Skip to main content
Acuitas

What we do · Base layer

Tax and compliance handled cleanly, so you don't have to chase deadlines.

We don't make tax sound exciting. We make it calm, controlled, and handled — on a calendar we own — so it stops being something you have to worry about.

Corporate income tax

ECI, Form C-S, Form C — and what they actually mean for you.

Singapore's corporate income tax is assessed on a preceding-year basis — so YA 2025 looks at income earned in FY 2024. The headline rate is 17%, but for most SMEs the effective rate is lower thanks to the Partial Tax Exemption and (for qualifying new companies) the Start-Up Tax Exemption on the first portion of chargeable income. We compute it properly for your structure, file ECI and the annual return, and explain what's actually due.

  • —Corporate income tax computation
  • —Estimated Chargeable Income (ECI)
  • —Form C-S / Form C-S Lite / Form C filing
  • —Year-end tax planning
  • —IRAS correspondence and queries

GST & InvoiceNow

GST done right — and ready for InvoiceNow.

We handle GST F5 returns, input/output tax reviews, and IRAS correspondence. We also get you ready for InvoiceNow — Singapore's nationwide e-invoicing network, run by IMDA on the Peppol framework — which IRAS is progressively requiring GST-registered businesses to use for GST reporting.

  • —GST registration assessment (the S$1M turnover threshold and prospective tests)
  • —GST F5 filing
  • —Input and output tax reviews
  • —GST-relevant record-keeping
  • —InvoiceNow readiness for GST businesses

How we work

The compliance calendar is our problem, not yours.

Compliance calendar

We hold the deadlines — ACRA, IRAS, GST — and remind you in advance, not on the day.

Record-keeping discipline

Receipts, invoices, contracts, and supporting documents organised properly, so an IRAS query never becomes a scramble.

Quiet, controlled handover

When a filing is due, the work is already done. You sign off. That's it.

Common questions

What owners ask us about tax and GST.

What is Singapore's corporate income tax rate?

Singapore's headline corporate income tax rate is 17%. However, the effective rate is often lower for SMEs thanks to the Partial Tax Exemption (PTE), which exempts a portion of the first S$200,000 of chargeable income, and (for qualifying new companies) the Start-Up Tax Exemption (SUTE). The actual rate depends on your structure and circumstances.

What does 'preceding-year basis' mean for Singapore corporate tax?

Singapore assesses corporate income tax on a preceding-year basis. That means the Year of Assessment (YA) 2025 looks at income earned in the financial year ending in 2024. ECI is filed shortly after the financial year ends, and the annual return (Form C-S/C) is filed later in the assessment year.

When does a Singapore business need to register for GST?

GST registration becomes compulsory when a business's taxable turnover exceeds S$1 million — either on a retrospective basis (looking back at the past 12 months) or on a prospective basis (looking forward at the next 12 months, where you can reasonably expect to exceed the threshold). Voluntary registration is also possible.

What is InvoiceNow and do I need to use it?

InvoiceNow is Singapore's nationwide e-invoicing network, run by IMDA on the Peppol framework. IRAS is progressively requiring GST-registered businesses to use it for GST reporting. The phase-in schedule applies first to newly incorporated GST-registered companies and then to existing GST-registered businesses. We help clients get ready.

Take it off your plate

Stop chasing tax deadlines.

Tell us where you are in your filing cycle. We'll take the calendar from here.