Hi,
Unfortunately, it is not possible to deduct tax from the State Pension at source even though it is taxable, as it is paid direct by the DWP to yourself gross. If any tax is due on it, we would adjust your PAYE tax code against any other taxable source of income to collect it at source. Unfortunatley, in some circumstances the PAYE income is not enough to collect what is due, and a simple assessment is created.
It maybe worth contacting our Income Tax team to discuss what tax code is in operation and what tax is being collected.
Income Tax: general enquiries
Thank you.