US interest expense on the national debt alone could exceed $1 trillion by 2020.

Test: did annual US federal interest expense on the national debt exceed $1 trillion in any fiscal year up to and including FY2020? The claim says 'could', but judge it as a forecast that this would happen by 2020. Use Treasury's reported interest expense. Gross interest on Treasury debt securities counts; if gross and net interest point to different verdicts, say so and take gross interest as the measure the claim's 'interest expense on our national debt' most directly describes. True: interest expense exceeded $1 trillion in FY2020 or earlier. Mostly true: it reached at least about $950 billion (within about 5% of $1 trillion) by FY2020 but did not exceed it. Mixed: not used. Mostly false: it first exceeded $1 trillion only after FY2020, or it reached roughly $700–950 billion by FY2020. False: it stayed well below $1 trillion (under about $700 billion) through FY2020 and did not pass $1 trillion soon after.

Set before the research began.

1. E1 Interest on National Debt by Security: FY2026 · TFTC TFTC (compiles US Treasury Fiscal Data) · 4 October 2024

   “| FY2020 | $523B | −9.0% | $368B | $30.4B | $209B | $91.7B | $25.9B | $3.9B | $4.6B | $2.9B | $155B |”

2. E2 Interest on National Debt by Security: FY2026 · TFTC TFTC (compiles US Treasury Fiscal Data) · 4 October 2024

   “| FY2024 | $1.13T | +28.4% | $896B | $306B | $338B | $139B | $71.2B | $30.9B | $6.3B | $4.2B | $237B |”

3. E3 Federal Net Interest Costs: A Primer Congressional Budget Office · 15 December 2020

   “In fiscal year 2020, the government’s net outlays for interest totaled $345 billion, equal to 1.6 percent of gross domestic product (GDP) and accounting for 5.3 percent of total spending.”

4. E4 How and why the government borrows money The Journalist's Resource (Shorenstein Center) · 25 June 2025

   “Last fiscal year, the federal government for the first time paid over $1 trillion in interest on outstanding debt accumulated throughout the nation’s existence.”

Treasury gross interest on the public debt was $523B in FY2020 (E1), and CBO reports net interest of $345B that year (E3), so neither measure came near $1 trillion by FY2020. Gross interest did exceed $1 trillion later, reaching $1.13T in FY2024 (E2), and E4 confirms that the government first paid over $1 trillion in interest in a recent fiscal year. Because the $1 trillion level was first passed only after FY2020, this fits the criteria's mostly-false condition, although the FY2020 figure was well under $700B.