The main purpose of e-invoice is for buyers to claim tax relief. Buyers must request e-invoice from sellers if the transaction is eligible for tax relief. Hence, the details required on e-invoice are more detailed than a normal invoice, which include buyers’ TIN number, IC number and others.
If the expenses is not for tax relief (e.g. daily expenses), then the buyer is not required to request e-invoice.

电子发票需要的资料共有51项，被分为9大类，详情可查看图片
大家可以这样理解，电子发票对于买家唯一的用途就是扣税。如果买家需要这笔交易作为扣税的项目，就需要向商家索要电子发票，因此电子发票上也有一些内容与传统发票不一样，如：
电子发票需要有纳税人IC号码或者纳税人的税务号码，以及一些个人详情，而传统发票则不需要
若您这笔开销是不需要作为扣税用途的（例如日常生活开销）则可以不需要索取电子发票。