Do federal holidays count as business days?
In a general U.S. business-day calendar, a federal holiday observed on a weekday is usually not counted as a business day. The exact answer depends on the calendar used by the organization or agreement.
General planning rule
Business-day calculators often start by removing Saturdays and Sundays. If federal holiday exclusions are enabled, they also remove listed federal holidays that fall on weekdays. That means a Monday federal holiday usually does not count as a business day under this planning rule.
Observed holidays matter. If a holiday falls on a weekend and is observed on Friday or Monday, the observed weekday is often the date removed from the business-day count.
When a holiday may still matter differently
Not every business process follows the federal holiday list. Some companies work on federal holidays. Some banks, courts, schools, states, and employers use different schedules. If the calculation affects payroll, filing, legal deadlines, or payments, use the official source for that specific process.
How to avoid mistakes
Label your count as weekday-only, federal-holiday-excluded, bank-holiday-excluded, or company-calendar-specific. That label is often more useful than the number alone because it explains why two calendars may disagree.