See if there is an oval red seal in the middle of the invoice, with the words "National Unified Invoice Producer Seal" on it and the words "Local Taxation Bureau Producer" or "State Taxation Bureau Producer" below. And the abbreviation and name of the place where the invoice is located.
See if there is an official seal of the seller below. If not, it is an invalid invoice.
Appraisal method of professional tools:
Identify with a special identification pen for infrared laser.
The "national unified invoice producer seal" above the invoice can display yellow-green highlights under the excitation of the infrared laser special identification pen; The scratches on the back of the invoice will also appear purple.
Query identification method:
Telephone inquiry mode.
There are "invoice code" and "invoice number" in the middle of the invoice, and some have "password" when issuing the bid. You can call the local tax authorities to check the authenticity of the invoice, and enter the "Invoice Code", "Invoice Number" and "Password" for inquiry.
On-line query method.
You can find the official website of the local tax authorities on the Internet, find the item of "invoice inquiry", and enter the "invoice code" and "invoice number" in it, so you can easily see when and what company the invoice was used, which is convenient and fast. If it is a fake invoice, it can't be found online.
Check with the local tax authorities.
You can also take your invoice, go to your local tax authorities and show it to them for identification. You can also take your invoice there to receive the prize, killing two birds with one stone, hehe.