Word to the wise; Keystone is using a technique called a ' jeopardy amount', trying to collect an amount they have no legal mandate for. Essentially, it works like this: Taxpayer 'X' owes an amount to a municipality. Said municipality has no facility or resources to collect this amount, so they sub-contract to keystone, or another company like it, for a percentage of the amount collected. To get you to pay attention, the firm uses an exorbitant amount ( typically 3-4x tax owed) then will either 'negotiate' it down, or if you are stupid enough to pay that figure ( most people do, they wrongly assume that it is required, that's why these firms exist) they will just take your payment, keep the ' jeopardy amount' and their % fee, and give the township the tax(after collecting a bit of interest on the money, too, of course) Bottom line is, they have a mandate to collect the tax, and a small percentage in a late fee which will vary by municipality, but NO MORE than that. READ your local laws carefully, or hire an attorney, they will immediately drop the excessive amounts. Call them out, don't pay them. Source: local CPA.