Onside Accounting
Tax Manager
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Growth Tax Manager
Reporting to – Head of Tax
Salary (depending on experience & qualifications) - £55,000 to £65,000
Location – Remote, working from home (UK)
About us
The UK tech sector is growing fast, and Onside has built a genuinely differentiated way to support it, combining premium client service with modern systems, automation, and commercial thinking.
We're Accountants and business advisers for VC-backed technology startups and scale-ups, acting less like a traditional back-office provider and more like a finance co-founder, giving founders a dedicated team for bookkeeping, statutory accounts, tax advisory, R&D tax credits, and fractional CFO support.
We're proud to be backed by Multiplier, a San Francisco–based, AI-native professional services company built to transform our industry, giving us the tools and investment to build technology into everything we do.
Key Responsibilities
The Growth Tax Manager is responsible for:
- Taking ownership of a portfolio of tax work for start-up and scale-up clients and acting as a key point of contact.
- Preparing EMI valuation reports and supporting clients with EMI and ERS advice/compliance, including HMRC submissions and related advisory work.
- Preparing EIS1/SEIS1 compliance filings and supporting advance assurance applications.
- Reviewing Corporation Tax returns and associated computations on an ad hoc basis, working alongside the accounts team who manage preparation, and providing technical input to ensure accuracy and identify risks or planning opportunities.
- Undertaking tax research, reviewing legislation and HMRC guidance, and forming well-reasoned conclusions based on independent analysis.
- Producing high-quality written advice, reports, and technical correspondence for clients and internal use.
- Building strong client relationships, supporting efficient delivery, and identifying improvements in processes, technology, automation, and wider commercial opportunities across the tax function.
- Providing ad hoc tax support as and when required, including VAT enquiries, restructurings, remuneration planning, employment-related tax issues, and wider corporate tax matters.
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Personal Specification
Qualifications
- ATT and/or CTA qualified, or fully qualified ACA, CA, ACCA, or equivalent.
- If you are studying towards a tax qualification (such as CTA), you may be eligible for support in completing this through commercial learning – self-study in your own time and not during working hours. The company will bear the cost of this training and related examinations (first sit only).
Skill and Experience
- 5+ years’ experience in a UK practice-based tax role.
- Strong experience in EMI/share schemes, and EIS/SEIS, and wider corporate tax compliance and advisory work.
- Experience with VAT would be beneficial.
- Experience of owning a defined portfolio of tax work and managing multiple deadlines in a fast-paced environment.
- Strong client-facing experience, with the confidence to work directly with founders, senior stakeholders, and finance teams.
- Strong technical tax capability, including legislative and case law research, HMRC guidance review, tax analysis, and report writing.
- Extensive structured home-working experience (non-covid) – as a minimum, contractually agreed hybrid homeworking at least two days each week.
- Strong IT skills and the ability to adapt quickly to new systems, software, and processes.
- A strong interest in working with fast-growing technology start-ups and scale-ups.
- You must be resident in and have a legal right to work in the UK.
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What’s on offer?
- Home-based, flexible working
- Employee Assistance Program (EAP), offering wellbeing support and advice.
- Additional days’ paid leave for your birthday
- 25 days annual leave + bank holidays
- All new joiners are paired with a buddy, to ensure you feel supported from day one!
- Staff referral bonus scheme
- Ongoing training, support, and progression opportunities
- Annual performance reviews with discretionary bonus scheme
- Twice-yearly company meet-ups
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