- 90% of market sales and 10% of income-producing activity sales for taxable years beginning in 2015;
- 95% of market sales and 5% of income-producing activity sales for taxable years beginning in 2016; and
- 100% of market sales for taxable years beginning after 2016.
The election must be made on the taxpayer's timely filed original income tax return. The election will be effective retroactively for the full taxable year of the income tax return on which the election is made and binding on the taxpayer for at least five consecutive taxable years (regardless of whether the taxpayer no longer meets the percentage threshold of a multistate service provider during that time period, unless the election is properly terminated). To continue with the election after the five consecutive taxable years, the taxpayer must meet the qualifications to be considered a multistate service provider and renew the election for another five consecutive taxable years. The election may be terminated during the election period either (1) on the acquisition or merger of the taxpayer, or (2) with the permission of the Department of Revenue.