The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
The Budget Enforcement Act of 1990 requires the President to submit the budget no later than the first Monday in February, which in 2027 is 1 February.
Congressional Research Service report on the submission deadline and its history.[1]
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