Budget: Maximum Mortgage Payment

Photo by David Veksler on Unsplash

You are in the market to buy a house. You have found a house that you really like. The price of the house is within your range. Now it comes down to determining if you can afford the monthly mortgage payment that includes principle, interest, real estate tax and insurance (homeowners insurance and private mortgage insurance, if applicable). These are called PITI. Let’s take a look at the….

15 / 20 / 25 Mortgage Plan

15-Year Mortgage

The interest you will pay over the 15 years is substantially lower than the interest you will pay for a 25-year or 30-year mortgage. Additionally, you will accumulate equity much faster with a 15-year mortgage since most of your early monthly mortgage payments are applied to interest … not principle.

20% Down Payment

You will start off having equity in your house if have at least a 20% down payment. You won’t be required to purchase private mortgage insurance (PMI). This will save you hundreds of dollars a year until the PMI is no longer required.

25% of Net Income to Mortgage Payment

There is one thing everyone needs to understand: mortgage lenders will allow you to bury yourself with mortgage debt.

As a rule of thumb, mortgage lenders will grant you a loan if the monthly PITI mortgage payment does not exceed 28% of your gross income.

I, and many other financial gurus including Dave Ramsey, believe that your PITI mortgage payment should not exceed 25% of your net after-tax income. If it does, you will not have the money necessary to maintain your house as needed. You will also have to think twice about going out for a special dinner with your spouse or friends, taking a nice vacation or buying a newer car.

Photo by Helloquence on Unsplash

Real Life Example

To start by making some assumptions to see if the potential buyer qualifies for a mortgage or can afford it within the 15 / 20 / 25 Mortgage Plan guidelines.

  • $150,000 Purchase price of house
  • $ 30,000 Down payment (20%)
  • $ 80,000 Annual household gross (before taxes) income
  • $ 64,000 Annual household net (after taxes) income or $5,333 monthly
  • $ 3,000 Annual property tax
  • $ 1,200 Annual cost of homeowners insurance
  • 3.30% Mortgage interest rate on a 15-year mortgage
  • 720+ Credit score

The first thing the assumptions illustrate is that the potential buyer is able to meet the 20% down payment objective.

The potential buyer has a history of being able to manage their money. This is documented by having enough money to make a 20% down payment and by having an excellent credit score. This indicates the potential buyer has the ability to pay for a 15-year mortgage that requires a higher monthly mortgage payment over a 30-year mortgage.

A mortgage loan in the amount of $64,000 at a 15-year fixed rate of 3.30% results in a total monthly mortgage payment of $1,196.12 or 22.4% of household monthly net income. The potential buyer qualifies for a mortgage. The 25% maximum monthly mortgage payment to monthly net income objective is met.

The potential buyer is nervously excited because he/she is close to being the new owner of the home they want and have been saving for.

Note on Calculating Net Income

There are special items that need to be deducted from gross income in calculating net income to arrive at an accurate and credible number.

  • Self-employment tax for self-employed individuals
  • Health insurance if individually purchased
  • Any court-ordered alimony and/or child support obligations


The same 25% monthly payment-to-net income applies to renters as well.

My Other Websites

Perspectives on Life (Blog)
Taking a Closer Look

Life Under Change
Quotes that inspire, challenge and comfort us.

A Life Within (Blog)
Journal of a Highly Sensitive Introvert

Top of page

Published by W. M. Brown

I am a retired U.S. expat living in Ecuador. I was a business owner for 32 years before retiring in 2012.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.

%d bloggers like this: