No way to use IDC against California state taxes anymore - starting 2024 the state made you add it back on Schedule CA. The good news is you still get the full federal deduction, which is usually the bigger lever for high earners. For state, you’ll need other moves (max retirement, muni bonds, maybe entity structuring if you open a business).
So the benefit is still very real at the federal level, but for high earners in California, you just can’t use IDC to lower your California state taxes anymore.
