It sounds like your tax return has some items that use nontaxable income when calculating a credit. This happens with some credits. See 5 Things You Should Know about Refundable Tax Credits. Have you checked your return before and after adding the income to see what is actually changing?
Do a print preview before and after so you can compare side by side. The nontaxable income can also be used to calculate sales tax for those in the US.
@mm1232
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