A business day is generally any weekday from Monday through Friday that is not a federal holiday, which answers what counts as a business day in most everyday situations. The complication is that federal law does not define the term the same way everywhere. Several important rules — mortgage cancellation rights, door-to-door sale refunds, tax filing deadlines, bank deposits — each use their own definition, and under some of them Saturday counts.
The Standard Definition
In ordinary use, a business day is any of the five weekdays when government offices, banks, and most private businesses are open, typically from 9:00 a.m. to 5:00 p.m. local time. That schedule is a cultural norm, not a legal requirement. No single federal statute sets a universal definition; each regulatory area supplies its own, tailored to the transactions it governs. The result is that a day treated as a business day under one rule may not count under another.
Federal Holidays That Are Never Business Days
Federal law designates eleven public holidays, and they are excluded from business-day counts across nearly every federal rule.1Office of the Law Revision Counsel. 5 USC 6103 – Holidays
- New Year’s Day: January 1
- Birthday of Martin Luther King, Jr.: Third Monday in January
- Washington’s Birthday: Third Monday in February
- Memorial Day: Last Monday in May
- Juneteenth National Independence Day: June 19
- Independence Day: July 4
- Labor Day: First Monday in September
- Columbus Day: Second Monday in October
- Veterans Day: November 11
- Thanksgiving Day: Fourth Thursday in November
- Christmas Day: December 25
When one of these dates lands on a Saturday, the holiday is observed on the preceding Friday. When it lands on a Sunday, it is observed the following Monday.1Office of the Law Revision Counsel. 5 USC 6103 – Holidays The observed date is what gets removed from business-day counts. In 2026, for example, July 4 falls on a Saturday, so Friday, July 3 is the observed holiday and does not count as a business day.
When Saturday Counts as a Business Day
A handful of consumer-protection rules use a broader definition: every calendar day except Sundays and the federal holidays listed above. Under this version, Saturday is a business day. The rules that use it tend to be the ones that give you a short window to cancel or review something, and misreading the definition can cost you the right.
The Right to Cancel a Home-Secured Loan
When you take out a loan secured by your primary residence — a home equity loan or a refinance, for example, but not a purchase mortgage — you have until midnight of the third business day after closing to cancel the transaction for any reason.2Office of the Law Revision Counsel. 15 USC 1635 – Right of Rescission as to Certain Transactions Because Saturday counts under the rescission definition, a loan that closes on Wednesday gives you until midnight Saturday, not the following Monday.3eCFR. 12 CFR 1026.2 – Definitions and Rules of Construction
The Closing Disclosure Waiting Period
Your lender must deliver the Closing Disclosure at least three business days before your scheduled closing.4Consumer Financial Protection Bureau. Closing Disclosure Explainer Saturday counts here as well. For a Wednesday closing, the disclosure must be in your hands by the preceding Saturday at the latest.
The FTC Cooling-Off Rule
The Federal Trade Commission’s cooling-off rule gives you until midnight of the third business day after a qualifying sale to cancel for a full refund. It covers sales of $25 or more made at your home and $130 or more at temporary locations such as hotel meeting rooms, convention centers, or fairgrounds. For this rule, business day again means every calendar day except Sundays and federal holidays.5eCFR. 16 CFR Part 429 – Rule Concerning Cooling-Off Period for Sales Made at Homes or at Certain Other Locations A Wednesday doorstep sale gives you until midnight Saturday to cancel. The rule does not reach purchases made entirely online, by mail, or by phone, and it does not apply to insurance, securities, or real estate.
Banking, Debit Cards, and Payments
For deposit availability, Regulation CC uses the concept of a “banking day”: the part of any business day when a bank is open to the public for substantially all of its banking functions.6eCFR. 12 CFR Part 229 – Availability of Funds and Collection of Checks A branch that opens Saturday only to accept deposits is not performing substantially all its functions, so Saturday is not a banking day, and a check deposited that morning is treated as deposited Monday for availability purposes.
Regulation E, which governs electronic transactions like debit card purchases and ATM withdrawals, uses a parallel definition: any day the financial institution is open for substantially all business functions.7eCFR. 12 CFR 1005.2 – Definitions That definition drives several deadlines worth knowing:
- Report a lost or stolen debit card within two business days of learning of the loss, and your maximum liability for unauthorized charges is capped at $50.
- Wait longer than two business days and your liability can rise to $500.
- After you report an error, the bank generally has 10 business days to investigate and 1 business day to correct a confirmed error.8eCFR. 12 CFR 1005.11 – Procedures for Resolving Errors
You have up to 60 days from the date the statement is sent to report an error, but the two-business-day clock for limiting your liability begins the moment you discover the loss, not when the statement arrives.
Payments carry their own cutoff times. Any wire or ACH instruction submitted after your bank’s daily cutoff is treated as received the next business day, which can push settlement a day or more. Instructions sent on a weekend or holiday settle on the next business day as well.
Tax Deadlines
The IRS rule is simple: when a filing or payment deadline falls on a Saturday, Sunday, or legal holiday, it moves to the next day that is none of those.9Internal Revenue Service. Publication 509 – Tax Calendars “Legal holiday” for IRS purposes includes any legal holiday observed in the District of Columbia, not just federal holidays. That is why D.C. Emancipation Day (April 16) can push the April 15 filing deadline into April 17 in some years.
Statewide holidays can also extend a deadline, but only if the IRS office where you are required to file sits in that state, and a statewide holiday does not affect the deadline for federal tax deposits.
If you mail a return or payment, the postmark date — not the delivery date — counts as your filing date, provided the envelope is properly addressed and carries the correct postage.10Office of the Law Revision Counsel. 26 USC 7502 – Timely Mailing Treated as Timely Filing and Paying For registered mail, the registration date itself serves as proof of the postmark.
Court Filing Deadlines
Federal courts count time using a method set out in the Federal Rules of Civil Procedure. When a period is stated in days, you exclude the day of the triggering event, count every intervening day including weekends, and if the last day falls on a Saturday, Sunday, or legal holiday, the deadline extends to the next day that is not one of those.11LII / Legal Information Institute. Federal Rule of Civil Procedure Rule 6 – Computing and Extending Time If the clerk’s office is physically inaccessible on the last day because of weather or another emergency, the deadline shifts to the first accessible day.
Electronic filings are timely if submitted by midnight in the court’s time zone. Physical filings must reach the clerk’s office before it closes, which is typically 5:00 p.m. A paper handed over at 5:01 p.m. may be stamped as filed the next business day.
How to Count Business Days
The counting method is the same across most contexts, with the key variable being which days are eligible:
- Start with the day after the triggering event. If you sign a contract Monday, day one is Tuesday.
- Count only eligible days. Under the standard definition, skip Saturdays, Sundays, and federal holidays. Under the broader definition used for mortgage rescission, the Closing Disclosure, and the FTC cooling-off rule, skip only Sundays and federal holidays.
- Mind the cutoffs. A wire sent after your bank’s afternoon cutoff is submitted the next business day. A return postmarked after midnight misses that day’s deadline.
A worked example: suppose you close a home equity loan on Thursday, June 18, 2026. Under the rescission rule, day one is Friday the 19th, day two is Saturday the 20th, and day three skips Sunday the 21st and lands on Monday the 22nd. Your right to cancel expires at midnight that Monday. Shift the closing to Wednesday, June 17, 2026, and the count runs into Juneteenth on Friday the 19th, which is a federal holiday and does not count. The three eligible days become Thursday, Saturday, and Monday, ending the window at midnight Monday, June 22.
When a deadline carries real money or a lost right, check the specific regulation that governs your situation rather than defaulting to Monday through Friday. The gap between the two common definitions is almost always a Saturday, and a Saturday can be the whole deadline.