Sec. 1. 36 MRSA §5122, sub-§2, śM, as amended by PL 2003, c. 391, §5, is further amended to read:

M. For each individual who is a primary recipient of benefits under an employee retirement plan, an amount that is the lesser of:

(1) Six thousand dollars reduced by the total amount of the individual's social security benefits and railroad retirement benefits paid by the United States, but not less than $0. The following amounts reduced by the total amount of the individual's social security benefits and railroad retirement benefits paid by the United States, but not less than $0, for each tax year beginning in the following years, except that this reduction does not apply to benefits paid under a military retirement plan; or:

(a)__2005, $8,000;

(b)__2006, $9,000;

(c)__2007, $10,000;

(d)__2008, $11,000;

(e)__2009, $12,000;

(f)__2010, $13,000;

(g)__2011, $14,000;

(h)__2012, $15,000;

(i)__2013, $16,000;

(j)__2014, $17,000; and

(k)__2015, $20,000.

For tax years beginning January 1, 2016, the deduction under this subparagraph is equal to the amount of the maximum social security benefit reduced by the total amount of social__security benefits and railroad retirement benefits actually received by the taxpayer, but not less than $0.__The State Tax Assessor by September 15th of each year shall determine the amount of the deduction and incorporate the change, if any,