Marriage Allowance tax transfer

MollyMoon

I saw Martins advice about claiming the marriage allowance by transferring some of my allowance to my husband as I don't pay tax and he does. Both pensioners. I wrote to HMRC to enquire about it as I couldn't provide the ID proof online.
Out of the blue yesterday hubby had an HMRC refund of tax letter with a cheque attached for overpayment of tax. Lovely we thought until the arrival of 7 separate letters from HMRC today. 
4 were for me each saying that I owed the taxman a total of  almost £700.   Wasn't expecting that. We don't have access to any financial advice. Anyone have any ideas? If I had known that this would be the outcome I would not have bothered at all! 

sheramber

Although you didn't pay tax you have not had the full amount of free personal allowances that were transferred, so you now become liable for tax. 

                        e.g personal allowance £12,500

                                                     income £12,000   - you don't  pay tax

                    marriage allowance transfer  10% X 12,500 = 1250

             adjusted personal allowance now 12500- 1250 = 11250

                                                         income 12, 000 - 11,250 = 750  now chargeable to tax.

  How much refund did your husband get?    Was it more than the £700 that you are now due pay so that as a couple you are better off.