The NEXUS Guide to Securing SEIS and EIS Advanced Assurance

Why It’s a Fundraising Superpower for UK Startups

If you’re building a UK startup and planning to raise angel investment, there’s one thing you cannot afford to ignore:

SEIS and EIS.

Done right, these schemes don’t just help your round.

They can transform your ability to close it.

And at the centre of that advantage sits one powerful tool that is important to start considering early on in your business journey: Advanced Assurance from HMRC.

So to get this right, here is your deep-dive guide to what SEIS and EIS really are, why Advanced Assurance changes the game, how the smartest founders secure it, and the tangible impact it can have on your business trajectory.

*Please note that none of this should be considered legal or financial advice.

First, What Are SEIS and EIS?

The UK government has created two tax-efficient investment schemes to encourage early-stage investing:

SEIS (Seed Enterprise Investment Scheme) – for very early-stage startups

EIS (Enterprise Investment Scheme) – for scaling early-stage businesses

They exist to de-risk angel investing and increase capital flow into startups.

SEIS – The Early Rocket Fuel

Here are the facts...

Your business can raise up to £250,000 on this scheme
50 percent income tax relief goes back to investors
Capital gains tax exemption if you hold the shares for 3 years
Loss relief if the company fails

This is one of the most generous tax incentives globally for startup investors and makes the UK a great place to build a business.

EIS – The Growth Multiplier

Raise up to £5m per year
30 percent income tax relief back to investors
Capital gains tax exemption after 3 years
Capital gains deferral relief
Inheritance tax relief after 2 years

For investors, this makes backing early-stage companies dramatically less risky.

For founders, it massively expands your investor pool.

So What Is Advanced Assurance?

Advanced Assurance is a formal letter from HMRC stating that, based on the information you’ve provided about your business, your company is likely to qualify for SEIS and/or EIS.

It’s not legally binding. But in practice, it’s powerful.

Because most angels will not invest without it.

Advanced Assurance tells investors:

The structure is compliant
Their tax relief is likely protected
This founder has done things properly

It signals professionalism, preparedness and credibility.

Why Advanced Assurance Is a Strategic Advantage

Founders often underestimate how powerful this is.

Here’s what it really does:

Speeds up fundraising
Investors move faster when risk is reduced

Removes friction in due diligence
You’ve already cleared one of the biggest structural hurdles

Signals competence
It shows you understand UK fundraising mechanics

Unlocks warmer conversations
Many angels simply will not engage seriously without it

In practical terms, it can be the difference between a long drawn-out raise and a focused, momentum-driven round.

What HMRC Is Actually Looking For

HMRC is not assessing:

Whether you’re the next unicorn
Whether your product is brilliant
Whether your brand looks impressive

They are assessing whether you meet the rules.

Broadly, the scheme requires:

A genuine trading company
Less than £350k gross assets for SEIS
Fewer than 25 employees for SEIS
Under 7 years old for standard EIS
Carrying out a qualifying trade
No prohibited activities such as property development or financial services
Meeting the risk to capital condition

The key phrase here is risk to capital.

HMRC wants to see that investors are genuinely at risk of losing capital and that the business intends to grow and develop.

How the Best Founders Secure Advanced Assurance

Top founders do not treat this as admin.

They treat it as part of their fundraising strategy.

1. They Prepare Investor Interest First

HMRC expects evidence of genuine investor interest.

This can include:

Emails from angels
Heads of terms
Expressions of interest
Convertible note conversations

You do not need money in the bank yet. But you do need proof there is demand.

Do not submit cold. Line up interest first.

2. They Write a Clear, Commercial Narrative

Your business plan matters more than people think.

Not in length. In clarity.

You need to articulate:

What the company does
Why it exists
How it makes money
How it will grow
What the funding is for

HMRC is checking:

Is this a growth company
Is it genuinely high risk
Is capital being used for expansion

Avoid fluff. Avoid hype. Be commercially coherent.

3. They Structure the Round Properly

Common mistakes include:

Issuing shares before approval
Incorrect share classes
Side letters with investor protections that break eligibility
Too much downside protection

If investors are over-protected, HMRC may reject the application.

SEIS and EIS must involve genuine risk.

Keep structures clean and simple.

4. They Think in Phases

Sophisticated founders often:

Raise the first £250k under SEIS
Then move into EIS for the larger raise

This maximises investor incentives and broadens your pool.

You do not choose one forever. You sequence intelligently.

The Real Impact on a Startup

What does this actually change?

Higher close rates
Investors are more comfortable writing cheques

Larger cheques
Tax relief makes £20k feel like significantly less downside risk

Better angels
More experienced UK angels expect SEIS and EIS

Faster momentum
Momentum attracts momentum

Stronger signal for VCs
While VCs do not rely on SEIS and EIS, it shows structural maturity

Advanced Tactics Most Founders Miss

Use Advanced Assurance as a marketing tool
Mention it in your deck and outreach. It increases response rates.

Position it properly in investor conversations
Do not just say “we have SEIS.”
Explain how income tax relief and loss relief reduce downside exposure.

Time your submission strategically
Apply when you have meaningful investor conversations, not too early and not too late.

Keep documentation investor-ready
Have your cap table, articles, forecasts and use of funds clearly organised.

Treat this as early due diligence.

Common Pitfalls That Derail Applications

Vague growth plans
Overly guaranteed investor protections
Not demonstrating genuine risk to capital
Submitting without investor evidence
Confusion around previous fundraising
Non-qualifying activities hidden in the model

If in doubt, simplify.

Complex structures increase rejection risk.

Is It Worth It?

If you are a UK startup raising angel investment and you do not secure SEIS or EIS Advanced Assurance, you are:

Shrinking your investor pool
Increasing friction
Slowing down momentum
Leaving tax efficiency on the table

The scheme exists to help founders.

But it rewards those who prepare properly.

Final Thought

SEIS and EIS are not paperwork.

They are strategic infrastructure.

The best founders understand that fundraising is not just about vision and storytelling.

It is about reducing friction.
Reducing risk.
And signalling credibility.

Advanced Assurance does all three.

If you are building something meaningful in the UK startup ecosystem, this is one lever you want pulled early - and at NEXUS, we can provide ongoing support to help you on your journey!

Because when fundraising is hard, structural advantages matter.

And this one is significant.

Good luck securing your Advanced Assurance and raising the funding you need to turn your MVP into tomorrow's next big thing!