What “Within Five Business Days” Actually Means

"Within five business days" depends on how the writer defines a business day. Courts, banks, carriers and employers define it differently, so the same phrase can end on different dates.

The three things a definition has to settle

Any workable definition answers three questions, and organisations answer them differently:

Which weekdays count? Almost always Monday to Friday, with exceptions. Some financial instruments count only the days a particular market is open, which leaves out days that are ordinary weekdays elsewhere.
Which holidays are excluded? Most disagreements start here. The federal holiday list is one answer, a state's list is another, and the days a particular institution closes are a third. The three lists differ.
What happens when the last day is not a business day? Nearly every scheme rolls forward to the next one. A few roll backward. The difference matters most at month end.

Four common readings

Court rules. Modern federal civil procedure computes day-based periods by excluding the day of the triggering event, counting every intervening day including weekends and holidays, and then rolling forward if the last day falls on a weekend or legal holiday. This surprises most people: in a period stated in days, weekends count, and only the landing day is protected. Periods stated in business days are a separate case, and the rules say which applies.

Banking. Funds-availability rules separate a "business day" (any day that is not a Saturday, Sunday or legal holiday) from a "banking day", a business day on which that particular bank is open for substantially all its business. The availability schedule counts banking days. A bank closed on a Friday afternoon has had a business day but not a banking day.

Carriers and retailers. Delivery estimates in business days usually mean the carrier's own operating days, which for some services include Saturday. A "three business day" shipment quoted on a Thursday may arrive Monday or Tuesday depending on whether that carrier treats Saturday as operating.

Employers. Internal policies almost always mean the days that office is open. That leaves out company holidays that appear on no public list and keeps public holidays the company works through.

Why your answer differs from theirs

When a business-day count disagrees with an institution's, the cause is usually one of four things, in rough order of frequency: a holiday one side removed and the other did not; a holiday that fell on a weekend and was observed on an adjacent weekday; a disagreement about whether the start date is counted; or a roll-forward at the end that one side applied and the other did not.

All four show up when the calculation shows its working. The business days calculator lists every day it removed and why, so you can find the day where two counts part. The observed-date question has its own guide.

What to do

Where a deadline matters, read the document's own definition of a business day. It is usually in a definitions clause and takes a minute to find. Where there is no definition, count conservatively: treat the earlier of the plausible readings as the deadline, and say in writing which reading you used, so a disagreement comes up before the date is missed.

This guide describes how these schemes are structured. It is not legal advice, and it does not tell you when any particular deadline falls.