@mrbillyo
You cannot compare the Social Security Benefits Worksheet in TurboTax to the worksheet in the IRS instructions. Some of the lines are different because they work differently in the way they handle certain less-common situations.
In particular, you cannot compare line 3 on the two worksheets. Line 3 on the TurboTax worksheet includes Form 1040 line 2a. Line 3 on the IRS worksheet does not include line 2a.
Before you go any further, read the Exception in the instructions for Lines 6a and 6b in the center column on page 30 of the Form 1040 instructions. If any of the situations listed under "Exception" apply to you, you cannot use the Social Security Benefits Worksheet in the Form 1040 instructions. Instead, you have to use a worksheet in either IRS Publication 590-A or IRS Publication 915. TurboTax incorporates some of the Exception conditions into its worksheet, which is one reason that it differs from the worksheet in the Form 1040 instructions.
Do any of the Exception conditions in the IRS instructions apply to you?
Also, please clarify whether you are using TurboTax Online or the CD/Download TurboTax software.
