Tax slabs mentioned in budget of feb2025

I want to know , from which year the tax slabs , and modification in rebate under sec 87a as mentioned in budget 2025  are applicable??

Fy 24-25 or fy25-26

Many articles on internet are confusing, many of  them are mentioning it as from fy 25-26

Also are the itr forms for fy 24-25 notified?

Please guide.

Kind regards

Dilip