Tell me you don’t understand tax write offs without telling me 101 right there.
You don't get to use donations to write off tax on a different £ of income that you haven't donated.
An SA100 form is pretty easy to understand.
Whatever marginal tax rate is, say 20% for the sake of argument, if I donate £100 i would get back £20 (net cost of £80). That does not leave me better off than not donating where I get to keep the net of tax money. It is simply the tax going to the charity instead.
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