Hello and thank you for allowing me to address your legal question.
When you state the somebody purchased your property tax bill, do you mean that you owed back taxes, and a collection agency bought your debt from the state/local govt.? If so, then the collection agency is entitled to everything that the prior creditor was entitled to, which probably includes penalties, interest and reasonable collection fees.
Of course, that doesn’t mean you shouldn’t negotiate. The collection agency probably paid pennies on the dollar for the debt, and that means that it will still make a profit if it settles for less than the full amount. And the last thing the collection agency actually wants to do is sue you (that takes time and money – i.e. it’s a waste of its resources). It would much rather get what it can and close your account. So, you should absolutely attempt to negotiate the price down.
Does that answer your question?
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DISCLAIMER: Please understand that the complexities of most legal problems cannot be sufficiently addressed in this setting. Accordingly, my post is intended as general information only, and should neither be construed as specific legal advice, nor as an adequate substitute for the retention of legal counsel.