Tax Sale Due Diligence Checklist for Vacant Land (2026)

Tax-sale lists are full of land nobody wanted: road strips, swamps, cliffs and lots with no way in. The good lots are in there too, often at a fraction of market value, but you only find them by checking every lot the same way. This is the checklist we use, with what it turned up on a real list.

The short version

Checks 1 to 6 are about the land and can be done from a desk with public maps. Checks 7 to 10 are about the sale and depend on your state’s law and the county’s terms.

What a real list looks like

We ran checks 1 to 6 on every lot in the Orange County, New York 2026 tax sale (46 lots on the list we screened on October 18, 2026):

33 of 46 lots (72%) failed at least one check, and 15 failed two or more. Of the 22 vacant-land lots, only 2 came through clean; the lots with houses did much better (11 of 24). That’s normal for a tax sale, and it’s why the checks have to run on the whole list, not just the lots that look cheap. Download the full results (CSV).

The land checks, one by one

1. Road access: is the lot landlocked?

Put the parcel outline on a road map. If a public road runs along one side, note how many feet of frontage there is. If no road touches it, measure the distance to the nearest one. In Orange County, 10 lots had no mapped public road along them, or almost none; where we measured, the nearest road was 74 to 173 feet away. A lot like that needs a recorded easement or a deal with a neighbor before it’s usable, and lenders and buyers will ask.

2. Flood zone

Check the lot against FEMA’s National Flood Hazard Layer. Zones starting with A or V are high-risk (the “100-year floodplain”); X is moderate to low. What matters is how much of the lot is in the high-risk zone and whether the buildable part is outside it. In our sample, one lot was 100% in a high-risk zone and another 70%.

3. Wetlands

The National Wetlands Inventory maps wetlands and open water from aerial photos. A mapped wetland doesn’t always mean you can’t build, but filling one usually needs a permit, and a lot that’s mostly wetland is mostly unusable. Two lots in our sample were 62% and 78% wetland or water.

4. Slope

Use USGS elevation data to measure how much of the lot is steeper than 15%, a common cutoff where building, septic and driveways get hard and expensive. One Orange County lot was 100% steeper than 15%, averaging a 39% grade.

5. Shape: strips and slivers

Tax lists are full of leftover pieces: the strip between two driveways, an old road bed, a sliver from a bad survey. We flag a vacant lot when its average width is under 30 feet. Seventeen Orange County lots were strips, slivers or road right-of-way; several were 1 to 6 feet wide.

6. True acreage

Measure the parcel outline and compare it with the acres on the tax record. Small differences are normal; big ones mean the record or the map is wrong, and you need the deed or a survey. One lot in our sample was 15.17 acres on record but measured 4.6 acres from its outline (70% less).

From these, we work out usable acres: the lot’s measured area minus water, wetland, steep ground and flood zone. Across the 46 Orange County lots, 42.6 acres on record became 32.0 measured and 27.2 usable.

The sale checks

These depend on the state and the county’s terms, so read the sale notice first.

• Title. A tax deed or certificate doesn’t always give title an insurer will accept right away. Ask a title company how they handle tax-sale property in that county.
• Other liens. Some liens can survive a tax sale (federal tax liens, some municipal liens). The sale terms usually say what’s wiped out and what isn’t.
• Redemption. In some states the former owner can redeem (buy the property back) for a set time after the sale. See our state guides as they’re published.
• Occupancy. Recent aerial photos and a drive-by tell you if someone lives there. Removing an occupant is the buyer’s job and cost.
• The sale itself. Deposit, payment deadline, buyer’s premium, and whether lots can be pulled before the sale.

Our process, start to finish

1. Get the county’s list as soon as it posts, with parcel IDs.
2. Run the six land checks on every lot.
3. Drop the deal-breakers; rank what’s left by usable acres.
4. For the top few: read the deed, check liens and redemption, look at recent aerial photos, and visit.
5. Set your maximum bid before the auction starts.

Steps 2 and 3 are what Tax Sale Shortlist does for you on every lot of a county list, with a one-page Parcel Report for any lot you want to look at closely.

Frequently asked questions

What is due diligence at a tax sale?

It is the research you do on a lot before the auction: what the land is (access, flood, wetlands, slope, size) and what you would actually own (title, liens, redemption rights). Most tax sales are sold as-is with no refunds, so the research has to happen before you bid.

Can I do tax-sale due diligence without visiting the property?

You can rule most lots out from your desk with public maps: roads, FEMA flood maps, the National Wetlands Inventory, USGS elevation and the county parcel map. Visit, or send someone, for the few lots you plan to bid on, because maps miss things like a washed-out driveway or a neighbor's fence.

What is the most common problem with tax-sale land?

In the Orange County, New York 2026 list we screened, the most common problem was shape: 17 of 46 lots were narrow strips or slivers (some only a few feet wide) or road right-of-way, which usually can't be built on alone. Steep slopes (14 lots) and no mapped road access (10 lots) came next.

How do I check if a tax-sale lot has road access?

Overlay the parcel outline on a road map and see whether a public road touches it. If none does, the lot may be landlocked: look for a recorded easement in the deed chain before you bid, because a lot without legal access is hard to use, finance or resell.

Does a clean desktop check mean the lot is a good buy?

No. It means the land itself has no obvious deal-breakers. You still need to check title, other liens, the redemption period and whether someone lives there, and to read the county's sale terms.

This guide is general information, not legal or financial advice. Sale rules change: confirm with the county and an attorney before you bid.