What was the second largest region in brittish india

The closest that comes to be a "region" in British India is a province: the official unit of administration. The biggest province of British India was Burma - today's Myanmar.

The second biggest province was Bengal - part of which is today's Bangladesh.

bility-to-pay taxation is a progressive taxation principle that maintains that taxes should be levied according to a taxpayer's ability to pay. This progressive taxation approach places an increased tax burden on individuals, partnerships, companies, corporations, trusts, and certain estates with higher incomes.