Business Days in January 2026 for Ireland

public holidays in January 2026

Ireland January deadlines

January is the heaviest month for Revenue Online Service (ROS) traffic. VAT3 returns for the November-December bimonthly period are due January 19 (paper) or January 23 (ROS extended pay-and-file). PAYE/USC Revenue Payroll Notifications reset for the new tax year and employers retrieve fresh RPNs through Revenue's PAYE Modernisation infrastructure. PRSI Class A1 thresholds and Universal Social Charge bands apply from January 1. Annual returns to the Companies Registration Office (CRO) for companies with November year-ends fall due.

Day-of-Week Distribution

The count of each weekday in January 2026. Useful for shift scheduling, weekly recurring billing, and any rota that depends on a specific day of the week landing in-month.

Ireland reporting cycles and business-day rules

Irish business-day cycles align with Revenue's VAT3 bimonthly cutoffs (paper on the 19th, ROS extended to the 23rd) and PAYE monthly remittance on the 14th of the following month for most employers, with the PAYE Modernisation system reporting in real time on each pay event. The Central Bank of Ireland operates TARGET2-IE for euro wholesale settlement on TARGET2 business days, which exclude bank holidays. Form CT1 corporation tax is due nine months after the company year-end. The European Communities (Late Payment in Commercial Transactions) Regulations 2012 set 8% above the ECB main refinancing rate as the statutory late-payment interest rate, payable from day 31 after invoice for B2B transactions.

January 2026 working days compared by country

Working-day counts vary across countries because each country observes its own public holidays. The table below puts Ireland alongside the other ten supported holiday calendars for January 2026.

How January 2026 compares year over year

January 2025 had 22 working days, so January 2026 has 1 fewer working day year over year. On the surrounding months, December 2025 has 21 working days and February 2026 has 19. Looking forward, January 2027 has 20 working days under the same Irish public holiday calendar.

Using this calculator in Ireland

A Dublin treasury operator at an international tech HQ uses the 21-day January 2026 count to align SEPA Credit Transfer cycles with Central Bank of Ireland TARGET2-IE clearing and prompt-pay windows under the European Communities (Late Payment in Commercial Transactions) Regulations 2012. A Cork law-firm cashier uses business-day math to track Workplace Relations Commission complaint windows under the Workplace Relations Act 2015. A Galway SaaS controller uses the count to align Revenue VAT3 bimonthly returns and ROS Form CT1 nine-month corporation-tax filings against month-end cutoffs.