To determine whether or not at least 90 percent of the tax was "paid" on or before the due date, the aggregate amount of tax credits applicable on the return, plus the tax payments made on or before the due date, are divided by the tax required to be shown due on the return. The tax required to be shown on the return is the sum of the income tax and minimum tax. The tax credits applicable are the credits set out in Iowa Code chapter 422, division II, and section 422.111.
If the aggregate of the tax credits and the tax payments are equal to or greater than 90 percent of the tax required to be shown due, the taxpayer will have met the "90 percent" test and no penalty will be assessed. However, the taxpayer will still be subject to statutory interest on any tax due when the return is filed.
Any tax elections, such as the election to carry forward a net operating loss occurring in the tax year, will be considered to be valid in instances when the return is filed within the six-month extended period after the due date. The fact that the taxpayer has paid less than 90 percent of the tax required to be shown due will not invalidate any tax elections made on the return, if the return is filed within the six-month extended period.
This rule is intended to implement Iowa Code section 422.13.
Iowa Admin. Code r. 701-48.9