inflation and taxes please, number, return

willsucceed

In return calculations, most cases they apply inflation on real after-tax return and then divide by 1 - T to get the pre-tax nominal return.

In 2009 CFAI q1 they divide the after-tax return by 1 - T to get the pre-tax return and then apply inflation to get the pre-tax nominal number.

Can anyone explain please?

Many thanks