The Singapore SME compliance calendar isn't mysterious. It's a small set of recurring obligations across ACRA, IRAS, CPF Board, and MOM — each well-defined, each with a known cadence, each with consequences if missed.

What separates operators who run their compliance calmly from operators who chase deadlines isn't access to the rules. The rules are public. It's the operating discipline of owning the calendar internally — knowing what's coming next, having a named owner for each item, building the work into the monthly rhythm rather than treating each deadline as an emergency.

This piece is the reading guide to the full compliance calendar — what to do with it, how to turn it into an operating rhythm, and what an actually-disciplined annual cycle looks like for a Singapore SME.

The full calendar at a glance

Our detailed compliance calendar with deadlines per obligation lives at /resources/sg-compliance-calendar. What follows is the operator reading of that calendar — how to think about it, not what's on it.

Three categories of deadline

Calendar-fixed deadlines

A small number of obligations land on fixed calendar dates regardless of your company's structure:

  • 30 November — Form C-S / C filing deadline for the Year of Assessment
  • 1 March — IR8A employee earnings submission via Auto-Inclusion Scheme
  • 14th of each month — CPF contributions for the prior month

FYE-relative deadlines

Most ACRA and IRAS deadlines are calculated from your company's financial year end. So your FYE choice shifts these:

  • 3 months after FYE — ECI filing
  • 6 months after FYE — AGM (where applicable)
  • 7 months after FYE — Annual Return to ACRA

Event-driven deadlines

Triggered by something happening, not by the calendar:

  • 14 days for changes of officers, registered office, share allotments / transfers
  • 30 days for charges over assets, GST registration when crossing the S$1M threshold
  • 1 month after GST accounting period end for GST F5 (quarterly for most)

The rhythm of an organised year

For a Singapore private company with 31 December FYE, here's what a disciplined year looks like:

January

  • Year-end financial close (extending from December close)
  • Prepare for IR8A submission (if employees)
  • CPF for December — due 14 January

February

  • IR8A submission preparation
  • CPF for January — due 14 February
  • Begin tax computation for prior YA

March

  • IR8A submission — by 1 March
  • ECI filing — by 31 March
  • GST F5 for Q1 (Jan-Mar period) preparation

April

  • GST F5 Q1 filing — by 30 April
  • CPF, payroll, monthly close cycle

May-June

  • Routine monthly close, monthly CPF
  • Annual Return preparation (due 31 July for 31 Dec FYE)
  • If AGM applicable: schedule and prepare

July

  • Annual Return filing — by 31 July
  • GST F5 for Q2 (Apr-Jun) — by 31 July
  • AGM (or document dispensation)

August-October

  • Routine monthly close, monthly CPF
  • Tax computation finalisation for Form C-S / C

November

  • Form C-S / C filing — by 30 November
  • GST F5 for Q3 (Jul-Sep) — by 31 October (so done in October)

December

  • Year-end close preparation, stock-takes, accruals
  • CPF for November — due 14 December

For companies with a different FYE, shift the FYE-relative items but keep the calendar-fixed ones (30 November, 1 March, 14th-of-each-month) in place.

Who owns what

The split that works for most Singapore SMEs:

  • Company secretary: ACRA filings (AR, event-driven officer/share/address changes), statutory registers, AGM paperwork or dispensation
  • Accountant / bookkeeper: ECI, Form C-S / C, GST F5, IR8A, monthly close
  • HR / operations lead: CPF, payroll, work-pass renewals, MOM compliance
  • Owner: sign-off on filings, review of compliance status, decisions on structural items (FYE change, AGM dispensation)

When ownership isn't clear, things slip. Most missed deadlines we walk into start with “I thought the accountant was handling that” or “wasn't that the secretary's job?” — fix the ownership map first.

The discipline that turns deadlines into non-events

Four habits that compound:

  1. Monthly close on time, every month. Annual filings depend on monthly discipline. If close drags, ECI drags, AR drags, Form C-S drags.
  2. Calendar visible to everyone involved. Compliance calendar shared between secretary, accountant, owner. Upcoming items visible 4-6 weeks in advance.
  3. Buffer time before deadlines. Target filing 2 weeks before the deadline. The last-minute filing is the one that finds an unexpected problem.
  4. Annual review of the calendar itself. Each year, sit down once and confirm the calendar is current — thresholds have shifted, rules have changed, schemes have updated. The calendar is a living artifact.

What changes are coming

Two regulatory changes worth tracking for Singapore SMEs over the next few years:

  • InvoiceNow phased rollout for GST (voluntary registrants from 1 April 2026, then phased to all GST-registered by 2031). Will eventually simplify F5 mechanics.
  • Local Qualifying Salary increases (S$1,800/month from July 2026). Affects foreign worker quota and Workfare eligibility calculations.

Common questions about the SG SME compliance calendar

What happens if I miss a deadline?

Most deadlines have a fixed composition fee or penalty for late filing, escalating with the length of delay. Persistent or significant non-compliance can escalate to director debarment (for ACRA matters) or back-assessment (for tax matters). The cost of voluntary late filing is much less than discovered non-compliance.

Can I outsource the whole compliance calendar?

Yes — most Singapore SMEs do. A corporate services firm typically handles ACRA, an accountant handles IRAS, payroll provider handles CPF. Acuitas's integrated service covers all four ownership areas on a single calendar with one point of contact.

How do I know my provider is actually tracking deadlines?

Three tests: do they tell you about an upcoming deadline 4-6 weeks before it lands, or 2 days before? Can they produce the current-year compliance calendar on request? Have they proactively raised any compliance changes (like InvoiceNow) before you asked? If yes to all three, they're tracking properly.

Does the calendar change if my FYE isn't 31 December?

FYE-relative deadlines shift; calendar-fixed deadlines don't. So your AR is 7 months after your FYE — not 31 July. But Form C-S is always 30 November, CPF is always the 14th of each month, IR8A is always 1 March.

What's the single most often-missed filing?

In our experience, ECI. Owners assume the waiver applies without checking the criteria. By the time IRAS issues an estimated assessment, the 3-month window is long past. See our piece on ECI filing for the detail.

What we doAcuitas runs the full compliance calendar for clients — ACRA, IRAS, CPF, MOM — on a single calendar we own. Tracked, reminded, filed on schedule. See tax & compliance and corporate secretary for the underlying services.

Compliance shouldn't be exciting. When it is, something has slipped upstream. The discipline that makes it boring is the same discipline that lets the rest of the operation grow without back-office drag.

— The Acuitas team