>>510474871The US government often has monthly surpluses. For example, the US had surpluses in June 2005, 2006, 2008, 2013, 2014, 2015, and 2016. This is because of calendar effects and payment scheduling, not because the government has balanced the budget.
https://fred.stlouisfed.org/series/MTSDS133FMS
US tariff revenue in 2025 was $27B, up $20B compared to June 2024. This is tiny and was not the reason for the surplus. Rather, it was that in June outlays were $499B whereas in May outlays were $687B. This is probably because of payment scheduling
https://fiscal.treasury.gov/files/reports-statements/mts/mts0625.pdf
https://fiscaldata.treasury.gov/static-data/published-reports/mts/MonthlyTreasuryStatement_202505.pdf