Compensation Plan Design · Glossary

SPIFF vs Accelerator

An accelerator is a higher commission rate on revenue above a quota threshold — a permanent slope inside the plan that makes reps sell more. A SPIFF is a time-bound, behaviour-specific incentive — a spike outside the plan that makes reps sell something different. If reps coast after quota, you have a slope problem and need an accelerator. If nobody sells the new module, an accelerator just makes them sell more of the old one.

The confusion

Both pay a rep extra. Both are described as "incentives." Both get added to a plan when leadership wants more of something. And they are structurally opposite tools that solve different problems on different timescales — which is why using one where you needed the other reliably produces the wrong behaviour.

The short version: an accelerator rewards more. A SPIFF rewards different.

SPIFF vs accelerator

	{t('spiff','SPIFF')}	{t('accelerator','Accelerator')}
Triggered by	A specific behaviour or product, within a window	Attainment above a threshold
Time-bound?	Yes — that is the defining feature	No — it is a standing part of the plan
Form	Usually a flat amount per unit ($500 per deal)	A higher commission rate on incremental revenue
What it changes	What the rep sells	How much the rep sells
Where it lives	Outside the core plan, announced as a campaign	Inside the plan, in the {t('rate-table','rate table')}
Budgeted as	A campaign cost, capped and known	A variable cost, convex and unbounded
Fails when	It runs so often that reps wait for it	The threshold is unreachable

What this means?

An accelerator is a slope. A SPIFF is a spike. If your problem is "reps stop pushing once they hit quota," you need a steeper slope. If your problem is "nobody is selling the new module," a steeper slope will not help — the rep will simply sell more of what they already sell.

Two problems, two tools

Problem 1: "Our reps coast after 100%."

This is a slope problem. The plan pays the same rate at 140% as at 90%, so there is no reason to push. The tool is an accelerator: 10% up to quota, 15% above it. Now the marginal deal is worth 50% more, permanently, and the behaviour changes without a campaign.

Problem 2: "We launched a new product and nobody sells it."

This is a mix problem. Reps sell what they know how to sell. An accelerator makes them sell more — of the old product. The tool is a SPIFF: $1,000 per new-product deal closed in Q3. Time-bound, product-specific, and designed to break a habit rather than to steepen a curve.

The same $50,000, spent two ways

	Spent as an accelerator	Spent as a SPIFF
Mechanic	Rate rises from 10% to 15% above quota	$1,000 per deal on Product X, Q3 only
Who it reaches	Only reps who beat quota — roughly half the team	Every rep, including those below quota
Behaviour it drives	Push harder at the top end	Change what gets pitched, immediately
When it stops	Never — it is in the plan	End of Q3
Risk	Convex cost in a great year	Reps discount Product X to clear the SPIFF

Note the reach difference. An accelerator is invisible to a rep at 70% attainment — it is money they have already concluded they will not see. A SPIFF pays from the first deal, which is precisely why SPIFFs are the tool for moving a whole team rather than the top decile.

Why this matters for finance teams

They budget completely differently.

A SPIFF is capped and knowable: $1,000 × an expected 30 deals = $30,000, and you can cap the pool. It is a campaign line item.

An accelerator is convex and open-ended: it costs nothing in a bad year and disproportionately more in a great one, precisely when everyone is celebrating. A team at 130% attainment on a 1.5x accelerator does not cost 130% of the commission budget — it costs considerably more, and that is the single most common source of a sales comp expense overrun.

Common mistakes

1. Using a SPIFF to fix a structural problem

If reps coast after quota every quarter, that is a plan defect and a SPIFF is a monthly sticking plaster. Fix the accelerator.

2. Running SPIFFs continuously

A SPIFF that never ends is a rate change with extra administration — and worse, reps learn to hold deals back and wait for the next one.

3. Discounting to clear a SPIFF

A flat $1,000 per deal makes a small deal as valuable as a large one. Reps will find the smallest qualifying deal. Cap the SPIFF, or scale it with deal size.

How Visdum handles SPIFFs and accelerators

Visdum runs both as distinct plan components: an accelerator as a band in the rate table that fires automatically on attainment, and a SPIFF as a time-bound, condition-based component with its own start date, end date, eligibility, and cap. Because the SPIFF is a component rather than a spreadsheet run alongside the plan, it appears on the rep's statement as its own line during the window and disappears cleanly afterwards — and finance can see the SPIFF's actual spend against its cap in real time rather than discovering it at close.

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Frequently asked questions

What is the difference between a SPIFF and an accelerator?

An accelerator is a higher commission rate applied to revenue above a quota threshold — a standing part of the plan that rewards selling more. A SPIFF is a time-bound incentive paid for a specific behaviour or product, usually as a flat amount per deal, that rewards selling something different. One is a slope; the other is a spike.

When should you use a SPIFF instead of an accelerator?

When the problem is mix rather than volume. If a new product is not being sold, an accelerator will only make reps sell more of what they already sell. A SPIFF — say $1,000 per new-product deal closed this quarter — is designed to break a habit within a window. Accelerators change how much; SPIFFs change what.

Do SPIFFs reach reps below quota?

Yes, and that is one of their main advantages. An accelerator is effectively invisible to a rep at 70% attainment — it is money they have already concluded they will not reach. A SPIFF pays from the first qualifying deal, which is why it is the right tool for moving a whole team rather than the top decile.

Why are accelerators hard to budget?

Because they are convex. They cost nothing in a bad year and disproportionately more in a great one — a team at 130% attainment on a 1.5x accelerator costs considerably more than 130% of the commission budget. This is the single most common source of sales compensation expense overruns, and it happens in exactly the quarter everyone is celebrating.

What goes wrong with SPIFFs?

Two things. Run them continuously and reps learn to hold deals back and wait for the next one — the SPIFF becomes a rate change with extra administration. And a flat amount per deal makes a small qualifying deal as valuable as a large one, so reps will find the smallest one that qualifies. Cap the SPIFF or scale it with deal size.

Can you run a SPIFF and an accelerator at the same time?

Yes, and most companies do. They are separate plan components solving separate problems: the accelerator sits in the rate table and fires on attainment, while the SPIFF runs as a time-bound component with its own window, eligibility, and cap. Both should appear as their own lines on the rep's statement.