That will depend on how your plan is written. Normally plans provide a cashout within 90 days if the account balance is less than a fixed amount (for example $3,500). If the balance is over the threshold amount, the account should remain open until the ex-employee closes it. The account can continue to grow in value through gain in share price or decrease in value due to same. The open account will continue to be included in the bank's re-purchase liability calculations.