Here in CA, the usury limit is 10% so that would be the max I could pay my 401k plan.Bruce M - You are correct, you can not loan money to yourself from your self directed IRA, however, we are discussing 401k plans (self administered) and these plans have borrwoing provisions, which are one of several reasons why self directed 401k plans are better than SDIRA's.Most 401k plans (both self directed and standard company provided plans) offer borrowing provisions and are limited to a max loan of $50k or 50% of your vested interest.

6) Have the note administered by a loan servicer.7) Have borrower pay the setup fee and monthly servicing fee for loan servicer?

Can be a major painI would be careful when doing this. much more administative intensive.

This is a simple deal.You as the custodian of your self administered 401k can invest in notes (which is what you are doing here).

There is no reason to have multiple accounts, created with the sole purpose to act as a "firewall" for your operating account.... unless... you don't mind paying for and administering it and that's what you want to do.

The only thing that's different is if you have a claim, the claim is administered by Olympus.  

Lead attorney waiting for "closing order" from I.R.S.Trust is worth $4.5 million ( going to have pull file on this one).The attorney's representing these clients also represent new clients (Notice to Administer Estate) and existing (past clients) and as I research probate files, I notice certain attorney's name keep coming up.

Contemplating administering a tenant survey for a newly acquired property to see what the tenant needs are (to be taken with a grain of salt...).

I have a Solo K too and choose to administer my own money.  

They have an annuity income, secured by a property they know well.Do not pay more for the property for financing, financing does not add value to a property.Search for loan servicing and select a servicer to administer the loan.