The State of Missouri uses a different rate for refunds due to amended returns than for refunds due to other reasons. When a refund is calculated for the State of Missouri, Instant Interest displays the following prompt:

If you select “Yes” Instant Interest will use a set rate of 6% to calculate interest on the refund, rather than the rate in the table you see on the View screen. If you select “No” Instant Interest will use the published rate.