[quote]and if you get audited, you may be required to repay that deduction with penalties. [/quote]
As far as I recall, your chances of getting a face-to-face audit on any given tax return are around 1.5%, lower if you don’t claim EIC. Also, even if it happens, you’re likely to be grilled about some specific item in your return, not everything.
If it does not set off automated alarms in IRS, the chances of it being detected are slim.
One day IRS will coordinate with the state franchise board and it will start getting automated reports of property taxes, with breakdown into tax deductible and non-tax deductible parts. When that happens, 100% of tax returns that deduct mello-roos will start getting responses with corrections.