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As it may help others, via the phone just managed to figure it out and makes sense - and most definitely I was not the only person with this discrepancy:
The Covid working from home expenses for 2021/2022 were claimed via another form that then resulted in change of tax code - this needs to be shown in expenses in the SA form, too! I imagined it all gets combined somehow behind the scenes, but it is not the case.
Thus, SA form has to include this expense and then things will fall in line.
Indeed, so as listed, there were other things included in code - so if those were my codes as per taxcoding notices, why does now SA calculation consider default 12570?
It is very puzzling, and it then leads to apparent underpayment despite having only PAYE tax deductions as per the issued codes.
I tried a few times to see if it recalculates the above, but it is adamant that my personal allowance for last year was the default 12570, which is not accurate (as mentioned, tax code was higher and then changed to even higher temporarily).
Once I submit, would it realise what my actual tax codes thus personal allowances were during 2021/2022?
Thank you for any thoughts - as this is the only thing stopping me from submitting SA.
Something puzzling on my SA 'view your full calculation' page: my tax code was 1357L then 1388L (due to Covid work-from-home expenses claimed toward the end of the tax year)... but the calculation page shows the following: "minus Personal Allowance £12,570.00"
This 1. does not match my personal allowance as per above, 2. thus results in unexpected tax due.
Will this somehow update itself after SA is submitted and would it take into account what my actual personal allowances were during that year?
Thank you in advance for any help in understanding this discrepancy.
Thank you for confirming, I shall file amended 2020/2021 first and then a bit later the 2021/2022 s hopefully the changes propagate through the system in chronological order.
Thankfully toward the end of 2021 I realised (quite late) about this and claimed for the 2021/2022 year so tax code was adjusted for that already.
Just to reconfirm, apologies, as I am currently filling in 2021/2022 SA: I can only claim the Covid work from home allowance for 2020/2021 if I amend the 2020/2021 SA return in the "other" expenses box?
And importantly, once this amendment is done *and* in near future the 2021/2022 SA is filed, calculations will result in adjustment taking into account all previously made payments etc. ?
As currently it results in figures that are as if no payment had been made since 2020/2021 SA...
Many thanks in advance.