Now that my top rate of income tax is a whopping 50%, will I get tax relief at that rate if I make charitable donations in this tax year?
Yes. If you make donations to charities under the gift aid scheme you will get tax relief at the 50% rate. Your gift is treated as being made after 20% tax has been deducted. When you give £80 the gross amount of the gift is £100. Your personal thresholds for 40% tax and 50% tax are both extended by the gross amount of your donation. For your £80 gift you have an extra £100 of your income taxed at 20% rather than 40%, and an extra £100 of income taxed at 40% rather than 50%. In total you have gained tax relief of 50% (20% +20% +10%) on the £100 gross gift.