deed of covenant

noun

1. 付款契据（承诺定期捐款的契约，受款人可兼获为此款所应缴的税额）
   an agreement to pay a regular amount of money to sb/sth, especially a charity, that means that they also receive the tax that would have to be paid on this money
   1. Signing a deed of covenant makes £1 worth £1.33.
      签署一张付款契据就使1英镑价值变为1.33英镑。