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How Much House Can I Afford?

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If you wonder how lenders determine how much house you can afford and would like to run your own numbers then you’re in the right place. For this reason, Guaranteed Rate is committed to offering you jargon-free educational mortgage resources on this and many other topics.

Believe it or not, the qualification calculations are so simple a financial calculator is not necessary; you’ll need your monthly debt, monthly income and a basic calculator – or you can run your numbers manually.

Mortgage professionals use debt-to-income (DTI) ratios to qualify you for a mortgage. This ratio takes into account all of your monthly obligations, your monthly income and the monthly payment of your new home (as you can see everything is based on monthly numbers).

First we will begin with a few mortgage terms:

Monthly Gross Income: This is your monthly income before any deductions (i.e. taxes, 401k, insurance) and includes any bonuses, commission, child support and/or alimony received.**

Monthly Debt: This is anything found on your credit report such as cars, credit cards and other loans – only the minimum payments are used. Utility bills being reported do not count as a monthly debt.**

**If you are paying child support, add the monthly child support payments to your monthly debt. If you are paying alimony, the majority of the time alimony will be added to your monthly debt; however, there are some lenders that will require alimony to be deducted from your gross monthly income. You’ll need to discuss the details with your chosen mortgage professional.

Proposed Housing Payment:  This is the amortized principal and interest payment, property taxes and homeowners insurance for the house you are purchasing.

Now let’s look at the numbers:

For this example we will assume the purchase of a single family home with no mortgage insurance. The purchase price is $200,000 with a 20 percent down payment. Also, the payment calculated includes monthly taxes of $250 and homeowners insurance of $66.

Monthly Gross Income: $4,166 (this is $50,000 annually)
Monthly Debt: $650
Monthly Housing Payment: $1068

We now have all of our pertinent information, let’s do the math!

$1068 (mortgage payment) / $4166 (income)  = 25%
$1068 (mortgage payment) +$650 (debt) / $4166 (income)  = 41%

Your DTI is 25%/41% –  these are good ratios. Ideally your back-end ratio (this is the 41%) should not exceed 43%, but there is some room as DTI limits will vary slightly from lender to lender.

You don’t want to become a slave to your mortgage so be realistic about how much you can afford and be very clear about your financial goals.

Guaranteed Rate, your resource for reliable, easy-to-understand mortgage information. 

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All information provided in this publication is for informational and educational purposes only, and in no way is any of the content contained herein to be construed as financial, investment, or legal advice or instruction. Guaranteed Rate, Inc. does not guarantee the quality, accuracy, completeness or timelines of the information in this publication. While efforts are made to verify the information provided, the information should not be assumed to be error free. Some information in the publication may have been provided by third parties and has not necessarily been verified by Guaranteed Rate, Inc. Guaranteed Rate, Inc. its affiliates and subsidiaries do not assume any liability for the information contained herein, be it direct, indirect, consequential, special, or exemplary, or other damages whatsoever and howsoever caused, arising out of or in connection with the use of this publication or in reliance on the information, including any personal or pecuniary loss, whether the action is in contract, tort (including negligence) or other tortious action.

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