How to view PAYE Notice of Coding online

HMRC Admin 5 - that response doesn't give the answer that we are looking for. We are not looking for our Tax Codes, we are looking for the 'Underpaid tax included in PAYE coding' from our PAYE Notice of Coding. Coding notices only seem to be available under the 'Business tax account' section, which is completely illogical, as many have pointed out. However, when I look under this section, I have no coding notices apparently (even though I am not on the normal tax code) so I guess I'll have to spend an hour on hold trying to find this information out, as there is no apparent way to locate this ourselves...

Hi,
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Thank you

My thanks to Jason Tax - I've had exactly the same problem this year (because, I suspect, I never received a notice). I've spent a long time getting to this point but you have saved me much more (and my sanity).