Our insurance company requires us to require our subs to carry worker's comp insurance, and they audit us yearly. If we choose to work with a sub that does not carry worker's comp, we have a form that we require the sub to sign in which they agree to an 11% "admin fee" for every invoice to cover the fine that we will incur from our insurance company when the invoice shows up in our audit. For instance, if I have a $100 invoice but the sub does not carry worker's comp, I will deduct $11 as an admin fee. If the sub signed a lien waiver with $100 on it, do I now have exposure or does the signed 11% admin fee agreement cover us? Also, what happens if I take a backcharge or an early-payment discount against the invoice? Thank you.