How should you run spiffs for HVAC and plumbing techs?

A spiff (sometimes written SPIF) is a fixed reward paid to a tech for selling or attaching one specific item during a defined window.

It pays per event: sell the maintenance agreement, earn the spiff; attach the accessory, earn the spiff.

When the promotion ends, the spiff ends — that temporary span is what separates it from the standing plan.

Three features define one.

It is narrow — a single product or behaviour, not the whole ticket.

It is temporary — a window with a start and an end, not a permanent feature of the plan.

And it sits on top of the pay plan: a spiff does not replace hourly pay, flat rate or commission; it rides alongside whatever base you already run.

The four base structures are compared in our guide to the HVAC technician pay plan.

That is also the difference between a spiff and commission.

Commission is standing pay calculated on the revenue a tech generates — a percentage of total sales, sales above a specified amount, or some other formula, in the regulation's own words (29 CFR 778.117) — and it is part of the plan, not a nudge.

A spiff is a fixed amount on a named item, and the point is to move one number for a limited window, then stop.

A bonus tied to results over a period is broader still; of the three, a spiff is the narrowest — which is exactly why it needs the guardrails below.

Point a spiff at a behaviour you can verify on the ticket, that carries margin behind it, and that needs a push.

In HVAC and plumbing service work, three behaviours fit those tests: maintenance-agreement sales, accessory and add-on attaches, and qualified replacement leads a tech writes up for the sales side.

Each is countable at the ticket level, and the reward is meant to be funded from the margin the item itself carries — which is where the sizing below starts.

Size the amount from your own margin, not from a benchmark.

Our research found no primary source — government or credential body — that publishes spiff amounts; the figures that circulate come from consultants or paywalled member surveys, which we cannot verify.

And another shop's number reflects their margins, not yours.

The arithmetic that holds up: start from the gross margin on the item, decide the slice you are willing to trade for the behaviour, and set one fixed dollar amount per valid sale.

A fixed amount also keeps the promise legible — a tech knows exactly what the next agreement is worth, which a percentage hides.

Set the window and the payout like the rest of payroll.

A spiff should run long enough to measure and short enough to stay special: name the start date, the end date, the cap and the payout date before the first ticket closes.

Write down what counts as a valid sale, too — a spiff on maintenance agreements dies on paper if cancelled agreements still pay out, so define the event (signed, completed, not cancelled inside the window) and pay after it clears.

The failure mode is built into the design: pay per event and the incentive runs toward manufacturing events.

Where the reward rides on ticket size rather than on a named, defensible item, the pitch drifts from "here is what your system needs" toward "here is what pays me."

So weigh each reward design against where an oversell would cost you — your reviews and your repeat business — not against the tech's paycheck.

The guardrails that keep a spiff honest:

• Pay on items you would defend to the customer. A spiff on a maintenance agreement or a genuinely protective accessory survives scrutiny; a spiff riding the ticket total invites the upsell you cannot defend.
• Cap the exposure. A per-tech or per-window cap bounds both the payout and the pressure — once a tech hits the cap, the incentive to stretch a pitch is gone for the rest of the window.
• Watch the same window for damage. Track callbacks, declined-work complaints and review sentiment while the promotion runs; a spiff that lifts attach rates while callbacks rise is costing more than it pays.
• Sunset it. The window is the design, not a formality. A spiff that quietly becomes permanent has stopped steering and started distorting the paycheck — at which point it belongs in the standing plan, priced and reviewed like one.

One more source of overselling is the hire itself: a spiff can amplify a selling habit a tech already has.

If overselling survives the guardrails above, treat it as a screening problem too — see our guide to hiring HVAC and plumbing techs.

Assume they do until your employment attorney says otherwise.

Two rules under the Fair Labor Standards Act (FLSA), which the U.S. Department of Labor enforces, cover the shapes a spiff takes.

Where a spiff pays on sales — a percentage of the ticket or of what it adds — the commission rule reaches it: commissions, whether based on a percentage of total sales, of sales in excess of a specified amount, or on some other formula, are payments for hours worked and must be included in the regular rate, whether or not they are the employee's only pay (29 CFR 778.117).

Where a spiff is a fixed reward per item, announced in advance, it is promise-shaped pay: a bonus is discretionary (and left out of the overtime math) only when the employer decides both whether to pay and how much at or near the end of the period, with no prior promise — so an announced spiff plan is not a discretionary bonus, and bonuses count in the overtime regular rate unless they fit one of the FLSA's listed exclusions, such as gifts on special occasions, while bonuses announced to make employees work faster are among those that must be included (29 CFR 778.208, 778.211).

Either way, the safe working assumption is that the spiff rides in the regular rate with everything else — and the week's overtime math runs on the base plan plus the spiff, not on the base alone.

The base plan underneath does not change that.

Whether your techs are hourly or flat-rate, the overtime duty follows the paycheck unless a specific exemption applies: flat-rate (per-job) pay does not remove FLSA overtime — for job-rate workers the regular rate is total job pay divided by hours actually worked, plus an extra half-time for each hour over 40 in a workweek (29 CFR 778.112).

On that working assumption, a spiff on top adds to the regular rate rather than sitting outside it.

The narrow exit our research covers is the FLSA's section 7(i) exemption, and every one of its tests has to hold at once: the employer must be a "retail or service establishment," meaning one where 75% of annual dollar sales of goods or services is not for resale and is recognized as retail in that industry; the employee's regular rate must be more than 1.5 times the minimum wage; and more than half of the employee's pay over a representative period of at least one month must be commissions.

On the retail question, HVAC and plumbing shops should assume nothing: in May 2020 the Department of Labor withdrew 29 CFR 779.317 — the list of businesses said to lack a "retail concept," which courts had read as specifically carving out air-conditioning contractors — and whether a service company qualifies for 7(i) today is decided case by case.

The full regular-rate arithmetic, including how bonuses and deferred commissions are allocated across pay periods, is on our guide to overtime for flat-rate and commissioned techs.

This page is employer career and business information, not legal advice. How spiff pay is treated at overtime depends on your pay mix and your establishment — confirm the plan with an employment attorney or the Department of Labor's Wage and Hour Division before it goes live.