(3) For all tax years beginning on or after January 1, 2025, in the form of a bonus from the National Guard or a reserve component of the United States Armed Forces for joining, reenlisting, or for any other reason; and to the extent that such income is included in the federal adjusted gross income, may be deducted from the taxpayer's Missouri adjusted gross income to determine such taxpayer's Missouri taxable income. If such person files a combined return with a spouse, a percentage of any military income received while engaging in the performance of National Guard or reserve military duty may be deducted from their Missouri combined adjusted gross income. Such military income shall be deducted as follows:
(a) For the tax year beginning on or after January 1, 2020, twenty percent of such military income;(b) For the tax year beginning on or after January 1, 2021, forty percent of such military income;(c) For the tax year beginning on or after January 1, 2022, sixty percent of such income;(d) For the tax year beginning on or after January 1, 2023, eighty percent of such income;(e) For all tax years beginning on January 1, 2024, and thereafter, one hundred percent of such income.