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Received correction notice from IRS re taxable social security benefits as Turbo Tax had miscalulated the amount by over $20000.  As a result I received a refund!

 

TT Form 1040 L6 (SS Benefits WS )L3 showed $46502 instead of $26102.

TT instructions for L3 was adding amounts on Form 1040 lines 1 (wages) =$0, 2a,3b,4b,5b,7 and sched 1 L9. Total of which is $26102 NOT $46502 as calculated by TT.  

I tried overiding L3 and the bottom line /refund then agreed with IRS as well as my calculator. How could TT make such a mistake??