article is for informational purposes only and is not intended to provide financial, investment, or tax advice. You should consult a qualified financial or tax professional before making decisions regarding your retirement funds or mortgage.

²Rocket Mortgage is a VA-approved lender, not endorsed or sponsored by the Dept. of Veterans Affairs or any government agency.