For companies and LLPs within the applicable phase, submitting the income-tax return isn’t the final step. Specified supporting documents must also be filed through the Malaysian Income Tax Reporting System, or MITRS.
The supporting documents are generally due within 30 days after the statutory return-filing deadline—not 30 days after an early submission.
Who needs to check MITRS?
HASiL’s YA2026 MITRS filing programme explains the section 82B process. Companies and limited liability partnerships (LLPs) entered the phased requirement from year of assessment (YA) 2025.
Confirm the entity, year of assessment and current filing programme before preparing the pack. Don’t assume that instructions for another taxpayer category or year apply unchanged.
Which documents are required?
The programme identifies four categories:
- Financial statements. These may be audited statements or qualifying unaudited statements, depending on the entity’s valid position.
- Detailed tax computation. This shows how accounting results are adjusted to reach the tax position.
- Capital-allowance and balancing schedules, where applicable. These support claims and adjustments relating to qualifying assets.
- Detailed incentive computations, where claimed. These explain the basis and amount of relevant tax incentives.
“Where applicable” matters. Don’t create an incentive schedule for a company that made no such claim. Equally, don’t omit a required supporting schedule because the final return contains only the total.
How does the deadline work?
The documents are due within 30 days after the statutory return-filing deadline. That doesn’t automatically mean 30 days after the date on which you happened to submit an early return.
Establish the official filing deadline first, then check any formal extension or grace period under the relevant programme. Record the evidence for a changed deadline rather than assuming that extra time for the tax return automatically changes every other filing date.
Fictional case study: an early return does not move the reference point
For this date illustration, assume a company’s applicable statutory return deadline has been established as 30 June 2026, with no extension or concession changing the position. It submits its return on 10 June 2026.
| Event | Date in this fictional case |
|---|---|
| Return actually submitted | 10 June 2026 |
| Statutory return deadline | 30 June 2026 |
| MITRS deadline: 30 days after that deadline | 30 July 2026 |
The finance manager had entered 10 July by counting from the early submission. The adviser corrects the deadline to 30 July, while keeping an internal target of 20 July to allow time for checks. The pack can be submitted earlier once the return has been filed and the documents are ready.
The company checks the final financial statements against its tax computation, submits the applicable documents and retains the MITRS acknowledgement with the return receipt. It marks the task complete only after confirming submission, rather than when the PDFs are emailed to the adviser.
The lesson is to separate the date you filed from the deadline that starts the MITRS clock. The dates above are assumptions for this example, not a filing calendar for every company or LLP.
Prepare one controlled filing pack
Create a submission-control sheet:
| Control item | Details |
|---|---|
| Entity and tax number | |
| Year of assessment | |
| Statutory return deadline | |
| Concession or extension and evidence | |
| Return submission date and acknowledgement | |
| Financial-statement version | |
| Tax-computation version | |
| Capital-allowance schedules applicable? | |
| Incentive computations applicable? | |
| Reviewer | |
| Authorised submitter and MyTax role | |
| MITRS acknowledgement location |
Version control matters. The statements and detailed computation in the final pack should agree with the return that was filed. If a figure changes during review, update the connected documents and assess whether the filed return also needs correction.
The MITRS FAQ says only one document can be uploaded in each field and the total file size is limited to 20 MB for each taxpayer for each YA. Where one category contains several schedules, prepare the combined PDF for that field carefully. Check the entity and YA on every document, keep each PDF readable and confirm the live upload instructions before submission.
Agree who does each part
Before the deadline, confirm which authorised MyTax user or tax agent will submit the pack and that the person can access MITRS. Decide:
- who prepares each document;
- who checks that it agrees with the return;
- who has authority and system access to submit;
- who monitors the deadline; and
- where the acknowledgement is retained.
Don’t assume the accountant, company secretary or tax agent is handling the filing unless it is included in the engagement.
MITRS and SSM lodgement are separate
Financial statements lodged for company-law purposes aren’t automatically treated as submitted through MITRS. The systems, legal purposes and timing are different.
Audit-exempt companies also shouldn’t assume MITRS disappears. The programme expressly contemplates relevant unaudited financial statements. Does an Audit-Exempt Company Still Need Accounts? explains the separate preparation and SSM duties.
Make the filing easy to track
Put the MITRS deadline beside the return deadline, build the supporting pack while the computation is fresh and keep one reviewed version with both acknowledgements. If the underlying documents are incomplete, start with the accountant document checklist and assign the missing items before the upload date.
Sources checked on 24 September 2026 against HASiL’s YA2026 filing programme. Confirm the current programme, deadline concessions, file specifications and authorised MyTax role for the entity before submission.