The Laffer curve peaks when the tax rates are at around 65% as per a model predicted and presented in 1995 by the economist Paul Pecorino. You can read about the Taxation System in India – Types, GST, VAT, Objectives, Limitation, Laffer Curve in the given link.

Further readings:

1. Global Minimum Corporate Tax – Minimum tax rate proposed by the G7
2. Base Erosion and Profit Sharing