Income taxes and other similar taxes are not counted as zakat. Zakat is a religious duty and an act of worship that is paid with a specific intention and whose revenues are to be given to the recipients specified in verse 60 of sura al-Tawbah.
You must do every thing you can to return the money to its owners either directly to them or to their inheritors if they are dead.
If you tried your best and could not reach to them, then it must be given to the Marja' of Taqleed who will distribute it to the poor as Majhool al-Maalik (unknown owner) on behalf of the real owners.
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