Hi,
Your State Pension is taxable, but does not count towards the threshold for paying into your pension scheme to qualify for tax relief. The threshold is set at the lower of your employment income or £60000. Where there is no employment income, the threshold is limited to £3600. The following guidance advises "contributions can be paid after a member has reached the age of 75, they are not relievable pension contributions and cannot qualify for tax relief".
Contributions qualifying for tax relief
Thank you.