K10 in owner-managed companies: key principles to plan early

The K10 return is central for many owner-managed companies and affects dividend taxation. This page provides a practical overview to help you prepare documentation and avoid common misunderstandings.

Early planning significantly improves both confidence and reporting quality.

Common pitfalls around threshold calculations and documentation

Challenges often appear when historical records are incomplete or documentation is not maintained continuously. This makes decision-making around dividends more uncertain.

  • Maintain traceable records over time
  • Run preparatory checks before filing season
  • Document important ownership and company changes
  • Seek advisory input before major decisions

How to improve readiness for your next K10 filing

A practical approach is to connect K10 preparation to ongoing accounting and annual planning routines. This reduces late adjustments and unnecessary uncertainty.

Bluewave can help coordinate bookkeeping, closing and filing documentation in one process.

Need help with K10?

We can help you understand what applies to your company before filing.

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K10 FAQ

Who needs to file K10?

K10 is typically filed by owners of closely held companies reporting dividend allowance.

What is dividend allowance?

Dividend allowance is the portion of dividends taxed under the main closely-held-company framework.

Do I need payroll basis?

In some cases yes, depending on which rule set is used and your company profile.

Can I use saved allowance from previous years?

Yes, previously saved allowance may affect your current K10 calculation.

When should K10 preparation start?

Ideally well before filing deadlines to validate history and underlying data.

Can you help with practical execution?

Yes, Bluewave can help review documentation and make the process clear.