The EIC curve is shaped like a triangle, it starts at zero and as you earn more money the EIC increases, up to a point where the curve turns down again and once your income is above that point, the more you earn the less EIC you get until when you get to the EIC maximum income, your EIC is zero. So, your additional $14,000 in income put you over the top of the EIC curve and on to the down side where as you earn more, you get less EIC.