A new generation of founders is building products faster than ever before. Tools like Cursor, Lovable, Replit, v0 and Claude are allowing non-technical entrepreneurs and technical ones moving at unprecedented speed to go from idea to working product in days rather than months. The category even has a name now: vibe coding.
But while the product side has been democratised, the finance side has not kept up. Most vibe coding founders are building on weekends, launching on Product Hunt, and figuring out the money stuff as they go. The problem is that getting the money stuff wrong early before you raise, before you issue shares, before your first investor signs — creates problems that are genuinely expensive to fix later.
This guide covers everything an AI-native founder needs to know about startup accounting, SEIS investor relief, R&D tax credits, company structure and finding the right accountant. Written for founders who understand prompts better than P&Ls.
Step 1: Incorporate Early — and Get the Structure Right
The first question most founders ask is “when do I need to set up a company?” The honest answer is earlier than you think ideally before you bring on a co-founder, issue any equity or take any investment.
Here is why it matters:
- Issuing shares before incorporation means issuing them informally – no legal protection, no clear ownership, messy to fix later
- SEIS and EIS investor reliefs only apply to qualifying limited companies – you cannot access them as a sole trader or partnership
- R&D tax credits are only available to limited companies — sole traders cannot claim
- IP ownership is cleaner in a company structure – your product belongs to the company, not to you personally
Setting up a limited company in the UK costs £100 and takes about ten minutes on Companies House. The more important question is not when to incorporate but how to structure it correctly from the start which brings us to shares, options and cap tables.
Step 2: Cap Tables — Get This Right Before Anyone Signs Anything
A cap table (capitalisation table) is a record of who owns what percentage of your company. It starts simple typically founder shares at incorporation and gets more complicated every time you issue shares, grant options or take investment.
The most common cap table mistake early-stage founders make is either not having one at all, or issuing shares informally before taking proper legal advice. Both create problems when investors arrive and start doing due diligence.
Founder shares at incorporation
When you incorporate, you issue shares. The typical setup for a two-founder startup is 50/50, but the split should reflect the actual contribution and commitment of each founder — including who is full-time versus part-time, who is contributing IP, and what happens if one founder leaves early.
Founder vesting where shares are earned over time rather than issued all at once protects both founders if the relationship breaks down. A typical vesting schedule is four years with a one-year cliff: if a founder leaves in year one, they keep nothing; after that, shares vest monthly. This is standard in the startup world and investors expect to see it.
EMI share options — the most tax-efficient way to reward early employees
Enterprise Management Incentive (EMI) options allow startups to grant share options to employees with significant tax advantages. Employees pay capital gains tax rates (typically 10% with Business Asset Disposal Relief) rather than income tax rates when they eventually sell a saving that can be tens of thousands of pounds per employee.
To qualify for EMI, the company must have gross assets below £30 million and fewer than 250 full-time equivalent employees. Most early-stage startups qualify comfortably. Setting up an EMI scheme requires HMRC notification and some legal documentation, but it is far simpler than most founders expect and is worth doing before you hire your first employee.
Step 3: SEIS and EIS — The Investor Relief That Changes Everything
If you are raising from angel investors, SEIS (Seed Enterprise Investment Scheme) and EIS (Enterprise Investment Scheme) are the most powerful tools available to you. They do not put money directly in your pocket — but they make investing in your company dramatically more attractive to investors, which means you can raise faster and at better terms.
SEIS — for very early stage raises
SEIS gives investors 50% income tax relief on investments up to £200,000 per company. An angel investing £100,000 into your SEIS-qualified startup gets £50,000 back from HMRC through their tax return. If the company fails, they get further loss relief on top. The effective downside risk for an investor is significantly reduced.
For founders, SEIS means you can pitch to angels who would otherwise want a lower valuation to compensate for the risk. With SEIS, the government is effectively subsidising 50% of their investment — which means your equity goes further.
EIS — for larger raises up to £5 million
EIS gives investors 30% income tax relief on investments up to £1 million per year (£2 million if investing in knowledge-intensive companies). The mechanics are similar to SEIS but the scale is larger and the eligibility criteria slightly different.
| SEIS | EIS | |
| Max investment per company | £250,000 lifetime | £12 million lifetime |
| Investor tax relief | 50% income tax relief | 30% income tax relief |
| Investor CGT exemption | Yes — after 3 years | Yes — after 3 years |
| Max company age | 3 years from first commercial sale | 7 years (10 for knowledge-intensive) |
| Max company size | Gross assets under £350,000 | Gross assets under £15 million |
| When to apply | Before the investment round closes | Before the investment round closes |
Advance assurance — get this before you start fundraising
You can apply to HMRC for SEIS or EIS advance assurance before you start talking to investors. This confirms that your company and proposed share issue will qualify for the relief. Without advance assurance, investors have to take your word for it — with it, they have HMRC confirmation. It is not legally binding, but it significantly speeds up investor due diligence and increases confidence.
The application involves submitting your business plan, company details and proposed share structure to HMRC. A specialist accountant handles this on your behalf and typically gets a response within 4–8 weeks. Apply early before your fundraising conversations get serious.
Step 4: R&D Tax Credits — Money Back for Building
If your startup is developing innovative software, AI systems, new technical processes or novel products, you may qualify for R&D tax credits a government incentive that allows companies to claim back a significant portion of their development costs.
This is one of the most widely unclaimed reliefs available to UK startups. Many vibe coding founders assume R&D credits are only for pharmaceutical companies or deep tech labs. In practice, a startup building an AI-powered product, training custom models, developing novel algorithms or creating software that solves a technical uncertainty can qualify — even if that software was partly built with AI tools.
How much can you claim?
Under the current SME R&D scheme, qualifying companies can claim an enhanced deduction on R&D expenditure. Loss-making startups — which most early-stage companies are can surrender the loss for a cash payment from HMRC. This means you can receive cash back even before your company is profitable.
Qualifying costs include: staff costs (salaries, NI, pension contributions), software and cloud computing costs used for R&D, consumables used in the R&D process, and subcontractor costs in some cases. The calculation is specific to your circumstances but a startup spending £100,000 on development could realistically receive £15,000–£25,000 back depending on their position.
What qualifies as R&D?
HMRC defines R&D as work that seeks to achieve an advance in science or technology through the resolution of scientific or technological uncertainty. For software startups this includes:
- Developing novel algorithms or AI models that are not simply reusing existing solutions
- Building systems that combine existing technologies in a way that is not straightforward
- Solving technical problems where the solution is not readily deducible by a competent professional in the field
- Creating new software architecture or infrastructure approaches
Using AI tools like Cursor or Claude to assist development does not automatically disqualify a claim the question is whether the underlying technical challenge is innovative. An accountant specialising in R&D claims can assess this quickly and advise on what is and is not claimable.
Step 5: The Funding Journey — What Happens When
| Stage | Typical raise | Key accounting tasks | Timeline |
| Pre-idea / side project | — | Incorporate, set up bank account, basic bookkeeping | Day 1 |
| Pre-seed / friends and family | £25k–£150k | SEIS advance assurance, cap table, founder vesting | Before first cheque |
| Seed (angels / syndicates) | £150k–£1.5m | SEIS/EIS compliance, R&D tax credits, management accounts | Ongoing |
| Series A | £2m–£10m | Audited accounts, EIS compliance, CFO support | 12–24 months post-seed |
Step 6: Finding the Right Accountant for an AI-Native Startup
Most accountants are set up for established businesses they handle VAT returns, year-end accounts and payroll. That is not what an early-stage startup needs. You need someone who:
- Understands SEIS and EIS advance assurance and has submitted multiple successful applications
- Has experience with R&D tax credit claims for software and AI companies specifically
- Can set up an EMI share option scheme correctly from the start
- Understands cap tables and can advise on share structure before investors arrive
- Works in Xero and can give you real-time visibility of your financial position
- Charges a predictable monthly fee rather than billing by the hour for every question
The wrong accountant at the early stage does not just cost you money it costs you time, and in the startup world time is the one thing you cannot get back. A missed R&D claim, a poorly structured SEIS application or a messy cap table discovered during due diligence can delay or kill a funding round.
eAccounts works with early-stage UK startups including AI-native and tech-first founders on company structure, SEIS and EIS advance assurance, R&D tax credit claims and the ongoing accounting that lets you focus on building. From £29/month with Xero included. Get a free quote in 2 minutes at e-accounts.co.uk/quote.
Frequently Asked Questions
Q: Do I need to incorporate before I start building?
No — you can build as an individual. But you should incorporate before you bring on a co-founder, issue any equity, take any investment or sign any commercial contracts on behalf of the business. Most founders incorporate earlier than they think they need to and are glad they did.
Q: Can I get SEIS if I have already started trading?
Yes — SEIS is available to companies within 3 years of their first commercial sale. If you have been selling for less than three years you may still qualify. Apply for advance assurance as soon as possible to confirm eligibility before your fundraising conversations start.
Q: Does using AI tools like Cursor or Claude disqualify my R&D claim?
No. Using AI tools to assist development does not automatically disqualify an R&D claim. The question is whether the underlying technical challenge you are solving involves genuine innovation and scientific or technological uncertainty. A specialist R&D accountant can assess your specific project quickly.
Q: What is the difference between SEIS and EIS?
SEIS is for very early stage companies raising up to £250,000, it gives investors 50% income tax relief. EIS is for companies raising larger amounts it gives investors 30% income tax relief. Most startups use SEIS for their first raise and then EIS for subsequent rounds once they have exceeded the SEIS lifetime limit.
Q: When should I set up EMI share options?
Before you make your first hire. EMI options are the most tax-efficient way to reward early employees and can be the difference between attracting a great early team member and losing them to a larger company. Setting them up after you have already hired someone is possible but more complicated.
Q: How much does an accountant cost for an early-stage startup?
eAccounts charges from £29/month for a startup package including Xero, a dedicated accountant and unlimited support. SEIS advance assurance applications and R&D tax credit claims are typically handled as separate engagements — get a free quote at e-accounts.co.uk/quote.
