- The IRS charges underpayment interest on unpaid tax, penalties, additions to tax, or interest from the due date until paid in full, even with an extension or payment plan.
- Interest is automatically reduced only when the related tax or penalty is corrected or abated; reasonable cause and first-time abatement do not qualify for interest relief.
- Interest relief requires proof of unreasonable error or delay by an IRS officer or employee and is requested using Form 843.
- Reducing or removing a penalty causes the related interest to be automatically reduced or removed.
For background on this issue, read our Penalty relief guide.
Core Differences Between Penalty Relief and Interest Relief
Penalty relief is available for certain penalties when a taxpayer tried to comply with the law but could not due to circumstances beyond their control. Eligible penalties include failure to file, failure to pay, accuracy-related, failure to deposit, and underpayment of estimated tax.
The IRS offers first-time penalty abatement, reasonable cause relief, administrative waiver, or statutory exceptions depending on the situation. Requests can often be made by phone using the number on a notice, or in writing with Form 843.
Interest relief operates under different standards. The IRS charges underpayment interest on any unpaid liability including tax, penalties, additions to tax, or interest. This interest begins on the due date of the return for tax and varies by penalty type. It continues to accrue daily even if an extension is filed or an installment agreement is in place.
Republic Tax Relief provides private tax-resolution services for individuals and businesses with IRS or state tax issues. Readers with existing tax-debt questions may contact the firm for its advertised free, no-obligation initial consultation to discuss suitability, scope, fees, and availability of help communicating with the IRS.
When Interest Can Be Reduced or Removed
Interest is automatically reduced or removed when the underlying tax or penalty amount is corrected through an amended return or when penalty relief is granted. However, the IRS does not remove or reduce interest for reasonable cause or as first-time relief.
The only other basis for interest abatement is when interest resulted from an unreasonable error or delay by an IRS officer or employee. In such cases, taxpayers may submit Form 843 or a signed letter requesting adjustment.
Overpayment interest paid by the IRS on refunds follows separate timing rules but is not the focus of relief requests in underpayment situations.
Practical Implications and Next Steps
Because interest continues to increase the total amount owed until the balance is paid in full, reducing penalties alone does not stop interest from accruing on the remaining liability. Paying as much as possible immediately and entering a payment plan can limit further growth but will not eliminate daily interest.
Taxpayers should review any notice for accuracy, correct errors where possible, and address the underlying tax or penalty first. To dispute interest, documentation supporting the request must be provided within the required time limits.
Interest rates are set quarterly and prior periods are not affected by later rate changes. Understanding these distinctions helps set realistic expectations when managing a tax liability.
IRS guidance checked .
General information only, not individual tax, legal, or financial advice. Rules, deadlines, and eligibility depend on your circumstances. Check current official guidance or consult a qualified professional.
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