If you're a broker, what happens to commissions in your account?

[Bri]

Got a 401k plan sponsored by a brokerage house.

Everyone's got their own account. Sometimes commissions on stock trades are going directly to the participant as agent of record (that's a no-no). Sometimes the commission goes directly to the firm (also a no-no).

Question is, what can we do with commissions generated? Keep them in the participants' accounts so that no outside income is generated?

[Guest JimJ]

Quite the conundrum…

Ask the sponsor to turn off commissions for their own plan.

Typically there are fees associated with recordkeeping (including trading) and administration of qualified DC plans. I do not see the conflict with the commissions (I am assuming this is the trading cost in a self directed account) being charged if they are reasonable.