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Connect through IRAS’ Seamless Filing from Software (SFFS) workflow: choose an accounting product listed in IRAS’ ASR+ registry with CIT pre-fill, tax conversion and Form C-S submission, map your chart of accounts to IRAS data elements, authorise an Approver in Corppass, review the generated return and schedules, and submit Form C-S from the software. The software communicates with IRAS through APIs; Corppass still authenticates the authorised filer.
What “connecting to IRAS” actually means
SFFS does not turn a bookkeeping program into a general-purpose tax portal. It is a defined filing workflow for eligible Singapore companies. Your accounting system remains the place where transactions and accounts are maintained. When the tax return is prepared, the software converts accounting data into IRAS’ prescribed tax fields, creates the return and supporting schedules, authenticates the authorised person through Corppass, and sends the Form C-S data to IRAS through APIs.
IRAS describes the architecture this way: “The entire filing process including Corppass authentication is linked to IRAS’ systems via Application Programming Interfaces (APIs), which acts as intermediaries that allow 2 applications to talk to each other.” The practical result is that you do not re-key every figure into myTax Portal when your product supports SFFS Form C-S filing.
Corppass remains essential. The person who declares the return must have the appropriate corporate tax authority. A software connection also does not remove the company’s legal duty to file, retain records or answer IRAS queries.
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Check which corporate tax form applies first
Do not start by mapping accounts. First establish whether the company can use Form C-S, Form C-S (Lite) or must file Form C. The simplified forms are available only when their conditions are met.
| Form | Eligibility or scale | Important conditions | Return detail |
|---|---|---|---|
| Form C-S (Lite) | Annual revenue of $200,000 or below | Straightforward tax matters | Six essential fields |
| Form C-S | Singapore-incorporated company with annual revenue of $5 million or below | Income taxed at the prevailing 17% rate and none of the specified exclusions apply | 18 fields |
| Form C | Companies outside the Form C-S conditions | Use this route when the company does not qualify for either simplified form | Financial statements, tax computation and supporting documents are required |
For Form C-S, the exclusions include claiming group relief, investment allowance, carry-back of current-year capital allowances or losses, and foreign tax credit or tax deducted at source. A company that fails any of the simplified-form conditions should not force its data into Form C-S merely because its accounting product offers a convenient button.
The $5 million and $200,000 thresholds and the 17% condition are stated in IRAS’ Form C-S overview, last updated 11 August 2026. Revenue should be assessed for the relevant basis period and tax year of assessment, using the company’s own records and tax position.
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Choose software that can complete the SFFS workflow
IRAS directs companies to the current ASR+ listing. A product being able to produce a profit-and-loss report is not enough; it needs the tax-specific capabilities required for electronic filing.
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| Capability to verify | Why it matters | Questions for the provider |
|---|---|---|
| ASR+ listing status | Identifies products recognised for the relevant IRAS software services | Is the product currently listed for the SFFS features you need? |
| CIT pre-fill | Pulls eligible corporate-income-tax data from maintained accounts into the return workflow | Which fields are pre-filled, and what remains manual? |
| CIT tax conversion | Converts accounting figures into IRAS tax data elements | How are tax adjustments and non-deductible items represented? |
| Form C-S submission | Sends the completed Form C-S to IRAS from the software | Does the feature cover the relevant year of assessment and the company’s edition or plan? |
| Chart-of-accounts mapping | Connects bookkeeping categories to IRAS-prescribed data elements | Are default mappings supplied, and can an accountant review or change them? |
| Corppass and API workflow | Provides the authentication and system connection needed for filing | What is the exact authorisation sequence and which user role is required? |
| Acknowledgement and audit trail | Creates evidence that the return was transmitted and records what was filed | Where is the acknowledgement stored, and can it be exported? |
| Form C support | Separates simplified-form filing from companies that need the full return | If the company cannot use Form C-S, what filing workflow and documents does the product support? |
| Vendor assistance | Helps resolve mapping, tax-conversion and authentication questions | Are setup instructions and assisted onboarding available? |
IRAS does not endorse a particular commercial vendor. Verify the listing and feature set directly with the provider before migrating or configuring a company’s books. Product menus and supported years can change even when the underlying SFFS process remains the same.
Prepare the company and accounts
Complete the books before starting tax setup
Record the company’s operating transactions in the selected accounting system first. The tax workflow depends on the underlying ledger: sales, purchases, payroll, expenses, fixed assets, financing and other entries should be posted for the relevant period. A tax conversion cannot correct incomplete bookkeeping.
Gather the people and identifiers
- Identify the person who will review and declare the return.
- Ensure that person can use Singpass and is connected to the company’s Corppass account.
- Have the company’s Unique Entity Number (UEN) or Entity ID available.
- Confirm the relevant year of assessment and filing deadline.
Decide whether a tax agent is needed
A company that qualifies for SFFS may still use an accountant or tax agent for review. Companies that must file Form C, or that have tax matters outside the simplified conditions, need the fuller filing process and supporting documents rather than an SFFS Form C-S submission.
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- Select an eligible product. Start with the ASR+ listing and confirm that the product provides CIT pre-fill, CIT tax conversion and Form C-S submission. Check the supported year of assessment and whether the service is enabled for the company’s account.
- Maintain complete accounting records. Post and reconcile the transactions for the filing period. Resolve obvious ledger errors before mapping; otherwise the generated tax figures will need avoidable rework.
- Map the chart of accounts once. Open the product’s tax or IRAS mapping area and assign each relevant ledger account to the prescribed IRAS data element. Some products provide default mappings. Treat defaults as a starting point: review revenue, cost, expense, asset, liability and equity classifications, and follow the provider’s mapping instructions where an account is ambiguous.
- Set the filing authority in Corppass. Give the responsible person the Approver role for Corporate Income Tax filing. The role must belong to the person who will authenticate and approve the submission, not merely someone who maintains the books.
- Generate and review the tax package. Run the product’s CIT pre-fill or tax-conversion process. It should produce a draft Form C-S, a profit-and-loss statement, a tax computation and supporting schedules. Compare the draft with the ledger and source records, check tax adjustments, and confirm that the company still meets Form C-S conditions.
- Declare and submit Form C-S. Use the software’s submission action, complete the Corppass authentication when prompted, and submit only after the authorised filer has reviewed the declaration. The software should display an acknowledgement after transmission.
- Save the evidence. Export or securely retain the acknowledgement and the generated profit-and-loss statement, tax computation and schedules. IRAS may request those documents even though the initial SFFS submission transmits Form C-S electronically.
Corppass, Singpass and myTax Portal: what you still need
Corppass is not bypassed by an accounting integration. It authenticates the corporate user who is allowed to file. The required Corppass role for this workflow is Approver for Corporate Income Tax filing.
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myTax Portal is the separate direct-filing route. For a myTax Portal filing, the user needs Corppass Approver authorisation for Corporate Tax (Filing and Applications), Singpass and the company UEN or Entity ID. SFFS users submit Form C-S from the accounting product instead, but should still keep their corporate access and authentication details current for other IRAS services, amendments or filings that are not handled by the product.
If authentication fails, check the exact Corppass entity, the user’s role and the UEN or Entity ID selected in the software. A bookkeeping administrator without the Approver authority can prepare data but cannot complete the corporate declaration.
Review the generated return before declaring
The most important control is the review between tax conversion and submission. Work through the generated documents as a package rather than checking only the headline profit figure.
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- Form C-S: confirm the company identity, year of assessment, revenue and tax figures.
- Profit and loss statement: tie totals back to the final ledger and investigate unexplained differences.
- Tax computation: check adjustments between accounting profit and taxable income, including items that the mapping or conversion has treated differently.
- Supporting schedules: ensure the schedules are complete and agree with the return.
- Eligibility: recheck the $5 million revenue ceiling, the 17% prevailing-rate condition and the exclusions before approval.
Do not assume a successful API transmission means the figures were correct. SFFS moves data between systems; the company and its authorised filer remain responsible for the tax position declared.
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Deadlines and the SFFS extension
| Filing situation | Deadline | Qualification |
|---|---|---|
| Form C-S, Form C-S (Lite) or Form C | 30 November each year | Annual corporate income tax filing deadline stated by IRAS |
| SFFS Form C-S for YA 2023 through YA 2027 | 15 December | IRAS automatically extends the 30 November deadline by 15 days; no separate request is needed |
Plan against 30 November unless the return is clearly within the SFFS Form C-S extension. Complete bookkeeping, mapping and review early enough to allow for a failed authentication, an account-mapping correction or a vendor service issue. The extension is an IRAS filing rule for the specified SFFS years, not permission to postpone record keeping or review.
What happens after submission
Keep the software acknowledgement as evidence of transmission. Retain the profit-and-loss statement and tax computation schedules because IRAS may request them. Companies generally must retain source documents, accounting records, schedules and bank statements for at least five years from the relevant year of assessment.
The filing obligation applies even when the company had no income or made a loss, unless IRAS granted a waiver. A zero-activity period therefore still requires the appropriate return or an approved waiver; do not leave the filing untouched simply because the ledger has no profit.
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Common failure points and practical fixes
The product cannot submit Form C-S
Check the current ASR+ listing and confirm that Form C-S submission, rather than only accounting or tax-report generation, is enabled. If the company must file Form C, do not use a simplified SFFS route as a workaround; arrange the full filing workflow and required documents.
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The generated tax figures look wrong
Return to the chart-of-accounts mapping and compare each material account with the IRAS data element selected. Then reconcile the ledger, review tax adjustments and regenerate the draft. Keep a record of mapping changes so a later reviewer can understand why a figure changed.
The filer cannot authenticate
Verify that the person is the Corppass Approver for Corporate Income Tax filing, is using the correct company entity and has the necessary Singpass access. For direct myTax Portal filing, confirm the separate “Corporate Tax (Filing and Applications)” authorisation and the correct UEN or Entity ID.
Schedules are missing or incomplete
Do not declare until the profit-and-loss statement, tax computation and supporting schedules generated by the product have been reviewed. Ask the provider how its tax-conversion module handles the affected account or schedule, and obtain professional tax assistance when the issue concerns an eligibility exclusion or complex adjustment.
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That does not automatically remove the filing duty. File the required return unless IRAS has granted a waiver, and retain the records supporting the reported figures.
The deadline is close
Prioritise completed bookkeeping, account mapping, Corppass authority and review of the generated documents. Submit as soon as the authorised filer is satisfied, save the acknowledgement immediately and do not rely on an extension unless the return meets the stated SFFS Form C-S conditions for the relevant year.
SFFS versus direct myTax Portal filing
| Aspect | SFFS from accounting software | myTax Portal |
|---|---|---|
| Where data is prepared | Accounting product with CIT pre-fill and tax conversion | IRAS’ direct online filing service |
| Submission covered here | Form C-S submission from the software | Direct corporate tax filing using the portal |
| Authentication | Corppass Approver authentication through the software’s API workflow | Corppass Approver for “Corporate Tax (Filing and Applications),” plus Singpass and UEN or Entity ID |
| Preparation work | Maintain books, map accounts once, review generated return and schedules | Prepare and enter or upload the required filing information in the portal |
| Evidence after filing | Software acknowledgement, profit-and-loss statement and tax computation schedules | Portal filing confirmation and retained supporting records |
The choice is operational rather than a relaxation of tax rules. Both routes require accurate records, the correct form and an authorised person.
A repeatable annual control checklist
- Confirm the company’s year of assessment and whether a waiver exists.
- Determine Form C-S (Lite), Form C-S or Form C eligibility.
- Check that the accounting product remains on the ASR+ listing for the required SFFS features.
- Close and reconcile the relevant accounting period.
- Review the chart-of-accounts mapping and update changed accounts.
- Confirm Corppass Approver authority and Singpass access.
- Generate the Form C-S, profit-and-loss statement, tax computation and schedules.
- Review eligibility, tax adjustments, totals and supporting evidence.
- Submit by 30 November, or by 15 December where the automatic SFFS extension applies for YA 2023–YA 2027.
- Save the acknowledgement and retain records for at least five years from the relevant YA.
Bottom line
Use SFFS only when the company and return qualify. An ASR+ product with CIT pre-fill, tax conversion and Form C-S submission can remove duplicate data entry, but the company still has to maintain complete books, map accounts correctly, provide Corppass authority, review every generated schedule and preserve evidence after filing.
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