I've received a P800 today stating I've underpaid tax for tax year 2017/2018
I was made redundant due to company insolvency in this time and received two payments form the insolvency service, one for unpaid wages and one for pay in lieu of notice. HMRC have the payment for unpaid wages on twice under income, and the tax due on this duplicated amount is equal to the amount they think i have underpaid tax for.
The pay in lieu of notice is not listed, and looking at the letter from the insolvency service no tax was deducted from this amount. Googling suggest the rules around this changed in April 2018? Am i correct in assuming that at the time I was paid this was not taxable which is why it isn't listed?