Payment terms, notice periods, court deadlines and contract clauses all lean on one simple phrase: “business days”. Yet the exact definition trips up more UK business owners than it should, especially once bank holidays, weekends, and regional differences between England, Scotland and Northern Ireland get involved. This guide sets out exactly what counts as a business day in the UK, how to calculate them correctly, and where the definition actually matters in practice.
Quick Answer
A business day, also called a working day, in the UK is any weekday, Monday to Friday, that is not a public bank holiday. Weekends and bank holidays are excluded. This definition governs payment terms, employment notice periods, and most contract and court deadlines, though the exact bank holidays vary between England and Wales, Scotland, and Northern Ireland.
What Counts as a Business Day in the UK?
A business day is any day your business or the courts are ordinarily open for official activity. In the UK, that means Monday through Friday, excluding Saturday, Sunday, and the relevant bank holidays for your part of the UK. “Business day” and “working day” are used interchangeably in almost every UK legal and commercial context, from invoice payment terms to Companies House filing deadlines.
UK Bank Holidays by Nation
The number of bank holidays differs across the UK, which changes the total working day count for businesses operating in more than one nation.
| Nation | Standard Bank Holidays per Year |
|---|---|
| England and Wales | 8 |
| Scotland | 9 (includes St Andrew’s Day and 2 January) |
| Northern Ireland | 10 (includes St Patrick’s Day and Battle of the Boyne) |
England and Wales observe New Year’s Day, Good Friday, Easter Monday, the early May bank holiday, the spring bank holiday, the summer bank holiday, Christmas Day, and Boxing Day. When a bank holiday falls on a weekend, a substitute weekday is given, usually the following Monday.
How Many Working Days Are There in a Year?
A standard non-leap year in England and Wales has 365 days. Subtracting 104 weekend days and 8 bank holidays leaves 253 working days. A leap year adds one extra day, bringing the total to around 254, depending on where that extra day falls. Scotland typically has slightly fewer working days due to its extra bank holidays, and Northern Ireland fewer still.
| Calculation | Result |
|---|---|
| 365 total days | Starting point |
| Minus 104 weekend days | 261 remaining |
| Minus 8 bank holidays (England and Wales) | 253 working days |
On average, most UK businesses see 20 to 22 working days in a typical month, though months containing two bank holidays, such as May, fall closer to 19 or 20.
Business Days and Payment Terms
Business day calculations matter most in practice when they define a payment deadline. If an invoice states payment is due within 30 days, and no specific definition is given, this is usually read as 30 calendar days rather than 30 business days, though contracts can specify either. Getting this distinction clear in your own invoice terms avoids disputes later. Our guide to UK invoice requirements covers exactly what to include on an invoice, and our guide to late payment of commercial debts explains what happens once a payment deadline passes.
Business Days in Employment Contexts
Employment notice periods, probation review dates, and statutory deadlines such as the requirement to provide a written statement of employment particulars all typically run on working days rather than calendar days, unless the contract states otherwise. Our guide to UK employment contract requirements covers how notice periods and other day-one obligations are structured.
Business Days for Statutory and Companies House Deadlines
Some statutory deadlines are expressed in calendar days rather than business days, so it is worth checking the specific wording rather than assuming. The 14-day window to file a confirmation statement after your review period ends, for example, runs on calendar days, not working days, so bank holidays and weekends do not extend it.
Is Saturday a Business Day in the UK?
No, not under the standard UK legal and commercial definition. Saturday and Sunday are both treated as non-working days for contracts, payment terms, and employment notice periods, even though many retail and hospitality businesses trade on Saturdays. Some service industries operate their own internal definition of a working week that includes Saturday, but this needs to be stated explicitly in a contract to override the default assumption.
How to Calculate Business Days Between Two Dates
- Count the total number of calendar days between your start and end date
- Subtract the number of weekend days (Saturdays and Sundays) falling within that range
- Subtract any bank holidays that fall within the range, using the correct list for England and Wales, Scotland, or Northern Ireland
- The remaining figure is your total business days
For short date ranges, this is straightforward to work out by hand using a calendar. For longer or recurring calculations, most accounting and payroll software will calculate working days automatically once the correct region is set.
Frequently Asked Questions
What is a business day in the UK?
Any weekday, Monday to Friday, that is not a public bank holiday. Weekends are always excluded.
Do bank holidays count as business days?
No. Bank holidays are treated as non-working days for contracts, payment terms, and most statutory deadlines.
Is Saturday a business day in the UK?
No, under the standard legal and commercial definition. Saturday and Sunday are both non-working days unless a contract specifically states otherwise.
How many working days are there in a UK year?
Around 253 in England and Wales for a standard non-leap year, slightly fewer in Scotland and Northern Ireland due to additional bank holidays.
Do bank holidays differ across the UK?
Yes. England and Wales have 8 standard bank holidays, Scotland has 9, and Northern Ireland has 10, each including nation-specific dates.
Key Takeaways
- A UK business day is any weekday that is not a bank holiday
- England and Wales have 8 bank holidays a year, Scotland 9, and Northern Ireland 10
- A standard year has around 253 working days in England and Wales
- Saturday and Sunday are not business days under the standard definition
- Always check whether a contract or deadline uses calendar days or business days, since the two are not interchangeable
About the Author
This guide was prepared by the Business Mine editorial team, who research and write practical UK business, tax and finance guides. Information is checked against current gov.uk guidance at the time of publication. This article is provided for general information only and does not constitute legal advice.
