If your student loan is "NOT" in default, there will be "NO IMPACT" on your refund.
Since it was placed in forbearance, that indicates to me that you have been making your payments on time. It's been placed in forbearance to delay future payments without hurting you, is all. Make sure you understand the terms of the forbearance. For some, they only get to skip one payment. For others, they get to skip three payments with absolutely no impact on their credit or standing with the lender. But "READ THE TERMS" of the forbearance agreement. You very likely may have to pay those agreed upon missed payments sooner than you think.
For example, I got a 90 day forbearance on my mortgage for my Apr 1 payment. However, that Apr 1 payment is due and payable "IN FULL" by Aug 1st. If I don't make that payment by Aug 1st, then I"m late and will be assessed all allowed late fees. So when I make the August house payment, I must also make the April house payment by that time at the latest. That means my mortgate payment for August WILL BE DOUBLE.
So read the terms of your forbearance and "know" "the" "facts". Then if you have questions, contact the lender directly.