dan

I was in the same position to OP (choosing pay through my tax code and then later received a message from HMRC asking me to pay the tax before 31 January, even though I satisfied all conditions). I phoned the helpline and the helpful agent confirmed that there was a mistake on the system, he then corrected it so that my tax would be collected via PAYE, and I can now see my self assessment accoutn shows nothing outstanding. I would have been fined by HRMC if this hadn't happened even though it was their error, so if anybody else is in this situation I urge you to contact them and not assume it will get collected by PAYE! Details on https://www.gov.uk/government/organisations/hm-revenue-customs/contact/self-assessment