This is a statement I make to my retiring clients. Most people have a 401(k) or 403(b) that they save while working. You may like the funds you have in those accounts, but when you retire, you should roll them over to an IRA. Here are the reasons why:
If you need to take a withdrawal the minimum tax withholding from a company account is 20%. Most people are not in a 20% tax bracket when they are retired. You will be giving money to the Government interest free until next year when you get a refund.
Your former plan may make changes that you will find out after the fact. Those changes, especially to the funds available, may not be to your liking.
The internal expenses are generally higher than investing outside of a company retirement plan.
Take your money with you when you retire.
Disclosures: