Is lump sum SS payment taxable in payment year or in year for which it was paid?
I started receiving SS in 2019. There was a lump sum payment followed my monthly payments. The SSA 1099 says that a $$ portion of the lump sum payment was "for 2018". Can I file an amended tax return for 2018 and report that $$ portion of the lump sum payment in that year instead of 2019?