Plain English
What is a tax lien certificate?
A tax lien certificate is the piece of paper the county gives you after you buy a tax lien. It records which property the unpaid tax belongs to, how much you paid, and the interest rate you are owed when the owner settles.
Prepared by the TaxLienSimple Research Team. Reviewed October 4, 2026. The figures on this page come from inventory we hold and refresh nightly, and each one names the county it came from. See our verification policy.
What is actually written on the certificate?
The parcel it relates to, the amount you handed over, the rate you are entitled to, and the date. Some states call it a certificate of purchase and some call it a certificate of sale. The name changes, the job does not.
It is a receipt and a claim in one document. The receipt part proves you paid. The claim part is what makes it worth something: it is your position in the queue to be repaid.
Is the certificate the same as a deed?
No, and this is the distinction that trips up most newcomers. A certificate says you are owed money. A deed says you own the property. They are different documents with different consequences.
In a few states you can end up converting one into the other if the owner never pays, but that is a separate legal process with its own timetable and cost. The certificate alone never makes you an owner.
What is a tax lien certificate sale?
It is the auction where the county sells these claims. Bidders compete, and in most lien states they compete by accepting a lower interest rate rather than by paying more money. Lowest rate accepted wins the certificate.
Certificates that nobody bids on are kept by the county and sold afterwards, one at a time, at the full rate the law allows. No auction, no competition, no bidding down.
How do I buy one?
At the sale you register with the county or its auction platform, often weeks beforehand, and you bid. Afterwards you can usually just ask the county for what went unsold and pay the amount owed plus accrued charges.
The second route is slower to find and far less competitive, which is why it carries the full statutory rate. It is also where the parcels nobody wanted end up, so the diligence matters more.
Can I sell my certificate to somebody else?
In many states yes, through what is called an assignment, meaning the certificate is formally transferred to another investor. The county records the change and the new holder steps into your position.
Whether it is allowed, and what paperwork it takes, is set state by state. Ask the county that issued it before you assume you have an exit.
What happens to the certificate when the owner pays?
It is redeemed and it stops existing. The owner pays the county, the county pays you your money plus the interest that built up, and the claim is extinguished. That is the ordinary ending.
You do not have to do anything to trigger it and you cannot force it to happen sooner. Redemption is the owner's move, on their timetable, inside whatever window the state allows.
Putting real numbers on it
What a certificate looks like in numbers
- Take the Washington DC lien on 3333 Brothers Pl SE from the District's 2026 bid-back list.
- Face amount of the certificate: $1,010.99
- Of which unpaid tax: $434.37
- Of which penalty, interest and fees already accrued: $576.62
- Rate payable on redemption under DC rules: 1.5 percent a month, or part of a month
The rate runs from when you buy, not from when the taxes first went unpaid. And in DC no interest is paid on any surplus above the certificate amount, which is the sort of detail that only appears in the fine print.
What goes wrong
- You think the certificate is a title document. It is not. It is a claim for money, and selling a house you do not own is not on the table.
- You pay a premium above what is owed. In some states that extra money earns nothing and may not come back to you at all, so it quietly destroys your return.
- You miss the later tax bills. If the owner keeps missing payments and you do not cover them, another investor can take a position ahead of yours in some states.
- You let it expire. Certificates have a life. If you sit on one past the window for acting, you can lose the lot.
- You assume the advertised rate is what you will get. At a competitive sale the bidding takes it down, sometimes to almost nothing.
See it for yourself
Every figure above is taken from inventory we track across 22 states and 280 counties, refreshed nightly from nine county and state sources. You can look at the same rows.
Frequently asked questions
What do I physically receive when I buy a tax lien certificate?
A document, usually issued or mailed by the county treasurer or tax collector, naming the parcel, the amount paid, the rate and the date. Some counties issue it electronically. It is evidence of your claim, not of ownership.
How much do tax lien certificates cost?
The amount owed on the parcel plus fees. In live county-held inventory today that runs from roughly $200 in Lake County, Florida to over $700,000 for a single Washington DC certificate. There is no standard size.
What interest rate does a tax lien certificate pay?
Whatever the state sets, and only if you buy at the full rate. Florida allows up to 18 percent a year, Arizona 16 percent, Iowa 2 percent a month. At a competitive auction the rate is bid down, so the ceiling usually survives only on county-held inventory bought after the sale.
Can a tax lien certificate become worthless?
Yes. If the property behind it has no value anyone will pay for, redemption never comes and foreclosing gets you something unsellable, you lose what you put in. Cheap certificates fail this way more often than expensive ones.
Do I need to live in the state to buy a certificate there?
Usually not. Most counties sell to out-of-state buyers and many sell online. Registration rules, deposit requirements and how you are paid back still differ county by county, so read that county's own terms.
What is the difference between a certificate of purchase and a certificate of sale?
Mostly the state's choice of words. Arizona issues a certificate of purchase, meaning the document recording the lien you bought and the rate you bid, other states issue a certificate of sale, and a few use certificate of delinquency. All three are the document recording the lien you bought.