$300,000 Mortgage Payment: Monthly Cost Breakdown

The Monthly Payment on a $300,000 Mortgage

At a 6.5% example rate over 30 years, a $300,000 loan costs $1,896 a month in principal and interest. That is the figure lenders quote most often, and it is the one most calculators stop at.

It is not, however, what you will actually pay each month. Property tax and homeowners insurance are collected with the mortgage in most cases, and they are not small. With 20% down, a 1.1% property tax rate, and a $1,500 annual insurance premium, the full monthly payment is $2,364.95 — $469 more than the headline number.

The formula behind the $1,896 is the standard amortization equation: M = P × r(1+r)ⁿ ÷ ((1+r)ⁿ − 1), where P is the loan amount, r is the annual rate divided by 12, and n is the number of monthly payments. For this loan, r = 0.005417 and n = 360.

Total Interest and Total Cost

Over 30 years the loan accrues $382,633 of interest. Add the $300,000 you borrowed and the total you repay is $682,633 — interest is 56.1% of every dollar that leaves your account. You end up paying for the house more than twice.

This is the number worth staring at before you sign, because it is invisible in the monthly payment. Two loans can differ by only $100 a month and by more than $80,000 in total interest.

How the Rate Changes the Payment

The rate is a variable, not a constant, and a single percentage point moves the payment a long way. The grid below runs the same $300,000 loan across five rates and both common terms.

Going from 5.5% to 7.5% adds $395 to the monthly payment and $141,940 to the lifetime interest bill — on exactly the same house.

15 Years vs. 30 Years

A 15-year term at the same 6.5% costs $2,613 a month — $717 more — but only $170,398 in total interest. The saving is $212,235, and the loan is half as long.

The honest test is cash flow, not the total. If $2,613 fits comfortably, the 15-year loan is the cheapest way to buy the house. If it does not, take the 30-year term and pay the difference as extra principal when you can — you get the same interest saving with the option to stop, which is worth more than the arithmetic suggests.

The Full Monthly Payment with Taxes and Insurance

Lenders qualify you on the full payment, so it is worth seeing the whole thing in one place. The table below uses a 1.1% property tax rate and a $1,500 annual insurance premium, on the $375,000 home price that a $300,000 loan with 20% down implies.

Down-Payment Ladder

If $300,000 is what you plan to spend on the house rather than what you plan to borrow, the loan — and therefore the payment — depends entirely on your deposit. The ladder below holds the home price at $375,000 and varies the down payment.

Going from 3% down to 20% down saves $402.95 a month. Note that anything under 20% also brings private mortgage insurance, which is not included in these figures — price it separately in the PMI calculator.

What Income This Payment Implies

The 28% front-end rule — housing costs should not exceed 28% of gross monthly income — is the quickest way to sanity-check whether a loan fits. A $2,364.95 full monthly payment implies roughly $101,355 of annual income. Count principal and interest alone and the figure drops to about $81,266, which is why two people with the same salary can be approved for very different loans depending on local taxes.

Lenders also run a 36% back-end test that folds in car loans, student debt, and credit cards. If you carry other obligations, use the affordability calculator to run both tests rather than relying on the front-end figure alone.

Frequently Asked Questions

How much is the monthly payment on a $300,000 mortgage?

At a 6.5% example rate over 30 years, principal and interest comes to $1,896 a month. Property tax and home insurance sit on top of that: with 20% down, a 1.1% tax rate, and $1,500 a year of insurance, the full monthly payment is $2,364.95. Change the rate in the tool above and the figure moves — at 5.5% the principal-and-interest payment is $1,703 and at 7.5% it is $2,098.

How much income do you need for a $300,000 mortgage?

Using the 28% front-end rule, where housing costs take up no more than 28% of gross monthly income, a $2,364.95 full monthly payment implies roughly $101,355 of annual income. If you count principal and interest alone, the figure is about $81,266. Lenders also apply a 36% back-end test that folds in your other debts, so run both in the affordability calculator for a realistic number.

What is the total interest on a $300,000 mortgage?

At 6.5% over 30 years the loan accrues $382,633 of interest, so you repay $682,633 in total against a $300,000 loan — interest is 56.1% of everything you pay. Shortening the term to 15 years cuts interest to $170,398, a saving of $212,235, in exchange for a $717 higher monthly payment.

Does the $300,000 figure mean the loan or the home price?

On this page it is the loan amount — the home price minus your down payment. A $300,000 loan with 20% down corresponds to a $375,000 home. If $300,000 is what you plan to spend on the house instead, enter your down payment percentage under Advanced options and work backwards, or use the down-payment ladder further down this page.

References

• Consumer Financial Protection Bureau — Owning a Home: the official U.S. guide to shopping for a mortgage, comparing offers, and reading a loan estimate.
• CFPB — What is a debt-to-income ratio?: how the 28/36 rule feeds into what a lender will approve.
• Federal Housing Finance Agency (FHFA): the U.S. regulator overseeing Fannie Mae, Freddie Mac, and conforming loan limits.

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