I ran the mortgage math for someone last spring who was pre-approved for $420,000 and had found a house listed at $410,000. His bank told him his payment would be $2,200 a month. He wanted to know if that was accurate.
The actual number, when we worked through it together: $3,340 a month. That included property taxes (Illinois, where he lived, runs about 2.2% of assessed value), homeowner’s insurance, and a maintenance reserve of 1% of home value per year. Not some padded estimate. These were reasonable minimums for the actual house in the actual location.
The gap between $2,200 and $3,340 is not a rounding error. It’s $1,140 a month, or $13,680 per year, that his bank’s pre-approval math simply didn’t include.
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What the bank quote actually includes
When a lender tells you your mortgage payment, they’re typically quoting principal and interest (P&I) only. Sometimes they’ll include escrow (property taxes and homeowner’s insurance) if you’re setting up an escrow account, but maintenance, PMI, and HOA fees are often omitted from the headline number.
As of June 11, 2026, the 30-year fixed-rate mortgage averaged 6.52% according to Freddie Mac’s Primary Mortgage Market Survey. At that rate:
- $200,000 mortgage → $1,267/month P&I
- $300,000 mortgage → $1,900/month P&I
- $400,000 mortgage → $2,534/month P&I
- $500,000 mortgage → $3,167/month P&I
Rates have moved since. Freddie Mac’s average was 7.28% on October 1, 2026, which puts that same $300,000 loan at about $2,053 a month.
These are baseline numbers. What you’ll actually pay is different.
The full cost breakdown
Here’s every number that belongs in a real monthly housing cost calculation:
Principal and interest: The payment to your lender. Fixed for the life of a 30-year fixed mortgage.
Property taxes: Vary enormously by state and county; the Tax Foundation publishes effective rates for every county. As an assumption, 1.1% of home value per year is $381/month on a $415,000 home. Your county assessor’s website has your specific rate.
Homeowner’s insurance: Varies widely by location and risk, so get actual quotes.
PMI (Private Mortgage Insurance): Required if your down payment is under 20%. Freddie Mac says to expect roughly $30 to $70 a month for every $100,000 borrowed. It can be cancelled, and it ends automatically once your loan balance is scheduled to reach 78% of the home’s original value.
HOA fees: Zero if none. But if you are buying a condo or in a planned community, HOA fees can be substantial and are a real carrying cost.
Maintenance reserve: A common planning assumption is 1% of home value per year, or more for older homes. On a $415,000 house that’s $346/month as a budget reserve. You won’t spend it every month, but over any 5-year period you will spend it, usually all at once.
Real scenarios at the June 2026 rate
Scenario 1: First-time buyer in the Midwest
- Purchase price: $280,000
- Down payment: 10% ($28,000)
- Loan: $252,000 at 6.52%
- P&I: $1,596/month
- Property taxes (1.1%): $257/month
- Insurance: $120/month
- PMI (~0.75%): $158/month
- Maintenance reserve: $233/month
- Total real monthly cost: $2,364/month
The bank told this buyer his payment would be around $1,600. The real number is $768 more per month.
Scenario 2: Move-up buyer in a high-cost area
- Purchase price: $750,000
- Down payment: 20% ($150,000)
- Loan: $600,000 at 6.52%
- P&I: $3,800/month
- Property taxes (1.3%): $813/month
- Insurance: $220/month
- HOA: $350/month
- Maintenance reserve: $625/month
- Total real monthly cost: $5,808/month
The gap between the “payment” and the real cost is over $2,000 per month.
Why the first years are mostly interest
Of that $1,900/month payment on a $300,000 mortgage at 6.52%, only about $270 goes to principal in month one. The other $1,630 is interest.
This is amortization working as designed. Lenders front-load interest so they collect more of it early. You’re not being cheated; it’s just how fixed-rate mortgage math works.
The implication: in the first 5 years of a 30-year mortgage, you’ve paid a lot in interest and barely reduced the principal balance. If you sell or move in year 4, your equity gain comes mostly from home price appreciation, not from principal paydown.
This is one reason the rent vs buy comparison over a short time horizon often favors renting. Even if home prices rise modestly, the transaction costs and interest-heavy early payments make it hard to come out ahead in under 5-7 years.
Common mistakes when calculating mortgage costs
Using the pre-approval letter as the real number. Pre-approvals show the maximum you can borrow; they don’t show you what the full monthly obligation looks like. Run the actual numbers on the actual house.
Ignoring taxes before you close. In many states, property taxes are assessed based on the sale price, which means your taxes can jump significantly after purchase if the home was previously under-assessed.
Skipping the maintenance reserve. This is the most common new homeowner financial surprise. The HVAC fails. The roof needs work. The water heater dies. You need a plan for that spending. The savings goal calculator can help you build a separate home repair fund with a specific target and timeline.
Forgetting the opportunity cost of the down payment. A $60,000 down payment invested at 7% annual return over 10 years would grow to about $118,000. That’s not an argument against homeownership. It’s an argument for factoring opportunity cost into the comparison honestly.
FAQ
What’s the monthly payment on a $300,000 mortgage at 6.52%? At 6.52% on a 30-year fixed (the Freddie Mac average in June 2026), the P&I payment is approximately $1,900/month. Your actual total housing cost will be higher, noticeably higher once you add property taxes, insurance, maintenance, and potentially PMI and HOA fees.
How much house can I afford on my income? The traditional guidance is to keep total housing costs under 28% of gross monthly income and total debt payments under 36%. At today’s rates and prices, many buyers find those ratios difficult to hit. The mortgage payment calculator will show you the cost for any purchase price. Plug in your numbers rather than working backward from a rule of thumb.
Does it make sense to buy in 2026 at 6.52%? It depends entirely on your local market, your specific situation, and how long you plan to stay. The rate alone doesn’t determine the answer. Run the actual numbers with the Rent vs Buy calculator to compare your specific situation. If you already own and are considering refinancing at current rates, the Refinance Break-Even calculator will tell you how long it takes to recover closing costs.
The bottom line
The mortgage payment your lender shows you is the starting point, not the ending point. The real monthly cost of homeownership runs well above the P&I payment, as the scenarios above show.
Know your real number before you make an offer.
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