Here's a question worth asking before you fall for the five-acre lot with the hay field view: if the seller has been paying a fraction of the property tax everyone else pays, what happens to that discount the day you sign?
Most buyers assume the answer is either "it stays" or "it goes." Neither is quite right. In Hillsborough Township, where well over 200 properties currently carry a farmland assessment, the tax break is tied to what the land is doing, not who owns it. That distinction sounds like a technicality. It isn't. It's the difference between inheriting a nice perk and inheriting a bill that can reach back to years before you owned the place.
The Discount Doesn't Belong To You. It Belongs To The Land.
New Jersey's Farmland Assessment Act lets owners of five or more contiguous acres in active agricultural or horticultural use get taxed on what the land produces, not what it would sell for as building lots. That's why a hayfield or a working orchard on the edge of a subdivision can carry a tax bill that looks nothing like its neighbors'. Hillsborough's assessor's office mailed this year's farmland applications on June 12, and the completed form is due back by August 1 each year, a deadline that just passed for this cycle.
The part buyers miss is what happens when the use changes. State law is specific: liability for a rollback tax attaches to the land when a change in use occurs, not automatically when ownership changes. If you buy a farmland-assessed lot and keep farming it, or lease it to someone who does, nothing happens. If you buy it and decide next spring that a pool house makes more sense than a hayfield, you trigger a rollback tax equal to the difference between what was paid under farmland assessment and what would have been paid at full market value, for the year you make the change and the two tax years immediately before it, provided the land was farmland-assessed in those years.
Read that last clause again. The two prior years don't have to be years you owned the property. They just have to be years the land carried the assessment. If you close on a lot that's been farmland-assessed for the past decade and you stop farming it in year one of your ownership, the rollback calculation can reach back into your seller's tax history, not just yours. You're not settling your own discount. You're settling the discount the land has been collecting all along.
A Deadline That Already Came And Went
If you're evaluating a Hillsborough property right now, in the third week of August, that August 1 farmland filing deadline is fresh context, not background trivia. Any current owner who wanted to keep a farmland assessment for the coming tax year had to have that paperwork in already. If a listing agent can't produce a filed FA-1 for a property that's marketed as farmland-assessed, that's worth a direct question before you write an offer, because a missed filing this cycle means the property loses the preferential rate the following year regardless of what the seller tells you it's been getting.
Why More Hillsborough Homes Will Border Preserved Land, Not Fewer
The rollback tax explains what happens on a farmland-assessed lot itself. A second, related mechanism explains what happens on the lots next to one, and it's moving in a direction most buyers don't expect.
In March 2026, the Hillsborough Township Committee introduced Ordinance 2026-03, a measure to permanently protect roughly 430 acres near Hamilton and Amwell Roads, known locally as the Mindel Tract. The township bought the land in January 2022 for $14 million to head off proposals for a natural gas power plant, high-density housing, and warehouse development. Under the new agreement, Hillsborough expects to receive approximately $13.1 million from the state's Agriculture Development Committee in exchange for the development rights, money the township says will offset the debt from the original purchase.
Mayor Catherine Payne called it "the largest single preserved farmland tract in our Township and one of the largest in Somerset County."
Township officials describe the Mindel Tract as expanding Hillsborough's preserved farmland inventory by more than 12 percent in a single action. That's not a rounding error. It means the township is actively adding to its stock of protected agricultural land, funded in part by a dedicated Open Space, Recreation, Farmland and Historic Preservation Trust Fund that's set to raise roughly $2.67 million in the 2026 municipal budget. If you're buying in Hillsborough expecting the rural edges to shrink as the township develops, the current trajectory says otherwise. More parcels, not fewer, are headed toward permanent agricultural protection.
What Protection Actually Means For The House Next Door
Here's where it gets relevant to a buyer who has no farming plans at all. New Jersey's Right to Farm Act exists because the state is dense enough that working farms and residential neighbors are often the same fence line. If a commercial farm meets the Act's eligibility criteria, generally five or more acres and a minimum threshold of agricultural income, it can receive what the law calls an irrebuttable presumption that its normal operations, including noise, odor, and dust, are not a legal nuisance. A neighbor who's bothered by early-morning equipment or manure spreading can't simply sue in state court. They have to file a complaint with the County Agricultural Development Board first, and if the board finds the farm is following generally accepted practices, that finding is close to the final word.
This distinction deserves precision, because it changes what a buyer can rely on. A preserved farm is not automatically entitled to Right to Farm protection. Preservation and Right to Farm eligibility are two separate determinations under state guidance from Rutgers Cooperative Extension. A farm has to meet the Act's criteria and receive its own formal determination regardless of whether the land is preserved. And when a farmer proactively seeks that determination through what's called a site-specific request, the process requires notifying every property owner within 200 feet of the farm and holding a public hearing, so neighbors do get a formal chance to weigh in before protection is granted, just not after the fact through a lawsuit.
For a buyer looking at a lot near the Mindel Tract, or near any of Hillsborough's other 200-plus farmland-assessed properties, that combination matters more than curb appeal. The land staying agricultural isn't just a scenic promise. It's a legal framework that can limit your recourse if farm operations affect daily life on your side of the fence.
Questions Worth Asking Before You Write An Offer
A few things are worth confirming directly with the seller's agent or the township before you're under contract on acreage in Hillsborough:
- Is the property currently farmland-assessed, and was the FA-1 form filed by this year's August 1 deadline?
- If so, how many consecutive years has it carried the assessment, since those years factor into any future rollback calculation?
- What is the intended use of the acreage after closing, and does that use qualify to maintain the assessment?
- Does any neighboring parcel have an active or pending Right to Farm determination, particularly land near recently preserved tracts like the Mindel Tract?
- Has the township's assessor's office confirmed the current farmland-assessed status in writing, rather than relying on what the listing states?
None of these questions are complicated. They just aren't the questions most buyers think to ask, because most guides to buying acreage focus on the discount and skip the mechanics of how it attaches and detaches.
If You're The One Selling
The flip side matters too. If you're selling a farmland-assessed property in Hillsborough, the cleanest path is a buyer who intends to continue agricultural use, since that avoids triggering rollback entirely. If your buyer's plans are murkier, being upfront about the assessment history protects you from disputes down the line and gives the buyer's attorney time to build the rollback exposure into their due diligence rather than discovering it after closing.
Buying or selling acreage in a township that's actively growing its preserved farmland base is a different conversation than buying a standard subdivision lot, and it deserves an agent who treats it that way. If you're weighing a larger parcel in Hillsborough, or trying to understand what a neighboring preservation deal means for a property you're already under contract on, Karen Boose can walk through the specifics with you before you're locked into an offer. Let's Connect.
