Person signing multiple advance subscription agreement documents on a dark wooden table, symbolising SEIS EIS investment paperwork

Advance Subscription Agreements and SEIS/EIS: HMRC Mistakes

Levi Strutton April 7, 2026

Common Mistakes that lead HMRC to Reject SEIS/EIS Treatment for your ASA

SEIS/EIS advance subscription agreements (ASAs) help early‑stage companies raise money quickly while still allowing investors to claim SEIS or EIS tax reliefs. Small drafting or implementation mistakes can still lead HMRC to refuse, reduce or later withdraw relief, creating problems for both companies and investors.

What is an Advance Subscription Agreement in the SEIS/EIS context?

An advance subscription agreement is a contract where an investor pays money to a company now in return for a right to receive shares later, usually on the next funding round or at a fixed longstop date.
In the EIS and SEIS context, HMRC generally only accept an ASA if it is a genuine advance subscription for shares and not, in substance, a loan or debt instrument.
HMRC’s guidance says they only accept an ASA as a qualifying advance subscription if it is non‑interest‑bearing, non‑refundable, non‑assignable and not capable of variation or cancellation in a way that undermines that character.
In practice, early‑stage companies use ASAs because they move more quickly than a fully priced funding round and can bridge to a larger raise.
Founders and board members often see ASAs as flexible and “standard”, but that can be dangerous if you use a template that does not reflect UK tax‑advantaged investment rules.
Many ASAs on the market are not suitable for an EIS/SEIS raise, and using the wrong form can cause serious problems.

How do SEIS and EIS treat ASAs and why does it matter?

Under SEIS and EIS, investors only obtain tax relief if they subscribe for eligible ordinary shares in a qualifying company, all statutory conditions are met, and the investment satisfies the risk‑to‑capital requirement.
An ASA can still work, but only if it forms part of a genuine equity investment with real commercial risk, rather than a disguised loan or a capital‑preservation structure.
HMRC describe the risk‑to‑capital condition as a high‑level gateway to the venture capital schemes and use it to filter out low‑risk or capital‑preservation arrangements.
This matters because investors will often sign an ASA on the basis that they expect to claim SEIS or EIS relief. If HMRC refuse relief because the structure does not meet the criteria, investors suffer a lower after‑tax return and may be less willing to support later rounds. A non‑qualifying ASA can also damage the company’s reputation and make future fundraising harder.

Common HMRC objections and mistakes that block SEIS/EIS relief

In practice, HMRC tend to raise concerns about SEIS EIS advance subscription agreements in a handful of recurring areas. If you understand these pressure points, you can structure agreements that are more likely to support relief.

Debt‑like or loan‑style terms in the ASA

HMRC frequently take issue with ASAs whose terms make the investment look more like a loan than equity.
This often happens where the document includes repayment rights, interest provisions or other protections that materially reduce the investor’s exposure to downside risk.
If HMRC believe the investor does not face normal equity risk, or can recover their money too easily, they are likely to refuse relief.
HMRC’s ASA guidance says that an ASA suitable for these schemes must not allow the company to refund the subscription, must not allow the parties to vary, cancel or assign it, and must not bear interest.
Many generic or US‑style convertible templates still include repayment on demand, interest accrual or a right for the investor to take repayment instead of shares.
These features may be common in other contexts, but they usually clash with the rules for tax‑advantaged equity and can make an ASA unsuitable for EIS/SEIS.

No genuine longstop date for issuing the shares

HMRC expect an ASA to lead to the actual issue of shares within a clear timeframe. As a general rule, they expect the longstop date to be no more than six months from the ASA date and warn that longer periods are unlikely to receive a favourable view at advance assurance.

An ASA with no longstop date, or one that allows the company to defer the issue indefinitely, gives HMRC a strong argument that the investor never made a certain subscription for shares.
From the company’s perspective, you may feel tempted to keep timing flexible, especially if you have not planned the next funding round.
For EIS/SEIS purposes, you need to be more precise.
If you state clearly when you will issue the shares, in what circumstances, and by what longstop date, you reduce the risk of HMRC challenge and reassure investors.
When you choose a longstop date, pick one that fits the company’s plans. Keep within HMRC’s general expectation of no more than six months where possible.

Linking conversion exclusively to a future funding round

Some ASAs say the company will only be issued shares if a future qualifying funding round takes place and give no alternative if that round never happens.
The problem is not the trigger itself but the lack of a fixed obligation to issue shares by a backstop date.
The more the ASA relies on future events and weak longstop, the easier it is for HMRC to argue that the subscription was not certain.
A better approach is to include both a future funding‑round trigger and a clear longstop date on which the investor will receive shares even if no round has occurred. This helps the ASA operate as a true advance subscription rather than an open‑ended contingent arrangement.

Inappropriate discount or valuation mechanics

ASAs often include a discount to the next round price or a valuation cap, which rewards early subscribers for taking more risk. Those features do not automatically disqualify the ASA. The key question is whether the pricing terms, taken with the other documents and any side deals, give the investor capital protection or make the ASA look more like debt.
If you draft the commercial terms so aggressively that they materially limit genuine downside risk, HMRC may decide that the arrangement fails the risk‑to‑capital condition. You also create problems if your valuation wording is unclear or open to more than one interpretation. Ambiguous language leads to uncertainty about how many shares you will ultimately issue and on what basis, which complicates the EIS/SEIS analysis and invites HMRC scrutiny. Draft the ASA so it explains clearly how you will calculate the price and number of shares, while still keeping a genuine equity‑style risk profile.

Side agreements or protections that undermine risk to capital

Even if the ASA itself looks acceptable, HMRC will also examine connected arrangements to see whether you have artificially reduced the investor’s risk. Side letters that promise buy‑backs at a fixed price, guaranteed dividends, minimum returns or early exit protections can all undermine the risk‑to‑capital condition. HMRC’s advance assurance materials ask for copies of subscription agreements and side agreements, which reflects their focus on the whole package, not only the main instrument.
Investors often seek extra comfort, especially if they are not familiar with early‑stage risk. The company and its advisers need to explain that some contractual protections may cost the investor their tax relief. If you do need extra arrangements, structure them carefully so HMRC cannot say that the investor’s capital is effectively protected.

Practical steps to structure an ASA so it supports SEIS/EIS eligibility

The good news is that many of these pitfalls can be avoided with careful upfront structuring of your SEIS EIS advance subscription agreement. The following steps are particularly important.

Start with an ASA drafted specifically for EIS/SEIS, not a generic convertible

Using an ASA that has been specifically designed with EIS/SEIS requirements in mind is one of the most effective ways to reduce the risk of HMRC objections. A properly drafted document will avoid loan‑like features, include an appropriate longstop, and reflect the fact that the arrangement must operate as a genuine advance subscription for eligible shares. Starting from that base, rather than retrofitting a generic convertible loan note or US‑style SAFE, materially reduces the chance of missing a critical technical point.

From there, the document should be adapted to reflect the specific circumstances of the company, the investor and the intended fundraising timetable. Boilerplate wording rarely fits perfectly, and a small amount of bespoke work at the outset can prevent much larger problems later.

Define clear triggers and a realistic longstop date

It is essential to set out clearly when the advance subscription will convert into shares. This usually involves an agreed event, such as the next equity funding round, together with a fixed calendar longstop date by which shares will be issued in any event. Both elements should be expressed in clear terms, avoiding over‑complex definitions that create uncertainty later.

When you choose a longstop date, pick one that realistically fits the company’s plans and, where possible, keep within HMRC’s general view that it should be no more than six months from the ASA date. A longer period may make advance assurance difficult and will need particularly careful analysis.

Avoid repayment rights, interest and guaranteed returns

If the ASA gives the investor a right to their money back instead of shares, or pays interest in the meantime, HMRC are likely to treat it as debt‑like.
To support EIS/SEIS eligibility, avoid repayment rights except in rare cases that need specialist analysis, and avoid interest or coupon‑style payments altogether.
HMRC’s manual says an ASA suitable for these schemes should not bear interest and should not permit refunds.
Investors need to understand that, to obtain the tax advantages, they must accept genuine risk and the possibility of losing some or all of their capital.

Make sure the shares to be issued are themselves eligible

Even if the ASA is drafted correctly, relief can still fail if the shares you issue do not meet the statutory tests.
For EIS and SEIS, the shares must be ordinary shares and must not carry prohibited preferential or redemption rights.
In practice, you should not review the ASA in isolation.
You also need to check the articles of association, any shareholder agreement and the rights attaching to the relevant share class.

Check investor and company eligibility early

Even a carefully drafted ASA will not secure relief if the company or investor fails the wider EIS/SEIS conditions. It is therefore important to review matters such as the company’s qualifying trade, gross assets, age limits, employee numbers, use of funds and the investor’s connection with the company. Those issues should be considered as early as possible, ideally before the ASA is signed, so that any problems can be identified and managed.

Often, the company will already have obtained, or be in the process of seeking, advance assurance. That can be useful, but it should be described accurately, HMRC treat advance assurance as a non‑statutory, discretionary opinion, not as a binding clearance, and it depends on full and accurate disclosure of the relevant facts and documents.

Timing, implementation and HMRC interaction

Once the ASA is in place, the way it is implemented in practice can be just as important as the drafting.

Issuing the shares and recording the investment correctly

Once the trigger event or longstop date occurs, the company must properly allot and issue the shares to the investor and complete all necessary corporate and Companies House formalities. Failure to complete those steps correctly and promptly can create doubt about when, or even whether, the subscription took place. HMRC’s ASA guidance also makes clear that the relevant tax relief is available only from the date the shares are issued, not from the date the ASA is signed or funded.

Accurate records are equally important. The board minutes, shareholder resolutions, updated cap table and statutory registers should all clearly reflect the issue of shares under the ASA. When the time comes to complete the SEIS/EIS compliance statement or respond to HMRC queries, a clear and consistent documentary trail makes the position much easier to defend.

Understanding HMRC’s risk‑based approach and likely questions

HMRC increasingly take a risk‑based approach to venture capital reliefs, focusing on structures that push the boundaries of the rules or that include capital‑preservation features. Companies should expect HMRC to ask for copies of ASAs and related documents, to question unusual features, and to probe the commercial rationale for the investment.

Typical questions include why you used an ASA instead of issuing shares immediately and how you chose the longstop date. They may also ask what other funding the company has raised and whether you have any side agreements with investors. Finally, HMRC often want to know how you will use the investment to grow and develop the business. Having clear, commercially grounded answers to those questions puts the company in a much stronger position if HMRC review the arrangements in detail.

For a broader overview of SEIS/EIS‑backed early‑stage rounds, you can also watch our webinar on successfully raising early stage investment.

Consequences if your ASA fails the EIS/SEIS tests

If an ASA does not support SEIS/EIS relief, you face three main types of consequence.

Loss of investor tax relief and potential claims

If HMRC conclude that an ASA does not support relief, investors may not receive the tax advantages they expected. That increases their effective cost of investment, especially where they relied on income tax relief and loss relief to manage risk. Some investors may then try to renegotiate their position, reduce future support, or allege that you misled them about the availability of relief.

For founder‑led and owner‑managed businesses, this can be especially damaging. Early investors are often friends, family, key contacts or cornerstone angels whose goodwill is critical to the company’s progress. A breakdown in trust at this stage can be very hard to repair.

Withdrawal of relief already claimed

The risk does not stop at future relief. If HMRC later decide that the structure or related arrangements breach the rules, they can withdraw relief that investors have already claimed. This often happens when a later review reveals undisclosed side arrangements, shows that the shares issued do not match those described in the application, or uncovers that the company operated the ASA in a way that differs from the documents given to HMRC.

Because HMRC treat advance assurance as non‑binding and dependent on full disclosure, companies should not overstate the protection it offers. The tax liability will usually fall on the investor rather than the company, but the reputational damage can still be significant. HMRC may also scrutinise your future EIS/SEIS applications more closely.

Knock‑on effects for future funding rounds and exits

EIS/SEIS issues can also influence how later‑stage investors and acquirers view the company. Their due diligence will usually cover historic funding rounds, tax relief claims and investment documentation. If they find problems, they may demand warranties, indemnities or price adjustments to cover the perceived risk.

For boards and senior management, getting an ASA right is therefore not just a technical tax point. It forms part of building a clean, investable corporate history that will stand up to scrutiny on future funding rounds and exits.

How The Jonathan Lea Network can help

Reviewing or drafting ASAs designed to support EIS/SEIS eligibility

We regularly advise founder‑led and owner‑managed businesses, as well as growing VC and angel‑backed companies, on the design and implementation of ASAs intended to support EIS/SEIS relief. Our work includes reviewing existing templates, identifying clauses that may concern HMRC, and drafting documents that reflect the commercial deal while staying within the scheme rules. We aim to protect investors as far as the law allows, without drifting into loan‑like territory that could jeopardise relief.

If you are considering your first ASA, we can supply a tailored template that fits your fundraising plans, cap table and wider growth strategy. Where appropriate, we also work with tax advisers to ensure that legal drafting and tax analysis align.

Supporting advance assurance applications and HMRC engagement

Alongside drafting ASAs, we help clients prepare and submit advance assurance applications and respond to HMRC questions about their funding structures. We explain the commercial rationale for using an ASA, set out how and when you will issue shares, and check that all supporting documents are complete and consistent. Where HMRC raise concerns or ask for changes, we help you find practical solutions that protect both tax relief and commercial objectives where possible.

If HMRC have already queried an ASA or refused relief, we can review the position, assess the strength of HMRC’s arguments, and advise you on possible next steps.

Integrating ASA and EIS/SEIS advice into your wider growth strategy

For ambitious SMEs and scale‑ups, EIS and SEIS rarely operate as one‑off events. They sit alongside other funding routes, shareholder arrangements, option schemes and exit plans. We help you think about ASAs and venture capital reliefs in that wider context so that early‑stage documentation does not create obstacles later. This can include reviewing your articles of association, shareholder agreements and historic investment documents to check for consistency and risk.

If you plan a new EIS/SEIS‑backed raise, it is usually best to take advice before you sign documents or receive funds. The same applies if you want to use ASAs for the first time or worry that your existing agreements may not be fit for purpose. Early structuring can save time, cost and stress, and it helps you maintain investor confidence as the business grows.

If you share your existing ASA and cap table with us at an early stage, we can usually give an initial view on risk areas and practical options within a short timescale. That allows you to move ahead with your fundraising on a clearer and more confident basis.

Contact Us For Advice

We usually offer a no-cost, no-obligation 20-minute introductory call as a starting point or, in some cases, if you would just like some initial advice and guidance, we will instead offer a one-hour fixed fee appointment (charged from £250 plus VAT, depending on the complexity of the issues and seniority of the fee earner).

Please email wewillhelp@jonathanlea.net or call us on 01444 708640 as a first step. Following an initial discussion, we can provide a clear scope of work, a fee estimate (or fixed fee where appropriate), and confirm any information or documentation we would need to review.

FAQs on SEIS/EIS‑eligible advance subscription agreements

Can I amend an SEIS/EIS advance subscription agreement after it has been signed?: No, not if you want it to qualify as an SEIS/EIS‑compatible ASA. HMRC’s guidance is explicit that an ASA they regard as suitable for SEIS/EIS must not be capable of being varied, cancelled or assigned. If the agreement allows the parties to amend or terminate it, or if you in fact renegotiate key terms, HMRC are likely to treat it as failing their ASA conditions and may regard it as, in substance, something closer to a loan. In practice, that means you should only put an ASA in place once you are confident it is drafted correctly, because you cannot rely on later amendments to “fix” SEIS/EIS problems.
What happens if I accidentally issue shares too early or too late under the ASA?: For SEIS/EIS, tax relief is tested by reference to the point when the shares are actually issued, not when the ASA was signed or funded. If you issue shares earlier than intended (for example, before a planned funding round or before a condition in the ASA has been met), you may find that the issue does not match what you showed to HMRC in your advance assurance or that other statutory conditions are not yet satisfied (although this may be acceptable). Issuing too late, especially after the longstop date or after the company has ceased to meet eligibility criteria, can also jeopardise relief. In either case, accurate board minutes, clear explanations in the compliance statement and, where necessary, early engagement with HMRC are important to manage the risk.
Can different investors under one ASA have varying conversion terms or longstop dates?: SEIS and EIS do not require all investors to have identical contractual terms, but material differences between investors can prompt HMRC to ask why some parties appear to have greater protection or a different risk profile. For example, if one investor has a shorter longstop date, a more generous discount or de‑facto repayment rights through a side arrangement, HMRC may question whether all subscriptions are genuinely at risk on the same commercial basis. If you need to use different terms, it is usually helpful to document the commercial reasons, keep any loan‑like protections out of SEIS/EIS‑intended instruments, and ensure the underlying share rights still satisfy the ordinary‑share requirements.
Can investors participate through a nominee or SEIS/EIS fund structure when using an ASA?: Yes, investors can often invest through a nominee or SEIS/EIS fund and still claim relief, provided the structure follows the statutory nominee rules. HMRC recognise that shares may be subscribed for and held by a nominee on behalf of underlying individuals, and the legislation treats those shares as if they were subscribed for and held by the beneficial investors themselves. However, the ASA must still satisfy the normal SEIS/EIS conditions, and arrangements where investors come in through a partnership or other vehicle that does not give them direct beneficial ownership will not qualify.
What happens if our ASA originally referred to preference shares but we later decide to issue ordinary shares instead?: For SEIS and EIS, qualifying shares must be new, fully‑paid ordinary shares that do not carry prohibited preferential or redemption rights. If your ASA is drafted on the basis that the investor will receive preference shares with priority rights on dividends or on a winding‑up, those shares will normally not satisfy the SEIS/EIS share requirements, and you cannot simply amend the ASA later because HMRC expect a qualifying ASA not to be capable of variation. Re‑labelling a preference class as “ordinary” in the documents does not help if, in substance, the rights remain preferential. In practice, if you want investors to benefit from SEIS/EIS but your existing ASA and capital structure point to non‑qualifying preference shares, you will usually need to take advice on putting in place a new, compliant equity subscription or revised fundraising structure that clearly issues eligible ordinary shares.
Does a low‑interest or zero‑interest convertible loan note count as an ASA for SEIS/EIS purposes?: No. HMRC draw a clear distinction between genuine advance subscriptions and loans, even if the loan is intended to convert into shares. A convertible loan note that can be repaid, carries interest (even at a low rate), or operates as debt until conversion will fall outside the SEIS/EIS rules, because the legislation does not permit relief for shares issued on conversion of a loan. Calling a document an “ASA” will not help if its legal and commercial terms are those of a loan. If investors want SEIS/EIS relief, they generally need a true advance subscription agreement that meets HMRC’s conditions, not a loan instrument with conversion features.
If the company changes its business model or qualifying trade between signing the ASA and issuing the shares, can investors still claim relief?: A change of business model or trade in this period can create real risk. SEIS and EIS both require that the company carries on a qualifying trade and meets conditions around excluded activities, age and use of funds at the time of the share issue and for a continuing period afterwards. If, before the shares are issued, the company moves into an excluded activity, breaches gross assets or age limits, or otherwise ceases to be eligible, HMRC may refuse or withdraw relief. Boards should therefore monitor planned pivots and new lines of business carefully during the life of an ASA and, where necessary, take advice or seek updated advance assurance explaining the revised trading plans.

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This article is intended for general information only, applies to the law at the time of publication, is not specific to the facts of your case and is not intended to be a replacement for legal advice. It is recommended that specific professional advice is sought before relying on any of the information given. © Jonathan Lea Limited.