Chancellor George Osborne has played down plans to limit tax relief for charitable giving.
Osborne said the plan announced in last month's Budget would not be rushed in and that he would work with charities and donors to find a way to protect their income.
It is feared the change, if implemented, could result in a drop in donations from wealthy benefactors.
"I want to sit down with the charities, get it right and make sure they get protected," he told the BBC.
"I think the principle that however rich you are, you pay income tax is protected."
Mr Osborne admitted the Budget proposal had caused "a rush of headlines", but said he had always been planning to have a period of consultation.
"I announced in the Budget the principle - I didn't actually publish a load of detailed legislation and ask Parliament to vote on it immediately," he told the Today programme.
"I said: 'Let's take 12 months to get this right'. I know in the first few weeks it's caused a rush of headlines but good tax making takes time and that's what I want to do."
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