You’ll have to replace the 20% that was withheld with your own savings if you want to roll over your entire distribution to your Fidelity IRA—all within 60 days of receiving the distribution. If you do, the 20% that was withheld is credited toward your income tax liability when you file your tax return. However, if you don’t have the cash to make up for the 20% withheld, the IRS will consider that 20% as a distribution, making it subject to taxes and a possible 10% early withdrawal penalty if you are under age 59½.