The IRS Interest Rate Hike: What It Means for You and Your Business


The Internal Revenue Service (IRS) has recently announced an interest rate increase effective from October 1, 2023. This decision will have a ripple effect across various sectors, impacting everyone from individual taxpayers to small businesses, corporations, CPAs, and accountants. Let’s delve into the specifics of this announcement and understand its implications.

The New Rates

The IRS has set the following rates for the upcoming calendar quarter:

  • Individuals: 8% per year (compounded daily) for both overpayments and underpayments.
  • Corporations: 7% for overpayments and 8% for underpayments. However, there’s a 5.5% rate for the portion of a corporate overpayment that exceeds $10,000 and a 10% rate for large corporate underpayments.

These rates are determined based on the federal short-term rate, which is adjusted quarterly. For most taxpayers, the overpayment and underpayment rate is the federal short-term rate plus 3 percentage points. Corporations have a slightly different calculation, with the underpayment rate being the federal short-term rate plus 3 percentage points, and the overpayment rate being the federal short-term rate plus 2 percentage points. Large corporate underpayments have an added rate of the federal short-term rate plus 5 percentage points.

Implications for Different Sectors

Small Businesses

    • Small businesses that have made an overpayment, as defined by the IRS, can expect a return at an 8% interest rate. This could be beneficial for businesses that have made excess payments.
    • On the flip side, businesses that have underpaid will face an 8% interest rate, which could strain their finances if they have significant underpayments.


    • Corporations that have made an overpayment, as per the IRS definition, stand to benefit from a 7% interest rate. However, for overpayments exceeding $10,000, the rate drops to 5.5%.
    • Large corporations need to be particularly cautious about underpayments. A hefty 10% interest rate on large corporate underpayments can lead to substantial financial implications.

CPAs and Accountants

    • The new rates mean that CPAs and accountants will need to update their financial models and advise their clients accordingly.
    • It’s crucial for them to ensure that their clients are aware of these changes to avoid any surprises during the tax season.


    • For individual taxpayers, the 8% interest rate applies to both overpayments, as defined by the IRS, and underpayments. This means that while they can expect a decent return on overpayments, they should be wary of underpaying their taxes.


The IRS’s decision to hike interest rates is a significant one, and its impact will be felt across the board. Whether you’re an individual taxpayer, a small business owner, or a large corporation, it’s essential to be aware of these changes and plan your finances accordingly. For CPAs and accountants, staying updated with these rates is crucial to provide accurate advice to clients. As always, when in doubt, it’s a good idea to consult with a financial advisor or tax professional to understand the best course of action for your specific situation.

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