In Idaho, part-time, seasonal, and occasional workers all count toward the workers compensation requirement from the very first hire. There is no minimum number of hours and no waiting period, so a single steady part-timer makes coverage mandatory just as a full-time employee would, and the policy has to be in force before that person starts (Idaho Code 72-301).
Who this is for: Idaho owners whose only staff are part-time, seasonal, weekend, or on-call workers, and who wonder whether that is enough to trigger the rule.
The short version
- Part-time counts. Idaho does not set an hours minimum, so a part-time or weekend worker triggers the duty like a full-timer.
- Seasonal and occasional count too. Idaho names seasonal and occasional workers in its coverage rule, so a spring-only or holiday crew is covered.
- Coverage attaches on day one. A part-timer is covered from their first shift; there is no grace period to reach.
- Casual work outside your trade is the narrow exception. Truly casual, incidental work that is not part of your usual trade or business can be excepted.
- The number of hours does not set the duty, though it does affect the payroll your price is based on.
How part-time and casual differ in Idaho
People mix up two different ideas. A regular part-time worker, even one who works a few hours a week, is an employee and counts. The narrow carve-out is for casual employment, which Idaho defines as occasional or incidental work that is not in the usual course of your trade or business. A weekend barista at your cafe is not casual, because serving customers is the usual course of your business. Someone you pay once to repair a sign at your office may be casual, because sign repair is not what your business does. The table shows how the common cases land.
| Worker | Triggers the coverage duty? | Why |
|---|---|---|
| Weekend or evening part-timer in your line of work | Yes | Regular part-time work in your trade counts, with no hours minimum |
| Seasonal crew you rehire each year | Yes | Seasonal work is named in the coverage rule |
| On-call or occasional worker in your trade | Yes | Occasional workers in your usual business count |
| A one-time repair unrelated to your business | Usually no | Genuinely casual work outside your trade can be excepted |
| A household domestic worker in a private home | Usually no | Household domestic service is a separate carve-out |
Why part-timers still need real coverage
A part-time worker can be hurt just as badly as a full-time one, and the medical bill does not shrink because the shift was short. Idaho comp pays the medical costs and part of the lost wages for a covered part-timer, which keeps a slip or a strain from turning into a fight over who pays. Because the duty attaches at the first part-time hire, the safe move is to have the policy in force before the first shift. We rate the policy on your actual part-time payroll, so you are not charged as if everyone were full-time.
A Boise example
Illustrative, not a quote. A Boise gift shop has only two part-time clerks who each work about 15 hours a week. Even though no one is full-time and the total hours are modest, Idaho requires a policy, because both part-timers work in the usual course of the business and there is no hours minimum. The owner puts coverage in place before the first shift, and when a clerk strains her back moving stock, comp handles the medical bill. See our workers comp for retail stores page.
Real questions Idaho owners ask
Do part-time employees need workers comp in Idaho?
Yes. Idaho has no hours minimum, so a regular part-time worker triggers the coverage duty from the first hire, and the policy must be in force before that person starts.
Do seasonal or occasional workers count in Idaho?
Yes. Idaho names seasonal and occasional workers in its coverage rule, so a spring-only crew or an on-call worker in your trade counts the same as a full-time employee.
How many part-time hours trigger workers comp in Idaho?
There is no hours threshold. Even a worker who puts in a few hours a week counts if the work is part of your usual trade or business. The duty is about being an employee, not about hours.
What is the casual-work exception in Idaho?
Casual employment is occasional or incidental work that is not in the usual course of your trade or business. A one-time repair unrelated to what your business does may be casual, but a regular part-timer in your line of work is not.
Is a weekend worker at my shop casual?
No. A weekend worker doing your normal work, like serving customers or stocking shelves, is a regular part-time employee, not casual. Casual means work outside the usual course of your business.
Does coverage start right away for a part-timer?
Yes. A part-time employee is covered from their first shift once your business is subject. There is no waiting period, so the policy should be in force before they start.
Will I be charged as if my part-timers were full-time?
No. Workers comp is priced on actual payroll, so part-time wages are rated as part-time. We make sure your policy reflects real hours so you are not overcharged.
Why Idaho owners choose Morrow
- We shop the right market for you. In Idaho you can buy workers' comp from any of the hundreds of private insurers licensed here, or from the state-chartered Idaho State Insurance Fund, which competes right alongside them. That lets us shop your rate widely, and if your work is too risky for any of them, there's a state-backed fallback plan that still has to cover you.
- We catch pricing mistakes. Your price depends heavily on the category your work falls into for pricing (the class code). Put people in the wrong category and you overpay for years. We review your payroll and classifications before you buy.
- Proof of coverage, fast. Need a certificate (proof of coverage) for a general contractor or a landlord before Monday? We turn those around the same business day for most carriers.
- We help lower the score that drives your price. Insurers give you a score based on your past claims that raises or lowers your cost (the experience modification rate). We review it each year, flag errors, and connect you with return-to-work and safety resources that bring it down.
- Real people when a claim happens. When someone gets hurt, we stay involved through the life of the claim, not just at renewal.
Related Idaho guides
Every Idaho business is set up a little differently. These companion guides answer the same question for other situations, plus the national explainers behind the terms used here.
- Business insurance in Idaho (start here)
- Workers comp: the owner's overview
- I own an LLC: do I need workers comp?
- I'm a sole proprietor: do I need workers comp?
- I own a corporation (C-corp or S-corp): do I need it?
- We're a partnership: do we need workers comp?
- We're a nonprofit: do we need workers comp?
- My workers are 1099: do I still need it?
- I only employ family: do I need workers comp?
- Remote or out-of-state staff: do I need coverage?
- What happens if I don't carry workers comp?
- How much does workers comp cost?
- How do I get workers comp (even if turned down)?
- What insurance do I need for a contractor license?
- Workers compensation insurance, explained
- What workers comp costs (national guide)
- Hiring your first employee: what changes
- What workers comp does not cover
- Idaho retail workers comp
This guide is general information, not legal advice. Idaho rules and penalty amounts can change, so verify current requirements with the Idaho Industrial Commission or a licensed advisor before you rely on them. Last updated: July 2026.