Contact HMRC online at .uk/married-couples-allowance, by telephone on 0300 200 3300 or by post to HM Revenue and Customs. BX9 1AS.
Individuals are subject to a system of independent taxation so spouses and civil partners are taxed separately. This can give rise to valuable tax planning opportunities. Furthermore, the tax position of any children is important.
Go to .uk and search for 'Marriage Allowance circumstances change'. You can backdate your claim for up to 4 tax years that you were eligible for Marriage Allowance. Your partner's tax bill will be reduced for the years you're backdating. You can claim for the current tax year and up to the last 4 tax years.
How long does marriage allowance take to process or receive? It can take up to two months for any marriage allowance claims to go through, as HMRC needs to process each claimant's tax code in order for the refund to be issued.