If you are self-employed, your personal income tax return is overdue. When you go to the tax hall to make a supplementary report, you need to fill out two forms. Just fill them out and send them to the competent tax bureau.
If you don’t know how to fill it out, you can ask a professional accountant.
If you hire someone to do this for you and fill out these two forms, it usually costs 50 yuan. If you meet someone who is easy to talk to, it will be free of charge. If you do it every month, it will only cost 100-200 yuan per month.