Living in a high state income tax state, I am occasionally subject to the AMT. How do I do a rough calculation to see if it makes sense to pay my Q4 state income tax estimated payment by December 31, rather than January 15?
This year my taxable income will go up, which suggests I can pay a greater amount of state income tax without getting hit by the AMT. On the other hand, if I wait until January 15 for my Q4 payment, next year's state tax payments will be extra high, with next year's estimated state payments all being increased based on 2007 taxable income.
Is there a rule of thumb or quick calculation? The IRS AMT "assistant" seems to want you to have your tax form completely filled out before it can "assist".
thanks.