As far a I know it applies to 2018.
I am unwilling to guess on any odds. The government has admitted that they made some errors in the new tax law that need to be fixed, but they had been somewhat vague on all but a small handful of things. Therefore there is no way to know what all they didn't intend to have in the law that got in there by accident.What are the odds that the law will change again before the next tax season?

