"Tax managers are responsible for managing and reporting taxes, ensuring that an organization is compliant with all applicable tax laws. Tax managers must be up to date on all regulations and have a thorough knowledge of their client's financials. Interviews generally focus on behavioral questions and your past experience, though be prepared for specific tax questions as well."
Imagine you make a very complicated calculation in excel for a client who is going to make a decision. After you reviewed it a couple of times you notice you are going to save the client $10 million in taxes. You give it to your senior and your partner, who review your work. They agree on your calculation and tell the client about the tax savings and the meeting to finalize the transaction is tomorrow. It's 9 o'clock at night and you are finalizing the paperwork, and you suddenly realize you made a careless mistake on excel and instead of putting a minus, you put a plus, so the client is not going to save $10 million, but is going to owe $10 million. What do you do? How do you handle the situation?
Answer: Everyone makes mistakes and you have to acknowledge it in a humble way. Tell the senior or the partner of the mistake as soon as possible, so they can help you minimize the damage.
Firstly, tell your partner and senior about it. After that, finalize the paperwork and bring it to your client's house. Talk to your client and just tell your client that you've made a mistake and tell your client the correct info
Start looking for a new job as soon as possible.