Comparison
Seisly does SEIS and EIS advance assurance for a flat fee. SeedLegals is a full fundraising platform that handles it as one module. Here is an honest comparison of price, scope and turnaround.
| Seisly ✦ | SeedLegals | Hiring a lawyer | |
|---|---|---|---|
| Headline price | £75 flat, one-time | £499 + VAT standalone, or included in a plan | ~£1,000–£2,500 |
| Pricing model | Single fixed fee | Standalone bolt-on, or bundled in an annual plan | Hourly or quoted |
| Subscription required | None | Not for standalone AA; plans from £649 + VAT/yr | None |
| Application drafted for you | Done-for-you | Guided build + expert review | Bespoke |
| AI-assisted drafting | Yes | AI review | Manual |
| Filing with HMRC | Optional add-on | Included | Included |
| Bespoke legal / tax advice | Not advice | Not advice | Yes |
| Wider fundraising tools | Advance assurance only | Cap table, rounds, options | None |
| Best suited to | The typical SEIS/EIS application | Founders wanting a full fundraising platform | Genuinely complex / edge-case structures |
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Prices verified against seisly.com and seedlegals.com/pricing, June 2026. Lawyer fees are a typical market range.
Seisly charges a flat £75 for the prepared application, with HMRC filing as an optional add-on. SeedLegals lists SEIS/EIS Advance Assurance at £499 + VAT as a standalone purchase, or includes one within an annual plan (Access from £649 + VAT/year). A solicitor or accountant typically charges between £1,000 and £2,500, usually billed hourly.
Seisly drafts your application from a short questionnaire, usually in under an hour. HMRC then typically takes 4 to 8 weeks to respond, whichever route you use. SeedLegals' team reviews your application over roughly one to two weeks before submission.
SeedLegals offers advance assurance free, but only inside a subscription: its plans run from £649/year (Access) to £1,199/year (Funding), plus VAT. If you want the whole fundraising platform, that can be good value. If you only need the application prepared and filed, a flat £75 once is far cheaper than any annual plan, with nothing else to buy.
It is an all-in-one fundraising platform – cap table, funding rounds, share issues and EMI or unapproved options, on one subscription, with continuity from round to compliance. If advance assurance is one part of a wider, ongoing need, that breadth is the point.
A flat £75 for the application alone, done for you, with optional HMRC filing and no subscription. A specialist focus on advance assurance, and a referral to a recognised firm through Seisly Advisers if your case needs one.
Genuinely complex or bespoke structures, or formal advice an investor requires.
It depends what you need. For the application alone, Seisly prepares and optionally files it for a flat £75 with no subscription. If you also want a full fundraising platform – cap table, rounds, EMI options – SeedLegals bundles that into an annual plan. For the application on its own, Seisly is the more direct, lower-cost route; for the whole raise on one platform, SeedLegals is built for that.
Seisly does one thing: prepare, and optionally file, your SEIS/EIS advance assurance application for a flat £75. SeedLegals is a broad fundraising platform that handles advance assurance as one module alongside cap tables, funding rounds and option schemes, priced through annual plans.
For advance assurance on its own, yes. Seisly is a flat £75. SeedLegals lists it at £499 + VAT standalone, or includes one within a plan from £649 + VAT a year. If you want the wider platform a plan can be worth it; if you only need the application, Seisly is the cheaper route.
For a straightforward application, yes – that is what Seisly is built for. For genuinely complex cases – a borderline excluded trade, a group or overseas structure, or an investor who requires sign-off from a recognised firm – a solicitor or tax adviser is the right call, and Seisly can refer you to one through Seisly Advisers.
Seisly drafts your application from a short questionnaire, usually in under an hour. HMRC then typically takes 4 to 8 weeks to respond, whichever route you use.
Choose SeedLegals if advance assurance is one part of a wider need – cap table, rounds, share issues or EMI options on one subscription. Hire a lawyer if your situation is genuinely complex or an investor requires formal professional advice. Choose Seisly if you mainly need the application prepared correctly and optionally filed, for a flat fee.
Figures verified against Seisly (seisly.com); SeedLegals pricing (seedlegals.com/pricing); HMRC advance assurance guidance (gov.uk), June 2026. Competitor prices and HMRC thresholds are taken from primary sources, not from either party's marketing about the other.
Check whether you qualify in about five minutes, free. If your case needs more than an application, your report will tell you.
From £75. No account, no email sign-up.