Retirement tax questions

Hi IreneS

I'm just completing my taxes for 2019 and reside in the UK thus my social secuirty payments should be be taxed by the IRS - I've followed this guide as best I can (entering my total SS income as I guess it's all taxable ?) and it results in box 5b being set to zero (as I would expect) but it also reduces my total income by the same amount .  Schedule 1 Part 1 line 8 shows the negative amount of social security wiping out my other UK government pension I receive.

It doesn't appear in line 21 (in fact the overview doesn't show line 21 anyway)  - any idea where I've messed up ?

 

Regards Tim