Overtime and Your Workers' Comp Premium: The Straight-Time Rule

Workers' comp premium is based on payroll, and payroll includes overtime pay — but not all of it. The premium (excess) portion of overtime — the extra half in time-and-a-half — is generally excluded from the payroll basis used to calculate premium, provided your payroll records show overtime separately from straight-time pay. For any business that runs meaningful overtime, this single rule can be worth real money, and it's one of the easier corrections to make because it's pure arithmetic once you have the right records.

The rule in plain terms

Think of a hypothetical employee paid $20 an hour straight time and $30 an hour for overtime hours (time-and-a-half). The theory behind the exclusion is that the added risk of an extra hour of work doesn't scale with the extra pay for that hour — the exposure is roughly the same whether that hour is paid at $20 or $30. So the payroll basis for premium purposes uses the straight-time equivalent: every hour worked, valued at the regular rate, rather than the inflated overtime rate. The $10 "premium" portion of each overtime hour is excluded from what premium gets charged against.

A worked example

Say an employee works 2,200 hours in a year: 2,000 at a straight-time rate of $20/hour and 200 hours of overtime paid at $30/hour (time-and-a-half). Total gross wages come to $46,000 (2,000 × $20, plus 200 × $30). The straight-time-equivalent payroll basis instead values all 2,200 hours at the $20 regular rate — $44,000 — excluding the $2,000 of overtime premium ($10 extra × 200 hours) from what premium is calculated against. On its own, $2,000 of excluded payroll is a modest adjustment; the effect compounds when it's applied across an entire overtime-heavy crew, at a high-rated class code, every single audit period.

A note on double time and other premium pay

The same general principle — that the basis reflects straight-time-equivalent compensation rather than premium pay — is commonly applied to double-time pay and similar premium arrangements too, not just standard time-and-a-half overtime. Exactly how holiday pay, shift differentials, and other premium arrangements are treated can vary by state and carrier, so if your payroll includes those categories in meaningful amounts, it's worth asking your carrier directly how each one is treated rather than assuming the standard overtime rule covers all of them identically.

Why this rule sometimes surprises business owners

Unlike classification questions, which usually involve some element of judgment about what an employee actually does, the overtime exclusion is close to pure mechanics — apply the rule to the numbers and the answer follows. That's exactly why it's surprising how often it's missed: it's not a hard call anyone is avoiding, it's a detail that depends entirely on which payroll report happened to get handed over, and nobody thought to ask whether a more detailed version existed.

Where this adds up fastest

The dollar impact of this rule scales with two things: how much overtime a workforce actually works, and how expensive the underlying class code is. It shows up hardest in overtime-heavy trades — a roofing crew (code 5551) working long hours through storm season, a trucking operation (code 7219) running extended routes, or a restaurant (code 9082) staffing through a busy season. In each of these, overtime pay can represent a meaningful share of total payroll during peak periods, and the gap between charging gross wages and charging the straight-time equivalent compounds with the code's rate.

The recordkeeping requirement

This exclusion only works if your payroll records actually separate straight-time pay from overtime pay. A payroll system or general ledger that just shows total gross wages per pay period, with no breakdown of regular versus overtime hours, gives an auditor nothing to work with — the full gross figure gets used as the payroll basis by default, and the overtime premium goes uncredited. Most payroll software already tracks this distinction internally; the issue is usually whether that detail actually makes it into the reports handed to the auditor, not whether it exists at all.

Why it gets missed even with good records

The overtime exclusion isn't automatic — it only applies when the payroll reports actually handed to the auditor show the breakdown. A business can have perfectly good overtime records inside its payroll system and still get charged full gross wages, simply because the report exported for the audit was a single total-wages column. This is worth confirming specifically before an audit rather than assuming your payroll provider's standard report already does it — ask whether the export can be run with regular and overtime hours and pay broken out separately, and provide that version instead of a summary total.

Seasonal businesses feel this the most

Businesses with a sharp seasonal peak — landscaping in spring, roofing after storms, restaurants around holidays — often concentrate almost all of their overtime into a few months rather than spreading it evenly across the year. If your payroll reports are only reviewed in aggregate for the full policy period, that seasonal concentration can get smoothed over in a way that obscures how much overtime premium is actually embedded in the annual total. Pulling overtime figures monthly, at least for your peak season, can make the exclusion easier to verify and easier to defend.

What to hand the auditor

If you run any meaningful overtime, ask specifically whether the audit is using gross payroll or a straight-time-adjusted figure, and provide payroll reports that break out regular hours, overtime hours, and the corresponding pay for each — not just a combined total. If the auditor's work papers show gross wages with no separate overtime line, that's worth flagging before you sign off on the results, not after.

If it was missed on a past audit

If you find that a prior audit charged full gross payroll without excluding the overtime premium, and your payroll records from that period do show the overtime breakdown, this is a straightforward recomputation to raise with your carrier — provide the records and ask for the payroll basis to be corrected. It's one of the more mechanical disputes to make, since it doesn't turn on a judgment call about duties or classification, just arithmetic on records you likely already have. Our general walkthrough on how to dispute a workers' comp audit covers how to raise this kind of correction.

Salaried and non-hourly employees

This rule is most straightforward for hourly employees, where straight-time and overtime rates are explicit line items. Salaried employees who receive overtime pay under wage-and- hour rules (which varies by role and by state and federal classification) present a less mechanical calculation, since the straight-time equivalent has to be derived rather than read directly off a pay stub. If a meaningful share of your payroll is salaried employees who also earn overtime, it's worth asking your payroll provider or accountant how that translates into a straight-time-equivalent figure before you present it to an auditor.

It compounds with other payroll issues

Overtime treatment is one piece of a bigger payroll-accuracy picture that also includes which class code each hour of work belongs to in the first place — see our guide on payroll splitting between class codes for the records that support a split, and the seven most expensive class code mistakes for how this fits alongside the other common overcharges we see at audit.