Employment for Minor

Hello!

I have a newly formed LLC. My wife also has an LLC for her book publishing.

 

We have a Roth IRA for my (now 4 yr old) daughter. We would like to employ her in both of our businesses and pay her, so she can contribute to the Roth IRA.

 

Can you please give or point us to the relevant info on how to do that?

 

Thank you!