Bermuda corporate income tax filing requirements apply to Bermuda Constituent Entities (BCEs) that are within the scope of the island’s 15% corporate income tax regime. For affected multinational enterprise (MNE) groups, compliance involves more than submitting an annual return: groups may also need to register, make installment payments, submit supporting forms and retain records that support their tax calculations.
This guide explains the main filing steps, the deadlines to plan for, and the information a group should prepare. The rules can depend on the group’s facts, accounting period and applicable administrative guidance. Confirm the requirements for your entity with the Corporate Income Tax Agency (CITA) or a qualified Bermuda tax adviser before filing.
Who must comply with Bermuda corporate income tax?
Bermuda’s CIT regime is designed around in-scope multinational enterprise groups and their Bermuda Constituent Entities. The general scope threshold is consolidated annual revenue of at least €750 million in at least two of the four fiscal years immediately preceding the tested fiscal year, subject to the detailed rules and any applicable exclusions.
Being incorporated or operating in Bermuda does not, by itself, mean every business is subject to the regime. A group should first establish whether it meets the revenue test, identify its Bermuda entities and assess whether any exclusions or special rules apply. The analysis may require reviewing consolidated financial statements, group structure and the relevant fiscal years.
What is the Bermuda corporate income tax rate?
The headline Bermuda CIT rate is 15%. The tax is generally calculated by reference to adjusted net income under the regime’s rules, rather than simply applying 15% to accounting profit or gross revenue. Adjustments, elections, credits, losses and other provisions can affect the final amount.
Accordingly, a simple multiplication of accounting income by 15% should not be treated as a filed tax calculation. Groups should document the applicable tax base and the methodology used to arrive at their liability.
Key Bermuda corporate income tax filing requirements
- Determine scope. Test the MNE group against the revenue threshold and identify the Bermuda Constituent Entities that fall within the rules.
- Confirm the fiscal year. Record the accounting period end for the group and each relevant entity. Deadlines are calculated by reference to the fiscal year, so the correct period matters.
- Complete registration and portal access. Confirm that the relevant entity or filing group has completed any required CITA registration and that authorised users can access the electronic filing system.
- Prepare installment calculations and disclosures. Assess whether installments are due, calculate the required amounts under the applicable rules and prepare any required installment-payment information.
- Prepare the annual CIT return. Reconcile the tax computation to the relevant financial information and complete the return and supporting disclosures required by CITA.
- Pay the balance and retain evidence. Arrange payment by the applicable due date, retain submission and payment confirmations, and keep the records supporting the return.
Bermuda CIT filing deadlines
The general annual return deadline is the last day of the tenth month following the end of the fiscal year, adjusted where that date is not a business day in Bermuda. For a calendar-year group whose fiscal year ended on 31 December 2025, CITA identifies 2 November 2026 as the filing deadline. This is a practical example of why filers should check the official date rather than simply counting ten months and assuming the calendar date is final. Always confirm the deadline for the group’s own fiscal year and any later CITA announcement.
Final tax payable is generally due by the annual return deadline. Groups should allow time for internal review, approvals, portal submission and payment processing rather than treating the due date as the start of the filing process.
Installment payments: what to plan for
In-scope groups may be required to make CIT installment payments during the fiscal year. The general schedule includes a first installment due by the last day of the eighth month of the fiscal year and a second installment due by the fifteenth day of the twelfth month. For a calendar-year taxpayer, these dates ordinarily correspond to 31 August and 15 December.
Installment requirements and amounts can depend on the applicable tax rules and the group’s circumstances. Groups should not rely solely on prior-year payments or an informal estimate. Review the current CITA forms and instructions, including any required disclosure of the calculation methodology, and reconcile installments against the final annual liability.
For a calendar-year taxpayer in 2026, the first installment date falls on 31 August 2026 and the second on 15 December 2026. Check the latest official guidance for any transitional provisions, filing requirements or changes that apply to the relevant period.
Return forms and schedules
CITA’s return process includes Form 100, the online CIT return, together with the applicable schedules. The standard route uses Form S-101 and its instructions (Form I-101), plus any required secondary schedules. A qualifying group that makes the de minimis exemption election may use the simplified schedules, Form S-102, with Form I-102 instructions, where the conditions are met. Opening tax loss carryforward schedules (Form S-103) may also be relevant. Check CITA’s current return page for the latest versions and availability before preparing the submission.
Do not assume every group uses the same workbook. The applicable schedule set depends on the group’s elections and facts. Review the instructions alongside the online return and make sure the completed schedules are uploaded as required.
How to file through the CITA portal
CIT filings are handled electronically through the official CITA portal. Before the filing window, confirm that the organisation’s account and authorised representatives are in place. Prepare the return data and supporting calculations offline where practical, then follow the portal’s current submission instructions.
After submission, save the acknowledgement, a copy of the return and any payment confirmation. If the portal identifies validation errors or requests additional information, address them promptly and keep a record of the response.
Documents and information to prepare
- Consolidated financial statements and evidence supporting the €750 million revenue test.
- Group structure charts and details of Bermuda Constituent Entities.
- Fiscal-year end dates and relevant accounting-period information.
- Tax computations, reconciliations and supporting schedules for adjusted income.
- Installment calculations, payment records and any required methodology disclosures.
- Details of applicable elections, adjustments, credits, losses or exclusions.
- Portal access details, filing authorisations and prior submission acknowledgements.
The precise documents required will depend on the return and the group’s circumstances. Maintain a clear audit trail linking figures in the return to source records and calculations.
Common compliance mistakes to avoid
- Using the wrong fiscal year: filing and installment dates depend on the relevant fiscal period.
- Confusing revenue with taxable income: the €750 million threshold is a scope test, not the tax base.
- Leaving installments until year-end: missed interim dates can create compliance issues even if the annual return is not yet due.
- Submitting without reconciliation: ensure return figures agree with the group’s records and documented tax adjustments.
- Relying on outdated forms: use the latest CITA forms and filing instructions for the relevant period.
- Failing to retain evidence: keep submission receipts, payment confirmations and supporting workpapers.
Build a filing calendar and assign responsibility
A practical compliance process starts well before a statutory deadline. Assign an owner for the scope assessment, data collection, tax computation, review, portal submission and payment. For groups with multiple Bermuda entities, document whether information is being prepared centrally or by each entity and establish a consistent review process.
Set internal dates earlier than the statutory deadlines. Allow time to resolve differences between accounting records and tax workpapers, obtain sign-off from the appropriate finance or tax personnel, and resolve portal access issues. Keep a calendar that includes installment dates as well as the annual return and payment deadline. If the group’s fiscal year differs from the calendar year, recalculate each date rather than copying a calendar-year schedule.
Where an adviser prepares or reviews the return, agree on responsibilities and deliverables in advance. The group should still retain access to the underlying records and copies of the filed return and payment evidence.
Practical filing checklist
- Confirm the group meets the scope test and identify relevant Bermuda entities.
- Verify the fiscal year-end and calculate each applicable deadline.
- Confirm registration and portal access.
- Prepare installment calculations and required disclosures.
- Complete and review the annual return using current CITA instructions.
- Submit electronically, pay amounts due and archive confirmations.
Related Bermuda tax resources
For related background, read BermudaFin’s Bermuda Corporate Income Tax guide, which provides broader context on the regime, and its Bermuda government financial outlook for related fiscal policy coverage. For authoritative filing forms, dates and portal instructions, use the CITA website. Professional guidance may also be useful; see Deloitte’s Bermuda CIT return forms and filing instructions and EY’s summary of the final administrative regulations.
Frequently asked questions
What is the annual Bermuda CIT return deadline?
The general deadline is the last day of the tenth month following the fiscal year-end. Confirm the exact date and any current extensions with CITA.
Is Bermuda CIT charged at 15%?
The headline rate is 15%, but the taxable base is determined under the regime’s detailed rules. It is not necessarily equal to accounting profit.
Are installment payments required?
In-scope groups may have installment obligations. The general dates are the last day of the eighth month and the fifteenth day of the twelfth month of the fiscal year; check the current rules and forms for your circumstances.
Where is the return filed?
Returns are submitted electronically through the official CITA portal at cita.bm.
This article is general information, not legal, tax or accounting advice. Bermuda CIT obligations can change and depend on the group’s facts. Verify the current requirements with CITA or a qualified adviser.
