IRS Form 8888 Allocation of Refund (including Savings Bond Purchases) is used by taxpayers who want their refunds to be deposited into more than one account or used to purchase U.S. Series I Savings Bonds.
Reasons you may not split your refund into more than one account in TaxAct:
Per IRS Instructions for Form 8888, on page 2:
Your entire deposit may be deposited in one account. . If there are any delays in the processing of your return by the IRS, your entire refund will be deposited in the first account listed on Form 8888. Make sure the first account you list on Form 8888 is an account you would want the entire refund deposited in if this happens.
In TaxAct, the information for completing Form 8888 is entered during the filing process and the form will automatically be generated by the program if it is applicable to the return.
Note. In an effort to combat fraud and identity theft, new IRS procedures effective January 2015 will limit the number of refunds electronically deposited into a single financial account or pre-paid debit card to three. The fourth and subsequent refunds automatically will convert to a paper refund check and be mailed to the taxpayer.
Note that any link in the information above is updated each year automatically and will take you to the most recent version of the document at the time it is accessed.