Corporate Tax Reform 2026: 15% Rate and Controls

The Ministry of Finance reform package states that the corporation tax rate increases to 15% with effect from January 1, 2026. The same package also connects the corporate change to dividend taxation and other incentive measures, so groups should not treat the company rate in isolation.

For finance teams, the key issue is not just the headline rate. It is the date from which forecasts, deferred tax views, cash-tax expectations and shareholder communications should be updated.

• Update budgeting and forecast templates for 2026 periods.
• Revisit deferred tax assumptions where relevant.
• Align internal policy notes with the published reform package.

Controllers should separate legacy 2025 assumptions from 2026 assumptions in management packs so the year-on-year comparison stays clean. If the company plans distributions, owner-manager remuneration or incentive grants, those items should be reviewed together rather than in separate silos.

Boards should also record why a given tax assumption was used. Minutes, forecast versions and shareholder memos become more valuable when a reform package changes multiple tax layers at once.

• Freeze the 2025 baseline before changing 2026 planning files.
• Document the policy date and board approval date.
• Review owner remuneration and dividend plans together.

This briefing is a planning note, not a legal opinion. Complex groups, mixed accounting periods, international structures and tax losses still need a case-specific review against the enacted law and detailed guidance.

The site calculator is useful for directional owner outcomes, but it cannot capture all fact patterns relevant to a real company filing.

A board-ready file should be readable by someone who was not in the room when the tax assumptions were chosen. In practice that means a forecast showing the old and new rate assumptions, one note on timing, one note on shareholder impact, and the source links used to support the change.

• Keep a saved pre-change baseline and a revised 2026 forecast.
• Record which tax assumptions affect budgeting and which affect legal approvals.
• Store distribution and remuneration notes in the same file if they are being considered together.