For businesses in Singapore, the annual tax season isn’t just about a routine task—it’s a compliance milestone. You can be responsible for managing a small team or a huge number of team members, staying informed about the income tax filing Singapore 2025 requirements is critical.
With IRAS introducing new digital filing rules in 2025, being prepared and having the right automation tools in place can help you avoid last-minute stress, filing errors, and unwanted penalties.
Let’s take a detailed look into the essentials that every business owner, finance manager, and HR executive should know about Income Tax Filing in 2025.
1. Key Tax Filing Deadlines to Note
The Inland Revenue Authority of Singapore (IRAS) sets strict deadlines for Singapore corporate tax filing. If any of these gets missed, it can cost to huge penalties that businesses will find it difficult to pay.
Below listed are the critical corporate tax submission deadline Singapore 2025:
Corporate Tax Return (Form C / C-S / C-S Lite)
- Due: 30 November 2025
- Even if there is no income generated, all companies must adhere to Income Tax Filing
Estimated Chargeable Income (ECI)
- Due: Within 3 months from the financial year-end
- If your financial year ends on 31 March 2025, the Singapore ECI filing is due by 30 June 2025.
- Small companies may qualify for an ECI filing waiver.
Employment Income Reporting (IR8A, IR8S, Appendix 8A, Appendix 8B, IR21)
- Due: 1 March 2025 via AIS
- It is considered essential for all employees (including directors and part-timers) who earned more than $500 during the year.
🔧 Simplify your reporting: Info-Tech’s Payroll Software works on automatically generating IRAS-ready documents, that comprises the Singapore IR8a form, Appendix 8A, and more. This prepares you ready and well informed before the deadline.
2. IRAS Auto-Inclusion Scheme (AIS): Mandatory for Most Employers
The Auto-Inclusion Scheme (AIS) requires businesses to submit employee income information directly to IRAS electronically. To support error-free reporting, this helps to pre-fill all the employee tax returns.
Who must join AIS in 2025?
- Businesses with five or more employees (including directors)
- All employers participating voluntarily in 2024 must continue for 2025
- New employers encouraged to enroll early
Tip: AIS is no longer optional for most SMEs. Manual submissions are being phased out, and IRAS is rapidly expecting businesses to adapt accordingly.
💡 Automation recommendation: Info-Tech’s HRMS integrates seamlessly with CPF and IRAS systems. This works on automation of tax, payroll and CPF submissions. It also works on reducing human error and saving valuable time during peak tax season.
3. What’s New in 2025?
The 2025 tax year brings multiple changes that every business owner must be well aware. There is a shift in these updates where it reflect IRAS’s broader push toward digitisation and stricter compliance monitoring.
Key changes include:
- Mandatory digital filing for all income types (no more paper-based forms, even for small businesses)
- Tighter enforcement for submission errors and late filings
- Higher penalties for incomplete or incorrect tax information
- Increased audits for companies with inconsistent or delayed records
Bottom Line: Filing manually or last minute in 2025 could cost more than just time—it may affect your compliance record.
Read More: Ways to Reduce Your Personal Income Tax for Singapore Tax Residents
4. Tips for a Smooth Process of Income Tax Filing
Ensuring accuracy and efficiency is more vital than just being tax-ready and meeting the personal income tax Singapore deadline. Follow these practical steps that will help your business and be prepared for the 2025 tax season:
✅ Start Early
Begin preparing documents and verifying employee income and expense reports at least 2–3 months before filing deadlines in Singapore.
✅ Reconcile Staff Income and CPF Contributions
Cross-check salary data with CPF submissions. Inconsistencies can raise complications with IRAS.
✅ Validate All Employee Information
Ensure accurate NRICs, job titles, income components (bonuses, allowances), and benefits-in-kind are reflected.
✅ Use IRAS-Approved Software
Verify that your payroll and HR systems support IRAS-approved formatting and direct submissions. This helps prevent rejected files and formatting errors.
✅ Keep Audit-Ready Records
Organise digital backups of key tax-related documents—such as ECI, IR8A forms, and Form C-S—for at least 5 years.
Final Thoughts: Don’t Leave Income Tax Filing to the Last Minute
Long gone are the days when Income tax filing was looked up as a stressful process. With the right tools and processes in place, you can streamline year-end reporting, reduce risks, and stay fully compliant with IRAS. Traditional methods like manual tracking, paper forms, and spreadsheet-based reporting are rapidly becoming outdated. In 2025, automation isn’t just about efficiency anymore. It is transformed to be critical requirement that helps to staying compliant and competitive.
Here’s How Info-Tech Can Help:
Our Payroll Software, Accounting Software and HRMS Are Built To Handle CPF, IRAS, and MOM Reporting Requirements—Making Your Year-end Processes Faster, Easier, and Error-free.
👉 Automate your tax preparation today with Info-Tech’s all-in-one HR & Payroll Solutions and avoid last-minute chaos. Stay compliant, stay confident.
Book A Free Demo To See How Our Solutions Can Work For Your Business!