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Corosar – an accounting firm in Helsinki

We take care of your accounting so you can focus on your work. Accounting Firm Corosar is based in Helsinki and serves clients across Finland.

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Or call +358 50 590 7166

Corosar is an accounting firm for sole traders in the Helsinki metropolitan area

Clear accounting at a fixed price

We’re always easy to reach when you need help.

Our mission and value promise

At Corosar, everything revolves around one thing: your success. Our mission is to make your everyday business life easier, so you can focus on what truly matters — doing your work without unnecessary administrative stress.

We’re here for you

Saat oman kirjanpitäjän, joka tuntee yrityksesi ja puhuu selkokieltä. Me olemme tavoitettavissa ja autamme silloin, kun tarvitset.

No unnecessary waiting

This is the space to describe the service and explain how customers or clients can benefit from it. It’s an opportunity to add a short description that includes relevant details, like pricing, duration, location and how to book the service. 

We respond quickly and keep things moving.

This is the space to describe the service and explain how customers or clients can benefit from it. It’s an opportunity to add a short description that includes relevant details, like pricing, duration, location and how to book the service. 

What about quality, speed and reliability?

This is the space to describe the service and explain how customers or clients can benefit from it. It’s an opportunity to add a short description that includes relevant details, like pricing, duration, location and how to book the service. 

Key figures

100K

A clear and comprehensive solution for sole traders who want everyday business to run smoothly

Selkeä ja kattava ratkaisu toiminimiyrittäjälle, joka haluaa huolettoman arjen

200

A clear and comprehensive solution for sole traders who want everyday business to run smoothly

Selkeä ja kattava ratkaisu toiminimiyrittäjälle, joka haluaa huolettoman arjen

5

A clear and comprehensive solution for sole traders who want everyday business to run smoothly

Selkeä ja kattava ratkaisu toiminimiyrittäjälle, joka haluaa huolettoman arjen

Meet our team

Ilja Mikkonen, Accounting Firm Corosar

Ilja Mikkonen

Bachelor of Business Administration, Accounting

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Abstract Blue Background

Liisa Mikkonen

Bachelor of Business Administration (BBA)

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Our story

Corosar was founded in 2021 with a simple idea: to create an accounting firm that does things a little differently — a bit better, a bit smarter, and above all, more genuinely and proactively. Our goal was to build a service where entrepreneurs don’t feel alone with paperwork, receipts, and tax matters.

At Corosar, it’s not just about bookkeeping — it’s about partnership. We want to be the trusted person you can always call when something is on your mind, someone who takes care of things on your behalf so you can focus спокойно on what you do best: growing your business.

Supported by the Finnish Taxpayers’ Association
Member of Helsinki Entrepreneurs
Partner of the Finnish Association of Accounting Firms

Our partners

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