It depends.
According to the IRS, only “ad valorem” property taxes (“according to value”) are tax deductible. Many Mello-Roos taxes are not based on the value of the home, which makes many not tax deductible. I see that you have already found the TurboTax Blog article on this subject. The article is several years old, but the law has not changed.
These taxes were added in many local jurisdictions to help offset the effect of California's 1978 Proposition 13 on funding for local services.
If a Mello-Roos tax went to build a library, for example, it is not tax deductible because that is a local benefit. To deduct the tax, you need to be able to show how much of the tax went towards maintenance and interest charges, which can be difficult.
Contact your local homeowner's association and County tax office if needed to determine how the funds are used and how the tax is determined. Your County Assessor's office may have the information on its website.
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