I received a lump sum payment in 2019. My SSA-1099 broke it down by year as to the amount of payment relating to each year. The lump sum amount for 2015 was $3384
In 2015 my AGI was $66,334. My Social Security amount in Box 5 was 7703. Taxable Social Security that year was $20,647. The 2019 tax return will not accept the 20,647. What am I missing?
