Onside Accounting is a High-Touch Finance Partner Purpose-Built for Tech Startups.

We blend exceptional client service with accounting, tax advisory and CFO services to support founders from pre-seed through to Series C. As an embedded finance partner, we operate alongside ambitious tech teams who expect speed, clarity and confidence in their decision-making as they build and scale.

Our human-led, tech-enabled team combines modern systems with hands-on oversight, ensuring technology enhances performance without replacing accountability. Founded in 2021, we’ve grown to a team of almost 40 supporting 170+ venture-backed businesses, with most of our clients coming through referral. We’re proud to have won New Firm of the Year (2024) and Client Service Award (2025) at the Accounting Excellence Awards.

Every client works with a dedicated three-person finance team, led by Chartered Accountants, providing consistent, responsive support without being passed between providers. That core team is backed by on-demand specialists across tax advisory, technical accounting, venture growth support and fractional CFO services.

With one accountable, fully integrated team, there are no gaps between bookkeeping, compliance and strategic advice – everything sits in one place to support better decision-making and scalable growth in fast-moving tech businesses.