Fiduciary Duties: What UK Company Directors And Founders Must Know

If you’re running a company (or about to), you’re probably focused on growth: customers, cashflow, hiring, product, investors.

But there’s one legal concept that sits quietly behind almost every major decision you make as a director or founder: fiduciary duties.

In the UK, directors have specific duties they must follow. These duties aren’t just “best practice” - they’re legal obligations. And if you get them wrong, you can face serious consequences (which can include personal liability in some cases), even if your business is small and you genuinely meant well.

This guide breaks down what fiduciary duties in the UK look like in practice, why they matter for small businesses, and what you can do to protect your company (and yourself) from day one.

What Does “Fiduciary” Mean In The UK?

In simple terms, a fiduciary duty is a duty to act in someone else’s best interests.

When we talk about fiduciary duties in the UK in a company context, we’re usually talking about the relationship between:

• Company directors (including founder-directors), and
• The company itself (as a separate legal person).

This is an important point: a director’s primary duty is generally owed to the company, not directly to individual shareholders, employees, customers, or co-founders (although other legal duties may apply to those relationships).

These duties exist because directors have power over company money, assets, information and opportunities - and the law expects directors to use that power properly.

In the UK, directors’ core duties are set out in the Companies Act 2006. If you’re a director, these duties apply regardless of whether you’re:

• paid or unpaid
• a sole director or one of many
• a founder, an investor-appointed director, or brought in later
• running a micro-business or a scaling startup

If you’re not sure what your legal role is (especially in early-stage startups where titles can get blurry), it’s worth tightening your paperwork early - including your Company Constitution and the rules that sit around decision-making and ownership.

Who Owes Fiduciary Duties In A Small Business?

For most small businesses, the key people who owe fiduciary duties are:

• Directors of a limited company (including de facto directors who act like directors, even if not formally appointed)
• Shadow directors (people whose instructions directors routinely follow)

In day-to-day business life, fiduciary issues often come up when:

• a founder is wearing multiple hats (director, shareholder, employee, consultant)
• you’re bringing in a new director or investor
• you’re paying yourself (salary/dividends/expenses)
• you’re doing deals with friends, family, or related companies
• someone wants to exit or there’s conflict between co-founders

These are all moments where your legal duties can collide with personal interests - and that’s exactly where fiduciary duties become important.

If you have more than one shareholder (or you think you will soon), having a clear Shareholders Agreement can be one of the most practical ways to reduce disputes about how decisions should be made and what happens when someone wants out.

What Are A Director’s Key Fiduciary Duties Under UK Law?

The Companies Act 2006 sets out seven general duties. These are often described as “fiduciary duties” because they’re grounded in loyalty, trust and acting for proper purposes.

Here’s what they mean in plain English - and what they look like in real small business situations.

1) Duty To Act Within Powers

You must act in line with:

• the company’s constitution (usually its articles of association), and
• powers only for the purposes they’re meant for.

Example: If your articles require shareholder approval to issue new shares, you can’t just “do it quickly” because an investor is pressuring you. Even if the deal feels urgent, the process matters.

In practice, this is where good governance helps - including properly documenting decisions with meeting notes and resolutions. If you need help formalising how decisions are made, it may be worth putting proper Board Minutes processes in place early.

2) Duty To Promote The Success Of The Company

You must act in the way you consider, in good faith, would be most likely to promote the success of the company for the benefit of its members (shareholders) as a whole.

This sounds simple, but it’s often the duty directors misunderstand most.

It doesn’t mean “maximise profit at all costs”. It means you should consider factors like:

• long-term consequences of decisions
• employees’ interests
• relationships with suppliers and customers
• impact on the community and environment (where relevant)
• maintaining the company’s reputation for high standards

Example: A short-term cash grab (like misleading marketing) might boost revenue this month, but it could damage reputation and create legal risk later. A director should be considering that bigger picture.

3) Duty To Exercise Independent Judgment

You can take advice, listen to investors and consider your co-directors’ views - but you can’t simply hand over your decision-making role.

Example: If an investor pressures you to sign a contract that you believe is harmful to the company, “they told me to” is rarely a good defence if the decision ends up causing loss.

This is particularly relevant when you have an advisor-heavy business, or where one founder dominates decisions. The law expects directors to think for themselves.

4) Duty To Exercise Reasonable Care, Skill And Diligence

This duty is about competence and attention.

It’s judged partly by what would be expected of a reasonably diligent person carrying out the role, and partly by what would be expected of you personally (based on your actual knowledge and experience).

Example: If you’re the “finance founder”, you’ll likely be held to a higher standard on financial matters than someone who has never managed accounts before.

For small businesses, this duty often comes up when:

• tax and payroll are neglected
• you sign contracts without reading them
• you don’t keep basic records
• you ignore obvious red flags in a deal

You don’t need to be perfect - but you do need to be reasonably careful, and to get professional support where it’s sensible.

5) Duty To Avoid Conflicts Of Interest

This is one of the biggest fiduciary duty risk areas for founders in the UK.

You must avoid situations where you have (or could have) a direct or indirect interest that conflicts with the company’s interests.

Example: You run Company A and you also have a side business that could supply Company A. Even if your pricing is fair, it’s still a conflict situation that needs to be handled properly (typically through disclosure and approval procedures).

Conflicts are common in small businesses because founders often have:

• other projects
• family businesses
• friends who become suppliers
• multiple entities (e.g. an IP-holding company and an operating company)

The key isn’t “never have a conflict” - it’s to manage it transparently and lawfully.

6) Duty Not To Accept Benefits From Third Parties

You can’t accept a benefit from a third party that arises because you’re a director, or because you do (or don’t do) something as a director.

Example: A supplier offers you a personal kickback to choose them for a contract. Even if the supplier is good, accepting the kickback is a problem.

This also connects with your internal policies around gifts and hospitality, and any anti-bribery compliance you should be thinking about as your business grows.

7) Duty To Declare Interests In Proposed Transactions Or Arrangements

If you’re interested in a transaction the company is considering, you must declare the nature and extent of that interest to the other directors.

Example: Your company is about to sign a contract with a marketing agency - and your sibling owns that agency. That interest must be declared properly before the company proceeds.

This duty applies even where the transaction is “obviously fine”. The legal risk usually isn’t the deal itself - it’s failing to disclose and follow the right process.

Common Fiduciary Duty Risks For Founders And Director-Owners

In big companies, fiduciary duties are managed with layers of governance.

In small businesses, it’s often just you, a co-founder, and a fast-moving to-do list - which is exactly why mistakes happen.

Here are some common scenarios where founders can accidentally step into fiduciary trouble.

Paying Yourself Without A Clear Process

If you’re a director and shareholder, it can feel like “it’s my company, so I can take money out when I need it”.

But the company’s money isn’t the same as your personal money.

Depending on how you take funds (salary, dividends, expenses, director’s loan), you may need:

• proper approvals
• accurate records
• tax compliance
• board resolutions or shareholder resolutions

Getting this wrong can create disputes with co-founders and issues with accountants, investors, or insolvency practitioners later. This is a common area where it’s worth getting both legal and accounting advice for your specific setup.

Using Company Opportunities For Personal Gain

This can happen when a director:

• takes a deal personally instead of through the company
• sets up a competing entity to “do the same thing better”
• diverts a lead to a side project

Even if you think the company “couldn’t have done it anyway”, this is a high-risk area, because it often overlaps with conflicts of interest and misuse of company property.

Not Documenting Decisions (Especially When Things Are Going Well)

When business is calm, governance feels optional.

But if there’s ever a dispute, a shareholder fallout, or a claim that a director acted improperly, your paperwork matters.

It’s much easier to show you complied with your duties when you have:

• clear board decisions
• records of disclosures
• signed contracts
• a consistent approval process

Strong documentation isn’t just “admin” - it’s part of protecting the company and reducing personal risk as a director.

How To Comply With Fiduciary Duties In Practice (Without Slowing Your Business Down)

Fiduciary duties can sound abstract, but compliance is usually about a few practical habits and good legal foundations.

1) Get Your Governance Documents Right Early

At a minimum, you want your company’s internal rules to be clear - particularly around decision-making, issuing shares, appointing directors, and approvals.

That starts with your Company Constitution, and for many small businesses, it also includes a well-drafted Shareholders Agreement.

This doesn’t just reduce conflict - it also helps directors act “within powers” and make decisions in a structured, defensible way.

2) Treat Conflicts As A Process Issue, Not A Personal Accusation

Conflicts are normal. The risk comes from hiding them or assuming they don’t matter.

A good approach is:

• identify conflicts early
• disclose them in writing
• have the non-conflicted directors decide what to do (and record it)
• follow whatever your constitution requires for approvals

This is often where founders benefit from having a simple conflict policy and consistent meeting notes.

3) Make Sure Key Commercial Relationships Are In Writing

Directors are expected to act with reasonable care, skill and diligence. One practical way to do that is to reduce uncertainty in your commercial dealings.

For example, if you’re relying on a supplier, contractor, or service provider, a tailored contract helps clarify:

• scope and deliverables
• pricing and payment terms
• intellectual property ownership
• confidentiality
• termination rights

If you’re engaging consultants or freelancers, having a proper Consulting Agreement can also help prevent later disputes about work product and expectations - which, in turn, supports directors in showing they managed the business responsibly.

4) Be Careful When You’re Wearing Multiple Hats

Many founders are:

• directors
• employees
• shareholders
• sometimes also contractors via a personal service company

That’s not automatically a problem. But it does mean you should separate:

• what decisions you’re making as a director (company interest)
• what you’re negotiating for yourself (personal interest)

If you’re also employing staff, make sure roles and obligations are clear with a proper Employment Contract, and keep your internal rules consistent so you’re not making “informal” decisions that later look unfair or inconsistent.

5) Don’t Forget Data And Confidential Information

Fiduciary duties overlap with other legal obligations - especially around information.

Directors should treat company information as company property, and ensure the business handles personal data appropriately where it applies.

If your business collects customer or user data (even just via a website enquiry form), having a compliant Privacy Policy is part of running the business properly and reducing avoidable risk.

What Happens If A Director Breaches Fiduciary Duties In The UK?

If fiduciary duties are breached, the consequences can be serious - and they’re not limited to large companies.

Possible outcomes include (depending on the facts):

• Personal liability to repay money or restore property to the company
• Account of profits (handing over profits gained from the breach)
• Injunctions (court orders to stop certain actions)
• Director disqualification in serious cases (especially where misconduct overlaps with insolvency issues)
• Shareholder disputes that can drain time, energy, and legal fees

It’s also worth knowing that, in some situations, the company (often via shareholders) may bring action against a director. Sometimes these issues surface years later - for example, when:

• new investors conduct due diligence
• the company is sold
• a co-founder relationship breaks down
• the business faces insolvency

This is why good habits early matter so much. When you’re busy building, it’s easy to think governance is something you’ll fix later - but later is usually when it’s more expensive (and more stressful) to fix.

Key Takeaways

• In a company context, fiduciary duties in the UK usually refer to directors’ legal duties owed to the company, largely set out in the Companies Act 2006.
• These duties apply to small businesses too - including founder-directors, unpaid directors, and people acting as directors even if not formally appointed.
• Key duties include acting within powers, promoting the success of the company, exercising independent judgment, using reasonable care and skill, avoiding conflicts of interest, not accepting improper benefits, and declaring interests.
• Common founder risk areas include conflicts of interest, paying yourself without approvals, taking opportunities personally, and failing to document decisions.
• Strong legal foundations (like a Company Constitution, Shareholders Agreement, clear contracts, and good record-keeping) make fiduciary compliance much easier and reduce the risk of disputes later.
• If a director breaches fiduciary duties, consequences can include repayment, handing over profits, injunctions, and serious disputes that distract from running the business.

If you’d like help getting your governance and contracts set up properly (or you’re worried about a potential director conflict), you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.