You don't need to pay off your back taxes before we settle. We buy houses with back taxes and liens — payoffs get handled through the closing, not by you upfront.
When you sell to us, we pay the closing costs. Your liens are paid off from the sale at closing.
Closing costs and amounts owed against the property are separate. Your mortgage balance, liens, back taxes, and share of current property taxes are not covered by our closing-cost payment; the current amounts are confirmed for the settlement.
A lien is a claim that can affect the property or money due at closing. A payoff is the current amount and instructions from the creditor or office to resolve that claim. A mortgage payoff, a lien balance, and a property-tax balance are different amounts; one notice does not confirm the others.