Your federal K-1 shows a loss. Your Wisconsin K-1 shows income. Same property, same year, two different signs on the bottom line.
The federal side is the number everyone in the deal is looking at. The cost segregation study runs, bonus depreciation lands, and the federal return throws off a large first-year loss. That loss is the headline, the reason the deal got pitched as a tax play in the first place, the figure the sponsor put in the deck. Almost nobody in the room stops to ask what the state does with the same set of facts, and that unasked question is where LPs get surprised.
Bonus depreciation is a federal acceleration mechanism under Section 168(k). It lets you pull a huge chunk of an asset's depreciation into year one instead of spreading it over decades. A cost segregation study feeds that machine by breaking a building into shorter-life components that qualify for the acceleration. Federally, the two together can turn a profitable property into a paper loss in its first year. The mechanism is real and it is powerful. It just is not universal, and the place it breaks down is the state return.
Wisconsin Runs Its Own Depreciation
Wisconsin does not conform to Section 168(k). It disallows bonus depreciation entirely. The state gives you regular depreciation over the asset's normal recovery life and nothing more, so the giant first-year write-off that dominates the federal return simply does not exist on the Wisconsin return. The state never recognized the acceleration in the first place, so there is nothing to deduct beyond the ordinary annual amount.
Run the two calculations side by side on a deal that has real operating income, and the divergence is stark. On the federal side, you start with the operating income and subtract the full bonus deduction, which is large enough to overwhelm the income and produce a net loss. On the Wisconsin side, you start with the same operating income and subtract only a single year of ordinary depreciation, which is a sliver by comparison. The income survives the subtraction, and the Wisconsin return shows net income.
One deal, one year, one set of numbers going in, and the bottom line comes out negative federally and positive for Wisconsin. Nothing was done wrong. The two governments simply have different rules for the same depreciation, and the gap between them shows up as opposite signs on the two K-1s.
The Part Your LPs Actually Feel
This is where an abstract conformity issue turns into a check somebody has to write. That Wisconsin income triggers a filing obligation in a state your investors may have never set foot in. Passive LPs who put money into a deal touching Wisconsin can find themselves with a Wisconsin nonresident filing requirement because the partnership generated income sourced to the state.
Often it is worse than a filing chore. Nonresident withholding or a composite payment frequently comes out of the LP's distribution before the money ever reaches them. The partnership withholds Wisconsin tax on the investor's behalf and remits it to the state, which means the LP sees a smaller distribution and a state tax obligation in the same year they were promised a first-year write-off. They were sold a loss and they are funding a payment to Madison. That is a hard conversation to have after the fact, and it lands entirely on the sponsor who modeled only the federal side.
They were sold a loss, and they are funding a payment to Madison.
The Deduction Is Not Gone, Just Slow
It is worth being precise, because this is not a permanent loss of the deduction. Wisconsin lets you recover the depreciation the slow way, over the asset's regular depreciable life. The state computes its own depreciation and basis, and the difference between the federal and Wisconsin treatment reverses gradually as ordinary recovery plays out over the property's life. Over the long arc, the total depreciation is similar. The timing is what differs, and dramatically so.
That long-run symmetry is cold comfort to the investor writing a Wisconsin check this April. Getting the deduction back over the next couple of decades does not help the LP who was told to expect a loss now and instead owes tax now. The value of a deduction is bound up in its timing, and the state took the timing away even though it left the total intact.
There is a further wrinkle that catches even careful sponsors. Because Wisconsin computes its own depreciation and basis from the start, the property carries two separate basis figures for the rest of the hold, one federal and one for the state. Those figures do not converge until the asset is fully depreciated or sold, and at the exit they can produce a different gain for Wisconsin than for federal purposes. In other words, the divergence you see in year one is not a one-time event. It follows the deal all the way to the sale, and it needs to be tracked the entire time rather than rediscovered at disposition. A sponsor who models only the federal basis is carrying an incomplete picture of the deal's state tax life from the first year forward.
Know the Answer Before You Model the K-1s
State conformity to federal depreciation is a patchwork, and it moves. Some states conform fully, some decouple entirely like Wisconsin, and others use partial addbacks with their own recovery schedules. The rules change as legislatures act, so last year's answer is not automatically this year's. The only safe move is to know the answer for every state your deal touches before you model the K-1s, not after you have already sent them to investors with a first-year loss printed on the front.
The discipline here is simple to state and easy to skip. Federal is one answer. Every state your deal touches is a separate answer, and at least one of them may reverse the sign on the number your LPs are counting on. Model both before the close, set expectations honestly, and no investor gets a surprise bill from a state they have never visited.
This is general education, not tax advice. State conformity to Section 168(k), Wisconsin's depreciation and basis rules, nonresident filing and withholding obligations, and composite payment mechanics are fact-specific and change over time. Confirm the current treatment for every state your deal touches with your CPA before you model the K-1s or sell an LP on a first-year loss.