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Valor Tax Relief Team
Professional Tax Resolution Specialists
Published: April 21, 2026
Last Updated: April 21, 2026
Key Takeaways
- •Window: April 1–June 30, 2026—rates refresh from Q1 across published categories.
- •Individuals: 6% on over- and underpayments (was 7%), daily compounding.
- •Corporations: 5% overpayment; 3.5% on overpayment over $10k; 6% underpayment; 8% LCU—each about one point below Q1.
- •Spreads over the federal short-term rate are unchanged; only the base moved. See Q1 2026 for the prior quarter.
Overview
The IRS posted lower quarterly interest for Q2 2026 as the federal short-term rate stepped down. Filers use these percentages to estimate carrying costs on balances and interest on delayed refunds; corporate treasury teams map them to estimated tax and examination reserves.
Q2 Rates in Context
April through June figures fall roughly one point versus January–March for the headline buckets. Big balances still grow noticeably at 6% compounded daily; refund interest simply earns a little less than in Q1.
Rates for Individual Taxpayers
6% per year applies to both overpayments and underpayments, computed daily—down from 7%. For how the Service builds the balance, see our interest mechanics article.
Rates for Corporate Taxpayers
C corporations and other entities subject to the corporate schedule should model cash taxes with the segmented structure below—each line compounds daily and steps down one point from Q1.
| Category | Annual rate (Q2 2026) | Notes |
|---|---|---|
| Corporate overpayment | 5% | General overpayment slice; daily compounding. |
| Overpayment > $10,000 | 3.5% | Applies to the excess portion above the threshold. |
| Corporate underpayment | 6% | Standard underpayment rate for most entities. |
| Large corporate underpayment (LCU) | 8% | Higher tier where LCU rules apply by statute. |
How the IRS Sets These Rates
Each quarter starts from the federal short-term rate. Most individual over- and underpayments add three percentage points to that base.
Corporations use different add-ons: +3 for underpayments, +2 for general overpayments, +5 for large corporate underpayments, and +0.5 for the overpayment slice above $10,000. Those margins are fixed; only the short-term rate—and the published headlines—move.
Practical Impact of the Q2 Reduction
One percentage point slows accrual slightly but does not erase a liability. Daily compounding at 6% still exceeds typical bank yields, so timelines drive total cost more than the quarterly tweak.
Heads-up: New rates can post again July 1. Confirm IRS releases before year-end modeling, and remember penalty relief rarely stops interest from running.
Planning Moves While Rates Ease
Recalculate installment payoff dates and estimated deposits with the lower rate, but keep filing on time—late-filing penalties can dwarf a one-point interest dip. For multi-year clean-up, review back tax relief and payment plans before Q3 numbers land.
How Valor Tax Relief Can Help
We translate rate tables into balance projections, verify transcripts, and align installment or settlement strategy with what the IRS will actually approve—so quarter-to-quarter rate moves fit a coherent plan.
Questions About Interest or an IRS Balance?
Talk through Q2 rate effects, transcript balances, and resolution options with specialists who deal with the IRS every day.
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