---
title: "IRAS Filing Dates — When to File Your Tax Return | TaxInfo.sg"
description: "Know exactly when IRAS filing windows open and close for personal income tax, corporate tax, ECI, and GST. Plan your filing with confidence."
keywords: "IRAS filing dates, IRAS filing window, when to file tax Singapore, tax filing period Singapore"
url: "https://taxinfo.sg/iras-filing-dates"
language: "en"
---

Deadlines

#  IRAS Filing Dates

When filing windows open, when they close, and how to plan ahead. 

Who This Is For

Individuals and businesses who want to understand the IRAS filing windows — not just when filing is due, but when it opens and the best time to file.

TL;DR

Personal tax filing opens in March and closes April 18 \(e-filing\). Corporate filing via Form C-S/C is due by November 30 each year. ECI must be filed within 3 months of your financial year-end. Filing early often means faster processing and earlier refunds.

## Filing Windows at a Glance

Filing Type | Opens | Closes | Portal  
---|---|---|---  
Personal Income Tax \(e-filing\) | 1 March | 18 April | myTax Portal  
Personal Income Tax \(paper\) | 1 March | 15 April | By post  
Estimated Chargeable Income \(ECI\) | After FYE | 3 months after FYE | myTax Portal  
Form C-S / Form C | After ECI filed | 30 November | myTax Portal  
GST Return \(F5\) | End of accounting period | 1 month after period ends | myTax Portal  
  
## Personal Income Tax Filing

IRAS typically opens the e-filing portal in **early March**. You'll receive a notification \(SMS, email, or letter\) if you need to file. The e-filing window runs for about 7 weeks.

**Tip:** File early in March to avoid last-minute system congestion and to receive your Notice of Assessment sooner. If you're on the No-Filing Service \(NFS\), check that your pre-filled data is correct — you don't need to submit unless changes are required.

## Corporate Tax Filing

Corporate filing involves two steps:

  * **Step 1: ECI** — File within 3 months of your financial year-end. This is an estimate of your company's taxable income.
  * **Step 2: Form C-S/C** — File the actual corporate tax return by 30 November. This includes your audited/unaudited accounts and tax computation.

## GST Filing

GST-registered businesses file **quarterly** \(most common\) or monthly. The GST return \(Form F5\) must be submitted within **one month** after the end of the accounting period, even if there's no transaction to report.

## Key Takeaways

  * Personal tax e-filing window: March 1 – April 18
  * File early to avoid congestion and get your assessment faster
  * Corporate tax has a two-step process: ECI first, then Form C-S/C
  * GST returns are due monthly or quarterly depending on your filing frequency

## What To Do Next

[ This Year Tax Deadlines 2026 ](/tax-deadlines-2026) [ Full View Year-Round Tax Calendar ](/tax-calendar) [ File Now Personal Tax Filing Guide ](https://personal.taxinfo.sg) [ File Now Corporate Tax Filing Guide ](https://corporate.taxinfo.sg)