AMT and Your Mortgage
One of the costs of living in the Bay Area, and California for that matter, is that you are much more likely to owe AMT (Alternative Minimum Tax) when you file your personal Federal Tax Returns. Other than an act of congress to change the tax law, there’s not much you can do about it. The silver lining on this cloud has to do with… your mortgage.
The original AMT established in 1970 targeted tax shelters used by a few wealthy households and was greatly expanded in 1986 to aim at a different set of deductions that most Americans receive. The AMT sets a minimum tax rate of either 26% or 28% on some taxpayers so that they cannot use certain types of deductions to lower their income tax obligation. Sounds reasonable, right? I mean, why should people who are making millions of dollars be able escape paying their fair share of income tax!? Well, because of the way the AMT is structured, welcome to the life of the rich and famous!
According to the Congressional Budget Office, “Over the coming decade, a growing number of taxpayers will become liable for the AMT. In 2010, if nothing is changed, one in five taxpayers will have AMT liability and nearly every married taxpayer with income between $100,000 and $500,000 will owe the alternative tax.” That will be over 30 million household.
But why are we Californians affected more than the rest of the population? First, incomes in the Bay Area are statistically higher than the rest of the country. But here is the more specific reason: two of the disallowed deductions through the AMT schedule are state income tax and real estate tax.
As of 2007, the highest rate of state income tax is that of California, with a maximum rate of 10.3%. Under the standard 1040 tax schedule, if you itemize your deductions, you are allowed to deduct what you pay in state income tax. Not so under the AMT schedule. Despite the real estate downturn over the past year, values in many places in the Bay Area have remained stable and are still one of the highest priced areas in the US. Property taxes are often a significant part of one’s housing expense, to the tune of 1.25% per year of the assessed value of your home. This too is excluded under the AMT. So what’s a newly rich & famous person to do?
Generally speaking, the interest that you pay on your mortgage for your home remains deductable under AMT. That’s a bit of a blanket statement, so don’t take it as gospel. I’ve discussed this with the brightest of CPAs and they still will say “well… there may be some other issues”. The point being talk with your CPA or Tax Advisor. Nonetheless, let’s go through an example of how this can remain a tax benefit of having deductable mortgage interest on the AMT.
Let’s say you have a $500,000 qualified mortgage and pay 6% interest (and for simplicity let’s say your mortgage payment is interest only). You would have paid $30,000 of interest over the course of the year. If you are subject to the 26% AMT rate and approximately 10% California tax rate, that $30,000 would give you an approximate $10,800 reduction in your tax liability. This basically means that because of the deduction (even under the AMT), that 6% interest rate is costing you about 3.8% on an after-tax basis. Not bad.
What the moral of the story? Tax Efficiency. In the words of Ben Franklin… “In this world nothing can be said to be certain, except death and taxes.” If you accept that premise, then it would be wise structure your mortgage and money to be tax efficient. It’s not too complicated but it can be complex. For the do-it-yourselfers, run through pro formas on your Turbo Tax or other income tax preparation programs. For the rest of us, get good help from a skilled CPA or tax advisor. You need to do this whenever you are buying, refinancing or messing with your mortgage. You could inadvertently make a move that would eliminate your tax benefits.

