Steve Adams....
https://www.mlbtraderumors.com/2019/02/a-closer-look-at-the-red-sox-and-the-luxury-tax.html
Here is part of the article
If the Sox were to pay Kimbrel a $17.5MM annual salary, the first $4,703,803 of that salary would close the gap between Boston’s current “actual” payroll and the $246MM threshold. As noted above, that’d come with a $1,986,937 luxury hit, coming to a total of $6,690,740. The remaining $12,769,197 would come with a hefty tax of $9,576,898. That’s a total of $11.564MM just in taxes before considering the money the team would actually owe to Kimbrel himself.
Viewed through that lens, Boston would effectively be on the hook for a stunning $29,036,835 in 2019 if they were to sign Kimbrel at the record rate he’s quite likely eyeing. (A multi-year deal, of course, might have greater or lesser salaries in its various seasons, though that’s all averaged for the CBT.) Frankly, even beyond any concerns about lengthy commitment to a not-so-youthful reliever, it’s pretty clear to see why the Sox don’t have much interest in retaining Kimbrel unless his price tag craters (at which point a plethora of other teams would join the bidding). Though the total luxury tax bill would still not make up an enormous amount of the team’s total payroll-related spending, it would perhaps turn a Kimbrel signing from a hefty investment to an eye-popping splurge.
That math is also informative when examining why the Sox have passed over other top-end relievers. For instance, beating the Yankees’ three-year, $27MM offer to Adam Ottavino by a margin of $500K annually would’ve still been costly for Boston. As with any contract, the first $4,703,803 of the deal would’ve been taxed at $1,986,937. The remaining $4,796,197 would come with a $3,597,148. In total, signing Ottavino at a $9.5MM annual salary would effectively cost $15.084MM in 2019.