I'd choose a longer period than 1 year - the are always ups and downs from one year to the next. Let's take Amazon as an example: their effective tax rate from

I'd choose a longer period than 1 year - the are always ups and downs from one year to the next. Let's take Amazon as an example: their effective tax rate from 2012 for 5 years is 12%. They can only pay that because they have armies of tax accountants looking for loopholes. Small local businesses - the ones who might compete with Amazon - can't afford those accountants so they pay the statutory tax rates.