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  • Pay HMRC for "paying too little tax"

    I have had a letter from HMRC saying I owe money as I paid too little tax in the last tax year. The letter says HMRC will retrieve the money by increasing tax taken from my pension in the next tax year. However the leaflet enclosed (on P800 tax calculation) mentions this but also says that I can pay online, I'd rather just pay now but, if I do so, will it mean HMRC will NOT alter my tax code next year? And any advice on paying online please.