Tax lien investing: how it works, what it pays, and where it doesn't exist
Tax lien investing is marketed on two numbers: a high statutory interest rate and a senior lien position. Both are real. Neither describes what most investors actually get. What is tax lien investing, mechanically? A county with unpaid property taxes sells the debt at a tax lien sale; the buyer pays the taxes, holds a tax lien certificate, earns statutory interest until the owner redeems, and in the rare case the owner never does, forecloses on the lien. About half the states run it that way. The other half — Minnesota among them — sell the property itself, or forfeit it to the state, and there is no lien to buy.
The lien position is genuinely strong — property tax outranks mortgages, judgments and almost everything else. The risk is not that you lose your principal. It is that the return is much smaller than advertised, the money is locked up for years, and the cases where you end up with a property are disproportionately the cases where you should not want one.
The advertised rate is a ceiling#
The statutory maximum is the number on every state summary page. It is what you receive only if nobody else wants the lien.
Bid-down interest. The most common auction format. Investors compete by accepting a lower rate, and the lowest bid wins.
| State | Statutory ceiling | What contested parcels reach |
|---|---|---|
| Arizona | 16% | Low single digits |
| Florida | 18% | Often under 1% |
| Illinois | High penalty structure | Bid down substantially |
| New Jersey | 18% | 0%, then premium bidding |
| Iowa | High | Bid down by ownership percentage |
| Colorado | Benchmark-linked | Premium bidding above the lien |
Bid-down ownership. Iowa and a few others run a variant where investors bid down the percentage of the property the certificate conveys if it goes unredeemed. You can end up entitled to an undivided fractional share rather than a parcel — a co-ownership problem rather than an asset.
Premium bidding. Once the rate reaches zero, some states let investors bid a premium above the lien amount. The premium is generally not returned on redemption. A lien that redeems quickly at a premium is a negative return.
Rotational or random assignment. Some counties assign liens by rotation or lot rather than competitive bid. You get the statutory rate and no control over which parcels you receive.
Who you are bidding against. The large online sales in Florida, Arizona and New Jersey are dominated by institutional buyers bidding at scale with automated systems across thousands of parcels. An individual bidding manually is competing with software.
The capital is locked up#
Redemption periods run one to three years in most lien states, and there is no exit during them.
There is effectively no secondary market. Some states permit assignment of certificates, but liquidity is poor and pricing is opaque. Money in a tax lien is money you cannot call back on a schedule.
Subsequent taxes compound the commitment. If the owner keeps not paying, the following year's lien goes to auction too. In most states the existing certificate holder may pay it — and usually should, because another investor holding a later lien complicates the position and can force a race to foreclose. Paying subsequent taxes protects you and means committing more capital to a parcel already in trouble.
Redemption timing is unpredictable. Most liens redeem, but when is outside your control. A model assuming an average holding period is a model with a very wide distribution behind it.
Getting the property is usually the bad outcome#
This is the inversion that the marketing never explains.
Most liens redeem, and that is the intended result. The owner pays, or the mortgage lender pays to protect its security, or an heir pays to protect an inheritance. You collect your principal and interest.
Liens go unredeemed when nobody has an incentive to pay, and the reasons cluster:
| Why nobody redeemed | What you get |
|---|---|
| Landlocked or unbuildable parcel | Land you cannot build on or resell |
| Contaminated or remediation-liable | Cleanup liability that follows the land |
| Structure under demolition order | A bill from the city for the teardown |
| Wetland, floodplain, steep ground | Restricted or unusable acreage |
| Accumulated tax exceeds the value | A parcel worth less than what is owed |
| Tangled title — owner died, no probate | A parcel with real value and no one to pay |
Five of those six are bad. Only the last is the outcome investors imagine, and it is the one where a family is losing an inheritance they may not know they have.
The screening question before any lien purchase: if this parcel has real value, why is no mortgage lender paying the tax to protect its security? The usual answers are that there is no mortgage, that the property has a problem the lender declined to pay for, or that the owner died and nobody opened probate.
Getting title costs more than the lien#
If a lien does not redeem, you do not automatically own anything.
In most states you must file and fund a foreclosure action. That means legal fees, service on every party with an interest, a court timeline of months, and the possibility that a defect in notice sends you back to the start.
Then the title may not be insurable without a further quiet title action. Many title companies will not insure a tax-derived deed until one is complete.
Then the property is yours, along with its problems — the demolition order, the contamination, the lack of access.
Budget the foreclosure before buying the lien. A $3,000 certificate on a parcel requiring a $6,000 foreclosure and a $4,000 quiet title action is a $13,000 purchase, and the parcel needs to be worth more than that.
The costs nobody advertises#
| Cost | When |
|---|---|
| Premium paid above the lien | At auction, often not returned |
| Subsequent year taxes | Annually, to protect the position |
| Foreclosure filing and legal fees | If unredeemed |
| Quiet title action | Usually, to obtain insurable title |
| Recording and deed fees | On conveyance |
| Holding costs once you own it | Tax, insurance, securing, maintenance |
| Demolition or abatement | If the city orders it |
| Environmental assessment | On any parcel with industrial history |
And the opportunity cost of locked capital, which on a three-year redemption at a bid-down rate can be the largest item on the list.
A worked return, honestly#
The advertised numbers make the arithmetic look obvious. Working it through changes the picture.
The advertised version. A $5,000 lien in a state with an 18% statutory rate, redeemed after eighteen months.
$5,000 × 18% × 1.5 years = $1,350 interest
Return on capital: 27% over 18 months
What actually happens on a contested parcel. The same lien bid down to 3%, with a $400 premium that is not returned, and a subsequent year's tax of $1,100 paid to protect the position.
| Line | Amount |
|---|---|
| Lien purchased | $5,000 |
| Premium paid, not returned | $400 |
| Subsequent year tax paid | $1,100 |
| Total committed | $6,500 |
| Interest at 3% on $5,000 for 18 months | $225 |
| Interest at 3% on $1,100 for 6 months | $17 |
| Premium returned | $0 |
| Total received on redemption | $6,742 |
| Net gain | $242 |
| Return on capital, 18 months | 3.7% |
Not a loss. Not what the state summary page implied either, and the capital was unavailable throughout.
The version where it does not redeem. Same lien, no redemption, and you pursue title:
| Line | Amount |
|---|---|
| Committed as above | $6,500 |
| Two further years of subsequent taxes | $2,300 |
| Foreclosure filing and legal fees | $4,500 |
| Quiet title action | $3,500 |
| Total in | $16,800 |
For that you own a parcel that nobody with a financial interest was willing to pay $1,100 a year to keep. The question is not what it is assessed at. It is why nobody paid.
The scams and the near-scams#
Tax lien investing has a large education industry attached to it, and the gap between what is taught and what is achievable is where the money is made.
The advertised-rate pitch. Presenting the statutory ceiling as the expected return, without mentioning bid-down auctions. Legally accurate and practically misleading.
The house-for-pennies pitch. Showing a parcel acquired for a few hundred dollars in unpaid tax without mentioning that such acquisitions are rare, that most come with a foreclosure and quiet title bill, and that the ones which happen are concentrated on parcels with defects.
Over-the-counter lists sold as insider access. Unsold liens are public and available directly from the county at no premium. Paying for a list of them is paying for something free, and unsold usually means unwanted.
Turnkey lien funds with opaque fees. Some are legitimate. The question to ask is what the manager earns whether or not the fund earns, and what the exit terms are given that the underlying assets have no secondary market.
Bidding without parcel research, taught as a volume strategy. Buying a hundred liens without looking at any of them works only if the redemption rate holds and the exceptions are cheap. The exceptions are where the contamination and demolition orders live.
The honest version of this business is patient capital, per-parcel research, a rate floor held under pressure, and a modest return on money you do not need back. That is a real strategy. It does not sell seminars.
What actually reduces the risk#
Research the parcel, not the list. Every serious problem above is discoverable before the auction from free public records — GIS for shape and access, the plat for legal frontage, wetland and flood maps, the city file for demolition orders and code violations, and the recorder index for the reason it went delinquent.
Set a rate floor and hold it. The discipline that separates profitable lien investors from busy ones is walking away when the bidding takes the return below what the risk justifies. In a heavily contested sale that means bidding on very few parcels.
Prefer parcels with a mortgage on them. Counterintuitive, but a lien on a mortgaged property is very likely to redeem, because the lender will pay to protect its security. If you want yield rather than property, that is the profile you want.
Avoid parcels with no structure and low assessed value unless you have specifically established the land has a use. That is where the unredeemed liens concentrate.
Understand the state's foreclosure route before buying, including what it costs and how long it takes. It is the difference between a fixed-income position and an unplanned property purchase.
What the delinquent tax roll actually shows#
Every tax lien sale and every forfeiture begins on the same document: the county's delinquent tax roll, published each year as the list of parcels whose taxes went unpaid. Investors treat it as inventory. Read across a year, it is mostly a list of people who catch up. Govire follows two Minnesota counties' rolls parcel by parcel:
| Hennepin County parcels on the roll, Sept 2026 | 3,113 — 1,726 one year behind, 574 two, 377 three, 161 four to five, 275 six or more |
| Hennepin parcels three or more years behind — inside the forfeiture window | 813 |
| Olmsted County parcels on the January 2026 list | 502 |
| Olmsted parcels paid in full by September 15 | 270 — 54%, in eight months |
| Median still owed by the 232 not yet paid | $1,175 |
Half of a delinquent list clears within the year, and the amounts behind are four figures. In a lien state, that is the redemption rate on the certificates and the reason the yield is what the owner pays to catch up, not the property. In Minnesota, where nothing is sold until forfeiture three years later, it is the reason the forfeited inventory is small relative to the roll — 180 parcels in Hennepin's forfeited inventory against 3,113 on the roll. The Minnesota delinquent property tax list page has the full counts and how to buy property with delinquent taxes in a state that does not sell liens.
Where Minnesota fits#
Minnesota has no tax lien market at all. There is no certificate to buy and no interest to earn. Unpaid taxes lead to a judgment, then a three-to-five year redemption period, then forfeiture to the State of Minnesota, and the county sells the parcel outright under Minn. Stat. ch. 282, after the three-year redemption period in 281.17. Since Tyler v. Hennepin County (2023) the former owner is owed any surplus over the tax debt when a forfeited parcel sells.
For a lien investor that means Minnesota is not a market. For a deed investor it means the inventory is real and the process is comparatively clean — the state's title is strong and there is no certificate holder to negotiate with.
Investors who have learned lien mechanics in Florida or Arizona and assume they transfer will find no auction to attend and no rate to bid down.
Tax lien vs tax deed investing: which are you actually doing#
| Tax lien | Tax deed | |
|---|---|---|
| What you want | Yield | The property |
| Normal outcome | Redemption, plus interest | You own it |
| Bad outcome | Owning a parcel nobody wanted | Overpaying for a bad parcel |
| Capital tied up | 1–3 years, no exit | Until you sell |
| Extra cost to complete | Foreclosure plus quiet title | Quiet title, often |
| Research required | Per parcel, before auction | Per parcel, before auction |
| Suits | Patient capital seeking yield | Property investors |
The most common mistake is buying liens while wanting property. If you want real estate, tax deed states and forfeiture sales sell it directly. Buying liens and hoping they fail is a strategy whose success condition is that somebody could not or would not pay their taxes — and whose most likely version delivers land nobody wanted.
Before you bid#
- Establish the auction format. Bid-down interest, bid-down ownership, premium, or rotational. It determines your realistic return.
- Set a rate floor and accept that you will bid on very few parcels.
- Research every parcel for access, zoning, wetland, demolition orders and contamination.
- Check whether there is a mortgage. A lender protecting its security is the best predictor of redemption.
- Price the foreclosure and quiet title before buying the lien, not after.
- Confirm whether premiums are returned on redemption in that state.
- Plan for subsequent taxes as an ongoing commitment.
- Assume the money is gone for the full redemption period. There is no secondary market.