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US Tax & Cross-Border Support for UK Tech Startups
Supporting UK startups navigating US investment, US expansion, and cross-border growth with coordinated tax, bookkeeping, and finance support.
A common complaint we hear from founders expanding internationally is that they now need to manage multiple entities, multiple jurisdictions, and multiple advisors. By bringing US and UK accounting and tax support together, Onside helps founders and finance teams navigate the practical tax and operational challenges that come with building across both markets.
A common complaint we hear from founders expanding internationally is that they now need to manage multiple entities, multiple jurisdictions, and multiple advisors. By bringing US and UK accounting and tax support together, Onside helps founders and finance teams navigate the practical tax and operational challenges that come with building across both markets.
Supporting Startups Across the UK and US
We understand that the US market presents significant opportunities for UK startups, from accessing new customers to raising capital from US investors. It also introduces a different set of tax and compliance requirements, many of which are unfamiliar to founders and finance teams operating internationally for the first time.
As businesses scale internationally and new entities are formed, finance and tax processes become more complex and often require coordination across different UK and US advisors, accounting platforms, and time zones.
Onside supports startups through these transitions with practical, founder-focused support designed around the realities of scaling technology businesses. Our UK-based US tax experts work alongside our accounting team to provide a single advisor for your finance function so that you can spend more time building.
As businesses scale internationally and new entities are formed, finance and tax processes become more complex and often require coordination across different UK and US advisors, accounting platforms, and time zones.
Onside supports startups through these transitions with practical, founder-focused support designed around the realities of scaling technology businesses. Our UK-based US tax experts work alongside our accounting team to provide a single advisor for your finance function so that you can spend more time building.
Who We Support
Who we work with
Our US services team primarily supports:
VC-backed technology startups and scale-ups
UK businesses expanding into the US
Companies operating with UK- and US-headed structures
Startups who have completed a “Delaware flip”
Founder-led businesses raising US investment
Finance teams managing cross-border operations
Challenges We Solve
Expanding into the US without creating unnecessary complexity
For many startups, US expansion happens quickly:
A new customer base
US hires
Investor requirements
A Delaware parent company
A US subsidiary
Cross-border operations
As businesses scale internationally, finance and tax requirements become more complex. Many founders find themselves navigating unfamiliar reporting obligations across multiple jurisdictions, often without knowing what is required or recommended for their business and circumstances.
US reporting requirements are often broader than businesses expect, and issues typically arise not from intentional non-compliance, but from not realising a filing or reporting obligation existed in the first place.
Onside supports startups through these transitions with practical, founder-focused guidance designed around the realities of growing technology businesses.
US reporting requirements are often broader than businesses expect, and issues typically arise not from intentional non-compliance, but from not realising a filing or reporting obligation existed in the first place.
Onside supports startups through these transitions with practical, founder-focused guidance designed around the realities of growing technology businesses.
US Tax Compliance
We support startups with ongoing US tax filing and reporting requirements, including:
Entity classification election
EIN application
US federal and state income tax returns
Federal and state registrations
Cross-border reporting requirements
Cash repatriation planning
Delaware flips and restructuring support: We help founders understand and navigate the practical implications of restructuring under US parent entities.
Cross-border accounting and tax support:
Operating across the UK and US often means managing multiple entities, filing obligations and finance processes across jurisdictions.
Onside helps start-ups manage these ongoing obligations through practical bookkeeping, tax, and operational finance support designed around growing cross-border businesses.
US bookkeeping support: We provide bookkeeping and operational finance support for US entities as part of a broader cross-border finance function.
Our support is designed to help startups maintain accurate financial records and operational visibility as they scale internationally.
Cross-border accounting and tax support:
Operating across the UK and US often means managing multiple entities, filing obligations and finance processes across jurisdictions.
Onside helps start-ups manage these ongoing obligations through practical bookkeeping, tax, and operational finance support designed around growing cross-border businesses.
US bookkeeping support: We provide bookkeeping and operational finance support for US entities as part of a broader cross-border finance function.
Our support is designed to help startups maintain accurate financial records and operational visibility as they scale internationally.
Why Onside
Built around startup growth: Onside works closely with VC-backed technology startups and scale-ups and understand the operational demands that come with international growth.
UK and US Context: As an US Certified Public Accountant (CPA) who has lived in the UK for over a decade, Devan works closely with founders navigating both systems and understands the practical challenges that arise when operating across jurisdictions.
UK and US Context: As an US Certified Public Accountant (CPA) who has lived in the UK for over a decade, Devan works closely with founders navigating both systems and understands the practical challenges that arise when operating across jurisdictions.
Clear, commercially focused advice: Cross-border tax issues can become technical quickly. Our approach is to provide straightforward guidance that helps founders and finance teams make informed decisions without unnecessary complexity.
Single, unified advisor: Many businesses entering the US find themselves working with separate advisors across multiple jurisdictions. By combining US tax expertise with Onside's existing accounting support, we help provide a more joined-up view of your cross-border finance and compliance requirements.
Single, unified advisor: Many businesses entering the US find themselves working with separate advisors across multiple jurisdictions. By combining US tax expertise with Onside's existing accounting support, we help provide a more joined-up view of your cross-border finance and compliance requirements.
How We Work
Discovery and assessment
We start by understanding your structure, operations, current and future funding plans, and US exposure.
Coordination and implementation
We work alongside founders and existing advisors to identify filing requirements, operational considerations, and areas requiring ongoing support.
Ongoing support
As your business evolves, we continue supporting your cross-border finance and tax requirements as part of a long-term relationship.
Supporting founders building across borders
Whether you are preparing for US expansion, restructuring for investment, or managing an existing UK-US group structure, Onside can help support your next stage of growth.