PIK Notes Explained: How PIK Interest Works And Key Legal Terms

If you’re raising money for your startup, you’ve probably noticed that “debt” financing can get complicated fast.

One term that comes up a lot in venture and growth funding is PIK notes. They can be a useful tool when you need capital but want to preserve cash in the early stages (or during a difficult trading period). But they also come with very real legal and commercial risks if the terms aren’t thought through properly.

In this guide, we’ll break down what PIK notes are, what PIK interest means in practice, how PIK interest is calculated, and the key legal terms UK founders should look out for before signing.

What Are PIK Notes (And Why Do Startups Use Them)?

PIK notes (short for “payment-in-kind notes”) are a form of loan note where the borrower doesn’t pay some or all of the interest in cash as it accrues. Instead, the interest is “paid” by:

• Adding it to the principal (so the outstanding loan amount grows over time); and/or
• Issuing additional notes or instruments in lieu of cash.

From a startup’s perspective, the appeal is straightforward: you can raise funds without the monthly cash drain that comes with typical interest payments.

PIK structures are often used when:

• Cash flow is tight (common in early-stage scaling);
• The business is reinvesting heavily in product, hires, or marketing;
• The lender wants a higher return in exchange for flexibility on cash payments; and
• The parties want a “bridge” instrument while working towards an equity round or refinance.

PIK notes sit within a wider funding toolkit. Depending on your goals, you might compare them to instruments like a Convertible Note or a SAFE Note, each of which has different risk and dilution implications.

Important: “PIK note” isn’t a single standard form in UK law. It’s a commercial label for a note that includes a PIK interest mechanism. That means the details of your wording matter a lot.

What Is PIK Interest And How Does PIK Interest Work?

What is PIK interest? PIK interest is interest that accrues on a debt instrument but is not paid in cash at the time it accrues. Instead, it is capitalised (added to the loan balance) or paid through additional instruments.

So, how does PIK interest work in practice?

1) Interest Accrues (Even If You Don’t Pay Cash)

PIK interest typically accrues on a schedule (daily, monthly, quarterly, annually). Even though you’re not paying cash, the interest is still a real liability of the company.

This is one of the biggest misunderstandings founders have: “PIK” does not mean “free interest” or “interest later if we feel like it.” It means the payment method is different.

2) The Principal Grows Over Time

Most PIK notes work by adding the accrued interest to the outstanding principal. That means next period’s interest may be calculated on a higher amount (which can compound quickly).

For example (simple illustration only):

• You borrow £500,000
• PIK interest rate is 12% per year
• No cash interest is paid monthly
• Instead, the interest is capitalised

At the end of year 1, your principal could become £560,000 (depending on compounding method and exact drafting). In year 2, interest may then accrue on £560,000 rather than £500,000.

3) Payment Usually Happens At Maturity, Exit, Or Conversion

PIK notes typically become payable on a specified trigger, such as:

• Maturity date (end of the note term)
• Change of control (sale of the company)
• Next funding round (refinance or conversion into equity)
• Event of default (serious contractual breaches)

This is why PIK notes can look founder-friendly early on, but heavy later: you’re effectively deferring cash pressure, not removing it.

PIK Notes Vs Convertible Notes: What’s The Practical Difference?

People sometimes talk about PIK notes and convertible notes as if they’re competing products, but they can overlap.

A PIK note describes how interest is paid (in-kind rather than cash).

A convertible note describes what happens to the debt (it can convert into equity on specified terms).

So you can have:

• A standard loan note with cash interest
• A loan note with PIK interest
• A convertible note with cash interest
• A convertible note with PIK interest (common in some venture deals)

From a legal and commercial perspective, the key question for your startup is usually: are we taking on a liability that must be repaid in cash, or are we likely to convert it into equity?

This is where a well-drafted Term Sheet can be incredibly helpful early on, because it forces both sides to agree the commercial fundamentals (like maturity, conversion triggers, and investor protections) before lawyers start negotiating detailed drafting.

Key Legal Terms In PIK Notes UK Founders Should Watch Closely

PIK notes are often negotiated quickly, especially if your startup needs runway. But small drafting choices can change the risk profile dramatically.

Here are the terms to pay close attention to before you sign.

Interest Rate, Compounding, And The “PIK Toggle”

The headline interest rate matters, but so does the mechanics:

• Is interest simple or compounded? (compounding can snowball)
• How often is it capitalised? (monthly vs annually can be very different)
• Is there a “PIK toggle”? (sometimes you can choose to pay cash interest or PIK it - often at a higher rate when you choose PIK)
• Is there default interest? (a higher rate if you breach terms)

If your note includes a PIK toggle, you’ll also want to understand who controls the toggle (you, the lender, or both), and whether any notice requirements apply.

Maturity Date And Repayment Waterfall

Most disputes around loan notes happen when repayment is due.

Key questions to clarify in the drafting include:

• When is maturity?
• Can it be extended? (and on what conditions?)
• Is repayment mandatory at maturity? or is there an automatic conversion mechanism?
• What happens if you don’t have the cash?

Even if you’re optimistic about raising your next round, it’s worth planning for a slower fundraising market. A maturity date that’s too soon can create leverage for the lender later on.

Conversion Terms (If Any): Valuation Cap, Discount, And Trigger Events

If the PIK note is also convertible, the conversion clause will usually be the commercial heart of the deal.

Common conversion terms include:

• Qualified financing (conversion happens when you raise above an agreed amount)
• Discount rate (the lender converts at a cheaper price than new investors)
• Valuation cap (a maximum valuation used for conversion calculations)
• Change of control (conversion or repayment on a sale)

These terms often interact with your shareholder arrangements, so it’s smart to check how they align with your Shareholders Agreement (for example, drag/tag rights, consent thresholds, and share class mechanics).

Security, Guarantees, And Priority (Subordination)

Many founders focus on interest and conversion, but security is where risk can become very real.

A lender may ask for:

• Security over company assets (fixed or floating charges)
• Personal guarantees from founders/directors (high risk - get advice)
• Priority rights over other creditors (or “seniority”)
• Negative pledges restricting future borrowing

Security and priority can affect your ability to raise further funding later, because new investors (or banks) may not want to come behind an existing secured lender.

Events Of Default (And What Happens Next)

PIK notes often include a list of “events of default”. Some are obvious, like failing to repay at maturity. Others can catch startups out, such as:

• Breach of information undertakings (not delivering accounts on time)
• Insolvency-related triggers (even early warning signs)
• Breach of other contracts (cross-default clauses)
• Change in business outside an agreed scope

Default provisions often give the lender rights to accelerate repayment, increase interest, enforce security, or step into greater control.

This is exactly why you don’t want to rely on generic templates. The goal is to make sure your defaults are fair, clear, and workable for an early-stage business.

Information Rights And Investor Controls

Lenders may request ongoing reporting rights and sometimes consent rights over major decisions. This can include:

• Monthly/quarterly management accounts
• Annual audited accounts
• Approval rights over new debt, major capex, or acquisitions
• Board observer rights

Controls like these can also interact with your internal governance documents, including your Founders Agreement, especially if the funding changes how founders make decisions day-to-day.

How Should A UK Startup Document PIK Notes Properly?

PIK notes are legally binding contracts. If the relationship goes sideways, you’ll be relying on what the documents say - not what you “understood” at the time.

Note: This guide is general information only and isn’t tax, accounting, or financial advice. PIK structures can have accounting and tax implications, so it’s worth checking your specific position with your accountant or tax adviser.

While every deal is different, documentation often includes:

• Term sheet (non-binding on most commercial points, but sets the roadmap)
• Loan note instrument (the detailed contract)
• Subscription letter or mechanics for issuance (if relevant)
• Security documents (if the note is secured)
• Board and shareholder approvals (depending on your constitution and shareholder arrangements)

It’s also worth thinking about execution formalities. Depending on the specific document and drafting, some funding documents are executed as deeds (for example, certain security documents or instruments intended to take effect as deeds). Even where a deed isn’t required, getting signing mechanics right helps avoid enforceability headaches later. If your deal involves deed execution, the signing blocks and witness requirements should be handled carefully (especially if investors are signing remotely). The practicalities matter, because a badly executed document can become a costly distraction at exactly the wrong time.

If you’re also dealing with existing director funding or informal loans that need tidying up before an investor comes in, you may need to properly document those arrangements too, for example via a Directors Loan Agreement.

And if your business is already carrying shareholder or director debt, it’s sensible to get clarity on repayment, priority, and what happens on exit - because new investors will almost always ask. (This often comes up in due diligence.)

Key Takeaways

• PIK notes are loan notes where interest is paid “in kind” (typically by capitalising it), rather than being paid in cash as it accrues.
• PIK interest can preserve cash flow early, but it increases the debt balance over time and can compound quickly depending on the drafting.
• PIK mechanics can appear in different instruments, including loans and convertible notes - so always check whether the note must be repaid in cash or is likely to convert into equity.
• Key legal terms to scrutinise include the interest rate and compounding method, maturity date, conversion triggers, security and guarantees, events of default, and investor control rights.
• Getting the documentation and signing formalities right matters, especially where the note is secured, convertible, or forms part of a wider fundraising round.
• Because there’s no single “standard” PIK note in the UK, it’s worth getting tailored legal advice so the terms match your commercial reality and growth plans.

If you’d like help reviewing or drafting PIK notes (or negotiating the terms so you’re protected from day one), you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.