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Ask a sales rep what's driving their next paycheck, and you'll often hear all three words used interchangeably: SPIFF, bonus, and commission. They get lumped together as "extra money for selling," but they're not the same thing, and treating them like they are leads to confused reps, inconsistent payouts, and comp plans nobody can actually explain.

A SPIFF is a short-term, targeted incentive. A bonus is a lump-sum reward tied to hitting a broader goal. A commission is the ongoing, formula-based pay tied directly to sales, the core of most sales comp plans, not an add-on to it.

This guide breaks down what each one actually means, when companies use them, how they're calculated, and how they stack together so you can build a comp plan where every payout has a clear reason behind it.