Calculating the Salary Requirement Fallout from Mortgage Rate Increases

July 3rd, 2013 by 
PK

I wanted to follow up on our Monday piece with a bit more math (I'll do it for you - I know you don't want to bust out the TI-83 in a vacation week).

Today's piece hinges on 'mortgage qualification', because of a few comments on Monday's piece.  In a nutshell, mortgage qualification comes down to two ratios:

  • "Front End Debt To Income" - The percentage of your income which will go towards the mortgage.  For conventional mortgages, this is usually capped around 28%, but underwriters obviously have wiggle room.  FHA comes in with a 31% base, and President Obama's refinance proposals have historically targeted 31%.  We'll use 28% here since we used 20% down last article.
  • "Back End Debt to Income" - The percentage of all debt payments to income.  Conventional is usually capped at 36%, FHA 41%.  This number includes all your other payments - minimum payments on fat credit card debt, student loans, cars, other mortgages.

Too confusing?  I know a guy who made a calculator that helps you calculate home price affordability.  Give him some clicks.

Changes in Income Requirements Due to Mortgage Rate Spikes

Without further ado, here are the changes over the last 2 months (region below chart):

Median PriceNew Price 28% FEDTIOld Price 28% FEDTICost at 4.39%Cost at 3.40%
$208,700.00$35,789.33$31,732.98$835.08$740.44
$269,600.00$46,232.89$40,992.87$1,078.77$956.50
$159,800.00$27,403.62$24,297.70$639.42$566.95
$183,300.00$31,433.57$27,870.89$733.45$650.32
$276,400.00$47,399.00$42,026.82$1,105.98$980.63

(Top: All USA, Followed by Northeast, Midwest, South, and West).  Sources: Bankrate.com, Realtor.org for prices.)

So, the median house in the United States now requires a 12.7% raise for someone making $31,732.98 to afford the same house they could have afforded 2 months ago (Yes, $4,056.35 more income).

So, What's On Tap?

Short week and vacation, you say?  I suppose it's best to open this up to a discussion... how do you think the new income requirements will affect the housing market?  Do you expect there to be an increase in the number of people taking out various flavors of Adjustable Rate Mortgages?  Will refinances dry up?  Will the market plateau?  Will it (shudder) decline again?

Here's your chance to play economist!  Let me know what you think in the comments.

      

PK

PK started DQYDJ in 2009 to research and discuss finance and investing and help answer financial questions. He's expanded DQYDJ to build visualizations, calculators, and interactive tools.

PK lives in New Hampshire with his wife, kids, and dog.

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