Firstly, oppressive taxation is not the Jewish way.
Tirumah, Maaser Rishon, Maaser Sheni, Maaser Ani, Mandatory Korbonos, Maaser B’Haima, Kofin on Tzedaka, Maaser Ksafim, etc 🙂
Besides, Yeravam’s revolt was mostly based on oppressive taxation.
Melachim 1:12:4-5
?????????????, ????????????-???, ????? (????????) ?????????, ?????-????? ??????????; ????????????, ???-????????? ??????. ? ???????, ???????? ???-????????; ???????? ?????? ????? ????????? ??????? ?????????, ?????????? ???????? ??????-????? ????????–?????????????
Then again, to find a Halachic Ani is either very easy (anyone with a mortgage) or very difficult:
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