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New Cars Cost More in September and Were More Affordable!

October 14, 2015

The light-vehicle average transaction (ATP) rose $163 to $30,640 in September, but was outpaced by a $576 jump in the U.S. median household income (MHI). As a result, the September Auto Buyer’s Affordability Index (ABAI) rose to 58.0, an increase from the August value of 57.4. An ABAI of 58.0 indicates that a prudent, median-income household can only afford 58 percent of the new-car average price.

Link to AffordCheck(SM), an affordability calculator based on the 20-4-10 rule

The ABAI has trended up since December 2014. Prices are down and incomes are up.

Median income buyers gained $124 of buying power (the affordable price change minus the ATP change) from August to September, and $2,498 since the December 2014 price spike. Since December, both the affordable price (a function of income, insurance, interest rate, and sales tax rate) and the ATP have moved in supportive directions.

New-car buyers gained $2,498 of buying power since December 2014

Pressure on new car prices is anticipated to continue as competition (versus used cars and between automakers) increases and as interest rates rise. New-car affordability should continue to improve into 2016 as long as U.S. economic growth continues.

Regardless of the state of overall affordability, each new-car buyer can preserve her own financial health by first ensuring that the purchase is affordable. Requisite Press recommends that consumers apply the 20-4-10 auto financing rule (see below) to more easily assess the affordability of a new-car purchase. Consumers can verify affordability throughout the car-buying process with AffordCheck℠, a free online tool based on the 20-4-10 rule. AffordCheck℠ can be used to determine an affordable price range, and it can also be used to assess specific offers as they are received.

20-4-10 Auto Financing Rule

The 20-4-10 auto financing rule consists of a minimum 20 percent down payment, a maximum 4-year loan term, and monthly payments of no more than 10 percent of gross household income (including insurance). The rule is widely recommended by personal finance experts to maintain financial security, avoid excessive interest costs, and preserve future investment opportunities.

ABAI Methodology

The affordable monthly payment (including principal and interest) is calculated by taking 10 percent of the U.S. monthly median household income and subtracting a U.S. average monthly insurance premium. The affordable price is then calculated using the affordable payment, along with a U.S. average 48-month auto loan interest rate and a U.S. average sales tax rate. A 20 percent down payment is assumed. The ABAI is calculated by dividing the affordable price by the average transaction price and then multiplying by 100.


Table of ABAI results for September 2015 including max affordable price of $17,776 and affordable payment of $352

ABAI source data for Sept 2015 including interest rate (4.23%), insurance ($113/mo), and sales tax (7.3%)

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