The steps of issuing an invoice for trade union funds in the electronic tax bureau are as follows:

1. Log in to the electronic tax bureau, enter the page where I want to pay taxes, and select tax declaration and payment.

2. Continue to choose non-tax income declaration, and click on the tax union funds.

3. Enter the reporting period and click OK.

4. Open the trade union funds declaration form to fill in the page, correctly enter the invoice amount and the number of employees, and click on the formal declaration.