Northern Ireland Business Day Calculator
Last reviewed: May 19, 2026 · Holiday data: June 23, 2026
Calculate business days in Northern Ireland with its own bank holidays. Northern Ireland shares the Monday to Friday working week and the Saturday and Sunday weekend with England and Wales, but its bank holiday calendar is different, so due dates and deadlines can land differently from the England and Wales count.
How Northern Ireland differs from England & Wales
Northern Ireland observes every England and Wales bank holiday and layers two more on top: St Patrick's Day on 17 March and the Battle of the Boyne, also called Orangemen's Day, on 12 July. When either falls on a weekend, the bank holiday shifts to the following Monday. Nothing from the England and Wales set is dropped, so Northern Ireland has the longest bank holiday calendar of the four UK nations.
Worked example
Adding 3 business days to Monday, March 16, 2026 using Northern Ireland's bank holidays lands on Friday, March 20, 2026. With the England and Wales bank holidays, the same calculation lands on Thursday, March 19, 2026: the gap comes from Northern Ireland's own calendar.
Northern Ireland bank holidays in 2026
| Date | Day | Bank holiday |
|---|---|---|
| January 1 | Thursday | New Year's Day |
| March 17 | Tuesday | St Patrick's Day |
| April 3 | Friday | Good Friday |
| April 6 | Monday | Easter Monday |
| May 4 | Monday | Early May Bank Holiday |
| May 25 | Monday | Spring Bank Holiday |
| July 13 | Monday | Battle of the Boyne (observed) |
| August 31 | Monday | Summer Bank Holiday |
| December 25 | Friday | Christmas Day |
| December 28 | Monday | Boxing Day (observed) |
How to count Northern Ireland business days
For an interactive calculation, use the UK (England and Wales) calculator and add Northern Ireland's own dates under Advanced options. The per-year bank holiday pages below list every Northern Ireland date ready to paste in.
Northern Ireland bank holiday data is verified against gov.uk/bank-holidays.
Related links
For informational purposes only
This calculator provides general estimates based on business day counting rules. It does not constitute legal advice. Deadlines in legal, regulatory, or contractual matters may be subject to jurisdiction-specific rules, court orders, or statutory exceptions. Always verify critical deadlines with a qualified professional.