Less than 500 yuan: I can apply for tax exemption with a copy of my ID card, only once a month.

Above 500 to below 1000: just hold a copy of the payee's ID card.

/kloc-above 0/000: hold a copy of the payee's ID card; A copy of the payer's tax registration certificate or institution code certificate; Proof of payment with stamp issued by the payer or a copy of the labor contract signed by both parties.

You have to pay it when the tax is invoiced.