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First Quarter 2026 IRS Interest Rates on Overpayment & Underpayment of Tax

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On November 13, 2025, the IRS announced that the First Quarter 2026 IRS interest rates on overpayment and underpayment of tax will not change from the Fourth Quarter of 2025.

This means that, the First Quarter 2026 IRS interest rates will be as follows:

seven (7) percent for overpayments (seven (7) percent in the case of a corporation);
seven (7) percent for underpayments;
nine (9) percent for large corporate underpayments; and
four and a half (4.5) percent for the portion of corporate overpayment exceeding $10,000.

How the IRS Calculated First Quarter 2026 IRS Interest Rates

The IRS calculates the IRS interest rates based on specific tax provisions. We begin with the Internal Revenue Code (“IRC”) §6621, which establishes the IRS interest rates on overpayments and underpayments of tax. Under §6621(a)(1), the overpayment rate is the sum of the federal short-term rate plus 3 percentage points for individuals and 2 percentage points in cases of a corporation. There is an exception to this rule: with respect to a corporate overpayment of tax exceeding $10,000 for a taxable period of time, the rate is the sum of the federal short-term rate plus one-half of a percentage point.

Additionally, under §6621(a)(2), the underpayment rate is the sum of the federal short-term rate plus 3 percentage points. Similarly to overpayments, there is an exception for a large corporate underpayment: in such cases, §6621(c) requires the underpayment rate to be the sum of the relevant federal short-term rate plus 5 percentage points. Also, the readers should see §6621(c) and §301.6621-3 of the Regulations on Procedure and Administration for the definition of a large corporate underpayment and for the rules for determining the applicable date.

Finally, pursuant to the IRC §6621(b)(1), the IRS computed the First Quarter 2026 IRS interest rates based on federal short-term rates in October of 2025.

Importance of the First Quarter 2026 IRS Interest Rates

The IRS interest rates are relevant for a great variety of purposes. Let’s highlight three of its most important uses. Firstly, these rates will determine the interest a taxpayer will get on any IRS refunds.

Second, the IRS and the taxpayers use these rates to calculate the interest on any additional US tax liability on amended or audited tax returns. This also applies to the amended (and, in case of SFOP, original) tax returns that the taxpayers submit pursuant to Streamlined Domestic Offshore Procedures and Streamlined Foreign Offshore Procedures.

Finally, the First Quarter 2026 IRS interest rates will be used to calculate PFIC interest on any relevant §1291 PFIC tax. This PFIC interest will be reported on the relevant Form 8621 and ultimately Form 1040.

We at Sherayzen Law Office constantly deal with the IRS interest rates on overpayments and underpayments of tax. This is why we closely follow any changes in these IRS interest rates.

EU Automatic Exchange of Banking and Beneficial Ownership Data Approved

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On November 22, 2016, the European Parliament approved the automatic exchange of banking and beneficial ownership data across the European Union. The directive received an overwhelming support from the Parliament: 590 members voted “yes”, 32 – “no”, and 64 did not vote.

Since the original proposal was already approved by the EU Council on November 8, 2016, the only issue left before the directive will come into force will be the final adoption of the directive by EU Council. Once the directive on the automatic exchange of banking and beneficial ownership data is adopted by the Council, the member states will have until December 31, 2017, to implement it.

The directive represents a major undertaking with respect to the automatic exchange of banking and beneficial ownership data. Once it is adopted, the directive will allow tax authorities of every EU member state to automatically share the banking information such as account balances, interest income and dividends. Moreover, the directive also requires the EU member states to create registers recording the beneficial ownership of companies and trusts. This means that the tax authorities of all EU member states will finally acquire access to the information regarding the true beneficiaries of foreign trusts and opaque corporate structures.

The idea behind the new legislation on the automatic exchanges of banking and beneficial ownership data is to provide the EU member states with tools to fight cross-border fraud and tax evasion, preserving the integrity of their domestic tax systems.

However, it appears that there are still serious implementation issues with respect to the new directive. The most serious problem is that the directive merely allows the automatic exchange of banking and beneficial ownership date in the EU, but it does not obligate the member states to do so. Furthermore, the banking industry’s role in the facilitation of tax evasion is not addressed at all by the legislature.

After the directive on the automatic exchange of banking and beneficial ownership date is adopted, the European Parliament is going to take up the legislation to provide for a cross-border method for accessing the shared information.

An interesting question for US taxpayers is whether any of the information acquired through the EU sharing mechanism will be shared with the IRS through FATCA. The likelihood of this scenario is fairly strong and may further expose noncompliant US taxpayers to IRS detection.