Mistax

If a rare transaction is mistaxed, taxpayers have an incentive to find it and exploit it.

Source: wiktionary

That citizens would not be unrepresented, mistaxed, overlorded, or involuntarily impressed into military service put the country in a New World indeed.

Source: wiktionary

More generally, the policy concern that the use of carried interests enables labor income to be mistaxed as preferential capital gain would not seem to depend upon how long a particular investment is held.

Source: wiktionary