IRS Large Corporate Underpayment Rate (LCU)
United States The higher rate on large corporate tax underpayments.
Current rate
9% per year, effective July 1, 2026 Published value
The large corporate underpayment rate ("LCU") is an elevated rate that applies to sizable corporate underpayments. Under §6621(c) it equals the federal short-term rate plus 5 percentage points and is reset each quarter — two points above the ordinary underpayment rate.
→ Calculate interest at this rate
Effective-date history
| Effective date | Rate | Basis |
|---|---|---|
| July 1, 2026 | 9% | Published |
| April 1, 2026 | 8% | Published |
| January 1, 2026 | 9% | Published |
| October 1, 2025 | 9% | Published |
| July 1, 2025 | 9% | Published |
| April 1, 2025 | 9% | Published |
| January 1, 2025 | 9% | Published |
| October 1, 2024 | 10% | Published |
| July 1, 2024 | 10% | Published |
| April 1, 2024 | 10% | Published |
| January 1, 2024 | 10% | Published |
| October 1, 2023 | 10% | Published |
| July 1, 2023 | 9% | Published |
| April 1, 2023 | 9% | Published |
| January 1, 2023 | 9% | Published |
| October 1, 2022 | 8% | Published |
| July 1, 2022 | 7% | Published |
| April 1, 2022 | 6% | Published |
| January 1, 2022 | 5% | Published |
| October 1, 2021 | 5% | Published |
| July 1, 2021 | 5% | Published |
| April 1, 2021 | 5% | Published |
| January 1, 2021 | 5% | Published |
| October 1, 2020 | 5% | Published |
| July 1, 2020 | 5% | Published |
| April 1, 2020 | 7% | Published |
| January 1, 2020 | 7% | Published |
| October 1, 2019 | 7% | Published |
| July 1, 2019 | 7% | Published |
| April 1, 2019 | 8% | Published |
| January 1, 2019 | 8% | Published |
| October 1, 2018 | 7% | Published |
| July 1, 2018 | 7% | Published |
| April 1, 2018 | 7% | Published |
| January 1, 2018 | 6% | Published |
| October 1, 2017 | 6% | Published |
| July 1, 2017 | 6% | Published |
| April 1, 2017 | 6% | Published |
| January 1, 2017 | 6% | Published |
Source & provenance
Latest value retrieved July 10, 2026 (02:55 UTC) from the official source:
https://www.irs.gov/payments/quarterly-interest-rates
Reference data only — not legal, tax, or financial advice. Always confirm the controlling value
against the official source and, where applicable, the governing statute or court before relying on it.