Tax lien states
The county sells a lien certificate on your unpaid taxes to an investor. The investor pays the tax and earns interest, and you still own and live in the home. If you do not redeem by paying the taxes, interest and costs, the certificate holder can eventually ask for a deed or sue to foreclose. Arizona, for example, waits three years after the lien sale before the holder can sue, and you can redeem until judgment.
Tax deed states
The county or a court sells the property itself. Many of these states give a redemption period after the sale; Texas, for example, gives two years on a homestead. Others give very little time. The notices matter more here, because the sale can be final quickly.
The equity above the tax debt is yours
In Tyler v. Hennepin County (2023) the U.S. Supreme Court held that a government that takes a home for unpaid tax and keeps value above the debt violates the Constitution. Many states have since changed their laws to return surplus. If you had real equity and a small tax bill, claim the surplus and get advice quickly.
What protects you
Call the county treasurer or tax collector before the sale and ask for a payment plan and an exact redemption figure in writing. Many states offer exemptions or deferrals for seniors, veterans, people with disabilities, or low incomes that can lower the bill going forward.