Filing my deceased son's taxes using my turbotax account

Create a new account specifically for your son.  Do not use your account because you cannot prepare two returns under the same account for TurboTax Online. You can use the same password, just a new User name.

Once the account is established you will enter his income, deductions, credits, etc, just like you would for your own return. In the Personal Information section you must indicate your son, the taxpayer in this case, is deceased and enter a date of death.  Next, if there is a refund, then you will need Form 1310.  Can I file Form 1310 in TurboTax?

Be sure to select the appropriate selections 'Let's check for some other situations'