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Earned Income Credit is awarded based on the bell curve. If your income is $0 you receive $0 in credit. As your income goes up, your credit amount goes up until you reach the peak of the bell curve, then as your income continues to go up your credit will go down. With income of just under $48,000 you are close to the bottom of the downside of the curve where the credit phases out. This is why you are not receiving the Maximum credit that someone who is married with 2 children can receive.
