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Married Couples Allowance (MCA) is an amount that is taken off your tax bill - so it only applies if you pay tax. If you don't pay tax, or if your tax bill isn't high enough to use up all of your MCA, you can transfer any unused allowance to your spouse or civil partner if they pay tax.If you are married and living together and at least one spouse was born before 6 April 1935, the husband can claim MCA. HM Revenue & Customs (HMRC) reduces your tax bill by 10 per cent of the MCA to which you're entitled.
The problem here arises where the spouse of the person claiming MCA passes away, and either their state pension alone, or with other personal pensions exceeds the Personal Allowance for income tax (currently £10,660 for those qualifying for MCA). In most circumstances HMRC will update their records correctly and remove the MCA from the surviving spouses tax code in the following year, but I have seen a number of cases where this is not done. The result is that the surviving spouse continues to benefit from MCA, and so doesn't pay the correct income tax. Now, although this is a HMRC error, they will still ask you to pay the tax due as it is your responsibility to challenge anything that may be wrong. So, if your spouse (or civil partner) has recently passed away and you were in receipt of MCA, get it checked out!

Both of these problems are easily remedied (usually over the phone these days), so don't worry about them, but do take action.