Article 59 When conducting tax inspection, the personnel sent by the tax authorities shall produce the tax inspection certificate and the tax inspection notice, and have the responsibility to keep secrets for the inspected; If the tax inspection certificate and tax inspection notice are not produced, the inspected person has the right to refuse the inspection.
Therefore, it is not necessary to bring a work permit, because a work permit and an inspection certificate are two different things. But the inspection certificate and inspection notice must be brought.
Because there are laws.
If you are on a business trip, you can show your work permit and letter of introduction to other departments and systems to handle affairs and coordinate your work.