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Here's the tax advise. Taking out additional debt like mortgage just to get a tax deduction is the worst tax and financial planing. You will never get the full benefits of the money you spend on interest. Lets assume you are in the highest 39.6% tax bracket, for every $1000 interest you pay to bank you will reduce your actual taxes by $396 and this is only if you will not be hit with Alternative minimum tax, which with your income is very likely. The more deductions you use the higher AMT will be and your taxes will not change. And the same will apply to your property taxes.
If your mortgage is over 1M, your you will not be able to deduct the entire interest, HELOC has to be less than $100,000 for the interest to be deductible.
If you want to lower your tax bill you will need to restructure your income, not to look for more deduction. Capital gains are usually taxed at lower rate. I would strongly advice you to talk to a experienced financial adviser with experience in estate planing. Salary deferment is another option. Considere 401K, HSA, maybe your company has some other retirement plants that will reduce your current W2 income and shift tax liability to the future years.
To be completely honest with you, with income over 500K your deductions are often limited or eliminated and some point becomes worthless.
For years politicians have been talking about eliminating mortgage interest deductions for good and with the tax overhaul it may become reality in near future.
Sorry, if this is not the answer you were hopping for.