If you want to know what's bugging U.S. taxpayers about the tax system, check out the issues where they're looking for help from the Taxpayer Advocate Service.
In 2020 (the latest year for which data was available), the top five TAS services accounted for just over half (50.4%) of all cases — and the top two made up almost a third of them (31.3%).
Scroll through to see which service case types were in the top fifteen.
Source: Internal Revenue Service Data Book, 2021