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For a Singapore company already keeping its records in compatible accounting software and eligible to file Form C-S, IRAS Seamless Filing From Software (SFFS) can reduce duplicate data entry. For direct filing and a wider range of corporate tax tasks, myTax Portal is the more complete route. Neither is universally better: eligibility, the software’s supported features and your existing workflow determine the practical choice.
For YA 2026, IRAS sets the corporate income tax return deadline at 30 November 2026. Check the current filing requirements for your company and year of assessment before choosing a route. The return type and the actual features included in your software package matter as much as the product’s general claim to support tax filing.
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At a glance
| Name | Best for | Key distinction | Checked |
|---|---|---|---|
| IRAS myTax Portal | Companies filing directly or handling corporate tax tasks beyond a Form C-S submission | Direct IRAS access to filing and other corporate tax services | Nov 2026 |
| Compatible accounting software using SFFS | Eligible companies that already maintain records in supported software and want to prepare and submit Form C-S there | Can reuse data held in the software; supported features vary by product | Nov 2026 |
What is the difference between myTax Portal and corporate tax software?
myTax Portal is IRAS’s direct online route for corporate tax filing and account services; SFFS is a way to prepare and submit a supported Form C-S through compatible accounting software. “Corporate tax software” is a broad label, so do not assume any accounting or tax product can connect to IRAS or file the return you need.
IRAS lists myTax Portal services for filing ECI, Form C-S, Form C-S (Lite), Form C, or a dormant-company return. The portal also supports document submissions, filing-status and notice checks, access to donations and account information, tax payments, GIRO management, assessment revisions or objections, and contact with IRAS through myTax Mail. See IRAS’s Basic Guide to Corporate Income Tax for Companies for its corporate tax service overview.
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SFFS connects eligible companies’ accounting software to IRAS through an API-based process that includes Corppass authentication. Depending on the software and package, supported features may include corporate tax data pre-fill, tax conversion and Form C-S submission. IRAS’s guide to using accounting software to prepare and file Form C-S explains the route. The availability of one feature does not establish that every package supports all the others.
In practical terms, the portal is an IRAS destination for filing and follow-up services. SFFS is an integration option within a compatible software workflow. The integration can reuse information already held in the accounting system, but it does not make the accounting product a substitute for every service in myTax Portal. A company may therefore use software to prepare and submit a supported return and still return to the portal to check status, review a notice, make a payment or handle another tax matter.
What does “seamless filing” mean in practice?
It means that supported data in compatible software can be used to prepare a Form C-S submission and transmit it to IRAS through an API-based connection. Corppass authentication is part of that connection. Depending on the product, the software may provide tax data pre-fill, tax conversion, submission, or a combination of these features. “Seamless” does not mean that all accounting data is automatically correct for tax purposes, that all products offer the same functions, or that a company can skip its review.
IRAS describes SFFS as a way to simplify filing and reduce the risk of errors. Its stated benefits relate to reusing information and reducing manual entry or transposition. The company still needs to confirm that the return is the right one, review its contents and check that IRAS received the submission.
Who can use SFFS, and which return does the company need?
SFFS is relevant when the company is eligible to file Form C-S and its chosen software supports the required filing features. IRAS describes Form C-S as a simplified return for qualifying Singapore-incorporated companies, including conditions that revenue is S$5 million or below, income is taxable only at the normal corporate tax rate, and the company has no disqualifying claims or allowances.
Companies that do not qualify for Form C-S file Form C. Do not treat the S$5 million revenue ceiling as the only eligibility test: the other conditions matter too, and the applicable rules should be confirmed for the relevant Year of Assessment. IRAS’s corporate income tax guide and its current filing guidance are the appropriate starting points.
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Do not decide based on revenue alone. Check each stated Form C-S condition for the company and the relevant YA, including the nature of its taxable income and whether it has claims or allowances that disqualify it. The eligibility conditions affect which return the company may file; the fact that a particular software product has a Form C-S feature does not make a company eligible to use that form.
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Likewise, a product that supports accounting or tax work generally is not necessarily a product that supports the specific IRAS filing function you need. Confirm the return type first, then look at the current IRAS listing and the exact software package. If eligibility or the correct return type is unclear, resolve that with current IRAS guidance before choosing a filing workflow.
When is myTax Portal the better choice?
Choose the portal when you need direct IRAS filing, a return type beyond the SFFS Form C-S workflow, or other IRAS account tasks in the same place. It is also a straightforward option if the company does not already keep its records in compatible software and adopting a new system solely for a filing workflow would add effort.
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- You need a broader corporate tax service: myTax Portal covers more than filing a supported Form C-S. You can also use it for services such as ECI filing, document submission, payments, GIRO and assessment matters.
- The company is not eligible for Form C-S: Form C is the return for companies that do not qualify for Form C-S, and myTax Portal lists Form C filing.
- Your software or package lacks the necessary SFFS feature: Do not assume “accounting software” means it can submit a corporate return. Check IRAS’s current ASR+ listing and the specific package’s supported features.
- You prefer a direct filing workflow: The portal lets an authorised user prepare and file through IRAS without relying on a software integration.
Direct filing in myTax Portal is the free option referenced in IRAS’s reader-style question about paying for accounting or payroll software just to file taxes. That does not establish that accounting software is free; its pricing depends on the product and package, which this comparison does not assess.
The portal can also be the simpler choice when a company needs to handle several parts of its tax administration in one place. For example, a company may need to submit a return, check a notice, make a payment or manage GIRO. Those are among the services IRAS lists for myTax Portal. A software filing feature may assist with preparing and submitting Form C-S, but you should verify rather than assume that it covers these additional account tasks.
For a company without compatible accounting software, compare the effort of adopting a new system—including setup and learning its workflow—with the direct portal route. No conclusion about which is faster or cheaper for every business follows from the availability of the integration. The relevant question is whether the software fits an existing business process and provides features the company will actually use.
When can accounting software with SFFS be a better fit?
SFFS can make sense when the company is already using compatible accounting software, qualifies for Form C-S and wants to avoid re-entering information that is already maintained in that system. It is a workflow benefit, not a guarantee of error-free filing or a promise of a particular time saving.
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IRAS says SFFS can reduce manual entry and transposition errors because information maintained in the software can be reused. It also says users can review the return in the software before submission. IRAS describes the process as simplifying filing and reducing the risk of errors; that is a potential benefit, not a claim that software detects every problem or removes the company’s responsibility to check its return.
Before choosing software for this reason, verify the details that affect your case:
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- Confirm the return type. Establish that the company qualifies for Form C-S for the relevant YA.
- Check the current ASR+ listing. Confirm the software is listed for the relevant SFFS capability rather than relying on a general claim that it supports tax or accounting.
- Check the exact package. Verify whether the package you would use supports the necessary data pre-fill, tax conversion and Form C-S submission features. IRAS notes that features vary by product.
- Review the filing and acknowledgement workflow. Find out how the software presents the return for review and what confirmation it provides after submission.
- Compare the full workflow, not just the filing screen. Consider whether you will still use myTax Portal for notices, payment, status checks or other IRAS services.
IRAS maintains information about Seamless Filing From Software for Businesses and Employers. A listing identifies supported features; it should not be read as IRAS endorsing a product for every company or as a recommendation of a particular package.
A practical SFFS review sequence
For a company that appears to qualify and already uses a listed product, the checks can be kept in a simple order:
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- Check eligibility before opening the filing workflow. Confirm that the company can file Form C-S for the relevant Year of Assessment, not merely that its software offers a Form C-S screen.
- Match the product listing to the feature needed. An ASR+ listing may identify features such as corporate tax data pre-fill, tax conversion and submission. Check which of those are available in the particular product and package.
- Authenticate the company’s access. The SFFS process involves Corppass authentication. Confirm that the person acting for the entity can access the workflow.
- Review the prepared return in the software. Reused information can reduce duplicate entry, but reviewing the return remains important. Do not treat a populated form as proof that each item is complete or correct.
- Submit and verify receipt. After filing, check for an acknowledgement or submission status in myTax Portal. This final check is part of the filing process, not an optional substitute for trusting that an integration worked.
This sequence separates three questions that are easy to conflate: whether the company qualifies for Form C-S, whether the software supports the relevant IRAS functions, and whether the submitted return was received. A positive answer to one does not answer the other two.
How should you compare the cost and effort?
Compare the cost of any software package with the administrative work it may remove from your existing process—not with an assumed tax-filing fee or an unverified savings figure. The portal provides direct filing, while software pricing and included features vary and are not established by the information available for this comparison.
If the company already pays for accounting software for bookkeeping, SFFS may be an additional workflow capability to check rather than a reason by itself to buy a new product. If you would adopt software only to submit a return, weigh the package’s cost and setup against filing directly in myTax Portal. There is no supported figure here for time saved, error reduction or cost-effectiveness, so a precise return-on-investment claim would be misleading.
Also consider the tasks that happen after submission. A software route focused on Form C-S preparation and submission may not replace the portal for payments, notices, documents, objections or other account matters. Confirm what the particular product offers, and plan to use myTax Portal where needed.
A useful comparison is therefore not simply “free portal versus paid software.” Ask whether the company already pays for the accounting system, whether its package includes the SFFS features required, and how much duplicate data entry the integration may remove from the current process. If the software is being considered only for one tax submission, include setup and any ongoing package cost in the decision. If the company already uses the system for its records, assess the tax-filing feature as one part of the existing workflow rather than assuming it requires a separate purchase.
Do not infer a guaranteed financial saving from fewer manual entries. The workflow may reduce re-entry and transposition risk, but the available figures do not establish a time-saving percentage, a measured reduction in errors, or a cost advantage for one route. Compare actual package terms and actual workflow needs; avoid treating a general integration capability as proof of a specific return on investment.
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What access and deadline details should you plan for?
Employees and tax agents acting for a company need the company’s Corppass authorisation to file through myTax Portal; SFFS also involves Corppass authentication. Confirm that the person responsible has the right access before the filing deadline rather than leaving authorisation until the last step.
For YA 2026, IRAS states that the corporate income tax return deadline is 30 November 2026. The deadline applies to the relevant filing season; check IRAS’s Corporate Income Tax Filing Season 2026 information for current details. Filing through software does not change the need to meet the applicable IRAS deadline.
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Access planning applies whichever route is chosen. The user should know who is responsible for preparing the return, who is authorised to act for the company, and who will check the completed submission. With SFFS, authentication is part of connecting the software workflow to IRAS; with myTax Portal, employees or tax agents must be authorised through Corppass before acting for the company.
Do not confuse the return deadline with the time needed to prepare or review the return. The stated YA 2026 date is the filing deadline. It is sensible to leave time for access coordination, checking the selected return type, reviewing the return and confirming submission rather than treating the integration as a reason to wait until the final day.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do you decide?
Start with eligibility and the return type, then choose the route that fits the company’s existing records and follow-up needs. Use this decision sequence:
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- If it needs Form C, use a route that supports Form C. myTax Portal lists Form C; the SFFS workflow covered here is for Form C-S.
- If it qualifies for Form C-S, check existing software. If the company already uses a listed compatible product, confirm that its exact package supports the filing features needed.
- Account for all corporate tax tasks. Decide whether the company needs the portal for payments, notices, status, documents or assessment matters regardless of where the return is prepared.
- Arrange access and review time. Make sure the employee or agent has Corppass authorisation, and leave time to check the return and its submission status.
After a software submission, IRAS says users can check for an acknowledgement or submission status in myTax Portal. Keep that confirmation step in the company’s process; transferring data and submitting it through an integration does not replace verifying that the filing was received.
Three common situations
- The company already uses listed accounting software and qualifies for Form C-S. SFFS may be a practical route if its exact package supports the features needed. The main potential advantage is reusing information already maintained in the system; the company should still review the return and check its status after filing.
- The company needs Form C or a broader mix of IRAS services. Start with myTax Portal because IRAS lists Form C filing there and the portal covers other corporate tax tasks. Do not select a Form C-S integration based solely on a software vendor’s general tax-filing description.
- The company does not already use compatible software. Compare the cost and effort of adopting a package against filing directly through myTax Portal. The integration is not automatically worthwhile if the business would be acquiring software just for a filing feature, and no general cost-saving figure can settle that decision.
These are workflow illustrations, not exemptions from checking the current rules. A company’s return eligibility, exact software capability and Corppass access should all be confirmed before filing.
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What is the practical verdict?
For a company that already uses compatible accounting software and qualifies for Form C-S, SFFS can be the more convenient preparation-and-submission route because it can reuse maintained data. For a company needing Form C, broader IRAS services, or a direct route without adopting compatible software, myTax Portal is the more suitable choice. Many businesses may use both: software for a supported Form C-S workflow and myTax Portal for status checks or other corporate tax services.
The practical decision is conditional, not a contest with a universal winner. Confirm the return, check current ASR+ feature details for the exact package, compare the filing process with the company’s existing bookkeeping workflow, arrange Corppass access, and leave time to review and confirm the submission. For YA 2026, keep the 30 November 2026 deadline in view.
Frequently Asked Questions
Does IRAS endorse every accounting product listed for SFFS?
No. The ASR+ listing identifies software and supported filing features; it does not mean IRAS endorses a product for every business or recommends a particular package. Confirm that the current listing and the product’s own package details cover your company’s needs.
Can accounting software using SFFS submit Form C?
The SFFS workflow described by IRAS is for preparing and filing Form C-S, not Form C. Companies that do not meet Form C-S eligibility should confirm the filing route for Form C through IRAS.
Will SFFS calculate the company’s tax liability automatically?
The supported information describes features such as tax conversion, pre-fill and Form C-S submission, but it does not establish that every product calculates a final tax liability or does so in the same way. Check the exact software package and review the completed return before it is submitted.
Can a company use myTax Portal after filing through SFFS?
Yes. IRAS says users can check for an acknowledgement or submission status in myTax Portal after filing through software. The portal also remains relevant for corporate tax services beyond the software’s supported filing workflow.
Is filing directly through myTax Portal free?
IRAS’s reader-style question contrasts paying for accounting or payroll software with filing through myTax Portal, which is the direct filing option. Software prices and package features vary, so check the provider’s current terms rather than assuming a product is free or that it costs a particular amount.
Does using SFFS remove the need to review the return?
No. IRAS describes SFFS as reusing information and reducing manual entry and transposition risk, and says the return can be reviewed in the software before submission. Those benefits do not guarantee that every item is correct or remove the need for the company to review its return.
What is the YA 2026 corporate income tax return deadline?
IRAS gives 30 November 2026 as the corporate income tax return deadline for YA 2026. Confirm the current filing-season details with IRAS and allow time for access, review and submission confirmation.
Do employees or tax agents need permission to file for a company?
Yes. IRAS requires an employee or third-party tax agent to be authorised through Corppass to act for the company in myTax Portal. SFFS also involves Corppass authentication, so arrange the relevant access before filing.
