Get your taxes done using TurboTax

Can you please expand a bit on what “tax bill” means?  When I file my taxes I usually owe very little or get a small refund because what was withheld is close to my federal tax liability.  If the tax credit for installing solar panels is approximately $15,000 can that be applied to my federal tax liability which is around $55,000? In other words, will the credit reduce my tax liability to around $40,000 and I will get the over withholding back as a refund? Thanks.