Definitions before conclusions
U.S. national debt glossary
Fiscal terms often sound interchangeable when they are not. These definitions match the labels used throughout The Debt Clock.
- Average interest rate
- The weighted average rate the Treasury pays on outstanding securities of a given type, published monthly.
- Confirmed figure
- A value published in an official source record. On this site, it is the latest Treasury Debt to the Penny total and date.
- Daily Treasury Statement (DTS)
- A daily report of the Treasury’s cash and debt operations, including debt subject to the statutory limit.
- Debt held by the public
- Treasury securities held outside federal government accounts, including holdings by individuals, institutions, the Federal Reserve, and foreign investors and governments.
- Debt subject to limit
- The portion of total public debt the statutory limit applies to. It excludes small items such as unamortized discount and Federal Financing Bank debt, so it is slightly below the clock’s total.
- Debt to the Penny
- The Treasury dataset reporting total public debt outstanding for each business day, to the cent. It is the confirmed figure behind the clock.
- Debt-to-GDP ratio
- A selected debt measure divided by annual GDP. Always check which debt definition and GDP vintage were used.
- Extraordinary measures
- Accounting steps the Treasury can take after reaching the debt limit—such as suspending investments in certain federal trust funds—to keep paying obligations for a limited time.
- Federal deficit
- The amount by which federal spending exceeds federal revenue during a stated period. The opposite is a surplus.
- Fiscal year
- The federal government’s accounting year, running from 1 October to 30 September. Fiscal year 2026 began on 1 October 2025.
- Floating rate notes (FRN)
- Two-year Treasury securities whose interest payments reset with the 13-week bill rate.
- Foreign official holdings
- Treasury securities held by foreign central banks, governments and other official institutions, as opposed to private foreign investors.
- Government Account Series
- Non-marketable Treasury securities held by federal trust funds such as Social Security. They make up most intragovernmental holdings.
- Gross domestic product (GDP)
- The market value of goods and services produced by the economy. Nominal GDP uses current prices; real GDP adjusts for price changes.
- Gross interest expense
- Interest associated with Treasury debt before subtracting interest income received elsewhere by the federal government.
- Intragovernmental holdings
- Treasury securities held by federal government accounts, including trust funds. They are part of total public debt outstanding.
- Marketable securities
- Treasury securities that can be bought and sold in the secondary market after issue: bills, notes, bonds, TIPS and FRNs.
- Monthly Treasury Statement (MTS)
- The Treasury’s official monthly report of federal receipts, outlays and the deficit or surplus. It is the source for our deficit figures.
- Net interest outlays
- The budget measure of federal interest costs after certain interest income is offset. It differs from gross interest expense.
- Nominal dollars
- Dollar amounts at prices applicable at the time, without adjustment for inflation. The historical debt table uses nominal dollars.
- Non-marketable securities
- Securities that cannot be traded, such as savings bonds and the Government Account Series held by federal trust funds.
- Projection
- An estimate between official publications. Our projection is derived from a trailing, outlier-filtered daily change and is never labelled as confirmed.
- Receipts and outlays
- Receipts are money collected (mainly taxes); outlays are payments made. The deficit is outlays minus receipts.
- Statutory debt limit (debt ceiling)
- The maximum amount of debt the Treasury may have outstanding under federal law. It caps borrowing to pay for spending Congress already approved; it does not authorize new spending.
- TIC data
- Treasury International Capital statistics, which estimate holdings of U.S. securities by foreign residents. Custody location can differ from true ownership.
- TIPS
- Treasury Inflation-Protected Securities, whose principal is adjusted with the Consumer Price Index.
- Total public debt outstanding
- The Treasury’s broad total of debt held by the public plus intragovernmental holdings. This is the measure used by the clock.
- Treasury bills
- Marketable securities maturing in one year or less, sold at a discount to face value.
- Treasury bonds
- Marketable securities with 20- or 30-year maturities that pay interest every six months.
- Treasury notes
- Marketable securities with maturities of two to ten years that pay interest every six months.
- Treasury security
- A bill, note, bond, inflation-protected security or other instrument through which the Treasury borrows.
- Trust funds
- Federal accounts, such as Social Security and Medicare, that by law invest their surpluses in non-marketable Treasury securities.
- X-date
- The projected day on which the Treasury could no longer meet all obligations in full after exhausting cash and extraordinary measures. It is an estimate, not a published deadline.
For official dataset-specific definitions, see the source list and methodology.
Put the definitions to work
TodayCurrent U.S. debtThe confirmed total, recent Treasury changes and the live projection.Personal scaleDebt per personPer resident and per taxpayer today, and debt per person since 1930.CalculatorNational debt calculatorYour share per resident, taxpayer or household, your share of interest, and growth since any year.Since 1790Debt historyEvery fiscal year since 1790, trillion-dollar milestones and the daily series since 1993.Annual gapFederal deficitThis fiscal year month by month, and every completed year’s receipts and outlays.Legal limitDebt ceiling trackerThe statutory limit, debt subject to it, remaining headroom and the timeline.HoldersWho owns the debtTrust funds, U.S. investors and foreign holders by country, with custody caveats.ContextDebt by presidentAdministration-period changes without pretending presidents act alone.CostInterest on the debtAnnual interest expense since 2016 and the average rate on every security type.Economic scaleDebt-to-GDPThe current ratio, its history since 1930 and the World War II comparison.Essential distinctionDebt versus deficitA balance on one date versus a budget gap measured across a period.PublishFree debt clock widgetEmbed a sourced, accessible clock on any site with one line of HTML.