From £75. Drafted in under an hour. No subscriptions.
Get the HMRC confirmation investors expect: your full SEIS or EIS advance assurance application and a covering letter we draft for you, prepared for a flat fee, not a £2,000 advisory bill. Built on a decade of real applications since 2012.
Check your eligibility free in 5 minutes. No account, no email sign-up needed.
Takes 5 minutes. No email sign-up needed.
The basics
What it is, why investors expect it, and how to get it without a £2,000 advisory bill.
Advance assurance is a voluntary confirmation from HMRC that a proposed share issue is likely to qualify for tax relief under the Seed Enterprise Investment Scheme (SEIS) or Enterprise Investment Scheme (EIS). It is not a guarantee, but it gives investors confidence that they should receive the income tax and capital gains reliefs the schemes offer.
Most angel investors and funds expect to see advance assurance before they commit. It signals that your company, your shares, and your planned use of funds meet HMRC's qualifying conditions, removing a major source of risk from the deal and making your round far easier to close.
HMRC's current turnaround is typically 4 to 8 weeks from a complete, correctly-prepared submission. The biggest avoidable delay is an incomplete application or a covering letter that does not address HMRC's requirements, which is exactly what a properly drafted submission prevents.
For most straightforward cases, no. The application is a structured submission plus a covering letter. Seisly prepares your application and drafts your covering letter for a flat £75 and can file with HMRC as your appointed agent. For genuinely complex structures, we refer you to a vetted specialist adviser in our network.
Why trust us
Built by the founder of the first SEIS fund on the market in 2012. Someone who has sat on all sides of the table: as the fund deploying investment, as the adviser helping founders get investor ready, and as a founder raising himself. Someone who, across more than a decade of applications prepared, advised on, and taken over, has got every one of them approved by HMRC.
We have been in this world since 2012. We know what HMRC looks for, what trips founders up, and why most straightforward AA cases don't need a full advisory engagement. Seisly is built for those cases. For everything else, we can refer you to Seisly Advisers, our network of specialist firms.
How it works
We handle the complexity. You focus on building.
Answer a few questions about your company and we check you against all HMRC qualifying conditions for SEIS and EIS. Free, instant, and no account needed.
Takes 5 minutesHow much are you raising, from how many investors, and on what terms. We use this to complete your application correctly first time.
No jargon, plain English throughoutOur AI drafts your full advance assurance submission and the covering letter HMRC reads first, for you to review and approve, built from over a decade of real applications.
AI-powered, expert-trainedRead through your application, make any tweaks, and submit directly to HMRC's SEIS and EIS team. We track the status and alert you to any updates.
HMRC turnaround: 4 to 8 weeksWe track your application and notify you the moment HMRC issues their decision. Average response time is 4 to 8 weeks. Once approved, you are ready to raise.
We track it for youWhat is included
One flat fee covers the application. Fixed-price add-ons available, including Seisly submission to HMRC, 24-hour express review, or one hour with a lawyer or tax adviser who submits the application on your behalf. Whatever path you choose, you will save hundreds of pounds.
Know in 5 minutes whether you qualify, before you spend a penny.
We prepare your complete SEIS or EIS advance assurance application and draft the covering letter for you to review and approve, in the format HMRC expects.
We review your uploaded documents for completeness and consistency before submission. You see exactly what HMRC will see, with suggestions to strengthen your application.
Optional add-on for £125 + VAT: we submit your application as your appointed agent, manage HMRC's response, and handle one round of queries. Or connect you with a specialist adviser so your application goes from a recognised firm. HMRC and investors both view applications from recognised advisers favourably.
If you choose our submission service, we track your application status and notify you the moment HMRC responds. Average HMRC turnaround is 4 to 8 weeks.
If you choose our submission service and HMRC comes back with questions, we help you respond. One round of HMRC queries included.
The honest comparison
| Full advisory engagement | Online legal platforms | Seisly ✦ | |
|---|---|---|---|
| SEIS advance assurance | ~£2,000 + VAT | ~£500 + VAT + subscription | £75 |
| EIS advance assurance | ~£2,500 + VAT | ~£500 + VAT + subscription | £75 |
| SEIS and EIS together | ~£3,000 + VAT | ~£800 + VAT + subscription | £75 |
| No monthly subscription | ✗ | ✗ | ✓ |
| Instant eligibility check | ✗ | ✓ | ✓ |
| Complex cases handled | ✓ | ✗ | ✗ (referred to specialist advisers) |
| HMRC query support included | ✗ billed extra | ✗ | ✓ with filing add-on |
| Built by SEIS fund founders | ✗ | ✗ | ✓ |
Scroll across to compare all three options →
Full advisory engagements make sense when your situation is complex, you need ongoing tax or corporate advice, or you want someone in your corner for the whole raise. For those cases we refer founders to specialist advisers in our network.
Pricing
Pay once per application. No subscriptions, ever.
What happens next:
Standard review: 5 working days.
Need it faster? Add Express Review (+£100) for guaranteed review within 24–36 hours.
Non-UK companies: add £100 to the application fee.
Seisly prepares advance assurance applications for UK founders. We do not guarantee that any application will be approved by HMRC. Advance assurance is discretionary and HMRC's decision is final. See our Terms of use for full details.
FAQ
Seisly done. From £75.
Join the founders who got investor-ready faster, with no long engagements or monthly plans.
Takes 5 minutes. No credit card needed to check eligibility.