The system, not the actual care provided.
The employer pays the Workers Compensation premium. Where I live the WC is run by the Govt as
you cannot trust something this sensitive to private insurers who care more for profits and shareholders than your health.
My WC premium is under 2% of gross payroll as we have not had a claim.
Over here if the principal supply under contract is labor (regardless if you own business) you are covered by WC.
For example, climber is predominantly labor supply, he physically has to do the work so he will fall under the boss's WC. However, contractor supplies chipper and bobcat ... that's different as the predominant supply is machinery.
If you are in doubt you can ring them or fill in a survey for the various things and they make judgement if the contractor is under your WC or not.
With workers on average being 1/3 of the business overheads it's important to keep the costs associated of employing people in check, premiums like you guys have quoted around the board of 50% and 70% on top of wages is frankly ridiculous. You'd either not hire or not pay insurance or pay workers cash under the table etc.
Over here a few years back there was a deluge of workers placed into contractor rolls as employers thought the contractor was responsible for their own WC. Consequently many of the contractors didn't have WC but their jobs continued the same as before, however this was wrong and not even a loop hole just ignorance on the employers behalf. The govt made sure it was common knowledge that where labour is the supply then you have to pay the WC.
When everyone is paying the WC then not only is everyone covered but the pool of money is higher placing less stress onto business overheads as premiums are lower.
Now lets go one step further for the argumentative.
You then set yourself up as a company and become an employee. You get to pay a low 2% for your WC on yourself and have benefits that leave a private insurer in the dust. When I tried to privately insure as a self employed the premium was 10% with crappy cover and waiting periods and hospital bills not covered ... that's another policy.
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Also, if for some reason some-one ended up like the guy who started this thread the WC would pay and fine/persue the business owner ... the worker gets what they should have rightfully had in the first place, it's not the workers fault the boss is a lier and cheat.