Limiting participation in Individually Directed Accounts within a 401(k)

[Guest GoldenBear03]

I understand that, while all participants have to be given the right to open an IDA inside of plans that allow for them, there are certain restrictions, such as asset level that can keep participants from opening an outside brokerage account. For instance, I have heard of plans requiring participants to have at least a $25,000 account balance in order to open an account. Is there a maximum on this minimum account balance requirement?

What other types of restrictions can a plan sponsor place on IDA's?

Thanks in advance!

[WDIK]

A plan could be designed to limit the amounts available for participant directed investments by contribution type, by vesting or other criteria. It is also possible that under some circumstances, such limitations could be deemed to be discriminatory.