The interest rates the law actually charges — kept current
The interest rates the law and the IRS actually charge change every quarter or every week, so a figure you remember is usually already wrong. StatuteRates tracks each one with its effective date, a link to its cited source, and a free JSON API for people and machines — across the US, UK, and EU.
Rates by state → · State rules & data index → · Historical rate lookup → · Prejudgment interest → · Calculators → · Guides → · Glossary →
Every rate carries a source, effective date, and confidence label. Primary government sources are preferred; exceptions remain explicitly reference-only. Follow recorded changes via RSS.
Estimate IRS late-filing penalties and interest
Model failure-to-file and failure-to-pay charges, partial tax payments, quarterly interest-rate changes, and the new automatic penalty-relief comparison in one transparent calculation.
IRS interest rates (§6621)
Quarterly over/underpayment rates the IRS charges and pays, by taxpayer category.
IRC §6603 Deposit / Federal Short-Term Rate
IRS GATT Rate (corporate overpayment over $10,000)
IRS Large Corporate Underpayment Rate (LCU)
IRS Overpayment Interest Rate — Corporate
IRS Overpayment Interest Rate — Non-Corporate
IRS Underpayment Interest Rate (§6621)
US judgment & Treasury rates
The federal post-judgment interest rate and the 1-year Treasury yield that sets it.
US state judgment rates
Statutory interest on money judgments, state by state — fixed by statute or market-linked.
Alabama Judgment Interest Rate
Alaska Judgment Interest Rate
Arizona Judgment Interest Rate
Arkansas Judgment Interest Rate
California Post-Judgment Interest Rate
Colorado Judgment Interest Rate
Connecticut Judgment Interest Rate
District of Columbia Judgment Interest Rate
Delaware Judgment Interest Rate
Florida Judgment Interest Rate
Georgia Judgment Interest Rate
Hawaii Judgment Interest Rate
Idaho Judgment Interest Rate
Illinois Judgment Interest Rate
Indiana Judgment Interest Rate
Iowa Judgment Interest Rate
Kansas Judgment Interest Rate
Kentucky Judgment Interest Rate
Louisiana Judgment Interest Rate
Maine Judgment Interest Rate
Maryland Judgment Interest Rate
Massachusetts Judgment Interest Rate
Michigan Judgment Interest Rate
Minnesota Judgment Interest Rate
Missouri Judgment Interest Rate
Montana Judgment Interest Rate
Nebraska Judgment Interest Rate
Nevada Judgment Interest Rate
New Hampshire Judgment Interest Rate
New Jersey Judgment Interest Rate
New Mexico Judgment Interest Rate
New York Consumer-Debt Judgment Interest Rate
New York Judgment Interest Rate
North Carolina Judgment Interest Rate
North Dakota Judgment Interest Rate
Ohio Judgment Interest Rate
Oklahoma Judgment Interest Rate
Oregon Judgment Interest Rate
Pennsylvania Judgment Interest Rate
Rhode Island Judgment Interest Rate
South Carolina Judgment Interest Rate
South Dakota Judgment Interest Rate
Tennessee Judgment Interest Rate
Texas Judgment Interest Rate
Utah Judgment Interest Rate
Vermont Judgment Interest Rate
Virginia Judgment Interest Rate
Washington Judgment Interest Rate
West Virginia Judgment Interest Rate
Wisconsin Judgment Interest Rate
Wyoming Judgment Interest Rate
United Kingdom
The Bank of England base rate and the statutory interest on late commercial payments.
European Union
The ECB main refinancing rate and a non-country-specific EU Directive minimum benchmark.
Prejudgment interest, state by state
Interest for the period before judgment — a different rate, and different rules. The hard part isn't the number; it's whether it applies at all (usually only on liquidated amounts). We track each state's rate, statute, and claim-type limits.
Why this exists
These values are scattered across quarterly tax bulletins, central-bank feeds, statutes, court rules, and agency tables. StatuteRates assembles the recorded observations into one normalized, provenance-tracked, as-of-date dataset — the thing neither a single government page nor a language model gives you in one place. Start with the plain-language statutory interest guide, then see methodology & sources and how the data is collected.