Taxpayer asks if she can make one payment (50% of balance due) by electronic payment and 50% of balance due in 30 days. She has been informed that interest will be charged on outstanding balance after May 17th. How can this be set up in ProConnect?
The simple answer is no, the e-file system is not a bank that accepts installments. You can schedule estimated tax payments for the future year, but the prior year tax allows for 1 payment.
You have advised your client that the tax is due, and delaying results in P&I. You could make the payment thing work by filing for an extension, paying the 50% with the extension payment. Then come back later and file the return with the second 50% payment. While not recommended, this is a potential workaround.