An earn-out clause the buyer's tax team wrote to their own advantage

The situation

Daniela had already sent two rounds of markup back to the buyer's lawyers before she called our office, and both times the response came back with the earn-out language essentially unchanged, just accompanied by a longer explanation of why it had to stay that way. She had built an actuarial consulting firm in Hamilton over almost twenty years, with Katalin running sales as the firm's sales director for the last several of those, and the two of them had negotiated the sale of the business to a much larger US-based insurance analytics company directly, believing their working relationship with the buyer's deal team, led by Attila, was collaborative enough that they did not need aggressive outside counsel involved from the start. That belief had served them reasonably well through the early stages, when the conversation was about strategic fit and Daniela's team's willingness to stay on through a transition period.

The transaction was valued in the thirty-to-fifty-million-dollar range, with roughly a third of that value structured as an earn-out tied to the firm's revenue performance over the two years following closing. Daniela had negotiated the size of the earn-out and the performance targets herself, spending weeks modelling what growth the firm could realistically sustain under new ownership, and she was satisfied with those numbers. What she had not caught, because it was buried in mechanics rather than headline terms, was how the earn-out payments would actually be taxed once they crossed the border from the US buyer to Daniela and the firm's other Canadian shareholders, a detail that lived in a schedule neither she nor Katalin had thought to have independently reviewed.

By the time Daniela brought the deal to us, the purchase agreement was in what the buyer's team called its near-final form, and Attila's position, communicated politely but firmly through counsel, was that the earn-out mechanics had already gone through the buyer's internal tax review and reopening them risked delaying a closing date the buyer had told its own board would happen on schedule. Daniela's own two attempts to push back had been met with reassurance rather than substance, which was what finally convinced her she needed advisors who could evaluate the technical claim rather than simply take the buyer's word for it. She had built her firm on precision, on actuarial models where getting the assumptions wrong showed up in the numbers eventually, and something about accepting a tax explanation on faith sat uneasily with the way she approached everything else in her professional life.

The complication

The earn-out as drafted characterized each annual payment as ordinary income sourced from the US buyer. Whether that characterization actually triggered US withholding tax at the border before the funds reached Daniela and the other Canadian shareholders was not a foregone conclusion - it turned on how the payments were characterized and on the Canada-US tax treaty, which frequently reduces or removes withholding on cross-border payments to Canadian residents, and it was ultimately a question for US tax counsel to answer against the actual drafting. As drafted, though, the earn-out's mechanics did not clearly support treaty-reduced treatment, which put Daniela and her co-shareholders at real risk of losing a meaningful slice of each earn-out payment to withholding that better drafting could likely have avoided, on top of whatever Canadian tax applied once the funds arrived, a combined drag that could have run into six figures annually against the size of payment Daniela was expecting each year.

The buyer's tax team had drafted the mechanics that way for a reason that had nothing to do with Daniela's interests: characterizing the payments as ordinary income sourced in the US simplified the buyer's own accounting and gave them cleaner treatment on their side of the border, even though it came at direct cost to the seller. When Daniela and Katalin had tried to raise this in their own negotiations, the buyer's team had characterized the structure as standard and non-negotiable, which was not entirely accurate but was hard for Daniela to counter without her own tax and legal advisors working the numbers, and Katalin, who was more comfortable with sales conversations than tax mechanics, had found the exchanges increasingly frustrating without being able to pinpoint exactly why the buyer's explanation felt unsatisfying.

The buyer also had resources Daniela's firm did not. It was a company many times the size of hers, with an in-house tax department and outside counsel who did this kind of cross-border structuring regularly across dozens of acquisitions a year, and Attila had been direct, without being hostile, about the fact that the buyer had little incentive to spend more time or money reworking mechanics that already worked fine for them. The imbalance was not subtle, and it meant any renegotiation would have to be won on the strength of the technical argument, not on goodwill or relationship capital, both of which Daniela had already spent trying to fix this herself over two rounds of markup that went nowhere.

There was also a real risk in pushing too hard. Attila's team had made clear, without quite saying it outright, that a buyer with this many acquisitions in its pipeline had other targets it could turn its attention to if this one became more trouble than it was worth, which put a practical ceiling on how far Daniela could press the point.

What we did

1. Modelled the actual after-tax value of the earn-out as drafted. Before making any argument to the buyer, we worked with tax advisors to calculate precisely how much of each projected earn-out payment would be lost to withholding under the existing mechanics, turning an abstract concern into a specific dollar figure Daniela could see and the buyer could not easily dismiss.
2. Identified the treaty-based structuring the mechanics were missing. The withholding exposure came from how the payments were characterized and routed, not from anything inherent to an earn-out itself; we drafted alternative mechanics that characterized the payments in a way more consistent with reduced-rate treatment under the applicable tax treaty, without changing the earn-out's size or performance targets Daniela had already agreed to.
3. Separated the technical fix from the relationship Daniela had already strained. Because Daniela's own back-and-forth with Attila's team had grown a little tense over two rounds of markup that went nowhere, we took over direct communication on this specific point rather than letting it stay folded into every other conversation about the deal. That let the technical argument stand on its own merits, evaluated by advisors rather than read as Daniela reopening terms she had already accepted, which lowered the temperature considerably.
4. Anticipated the buyer's cost objection before raising it. Knowing a buyer this size would resist anything that complicated their own accounting or added a new internal approval step, we structured our proposal to minimize the administrative burden on their side rather than presenting the fix purely as a benefit to Daniela. We showed the treaty-consistent mechanics could be implemented through a payment routing change rather than a fundamental redesign of the earn-out, which took away their easiest objection before they could raise it.
5. Escalated past the deal team when the response stalled. When Attila's team continued to describe the structure as standard without engaging with the specific tax modelling we had provided, repeating the same reassurance rather than a substantive answer, we requested that the buyer's own tax counsel review our analysis directly instead of relaying it through the deal team. That moved the conversation to advisors capable of evaluating the treaty argument on its technical merits, which is where it needed to be decided all along.
6. Negotiated a partial restructuring rather than holding out for the whole fix. The buyer's tax counsel agreed the treaty argument had merit for a portion of the earn-out structure but pushed back on applying it fully, citing their own compliance preferences; we negotiated a compromise that reduced the withholding exposure on the majority of the earn-out value rather than losing the point entirely by insisting on all or nothing.
7. Documented the final mechanics precisely. Given how much of the dispute had turned on drafting detail rather than the underlying business terms, we made sure the final earn-out language left no ambiguity about how each payment would be characterized and routed, so the benefit negotiated could not quietly erode in implementation through an administrative choice made after closing by someone who had never been part of the negotiation.
8. Set up a verification mechanism for the first earn-out payment. Because the revised mechanics were new even to the buyer's own tax counsel, we built in a right for Daniela's advisors to review the calculation and withholding applied to the first payment before it was treated as a template for the remaining year, catching any implementation error early rather than after two years of payments had already gone out under a misapplied structure.

The outcome

The deal closed on close to the original schedule, with the earn-out's size and performance targets unchanged from what Daniela had negotiated herself. The withholding exposure was meaningfully reduced on the larger portion of the earn-out structure, which over the two-year earn-out period was expected to save Daniela and the firm's other shareholders a substantial amount compared to the original mechanics, though the buyer held its ground on applying the treaty-consistent treatment to the full structure, citing its own internal compliance preferences as the limiting factor rather than any weakness in the underlying technical argument.

Daniela did not get everything the modelling suggested was technically available to her. The remaining portion of the earn-out still carried some withholding drag that a more aggressive, longer fight might have reduced further, but pursuing that fight risked the closing delay the buyer had warned about from the start, and given the size of the deal relative to what remained on the table, Daniela decided the improvement already secured was worth taking rather than risking the whole transaction over the remaining gap. It was, in the end, her call to make, and she made it with a clear picture of exactly what she was leaving on the table rather than a vague sense of having compromised.

Katalin, who had been closest to the strained back-and-forth before we became involved, described the final outcome as the deal actually being fair rather than merely done. The earn-out payments began arriving on the revised schedule the following year, and the reduced withholding meant the actual cash reaching Daniela and her co-shareholders each year came noticeably closer to the number they had believed they were negotiating for at the start, even if it never fully closed the gap between what the mechanics had originally promised and what a treaty-optimized structure could theoretically have delivered.

The buyer's tax counsel, for their part, adopted the revised mechanics as something close to a template for future acquisitions involving Canadian sellers, which Daniela later heard about secondhand and took as a quiet form of vindication for the fight she had been reluctant to start.

What you can learn from this