All income received in a tax year from all sources is reported on one single tax return. From that total income your tax liability is determined. If what was with held and/or paid in to the IRS during the year exceeds your tax liability, the IRS issues ***ONE*** payment to return the tax over payment to you.
If what was with held and/or paid in to the IRS is less than your tax liability, then you owe the IRS the difference that is paid with "ONE" billed payment to the IRS.
