Contents
Mid-year is a significant compliance control point for companies operating in Taiwan, sitting between the annual income-tax and corporate-reporting cycle and the provisional profit-seeking enterprise income-tax return. Recurring business-tax, withholding and payroll obligations continue throughout this period, so a mid-year review needs to reconcile several moving parts rather than address a single filing.
This guide sets out a mid-year compliance calendar and the actions to take at each control point, from closing the annual reporting cycle to preparing for the provisional tax filing. It also covers tracking operational changes and the evidence to have ready for review.
- A mid-year review should confirm that the annual reporting cycle is complete, with financial statements, resolutions and tax returns retained as consistent and retrievable evidence.
- Withholding is generally due to the National Treasury by the 10th of the following month, while business tax is ordinarily reported every two months within 15 days of the following term.
- The provisional profit-seeking enterprise income tax filing period runs from 1 to 30 September, with e-filing software released in mid-August and a separate October deadline for paper attachments.
- Payroll data should be reconciled against labour pension and health insurance records to ensure mandatory contributions are correctly reflected.
- Operational changes such as new hires, director appointments or revised supplier terms are easier to manage as a tracked register than as year-end exceptions.
Mid-year compliance calendar in Taiwan
The following calendar sets out the recurring and annual obligations that fall within a standard calendar-year reporting cycle, along with the corresponding mid-year action. Companies with special fiscal years, zero-rated VAT treatment or regulated activities should adjust the calendar to their own filing arrangements.
| Timing | Compliance milestone | Mid-year action |
|---|---|---|
| Every month | Tax withheld in the previous month is generally payable to the National Treasury by the 10th day of the month. | Reconcile payroll, contractor and other withholding categories against payment evidence, and investigate differences before the next close. |
| Every two months (ordinarily) | Business tax is reported within fifteen days of the start of the following term. Businesses with zero-rated transactions may report monthly. | Reconcile sales and purchase invoices, credit notes and imports against the tax ledger, and document any outstanding invoices or classification questions. |
| May (in a standard fiscal year) | Profit-seeking enterprise annual income-tax returns are normally filed from 1 to 31 May. (The deadline moves to the next business day where the 31 falls on a weekend or public holiday.) | Confirm that the filed return, financial statements and underlying tax reconciliations agree with management reporting. |
| From 15 August | For 2026, Ministry of Finance (MOF) released the provisional income-tax e-filing and payment software from 15 August. | Test access credentials, assign preparer and approver roles, and assemble electronic supporting documents. |
| 1 to 30 September | The provisional profit-seeking enterprise income-tax return filing period runs for the current fiscal year. | Finalise the tax forecast, agree the filing approach with advisers and complete filing and payment approvals. |
| By 12 October (where paper attachments are used) | The MOF release specifies this date for paper supporting documents after online provisional filing. | Maintain a submission log and proof of delivery, and use the electronic route where appropriate. |
With the milestones set out above, the sections that follow work through the actions needed at each point, starting with the annual reporting cycle.
Close the annual reporting cycle with supporting evidence
The annual reporting cycle is the natural starting point for a mid-year review, since the obligations here need to be confirmed complete before attention turns to the recurring and upcoming items. Taiwan’s annual accounting final reports and statements include the annual business report, financial statements and the statement of surplus-earnings distribution or deficit offsetting. These documents are prepared at the end of the fiscal year and approved by shareholders or ratified by the shareholders meeting. Companies must prepare and place them at the main office, and the competent authority may require filing within a specified period, as set out in Taiwan’s corporate compliance requirements.
The practical question is not only whether the annual steps were completed, but also whether the evidence is complete, internally consistent and retrievable. The responsible team should retain the following:
- Approved financial statements
- Shareholder and board materials, where applicable
- Signed resolutions
- Tax returns and audit documentation
- The reconciliation from statutory accounts to management reporting
This is also an appropriate point to update internal registers for any changes in shareholding, directors, responsible persons, address, business scope or other corporate particulars.
A brief records review helps identify inconsistencies across financial, corporate and tax records, such as differences in ownership, dates or reported amounts. Discrepancies are best resolved before provisional-tax preparation rather than carried into the autumn filing period.
Keep indirect tax, withholding and payroll data aligned
Once the annual cycle is settled, attention shifts to the obligations that continue in parallel throughout the year. Tax and payroll should not be treated as separate administrative streams, since both rely on the same underlying records.
Business tax
Business tax is ordinarily reported every two months, with filings due within the first 15 days of the following term, and businesses with zero-rated transactions may report monthly. This makes complete invoicing, correct tax treatment and timely credit-note processing year-round controls rather than month-end tasks.
Withholding
Withholding deserves the same discipline. Tax withheld in the previous month is generally remitted by the 10th of each month. However, payments to non-residents or profit-seeking enterprises without a fixed place of business can be subject to a separate 10-day rule, measured from the date of withholding. Businesses paying cross-border service fees, royalties, interest, dividends or non-resident compensation should review the payment flow and supporting tax analysis before releasing funds.
Payroll and statutory contributions
Payroll records should be checked against the information reported to labour, pension and health insurance systems. Under the current labour pension system, employers are required to deposit at least 6% of a covered employee’s monthly wages into an individual pension account, regardless of any additional voluntary contribution from the employee. The National Health Insurance (NHI) general premium rate is 5.17%, with the outcome depending on the relevant salary basis, contribution ratios and dependants.
The compliance task is not simply to rerun a payroll calculation, but to confirm that new hires, exits, compensation changes, unpaid leave, bonuses and benefits have been correctly reflected across the connected systems.
Prepare for the provisional income tax filing
The recurring controls covered above feed directly into the year’s largest filing event. Profit-seeking enterprises file provisional income-tax returns from 1 to 30 September. For the 2026 fiscal year, the MOF made the e-filing and payment software available for download from 15 August, a date confirmed annually and worth checking against the current year’s announcement. Enterprises with special fiscal years are treated differently and should confirm their own timetable rather than assume the standard calendar-year window.
Build the tax forecast
August is an ideal time to prepare a structured tax forecast. Finance teams should reconcile year-to-date management accounts with the most recent annual return, identify material changes in revenue, margin, foreign-exchange results, provisions, fixed assets, financing, related-party charges and non-recurring items, then escalate technical questions to a Taiwan tax adviser. The goal is to decide the filing and payment approach early, rather than finalise the calculation in the final week.
Prepare the filing process
Eligible enterprises without a special fiscal year can complete online filing using simplified electronic authentication or a Ministry of Economic Affairs certificate authority IC card. Where supporting documents are required, they can be converted to PDF and uploaded through the filing software before the filing deadline. Paper attachments submitted to the tax office have a separate deadline of 12 October for 2026, a date confirmed annually by MOF rather than fixed. Companies should identify access owners, confirm signatory authority, test technical credentials and establish a clear review and approval process before September.
Turn operational changes into tracked compliance actions
Not every mid-year issue is a tax or payroll matter. The first half of the year commonly brings changes that are difficult to spot in a year-end close, such as:
- A new revenue channel or revised supplier arrangement
- A changed contract signatory
- A mobile employee or director appointment
- A relocation
- A new use of customer or employee data
A mid-year review should convert these changes into a short, owned register that records the affected compliance process, the document owner, the action required and the target completion date.
The review should consider whether changes affect company registration, invoicing, withholding, payroll reporting, insurance and pension data, statutory records, licences or privacy controls. Regulated and listed companies should also consider sector-specific requirements. Companies with special fiscal years, cross-border transactions or non-standard employment arrangements should confirm their position with specialist advisers.
Practical mid-year evidence checklist
The table below sets out the documentation that should be ready for review in each control area, and why it matters if a question arises later in the year.
| Control area | Evidence to have ready | Why it matters |
|---|---|---|
| Corporate income tax | Prior annual return, year-to-date tax forecast, adjustment schedule, provisional-tax workpapers and approval record | Supports a controlled transition from the annual return to the September provisional filing |
| Business tax and invoicing | Sales and purchase invoice reconciliations, credit-note log, tax-ledger tie-out and filing and payment confirmations | Demonstrates that recurring reporting is supported by complete transaction records |
| Withholding | Payment register, withholding calculation, Treasury payment proof and non-resident payment review | Helps identify timing and classification issues before the next payment date |
| Payroll and statutory contributions | Payroll-to-general-ledger reconciliation, employee-change log, labour pension records and health insurance support | Confirms that people data and payment data are consistent across systems |
| Governance and financial reporting | Financial statements, annual business report, shareholder or board approvals where applicable, registers and minutes | Shows that annual reporting was completed and that governance changes are traceable |
| Operational change register | List of new products, contracts, offices, personnel arrangements, data uses and related-party transactions | Turns business change into assigned compliance actions before year-end |
Conclusion
A Taiwan mid-year review moves through a clear sequence: confirming the annual reporting cycle is properly closed and evidenced, keeping business tax, withholding and payroll reconciled as they recur through the year, and using that groundwork to prepare for the provisional tax filing before the September window opens.
Tracking operational changes as they happen, rather than at year-end, keeps this cycle from being disrupted by routine business updates. Where the provisional tax forecast is complex or the filing approach is unclear, specialist input at this stage is generally more useful than a rushed calculation closer to the deadline.
How Acclime can help with mid-year compliance
Acclime supports companies operating in Taiwan through the mid-year compliance cycle, from reconciling withholding and business tax records to preparing the provisional income tax filing and reviewing governance documentation. The team can also help structure an operational change register so routine updates are tracked as they occur rather than surfaced at year-end. Contact Acclime to discuss a mid-year compliance review tailored to the entity’s fiscal year and filing arrangements.
