What Does the IRS Actually Charge If You File a Tax Extension?

Mark J Kohler
Mark J KohlerApr 12, 2026

Why It Matters

Understanding IRS interest and penalty rates helps businesses and individuals avoid unexpected costs, preserving cash flow and financial health.

Key Takeaways

  • IRS charges interest on unpaid taxes after filing an extension.
  • Interest rate is roughly 7% annually, about 0.5% monthly.
  • Late‑payment penalty adds another 0.5% per month on balances.
  • A $1,000 balance due in July costs about $50 total.
  • Paying early avoids interest, penalties, and reduces stress.

Summary

The video explains what the Internal Revenue Service actually charges when a taxpayer files for an extension but does not pay the owed amount by the April deadline. It breaks down the two separate costs the IRS imposes: interest on the unpaid balance and a late‑payment penalty.

Interest is set quarterly and for the current year sits at roughly 7% per annum, which translates to about half a percent each month. In parallel, the penalty for late payment also accrues at approximately 0.5% per month. Together, these charges compound the amount owed beyond the original tax liability.

Using a $1,000 example, the presenter shows that waiting until July to pay would generate roughly $30 in interest and $20 in penalties, totaling about $50 extra. The calculation illustrates how even modest delays can add up quickly, underscoring the financial impact of postponing payment.

The takeaway for viewers is clear: settling tax liabilities promptly, even after filing an extension, avoids unnecessary costs and reduces the stress associated with looming penalties. It also highlights the value of consulting a qualified accountant to identify possible deductions and manage cash flow efficiently.

Original Description

This video clarifies the IRS penalty and interest calculations for unpaid taxes. We detail a penalty of 0.5% per month and an approximate annual interest rate of 7% on outstanding amounts, explaining common "tax penalties" and "irs penalties". Learn how these charges apply to your "income tax" and how to avoid them with smart "tax tips" to manage potential "irs back taxes".
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