> ## Content Index > Fetch the complete content index at: https://entrepreneurplus.co.uk/llms.txt > Use this file to discover other available public pages before exploring further. # What Is a Convertible Loan Note and How Does It Differ From a SAFE? - URL: https://entrepreneurplus.co.uk/what-is-a-convertible-loan-note-and-how-does-it-differ-from-a-safe/ - Published: 2026-09-03T12:00:07.000Z - Updated: 2026-09-03T12:00:06.000Z - Description: What is a Convertible Loan Note, and how does it compare with a SAFE? Discover how interest, maturity dates, valuation caps and conversion discounts can shape your startup’s funding, dilution and future cap table. - Author: Sharoni Banerjee - Tags: Funding & Capital --- A convertible loan note (CLN) is debt a UK startup takes on now, intending to convert it into shares later usually at the company's next equity round rather than repaying it in cash. If you're asking **what is a convertible loan note** in plain terms, the answer is simple: it's debt with a built-in option to become equity, not equity from day one. Until conversion, it behaves like a loan interest accrues, a maturity date applies, and the company carries a real repayment obligation. This is the point most founders miss when they first hear investors mention the instrument: it's a genuine liability, not a lightweight IOU, and getting the terms wrong can create real dilution or cash-flow pressure later. For UK startups raising a pre-seed or seed round without a fixed valuation, **a convertible loan note is** one of the fastest routes to cash but it's meaningfully different from the SAFE structure many founders have heard about from US accelerators. --- ## How a convertible loan note works **A convertible loan note** works by giving an investor a loan today with a contractual right to convert it into shares once the company closes a future funding round, known as a "qualifying financing." At that point, the loan doesn't simply become shares at the going rate; it typically converts at a discount, and sometimes against a valuation cap, giving the investor a better price than new money coming into that round. The standard mechanics, per British Business Bank, are: an equity discount so the noteholder buys in cheaper than incoming investors; a maturity date, by which point the loan must either convert or be repaid; a valuation cap, setting the ceiling valuation used at conversion; and interest, payable on the loan itself. Most notes are unsecured at an early stage, though some are secured against company assets via a debenture. It represents a liability until conversion, though the precise accounting treatment depends on the specific terms and framework applied. --- ## Interest accrual on a convertible loan note The convertible loan note interest rate in the UK typically ranges from 2% to 8% per annum, according to the British Business Bank. Most early-stage notes roll interest up rather than paying it in cash; it accrues quietly and converts into extra shares alongside the principal at conversion, rather than being paid out along the way. That rolling-up mechanic matters more than it looks: every extra pound of accrued interest is another pound of dilution, and the longer the note sits unconverted, the bigger that claim grows. A founder negotiating a **convertible loan note interest rate** should think of it less as a borrowing cost and more as a slow-building stake in the company's future cap table and it's also the clearest legal marker separating a convertible loan note from a SAFE, which carries no interest obligation at all. --- ## Maturity dates and what happens if the note isn't converted A **convertible loan note's maturity** date is the deadline by which the loan must either convert into shares or be repaid. Miss that deadline without a qualifying funding round in place, and the investor can usually demand repayment or trigger an agreed fallback conversion. Maturity periods vary by agreement, so founders should check exactly what their own note specifies. A useful, if now historical, benchmark is the UK government's Future Fund scheme, which sets its convertible loan agreement at a 36-month maturity with 8% simple annual interest and a default 20% conversion discount. At maturity, principal was either repaid with a **100% redemption premium**, or converted with all accrued interest included, at the lender's choice. The scheme closed to new applications on 31 January 2021, but its structure still illustrates what a maturity date can force to happen. A SAFE, by contrast, has no maturity date at all, nothing forces conversion or repayment, which is why founders describe it as the more forgiving instrument. --- ## Conversion discounts and valuation caps A conversion discount gives the noteholder a lower share price than new investors get in the same round for example, a 20% discount on a £1.00 share price converts at 80p. According to Verve Ventures, market practice tends to sit somewhere between 10% and 30%, though it's a negotiated term rather than a fixed rule. A valuation cap sets the maximum company valuation used for conversion, so if the next round prices the business well above the cap, the noteholder still converts as though it were valued at the cap meaning proportionally more shares. Where a note carries both, the investor typically takes whichever produces the better price. | Mechanic | What it does | Typical range | | ------------- | -------------------------------------- | --------------------------------- | | Interest | Rolled into shares at conversion | 2–8% p.a. (British Business Bank) | | Discount | Cheaper share price than new investors | \~10–30% (market commentary) | | Valuation cap | Ceiling valuation for conversion | Case-by-case | | Maturity date | Deadline to convert or repay | Set by individual agreement | --- ## Long-stop dates explained A long-stop date is the backstop point at which conversion or repayment is forced if no qualifying funding round has happened effectively the outer deadline on the arrangement, often sitting alongside the maturity date itself. This matters most on the tax-advantaged side. If you're using an Advance Subscription Agreement (ASA) instead to preserve SEIS or EIS eligibility HMRC has generally expected the long-stop date to sit no more than six months from the agreement's date from December 2019\. That's a sharp contrast with a **standard convertible loan note**, and shows how differently the debt and non-debt routes are treated once HMRC gets involved. --- ## Convertible loan note vs SAFE: the key differences The **core convertible loan note vs SAFE** distinction is legal: a CLN is debt; a SAFE is not debt at all, just a contractual right to future shares. Everything else follows from that. A CLN accrues interest and carries a maturity date; a SAFE does neither. Documentation reflects it too: a note with side letters can run 15–20 pages, while a standard SAFE is a lean five. There's a UK-specific wrinkle worth flagging in any convertible loan note vs SAFE comparison: a standard **US-style SAFE isn't generally** suitable for a UK company without legal adaptation, since it references US concepts like "Common Stock" that don't map onto English company law. UK-adapted SAFE-style documents exist commercially, but there's no single HMRC-prescribed UK SAFE form equivalent to the widely used US YC SAFE. ![](https://storage.ghost.io/c/05/a4/05a4a052-18ab-4836-8924-ec8b322c371c/content/images/2026/09/loan-note-vs-SAFE.PNG.png) Boardroom valuation cap markers ## Which should UK founders use? The choice largely comes down to one question: does the round need to be **SEIS or EIS eligible**? A convertible loan note is generally not eligible for SEIS or EIS income tax relief, because the investment itself is debt rather than a qualifying share subscription. HMRC treats loan-to-share conversion as debt repayment, not new money raised for the company's trade. That rule carries real weight. SEIS offers investors 50% income tax relief on up to £200,000 invested per tax year; EIS provides 30% relief on qualifying investments up to £2 million annually, provided any amount above £1 million goes into knowledge-intensive companies. If SEIS/EIS eligibility matters to your investors, the UK-native alternative is an Advance Subscription Agreement, not a CLN or an imported SAFE. If your investors are debt-comfortable or aren't chasing that relief, a **convertible loan note remains** a fast, well-understood route to early-stage cash. --- ### FAQs **1\. Is a convertible loan note debt or equity?** It's debt, not equity, until it converts. It represents a liability on the company's accounts; the precise treatment depends on the agreement's terms and only becomes equity once the conversion trigger, usually a qualifying funding round, occurs. **2\. Does a convertible loan note accrue interest?** Yes, typically at 2–8% per annum, and it's usually rolled up rather than paid in cash building quietly and converting into extra shares alongside the principal, adding to dilution at conversion. **3\. What happens when a convertible loan note reaches maturity?** If no qualifying funding round has happened by then, the investor can typically demand repayment plus accrued interest, or trigger an agreed fallback conversion. The UK's Future Fund scheme is a good illustration: at its 36-month maturity, lenders could choose repayment with a 100% redemption premium, or conversion with accrued interest included. **Also read:** [*How Does Plum Make Money? Inside Its Layered Revenue Model*](https://entrepreneurplus.co.uk/how-does-plum-make-money-inside-its-layered-revenue-model/) --- **Sources:* British Business Bank guidance on convertible loan notes; HMRC's Venture Capital Schemes Manual and SEIS/EIS helpsheets (HS393); HMRC guidance on Advance Subscription Agreements via Osborne Clarke's reporting; Sifted's reporting on market-standard terms (Verve Ventures); UK government Future Fund scheme documentation.* ***The EP+ Editorial Desk covers UK startups, founder stories, and venture capital. All editorial content is independently produced and human-reviewed before publication.***