The U.S. IRS has published Program Manager Technical Advice 2018-016 addressing an overpayment of an installment of Section 965 Tax where there is still an overall Section 965 Tax due.  In this case, the PMTA reasons that when a taxpayer overpays an installment amount, it doesn't mean that the taxpayer has made an overpayment. Code Section 965 provides for a one-time transition tax that the Taxpayer can pay in installments over 8 years by making an installment election under Section 965h.  If a Taxpayer overpays an installment -- but an overall Section 965 tax liability still exists - the excess amount paid...