I promised that I will write how to get rid of problems connected with mistakes in IFTA forms. There are many methods and each of them has got its own advantages. You can hire a special employee, but it is an expensive option. You can also pay a lot to other firms and they will prepare documents for you. I think that the most comfortable and cheap opportunity is to find some help in the web. There are many cheap websites that can calculate the amount of tax for you.