If you normally have 10000/yr in taxes taken out by the feds from your paychecks and at tax time you owe $0 you could change your dependents on your W4 and the feds will take less in taxes from each check. So instead of taking 10000/yr they take 2500. You would still owe for the xtra 7500 but...
Yes as of now the 7500 is a credit not a refund but that could change. However if you don’t have a large tax bill you can adjust your withholding on your W-4 by claiming more dependants which lowers how much tax they take from your check. For example if you usually have to pay 1000 at tax time...