As reported last year by the Telegraph –
Five million people may have been billed incorrectly by HMRC.
You’ll find your tax code on:
- your pay slip
- your PAYE Coding Notice – you usually get this a couple of months before the start of the tax year and you may also get one if something has changed but not everyone needs to get one
- form P60 – you get this at the end of each tax year
- form P45 – you get this when you leave a job
Among those most likely to be affected are veterans who have taken a civilian job after leaving the Armed Forces, but who also draw a military pension. Pensioners with two pensions and those who have continued to work part-time after retirement are also more likely to be hit.
Taxpayers, who must complete their self-assessment tax returns before Jan 31, are being warned to check their paperwork again to make sure they are not affected.
Problems arise because various tax offices around Britain are failing to share information about taxpayers’ incomes on a central database.
People with more than one income, whether from pensions, PAYE employment or a mixture of the two, are being allocated their personal tax-free allowance multiple times. It means the tax codes issued for their various income sources are incorrect, so not enough tax is taken. Often the mistakes are discovered by HMRC years later, leading to unexpected tax demands. Telegraph
If you think your Tax Code is wrong you should tell HMRC as soon as possible using online form P2
You can check how your tax using this HMRC link
The most common tax code for tax year 2015 to 2016 is 1060L (£10,600 being the annual income tax free allowance for 2015/16) – in 2014 to 2015 it was 1000L. It’s used for most people born after 5 April 1938 with one job and no untaxed income, unpaid tax or taxable benefits (eg company car).