Anyone else done this? I'm usually the highest earner by quite a margin so I submit the self assessment to pay our child benefit higher earner charge. Submitted then realised DH's taxable income was slightly higher last year! HMRC said I should amend and DH will need to register. Is amending a pain? It looks like I will need to wait 72 hours. I don't have other income other than salary so shouldn't have extra tax to pay myself this year.