Demonstration:

Personal income certificate

XXX (ID card number XXXXXXX) is an employee of our unit whose annual (monthly) income is RMB XXXX (capital letters) yuan

Hereby prove it!

Name of work unit

Year, month and day

That’s fine, that’s how I opened it

But now most banks don’t look at this. Your monthly payment is coordinated and all you need is your ID card (work badge).