Under the Gift Aid scheme, RNIB can reclaim approximately £0.28 extra from the UK tax authorities for every £1.00 donated by UK income tax payers.
By checking the Please Gift Aid My Donation box on the sponsor form, you are making a declaration to RNIB that you are a UK tax payer and would like your donation, all donations you have made to RNIB for the six years prior to this year, and all donations you make in the future (until you notify RNIB otherwise) to be treated as Gift Aid donations.
In order for RNIB to claim the Gift Aid on your donation, your name and address must be passed to the tax authorities for verification.
Please note that tax can only be reclaimed on donations made by individuals who pay UK income or capital gains tax at least equal to the amount reclaimed on their donations in the current tax year.
The Gift Aid scheme is unique to the UK. If you are not a UK taxpayer, you can still make a donation, but your donation is not eligible for Gift Aid.
For more information, refer to the RNIB Gift Aid FAQ or the official HMRC Gift Aid Overview.