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Business Day Calculator

Singapore Business Day Calculator

Calculate business days in Singapore with the 11 gazetted public holidays preselected, plus the Sunday-to-Monday in-lieu rule under the Holidays Act. The calculator excludes Chinese New Year (both days), Hari Raya Puasa, Good Friday, Hari Raya Haji, Vesak Day, National Day, Deepavali, and Christmas Day. Use it for MAS reporting deadlines, GIRO and MEPS+ settlement, IRAS filing windows, and SLA tracking under MOM-gazetted holidays.

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How Singapore business days are defined

Singapore business days are Monday through Friday, excluding the 11 gazetted public holidays under the Holidays Act, plus the in-lieu Monday when a holiday lands on a Sunday. The Employment Act references the same holiday list for paid leave entitlements. Saturday is technically a half working-day in some older contracts, but every modern commercial agreement and MAS reporting schedule treats Saturday and Sunday alike, which is what this calculator does.

Five of the eleven gazetted holidays follow non-Gregorian calendars. Chinese New Year is set on the lunar new year and the day after. Vesak Day is on the full moon of Vaisakha. Hari Raya Puasa marks the start of Shawwal in the Islamic calendar, Hari Raya Haji marks the tenth of Dhu al-Hijjah, and Deepavali follows the Tamil tradition's Naraka Chaturdashi. MOM publishes the upcoming year's gazetted dates around mid-year of the prior year.

Singapore gazetted public holidays

The 11 gazetted public holidays under the Holidays Act:

  • New Year's Day (1 January)
  • Chinese New Year Day 1 (1st day of the lunar new year)
  • Chinese New Year Day 2 (2nd day of the lunar new year)
  • Good Friday (Friday before Easter)
  • Hari Raya Puasa (1 Shawwal)
  • Labour Day (1 May)
  • Vesak Day (full moon of Vaisakha)
  • Hari Raya Haji (10 Dhu al-Hijjah)
  • National Day (9 August)
  • Deepavali (Naraka Chaturdashi, Tamil reckoning)
  • Christmas Day (25 December)

When two gazetted holidays fall on the same calendar day, the next non-holiday weekday becomes a holiday in lieu under MOM guidance. The 2029 lunar calendar sets up exactly this collision around Chinese New Year and Hari Raya Puasa. How we determine holidays →

Common use cases in Singapore

MAS reporting under MAS 610 and MAS 1003 runs on T+ business days. IRAS Income Tax filings for Year of Assessment 2026 follow calendar-day deadlines of 18 April for paper filings and 15 April for e-filings, but tax computations that hinge on a year-end revaluation cut-off use the SGX trading calendar. Corporate finance teams treat Chinese New Year as a hard four-day window for funding because both gazetted CNY holidays plus the surrounding weekend typically remove the Hong Kong, Taiwan, China, and Korea desks from the market at the same time.

BPO and shared-service centres serving US or EU clients usually run their SLAs on the client's holiday calendar, not Singapore's, but MOM still requires Singapore-resident employees to receive their gazetted public holidays. Operations teams reconcile the two calendars by maintaining parallel SLA exclusion lists. The calculator's Advanced options field is designed for exactly this kind of overlay, where a base country calendar is extended with extra exclusions.

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.

Frequently Asked Questions

What are the gazetted public holidays in Singapore?
The Ministry of Manpower gazettes 11 public holidays each year under the Holidays Act: New Year's Day (1 January), Chinese New Year Day 1, Chinese New Year Day 2, Hari Raya Puasa, Good Friday, Labour Day (1 May), Vesak Day, Hari Raya Haji, National Day (9 August), Deepavali, and Christmas Day (25 December). Chinese New Year, Hari Raya Puasa, Hari Raya Haji, Vesak Day, and Deepavali shift each year because they follow lunar or Islamic calendars. Singapore is a city-state with no sub-national variants, so the gazetted set is uniform across the island.
How does Singapore's Sunday in-lieu rule work?
Section 4 of the Holidays Act states that when a public holiday falls on a Sunday, the following Monday becomes a public holiday. The original Sunday is still a holiday under the gazette, but Monday is the day employees are entitled to away from work. Saturday-falling holidays do not trigger an in-lieu day under Singapore law, which differs from the UK and Australia. This calculator lists the Monday in-lieu date when the actual holiday lands on a Sunday and the Saturday-falling date as-is when it lands on a Saturday.
Why are some Singapore lunar and Islamic holidays marked approximate?
MOM gazettes the upcoming year's holidays around mid-year of the previous year. Chinese New Year is on a deterministic lunar calendar, but Hari Raya Puasa, Hari Raya Haji, Vesak Day, and Deepavali have small year-by-year drifts depending on moon-sighting and astronomical calculations. For 2024 to 2026 we use the gazetted dates. For 2027 to 2029 the dates in the calculator are calculated from astronomical algorithms and tagged approximate, the same convention used for India and the Philippines. Verify against the MOM gazette once it is published before pinning a legally critical deadline.
How do GIRO and FAST settle around Singapore public holidays?
FAST runs 24 by 7, so retail transfers post immediately even on a public holiday. GIRO and corporate Bulk Transfers settle on business days only, which are Monday through Friday excluding gazetted holidays. The Monetary Authority of Singapore publishes the MEPS+ holiday calendar, which mirrors the MOM list, so a GIRO payment instructed on the afternoon before Hari Raya Haji will not credit until the next business day. Confirm with your bank whether their internal cut-off pulls the effective date back another half-day around major holidays.
Are 31 December or other observance days holidays in Singapore?
No. Singapore does not gazette 31 December, 2 January, the eve of Chinese New Year, or Christmas Eve as public holidays. Some employers grant a half-day or full-day off on Lunar New Year's Eve and Christmas Eve as a goodwill gesture, but those are HR policy rather than statute. The calculator sticks to the 11 gazetted dates plus their Sunday in-lieu Monday. Add company-specific dates under Advanced options if you need them counted.

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Holidays in Singapore 2026 →Holidays in Singapore 2027 →Working days in 2026 →Business vs calendar days →Due dates on weekends or holidays →Business days in a year →