The two structures are not economically equivalent, and the difference lands on the employee. Paid up front with a repayment clause, the money is in the employee's account immediately, and leaving early triggers an obligation to pay some or all of it back. Paid on the target date and forfeited if the employee leaves, nothing changes hands until the end. Employers often prefer the first because it feels like a gift rather than a hostage arrangement; employees usually do better under the second, because a forfeited payment costs nothing but a repayment obligation is a debt. The awkwardness of repaying money that was taxed when received, and recovering the tax separately, is covered on the signing bonus entry, where the same mechanic applies.
Where these appear tells you something. They cluster around three situations: a merger or acquisition, where the buyer needs the seller's people through integration; a wind-down or relocation, where the employer needs someone to keep the lights on while their own job disappears; and a project or implementation with a hard completion date. In the first two, the bonus is often a signal rather than a reward. An employee offered a large sum to stay through a date, with nothing said about what happens after it, has been told something about the date.
The wage-and-hour consequence is real and widely missed. For an employee who is not exempt from overtime, a bonus promised in advance for staying is not discretionary within the meaning of the Fair Labor Standards Act, because, as the regulation puts it, "if the employer promises in advance to pay a bonus, he has abandoned his discretion with regard to it." A non-discretionary bonus must be included in the regular rate on which overtime is computed for the period it covers, which means overtime worked during that period was underpaid at the time and has to be recomputed. The published overtime pay entry works that arithmetic; the point here is only that the obligation exists.
Labels genuinely do not decide it, in both directions. Paragraph (d) of the same regulation says the label assigned to a bonus "does not conclusively determine whether a bonus is discretionary," and that what matters is whether both the fact and the amount were left to the employer's sole discretion until at or near the end of the period, with no prior contract, agreement or promise causing the employee to expect it. So calling something a discretionary appreciation payment does not make it one if it was promised, and an unannounced payment made after the fact to someone who stayed through a difficult stretch can still be discretionary. The regulation's own list of payments that may be discretionary includes severance bonuses and bonuses for overcoming challenging or stressful situations.
What the employee is actually being asked to price. The honest question is not whether the number is large but what is being given up to collect it: the months during which another employer is hiring, the option to leave on good terms before a reorganization, and in a repayment structure, the exposure to owing money back if circumstances change. A retention agreement rarely promises that the job survives the date, and it is worth reading for whether an involuntary termination before the date still forfeits the payment, since in many agreements it does not.
