The top five had an effective total state and local tax rate on the median U.S. household of 7.07%.

The worst five states had an average effective total tax rate on the median U.S. household of 14.31%.

From 2020 and 2021, seven different tax return types varied by more than 20% (up or, in one case, down) in terms of how many were filed year over year.

Just two issues accounted for almost a third of all cases where people sought assistance from the Taxpayer Advocate Service.

Federal stimulus payments may have helped many taxpayers make it through the first year of COVID, but they also were a huge source of errors on tax returns.

The top five states in our ranking had an average individual income tax refund of $1,742.80 in 2021.

The top five states had combined tax returns filed of more than 99 million for 2021.