403b self-directed brokerage accounts (SDBAs) allow you to transfer a specified amount of your 403b investment dollars to an outside broker for investment in a large array of alternative mutual funds  

Taxable mutual funds are offered in the Schwab self-directed brokerage window for each provider shown below.

403b SDBA
Corebridge EmpowerHorace MannVoya
888-393-7272 800-677-2363 
Yearly Fees  (Other fees may apply)
$50 $50$100$50
Core Account Minimum Balance Requirement
$0$500$500$500
Transfer Amount Minimums
No minimumsInitial - $500
Subsequent - $1
Initial - $1,000
Subsequent - $500
Initial - $500
Subsequent - $1