The SALT limitation of $10K (8960 worksheet Pt 2, 9b, line 5) is really not going to affect most folks. Looks like they cap the REDUCTION in net investment income due to SALT at $10K, but after computing the ratio of gross to investment income, they include all of the SALT in computing the portion allocable to investment income. This is what then is capped at $10K. Not an issue for me.
The more important issue is that TurboTax doesn't do any of this if it uses the standard deduction.
