Home mortgage interest deduction is not a loophole, please look up what a loophole is.
Why is it not a loophole? Other loan interests aren't deductible but home mortgage interest is. Why isn't the special treatment for this one type of interest a loophole? But the point is that there is no objective test for whether something is a loophole. Roughly speaking, it's something that is given a special break relative to other things that are similar and objectively should have similar treatment perhaps as a social engineering way to encourage things, perhaps as a special gift to a privileged group. Objectively, home mortgage interest is essentially no different from credit card interest and there's no reason taxes should treat them differently.
Here are some example loopholes Romney closed in MA while he's governor:
* Removed tax shelter status for fake "real estate lenders", (because banks were posing as real estate lenders to exploit this tax loophole)
* Computer software purchased in Massachusetts stores was subject to sales tax, but the same product downloaded from the Internet was not.
I'm not sure why it's a loophole that you pay Massachusetts tax for a purchase made in a store in Massachusetts but not for a purchase not made in a store in Massachusetts. If that's a "loophole" then so is mortgage interest being deductible if it's for a home but not for a car. At least in the sales tax case, it's the absence of a State nexus that controls taxability, not the product purchased.
* Trusts were used as intermediaries in the sale of businesses to limit taxes on the transactions.
* Companies like WorldCom Inc., headquartered in low-tax states, charged subsidiaries located in MA royalty fees for business ideas coming from the home office. That moved money from MA to another low tax state, lowering taxes.
* Increased fee for use of Public land/facility, instead of subsidized by tax-payer.
Okay, fine. So what *Federal* loopholes would he close?
Why he hasn't disclosed which loopholes he want to close on the Federal level? because that would be too easy for Obama to steal, Obama has already stolen his idea of "closing loopholes" shown by yesterday's debate. Of course Obama has no idea which loopholes to close, since Obama has ZERO record of closing them after having the job for 4 years. Romney has the experience and the record, and that's good enough for me to believe him.
If Romney is going to keep his plan a secret, there is no way I can evaluate whether it's a good plan or not. Bluntly, it seems *impossible* -- they're just aren't the kinds of loopholes that would create enough revenue, other than loopholes that would hit the middle class and small businesses heavily.
Is the earned income tax credit a "loophole"? I don't know if Romney considers it one. Is the home mortgage interest deduction a loophole in Romney's eyes? What about the self-employed health insurance deduction? Frankly, I have no idea what his plan is, and I can't reliably assess who it will help and who it will hurt. This is a huge *negative* against Romney to me.