SPIF vs. SPIFF: Which sales term is correct and what’s the difference?
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What Is a SPIFF? SPIFF is simply a variant spelling of SPIF, but the meaning is the same. The spelling “SPIFF” has gained popularity in some industries (especially in retail and tech), but SPIF remains the more correct, formal acronym since it represents Sales Performance Incentive Fund.
Spiff - Wikipedia
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A spiff, or spiv, is slang for an immediate bonus for a sale. Typically, spiffs are paid, either by a manufacturer or employer, directly to a salesperson for selling a specific product.
SPIFF Definition & Meaning - Merriam-Webster
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Smarten up and spiff up both mean to improve in appearance often by making more neat or stylish ("the tailor smartened up the suit with minor alterations"; "he needed some time to spiff himself up for the party").