2016 program will not let me file using the taxable amount of social security from 2015 file. How do I correct this?

[p1219crockett]

Why won't the 2016 program allow me to e-file using the amount of taxable social security shown on the 2015 return?  What does the LSE before line 20a indicate?

[Anita01 · Accepted solution]

The LSE indicates you received a lump sum for prior years in your social security payments for 2015.  To e-file, you need to use the Adjusted Gross Income from your 2015 return, not just the taxable social security.