The White House is urging Congress to limit, or cut, the once untouchable tax break for mortgage interest. In traditional class warfare parlance, the White House cap on mortgage interest deductions will fall only upon the “wealthy.” Let’s not drink the Obama Kool-Aid – the effects of this legislative move will impact everyone.

The Obama administration is proposing reducing deductions for homeowners who earn more than $250,000 pear year. Since I’m a southern California Realtor®, I’ll bring up an example from my local market – the South Bay; in particular, Manhattan Beach, CA.

Chart from LA Times Local Neighborhoods.

Manhattan Beach is a wealthy southern California city, nestled along a prime beach-front location. With 38% of Manhattan Beach residents earning over $125,000 per year, we expect this legislative change will materially impact our local market.

When many home buyers calculate the amount of home they can afford, mortgage interest deductions on income factor heavily into capital service capacity, i.e. how much mortgage they can comfortably afford to pay every month. If a high income earner is in the 34% income tax bracket and has a $5,000 per month mortgage, of which, say, roughly $4,000 is comprised of interest payments, the net annual benefit of the tax break is $16,320, or $1,360 per month.

with a simple 5% mortgage rate, the effect of removing the tax break amounts to reducing home values by $326,400, or 34%, the marginal tax rate. These are very simple assumptions; the reality of this legislative change will likely not be as severe. Higher end properties will likely be impacted the most, with falling price levels manifesting in some way throughout the entire housing market.

President Bush attempted to eliminate the mortgage tax break in 2005, but was stopped by Congress. The Obama administration tried this same legislative change with last year’s budget, but met similar obstacles. Given that the real estate market is in such turmoil, and that so many people gain advantage from perpetuating this tax break, it is unlikely the White House proposal will be accepted by Congress.

What Does The Mortgage Tax Break Mean For The Economy?

There is no free lunch in economics – we’ve all heard that term, right? The same is true for tax breaks, or any legislative market manipulation. Enabling borrowers to write off interest payments from their income tax liability increases incentives to borrow money to buy real estate. This ultimately skews capital structures in that less equity investment is made with purchases relative to debt assumption. Increasing debt levels simultaneously increases prices and risk. In essence, the mortgage tax break causes housing to be “over-capitalized,” siphoning disproportionate capital resources from other parts of the economy.

Eliminating the tax break makes good economic sense; however, the result will inevitably be a deflation in housing prices. The magnitude of the deflation is uncertain. Given that real estate markets are already on shaky grounds, reducing, or eliminating, policies that support home prices can potentially lead to a market route.

All things considered, it is too bad President Bush was not able to repeal this tax break in 2005. That was probably the best time to moderate an over-heated market, and realign national capital resources in a relatively stable environment. We may have missed that opportunity for some time.