Its asking about distributions made after 2017. Distributions made after 2017 and before the due date of your tax return if not rolled over or converted to Roth reduce the amount of new contributions that are eligible to be considered when calculating this credit. This is to avoid one getting the credit for simply taking out the retirement money just to use it to make a new contribution and get a credit without actually increasing retirement savings.
Any distributions you make in the prior three years reduces the amount of the Saver's Credit.
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