I'd just make a new law targeting schemes to enable/encourage tax evasion. It would hit airlines who sell $$$$ worth of tickets each year, but then hand out di

I'd just make a new law targeting schemes to enable/encourage tax evasion. It would hit airlines who sell $$$$ worth of tickets each year, but then hand out discount vouchers/points/miles to customers (many of whom bought the original tickets on business expenses, but take the vouchers/points/miles personally, thereby evading tax). The tax authority would be able to estimate the 'value' in vouchers handed out (not the book cost or stated face value, but what customers value them at), the percentage of those vouchers that represent tax evasion, and then fine the airline 3x the lost taxes. Same for starbucks loyalty cards etc.