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The Nation's Housing: Calculating the costs of mortgage interest deductions

Mortgage interest deduction has costs

WASHINGTON — Limiting the homeowner mortgage interest deduction came up in two of the presidential debates, but specifics about who would be affected and how much they might lose in tax benefits were minimal. To put some rough numbers on the issue, here's a quick primer on the mortgage interest deduction and related housing writeoffs.

How big are they? Very big — which is why they have become such a tempting revenue-raising target for candidates seeking to reduce the federal deficit. According to estimates from the congressional Joint Committee on Taxation, the mortgage interest deduction alone will "cost" the federal government $484.1 billion between fiscal 2010 and 2014 — $98.5 billion in 2013 and $106.8 billion in 2014. Writeoffs by homeowners of local and state property taxes account for another $120.9 billion during the same five-year period.

Keep in mind: What "costs" the federal government also represents significant tax savings for the people who take the deductions, in this case the millions of homeowners who save thousands of dollars a year that they are not paying to the IRS. In fact, according to a new analysis by Jed Kolko, chief economist for the real estate information site Trulia.com, among those taxpayers who itemize on their federal returns, 49 percent of total writeoffs are housing-related — primarily mortgage interest and local property taxes.

But since only about one-third of all taxpayers itemize on their returns — the rest opt for the standard deductions — who's really getting these tax savings? People who have higher incomes are more likely to itemize and claim mortgage interest and other housing deductions. Citing the latest data on the subject, published by the IRS in 2009, Kolko found that while just 15 percent of households with incomes below $50,000 took itemized deductions, 65 percent of those with incomes between $50,000 and $200,000 did. Just about everybody with income above $200,000 — 96 percent — itemized on their returns.

In an interview, Kolko said that a $25,000 cap on itemized deductions, as proposed by Mitt Romney in the second debate, would hit people in the $50,000 to $200,000 income range, since their average total writeoff (for mortgage interest, charitable contributions and all the rest) was $24,000. It would take a much bigger bite out of upper-income households beyond $200,000, of course, where the average total for all itemized deductions came to $81,000 in the IRS data from 2009. Romney's plan envisions that the losses in deductions for all categories of taxpayers would be offset by the lower payments they'd be making based on a one-fifth reduction in marginal rates. President Barack Obama supports a cutback in housing-related and other writeoffs for people with incomes above $250,000, capping the marginal rate at which they can take their deductions at 28 percent.

What's the outlook on cutting back deductions? Two of the traditional political guardians of the housing tax benefits — the National Association of Realtors and the National Association of Home Builders — say they are digging in for battles next year, no matter who wins the presidential election.

"The real debate" on housing deductions, said Jamie Gregory, deputy chief lobbyist for the Realtors, is not on TV between Obama and Romney, but on Capitol Hill next year, where both groups are planning major defenses.

The Nation's Housing: Calculating the costs of mortgage interest deductions 10/27/12 [Last modified: Monday, October 29, 2012 4:17pm]
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