The answer above is just to inform the other party of the current situation, but there is a problem. Once it rises to 17%, the total contract price will increase if the income remains unchanged. If you follow the previous contract price Implementation will cause you to pay more taxes and reduce your income accordingly. For the customer, it means that he will have to pay you more now. If this matter is handled by the sales department, then the answer of the colleague upstairs will be corrected with a few typos. That’s it. If you are the one to contact us, you should explain it clearly in the letter. Of course, if the prices signed by you and the customer are all tax-exclusive, you only need to pay in one lump sum.