by JRG on Thu Jan 26, 2012 1:46 am
From your response I'm assuming your 'approx. £9,900' is your Gross Pension for 2010-11, in which case the Income Tax of £672 will be correct.
The figures on the reverse of your 2010-11 P60 show the gross amount you will be paid in 2011-12.
If your Gross Pension is £10,161.45, and your Personal Allowance is £7,475, then your Taxable Pension is £2,686 (ignoring the pence) and the Income Tax payable is £537.20. For each month you should get a Gross Pension of £846.79 and pay Income Tax of £44.80. In some months the figures may be slightly different, to agree with the annual totals.
You should ask both HMRC, and your Civil Service pension provider, why the Tax Code is being changed for 2012-13. Usually, the BR Tax Code is applied to a second employment, or to a pension if still in employment. If the BR Tax Code is applied, you will have to reclaim overpaid Income Tax from HMRC.