- ECI filed within the three-month IRAS deadline, tracked from your financial year end.
- Named account manager who knows your company's financials before the filing window opens.
- Bookkeeping through Xero means ECI figures come from reviewed, up-to-date records.
- Same-day response time if you have questions before submission.
- Part of a full corporate tax service covering bookkeeping, financial statements, and IRAS filings.
Missing the ECI deadline costs more than the filing
IRAS requires most Singapore-incorporated companies to file an Estimated Chargeable Income within three months of their financial year end. The ECI is not your final tax return: it is a declaration of your estimated revenue and chargeable income for the year just closed. But IRAS treats a missed filing seriously, and the penalties accumulate quickly. For a company already managing payroll, accounting, and corporate secretarial obligations, one more deadline is one more thing that can slip. The ECI deadline is not discretionary, and IRAS has limited tolerance for late filers, even first-timers.
Your numbers, reviewed before they go to IRAS
A correct ECI starts with accurate books. Duellix handles bookkeeping and full accounting through Xero, which means the figures going into your ECI are drawn from records your account manager has already reviewed, not reconstructed at the last minute from a folder of receipts. That continuity matters. When your accounting and tax filing sit with the same team, there is no hand-off gap where errors can enter. Your ECI reflects your actual financial position, not a rough estimate produced under deadline pressure by someone who has never seen your accounts.
One account manager, not a rotating helpdesk
Every Duellix client has a named account manager. That person knows your company structure, your financial year end, and your filing history. When your ECI window opens, they act without you having to prompt them. Duellix's stated same-day response time means that if you have a question about your estimate or want to review the figures before submission, you get an answer the same day. No chasing, no tickets, no explaining your situation from scratch to a different person every time.
ECI sits inside a full corporate tax service
ECI filing is part of Duellix's broader corporate tax offering, which covers the full compliance cycle: bookkeeping, unaudited financial statements, and corporate tax filings with IRAS. Handling everything together means your ECI, your Form C-S or Form C, and your financial statements are all consistent with each other. That consistency is what IRAS expects, and it is what protects you if your filing is ever queried. Piecemeal compliance is where errors hide. Keeping it under one roof removes that risk.
The ECI deadline is not discretionary, and the penalties accumulate quickly for companies that let it slip while managing everything else at once.
How ECI filing works with Duellix
Confirm your financial year end
Your ECI filing window opens immediately after your financial year closes. Duellix records your year-end date at onboarding and tracks the three-month filing deadline from there. No manual reminders needed on your side.
Review your year-end accounts
Your account manager works from your Xero-maintained books to derive the revenue and chargeable income figures required for the ECI. If your accounts are handled by Duellix, this step is largely internal. If you maintain your own books, you share the relevant figures and your account manager reconciles them before filing.
Confirm the estimate with you
Before anything goes to IRAS, your account manager shares the estimated figures with you for sign-off. You see the numbers before they are submitted. If something looks off, that is the moment to catch it, not after the filing is accepted.
File with IRAS before the deadline
Duellix submits the ECI to IRAS on your behalf within the three-month window. You receive confirmation once the filing is accepted. The obligation is closed, documented, and on record.
Benefits
Deadline tracked without prompting
Duellix monitors your financial year-end and the three-month ECI window from the moment you onboard. You do not need to set a reminder or chase your filing team to get started.
Figures drawn from maintained books
When Duellix handles your bookkeeping through Xero, the ECI is built from records already reviewed by your account manager, not assembled at the last minute. Accuracy follows from continuity, not from a rushed year-end exercise.
Same-day response if questions arise
If you want to discuss your estimated figures or query a number before submission, Duellix's same-day response commitment means you get an answer before the deadline, not after it.
Consistent with your full tax position
ECI is filed alongside your Form C-S or Form C and your financial statements by the same team. No inconsistencies between filings that could attract IRAS scrutiny.
Who this service is for
Overseas founder running a Singapore entity remotely
A foreign entrepreneur who incorporated in Singapore but operates from abroad cannot easily monitor IRAS deadlines across time zones. Duellix acts as the on-the-ground compliance partner, tracking the ECI window and filing without requiring the founder to be present or to navigate the IRAS portal themselves. The entire filing is handled remotely, with confirmation sent once IRAS accepts the submission.
Singapore SME switching from a previous provider
A small business that has outgrown its previous corporate services firm, or simply found the relationship unresponsive, brings its accounts and tax history to Duellix. The account manager reviews the prior year's filings, establishes the correct financial year-end timeline, and takes ownership of the next ECI deadline. No gap in coverage during the transition.
Growing company with accounting and tax under one roof
A company scaling its headcount and revenue needs its ECI to reflect accurate, up-to-date books, not a year-end scramble. Because Duellix manages bookkeeping through Xero alongside the ECI and broader corporate tax filing, the figures are consistent across every submission to IRAS. The finance team spends time on the business, not on reconciling documents between separate providers.
ECI filing questions answered
What is ECI and why does my Singapore company need to file it?
ECI stands for Estimated Chargeable Income. It is a declaration you submit to IRAS within three months of your financial year end, stating your estimated revenue and taxable income for that year. It is separate from your final corporate tax return (Form C-S or Form C), which comes later. Most Singapore-incorporated companies are required to file it, and IRAS penalises late or missing submissions.
Can Duellix file the ECI if another firm handles my bookkeeping?
Yes. If your books are maintained elsewhere, your account manager will work from the figures you provide to prepare and submit the ECI. That said, the most accurate ECI comes from books that are already current and reviewed, which is why many clients find it cleaner to consolidate bookkeeping and tax filing with Duellix.
Is ECI filing included in Duellix's corporate tax service?
ECI filing is part of Duellix's broader corporate tax offering, which covers the full compliance cycle including bookkeeping, unaudited financial statements, and corporate tax filings with IRAS. Your ECI, financial statements, and Form C-S or Form C are handled by the same account manager, keeping all submissions consistent with each other.
What if my company qualifies for an ECI filing waiver?
IRAS grants waivers to companies that meet specific criteria, typically related to revenue thresholds and nil chargeable income. Your account manager will assess whether your company qualifies for a waiver and advise accordingly, so you are not filing unnecessarily or missing a waiver you are entitled to.