Answer
How much does SEIS advance assurance cost?
HMRC charges nothing to consider an advance assurance application, so the only cost is whoever prepares it. Mida OS charges a fixed £449 for SEIS, EIS or both in a single application; accountants typically charge £500 to £1,500 and law firms £1,000 to £3,000 or more. Post-round compliance with us is £50 per investor.
Cost by route
| Route | Advance assurance | Post-round compliance |
|---|---|---|
| HMRC itself | £0 | £0 |
| Mida OS | £449 fixed, SEIS, EIS or both | £50 per investor |
| Accountant | £500-£1,500 | Often billed hourly |
| Law firm | £1,000-£3,000+ | Usually hourly |
| Self-serve platform | Subscription plus per-filing cost | Usually an extra module |
What the £449 includes
- Eligibility review before anything is filed, with an honest answer if something needs fixing
- Drafting the full application pack from your plan and numbers
- Submission to HMRC's venture capital reliefs team
- Handling HMRC's follow-up questions until a decision
- Cover for SEIS, EIS or both in one application
Costs people forget
Advance assurance is not the end of the spend. After the round closes someone has to file the SEIS1 or EIS1 compliance statement and issue an SEIS3 or EIS3 certificate to every investor, which is where hourly billing tends to surprise founders. Ours is £50 per investor. Share issue paperwork, updated articles and Companies House filings sit outside advance assurance entirely.
Primary sources
What Mida OS actually does
We are a boutique SEIS and EIS consultancy in the UK. We check your eligibility, draft and file the advance assurance application with HMRC, and answer HMRC's questions until the letter arrives. Fixed fee of £449 for SEIS, EIS or both, and every application we have filed has been approved. After your round closes we file the SEIS1 or EIS1 compliance statement and issue SEIS3 and EIS3 certificates at £50 per investor.