What is the main tax benefit of a Roth IRA and 401K?
The main tax benefit of a Roth IRA and 401K is that realized gains from selling investments within the accounts are not taxed.
Instruction: What is the main tax benefit of a Roth IRA and 401K?
Context: 
Response: The main tax benefit of a Roth IRA and 401K is that realized gains from selling investments within the accounts are not taxed.