Mortgage Calculator Guide: How Much House Can You Actually Afford?
Buying a home is the biggest financial decision most people will ever make. Get it right and you build wealth over decades. Get it wrong — stretching for a house you can't truly afford — and you're one emergency away from financial disaster. The difference between a comfortable mortgage and a crushing one often comes down to running the numbers before you fall in love with a listing.
This guide walks you through exactly how to determine how much house you can afford in 2026, what goes into your monthly mortgage payment, how interest rates dramatically affect your buying power, and the rules lenders use to decide whether to approve you.
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The 28/36 Rule: Where to Start
Before you browse listings or talk to a lender, you need a realistic budget. The most widely used guideline in the mortgage industry is the 28/36 rule:
- 28% Rule: Your monthly housing costs (mortgage principal, interest, property taxes, and insurance — known as PITI) should not exceed 28% of your gross monthly income.
- 36% Rule: Your total monthly debt payments (housing + car loans + student loans + credit card minimums) should not exceed 36% of your gross monthly income.
Gross monthly income: $7,500
28% of $7,500 = $2,100/month maximum housing payment
36% of $7,500 = $2,700/month maximum total debt
If you have a $400/month car payment and $200/month in student loans, your max housing payment under the 36% rule is $2,700 − $600 = $2,100/month (same as the 28% limit in this case).
Some lenders will approve you for more — up to 43% or even 50% total debt-to-income ratio. Just because a bank will lend you that much doesn't mean you should borrow it. The 28/36 rule exists to leave room for saving, investing, and living your life without being "house poor."
What's Actually in Your Monthly Mortgage Payment (PITI)
Your monthly mortgage payment isn't just principal and interest. It includes four components, and ignoring any of them leads to an unpleasant surprise:
Principal
The portion that actually pays down your loan balance. In the early years of a 30-year mortgage, only a small fraction of your payment goes to principal — the rest is interest. This reverses over time through amortization.
Interest
The cost of borrowing money, calculated as a percentage of your remaining balance. On a $300,000 loan at 6.5%, your first month's interest alone is $1,625. Over 30 years, you'll pay approximately $382,000 in total interest — more than the original loan amount.
Property Taxes
Assessed by your local government, typically 0.5%-2.5% of your home's assessed value annually. On a $350,000 home, that's $1,750 to $8,750 per year ($146-$729/month). Property taxes vary dramatically by location — research your target area carefully.
Insurance (Homeowner's + PMI)
Homeowner's insurance is required by all lenders and costs $1,200-$3,000+ per year depending on location, home value, and coverage level. PMI (Private Mortgage Insurance) is required if your down payment is less than 20% and typically costs 0.5%-1.5% of the loan amount per year. On a $300,000 loan, PMI adds $125-$375/month.
Down payment: 10% ($35,000)
Loan amount: $315,000 at 6.5% for 30 years
Principal & Interest: $1,991/month
Property Tax (1.2%): $350/month
Homeowner's Insurance: $175/month
PMI (0.8%): $210/month
Total Monthly Payment: $2,726/month
To afford this under the 28% rule, you'd need a gross income of $9,736/month ($116,828/year).
How Interest Rates Change Your Buying Power
Interest rates have one of the largest impacts on how much house you can afford. Here's how the same monthly payment of $2,000 (P&I only) translates to different loan amounts at different rates:
| Interest Rate | Max Loan Amount | Difference from 5% |
|---|---|---|
| 5.0% | $372,600 | — |
| 5.5% | $352,200 | -$20,400 |
| 6.0% | $333,500 | -$39,100 |
| 6.5% | $316,200 | -$56,400 |
| 7.0% | $300,600 | -$72,000 |
| 7.5% | $286,200 | -$86,400 |
A 2.5% rate increase from 5% to 7.5% reduces your buying power by $86,400 — that's the equivalent of losing an entire down payment. Use our Mortgage Calculator to see exactly how rate changes affect your specific situation.
How Much House Can You Afford by Salary?
Here's a quick reference table based on the 28% rule, assuming a 6.5% rate, 30-year term, 10% down, 1.2% property tax, and $175/month insurance:
| Annual Salary | Max Monthly PITI | Approximate Home Price |
|---|---|---|
| $50,000 | $1,167 | $175,000-$195,000 |
| $75,000 | $1,750 | $265,000-$290,000 |
| $100,000 | $2,333 | $350,000-$385,000 |
| $125,000 | $2,917 | $440,000-$480,000 |
| $150,000 | $3,500 | $530,000-$575,000 |
| $200,000 | $4,667 | $710,000-$770,000 |
These are estimates. Your actual affordable price depends on your down payment, existing debts, credit score (which affects your rate), and local property taxes and insurance costs.
Down Payment: How Much Do You Really Need?
The "you need 20% down" advice is outdated for many buyers. Here are your actual options in 2026:
- Conventional Loan: As little as 3% down (5% is more common). Requires PMI until you reach 20% equity.
- FHA Loan: 3.5% down with a 580+ credit score. PMI (called MIP) is required for the life of the loan in most cases.
- VA Loan: 0% down for eligible veterans and active military. No PMI. Often the best deal available.
- USDA Loan: 0% down for eligible rural and suburban properties. Income limits apply.
The True Cost of a Lower Down Payment
5% down ($17,500):
Loan: $332,500 | P&I: $2,102 | PMI: ~$277 | Total: $2,379/month
10% down ($35,000):
Loan: $315,000 | P&I: $1,991 | PMI: ~$210 | Total: $2,201/month
20% down ($70,000):
Loan: $280,000 | P&I: $1,770 | PMI: $0 | Total: $1,770/month
Going from 5% to 20% down saves $609/month ($7,308/year), but requires $52,500 more upfront.
Start building your down payment fund with a structured plan. Use our Down Payment Calculator to model cash to close, then the Savings Goal Calculator to set your monthly target.
15-Year vs. 30-Year Mortgage: The Real Numbers
This is one of the biggest decisions you'll make after choosing how much to borrow. Here's a side-by-side comparison on a $300,000 loan at typical 2026 rates:
| 15-Year (5.75%) | 30-Year (6.5%) | |
|---|---|---|
| Monthly P&I | $2,491 | $1,896 |
| Total Interest Paid | $148,380 | $382,560 |
| Total Cost | $448,380 | $682,560 |
| Interest Savings | $234,180 saved with 15-year | |
The 15-year mortgage costs $595 more per month but saves $234,180 in interest over the life of the loan. That's life-changing money. However, the higher payment reduces your financial flexibility — make sure you can comfortably handle it while still saving for retirement and emergencies.
Hidden Costs Most First-Time Buyers Miss
Your mortgage payment is just the beginning of homeownership costs. Budget for these additional expenses:
- Closing costs: 2-5% of the home price ($7,000-$17,500 on a $350,000 home). Includes appraisal, title insurance, attorney fees, origination fees, and prepaid taxes/insurance.
- Maintenance and repairs: Budget 1-2% of your home's value per year ($3,500-$7,000). Roofs, HVAC systems, appliances, and plumbing don't last forever.
- HOA fees: $200-$500+/month in some communities. These are mandatory and can increase annually.
- Utilities: Typically higher than renting. A 2,000 sq ft house can run $200-$400/month for electricity, gas, water, sewer, and trash.
- Furnishing: An empty house needs furniture, appliances, window treatments, and lawn equipment. Budget $5,000-$15,000 minimum for a first home.
Your Credit Score and Mortgage Rates
Your credit score directly determines your interest rate, which determines your payment and total cost. Here's how credit scores typically map to rates in 2026:
| Credit Score | Estimated Rate | Monthly P&I ($300K) | Total Interest (30yr) |
|---|---|---|---|
| 760+ | 6.0% | $1,799 | $347,515 |
| 700-759 | 6.25% | $1,847 | $364,755 |
| 680-699 | 6.5% | $1,896 | $382,560 |
| 660-679 | 6.75% | $1,946 | $400,690 |
| 620-659 | 7.25% | $2,048 | $437,280 |
The difference between a 760 and a 620 credit score costs $249/month and $89,765 in total interest on the same $300,000 loan. Before house hunting, spend 6-12 months improving your credit score — it's the highest-return financial investment you can make.
How to Get Pre-Approved: Step by Step
- Check your credit report at AnnualCreditReport.com and dispute any errors
- Calculate your budget using the 28/36 rule and our Mortgage Calculator
- Gather documents: 2 years of tax returns, 2 months of pay stubs, 2 months of bank statements, W-2s, and ID
- Shop multiple lenders: Get quotes from at least 3 lenders (bank, credit union, and online lender). Rate shopping within a 14-day window counts as a single credit inquiry.
- Compare Loan Estimates: Focus on APR (not just rate), closing costs, and any lender credits or points
- Get your pre-approval letter: Valid for 60-90 days. This shows sellers you're a serious, qualified buyer.
Strategies to Afford More House (Without Overstretching)
1. Pay Off High-Interest Debt First
Eliminating a $400/month car payment before applying increases your buying power by roughly $60,000-$70,000. Use our Loan Payment Calculator to model accelerated payoff scenarios.
2. Increase Your Down Payment
Every additional $10,000 in down payment reduces your monthly payment by roughly $65-$75 and may eliminate or reduce PMI.
3. Consider a 15-Year Mortgage
Lower rates on 15-year mortgages mean more of your payment goes to principal. You build equity faster and pay dramatically less interest.
4. Buy in a Lower-Tax Area
Property taxes are the hidden budget killer. The same $350,000 house costs $292/month in taxes in a 1% area versus $729/month in a 2.5% area — a $437/month difference.
5. Improve Your Credit Score
Even a 40-point improvement could save you 0.5% on your rate. On a $300,000 loan, that's roughly $100/month and $36,000 over 30 years.
When Renting Is Actually Smarter Than Buying
Buying isn't always the right move. Consider renting if:
- You plan to move within 3-5 years (transaction costs eat most of your equity gains)
- Your local rent-to-buy ratio heavily favors renting (price-to-rent ratio above 20)
- You have high-interest debt that would grow faster than home equity
- Your emergency fund can't cover 3-6 months of homeownership costs
- Your career or life situation is unstable
The American dream of homeownership is powerful, but a home is an investment — make sure the numbers work before the emotions take over.
Frequently Asked Questions
How much house can I afford on a $75,000 salary?
Using the 28% rule, a $75,000 salary allows roughly $1,750/month for housing costs (PITI). At a 6.5% interest rate with a 30-year mortgage and 10% down, that translates to approximately $275,000-$300,000 in home price, depending on property taxes and insurance in your area. Use our Mortgage Calculator to get an exact number for your situation.
What is the 28/36 rule for mortgages?
The 28/36 rule is a lending guideline that says your monthly mortgage payment (PITI — principal, interest, taxes, insurance) should not exceed 28% of your gross monthly income. Additionally, your total debt payments (mortgage + all other debts) should not exceed 36% of gross monthly income. While some lenders allow higher ratios, staying within 28/36 helps ensure comfortable, sustainable homeownership.
How much should I put down on a house?
The traditional recommendation is 20% to avoid PMI (Private Mortgage Insurance), which costs $50-$375+/month. However, many successful homeowners put down 5-10% and invest the difference. With FHA loans, you can put down as little as 3.5%. The right amount depends on your savings, local market conditions, and how quickly you want to build equity. Just ensure you keep 3-6 months of expenses as an emergency fund after closing.
Is it better to get a 15-year or 30-year mortgage?
A 15-year mortgage has higher monthly payments but saves massive amounts in interest — often $150,000-$250,000+ over the life of the loan — and comes with a lower interest rate (typically 0.5-0.75% less). A 30-year mortgage gives more monthly breathing room. Choose 15-year if you can afford the higher payments while still maxing out retirement savings. Choose 30-year if cash flow flexibility is more important.
What credit score do I need for a mortgage?
Minimum scores: Conventional loans need 620+, FHA loans need 580+ (500 with 10% down), VA loans have no official minimum (but lenders typically want 620+), and USDA loans need 640+. However, minimum scores get the worst rates. Aim for 740+ to access the best rates, which can save you $50,000-$90,000 over the life of the loan compared to a score below 660.
How do interest rates affect how much house I can afford?
Interest rates have a huge impact. For every 1% increase in your mortgage rate, your buying power drops roughly 10%. At 5.5%, a $1,500/month P&I payment affords approximately a $264,000 loan. At 7.5%, that same payment only supports a $215,000 loan — a $49,000 reduction. Even a 0.25% rate difference matters: on a $300,000 loan over 30 years, it's about $16,000 in total interest.
Ready to run your numbers? Open the Mortgage Calculator →