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About Us
Who We Are
Onside are Chartered Certified Accountants, Business Advisers and Tax Specialists supporting technology startups and high-growth businesses in the UK.
We empower the growth of technology startups through expert financial guidance, delivered by our expert team with a modern, flexible, and remote-first approach.
The company was founded by Martin Brennan, a fellow of the Association of Chartered Certified Accountants (FCCA). Since qualification, Martin has spent much of his career working in operational leadership and technical roles in high-growth accounting practices. Martin takes great pride in delivering high standards of work at all times and particularly enjoys developing people, with an excellent track record of converting aspiring young professionals into qualified accountants and tax advisors.
We empower the growth of technology startups through expert financial guidance, delivered by our expert team with a modern, flexible, and remote-first approach.
The company was founded by Martin Brennan, a fellow of the Association of Chartered Certified Accountants (FCCA). Since qualification, Martin has spent much of his career working in operational leadership and technical roles in high-growth accounting practices. Martin takes great pride in delivering high standards of work at all times and particularly enjoys developing people, with an excellent track record of converting aspiring young professionals into qualified accountants and tax advisors.
Our Vision
Onside's vision is simple. We want to be part of your story and we want you to be part of ours. We want our team and our clients to value what we do and more importantly, we want to enjoy it.
Our vision is reflected in our values:
Our vision is reflected in our values:
Growth
We are committed to growing - personally and as a team, and while supporting our clients growth.
Positivity
We strive to make every interaction we have constructive, with a proactive, positive mindset.
Togetherness
We support one another and celebrate both individual and team achievements as a collective.
Care
We provide high-quality work and demonstrate genuine care for our clients and colleagues.
Our Team
From incorporation to expansion, we deliver expert finance and tax support that scales with you – Giving founders clarity, confidence and control over their growth.
Meet The Team
Our Services
Onside offer a vast range of accountancy, tax and other advisory services -
Accounting & Tax
Keeping on top of your filing responsibilities with HMRC and Companies House.
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R&D Tax Credits
Manage your R&D tax credits application with the help of our expert advisors.
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