In case if you get any error messages when filing returns, you need to make amends to your return. This is where the amendment filing services come to the fore. Usually, the IRS will correct the errors and may receive and accept the returns without specific forms or schedules. If this is the case, you are not required to adjust the tax returns. But, if there is an alteration in the filing status, credits or deductions, you should file an amendment return. For claiming the refund, you have to file Form 1040X within 3 years from the date you have submitted your original returns. In some cases, the returns that are filed within two years after the date you have paid taxes are also considered filed.