When you check that box, the program computes the maximum amount to contribute for the best tax break.
If the refund changes, I would assume the program is computing a higher amount to contribute.
Follow the interview to see how much the program suggests you contribute and make that by April 15th if you want to take advantage of the contribution.
If this is a SEP, you can file for extension which would give you more time to make the contribution (extensions do not work this way for IRA's)
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