When to Use a Letter of Assignment in Australian Business

If you run a growing business, you’ve probably had moments where you need to “move” a contract from one entity to another.

Maybe you’re restructuring (for asset protection or investment), selling your business, spinning up a new company for a product line, or simply tidying up legacy agreements signed back when you were a sole trader. In those situations, businesses often use a letter of assignment to help document the transfer.

A letter of assignment can be a practical, cost-effective way to record an assignment (the transfer) of rights under a contract. But it’s also one of those areas where a quick template can create bigger issues later if it doesn’t match what your underlying contract allows.

Below, we’ll walk you through what a letter of assignment is, when it works, when it doesn’t, and how to approach it from a small business and startup perspective in Australia.

What Is A Letter Of Assignment (And What Does “Assignment” Actually Mean)?

A letter of assignment is a written document that records the transfer of certain rights (and sometimes benefits) from one party to another.

In plain English, assignment usually means:

• one party (the assignor) transfers their rights under an existing contract to another party (the assignee); and
• the underlying contract itself continues to exist (it’s not replaced with a brand new contract).

This often comes up where your business wants to transfer things like:

• the right to receive payments (for example, invoices or royalties);
• the benefit of a customer agreement;
• the benefit of a supplier arrangement;
• intellectual property rights (depending on what’s being assigned and how it’s documented); or
• the benefit of a lease-related arrangement (though leases can be more complicated and often require landlord consent and formal documentation).

Importantly, assignment is not always “everything under the contract”. In many contracts, you can assign rights (benefits) but you can’t automatically shift obligations (burdens) without additional steps or consent.

Why Startups And Small Businesses Use Assignment So Often

Startups and small businesses tend to evolve quickly. You might start trading as a sole trader, then later incorporate a company, then later create a group structure or bring in investors.

It’s common to realise that:

• your customer contracts were signed in the founder’s personal name;
• your contractor agreements are with “OldCo” but your new entity is “NewCo”; or
• your IP was created informally, and your company now needs to own it for investment readiness.

Assignment documents (including a letter of assignment in suitable cases) can help create a clean paper trail so your legal position matches how you actually operate.

When Do You Need A Letter Of Assignment In Business?

There’s no single “one size fits all” moment, but there are a few common business scenarios where a letter of assignment becomes relevant.

1. You’re Restructuring Your Business (Sole Trader To Company, Or New Company Setup)

If you’re moving from a sole trader or partnership into a company, you might need to transfer key contracts into the company name.

This often includes:

• client agreements (so the company is the party paid and liable for services);
• supplier agreements (so invoices and obligations sit with the company); and
• software subscriptions and service provider agreements.

If you’re adopting a company structure and formalising your internal governance, you may also be putting documents like a Company Constitution in place at the same time, particularly if you’re preparing for growth or future investment.

2. You’re Selling Or Buying A Business (Or Doing Due Diligence)

In a business sale, the buyer typically wants to receive the benefit of:

• customer contracts;
• supplier arrangements;
• intellectual property rights; and
• other valuable “assets” of the business.

Depending on deal structure, those assets might be transferred by assignment. This is usually documented in a broader sale agreement, but there may also be standalone assignment documents (including letters of assignment) to complete the handover cleanly.

3. You’re Moving Contracts Between Entities In A Group

As you grow, you might create separate entities for different functions (for example, one entity employing staff, another entity owning IP, another entity operating the business).

Assignment can be one way to move contractual rights to the right entity - but you need to check what your original agreements say first, because many contain “no assignment” clauses.

4. You’re Transferring Intellectual Property Or Commercial Rights

If your business is transferring ownership of intellectual property (like copyright in code, written content, designs or branding), you may need an IP assignment (and in some cases, a deed rather than a simple letter).

In practice, many businesses also use agreements like an IP Assignment to clearly document what IP is being transferred, when, and on what terms.

Assignment vs Novation: Why The Difference Matters

One of the biggest traps we see is businesses using the word “assignment” when what they really need is novation.

Here’s the practical difference:

• Assignment generally transfers rights/benefits under a contract from one party to another, but does not automatically transfer the obligations.
• Novation replaces one of the contracting parties with a new party, so the new party takes on both the rights and the obligations (and the old party is usually released).

So if you’re asking, “How do I move this entire contract into my new company, so my old entity is no longer involved?”, you may be looking at novation rather than assignment.

A novation is usually documented in a more formal Deed of Novation, and it commonly requires all parties to agree (because everyone’s legal position is changing).

A Simple Example

Let’s say your startup signed a 12-month services contract with a major client in your founder’s personal name before you incorporated.

• If you assign the “right to be paid” to your company but the founder remains responsible for performance, you haven’t really solved the risk issue.
• If you novate the contract, the company can step in as the service provider, and the founder can usually step out entirely (subject to agreement and contract terms).

Getting this distinction right early can save you from messy disputes later - especially if the relationship breaks down or you’re trying to raise capital.

What Should A Letter Of Assignment Include?

A letter of assignment should be short and practical, but still legally clear. Exactly what you include depends on what you’re assigning and what the underlying contract requires.

In many cases, a well-drafted letter of assignment will cover:

1. The Parties

• Assignor: the current party holding the rights (for example, your old entity).
• Assignee: the party receiving the rights (for example, your new company).
• Counterparty (if required): the other party to the original contract (some assignments require their consent or at least notice).

2. The Contract Being Assigned

Be specific. You want to identify the underlying agreement clearly, usually including:

• the contract title (if it has one);
• the date of the contract;
• the parties to the contract; and
• any reference number or schedule, if relevant.

3. What Exactly Is Being Assigned

This is where businesses can accidentally create ambiguity.

Spell out whether you’re assigning:

• all rights and benefits under the contract; or
• only certain rights (for example, the right to receive payments from a particular date); or
• rights in relation to a specific project, customer cohort, territory or product line.

4. The Effective Date

When does the assignment take effect? This matters for:

• who issues invoices;
• who receives payments;
• who can enforce the contract; and
• how you reconcile revenue and tax reporting (your accountant can help you confirm the right approach for your structure and circumstances).

5. Consent Or Notice (If The Contract Requires It)

Many commercial agreements contain clauses that say a party must not assign without the other party’s written consent.

If consent is required and you don’t obtain it, you may be in breach of contract and the assignment may not be effective against the counterparty (even if everyone “informally agrees”).

If notice is required (rather than consent), your letter should show that notice has been given correctly.

6. Signatures And Execution Details

Make sure the letter is signed by the correct legal entity and the correct signatory.

For companies, you may need to consider proper execution methods (including director signing and internal approvals). If you’re signing on behalf of another person or entity, it’s worth understanding p.p. signatures and what they mean in practice.

7. Practical Attachments

It can be helpful to attach a copy of the original contract to avoid any doubt about what’s being assigned (especially when you’re dealing with older agreements or email-based contracts).

Common Legal Risks (And How To Avoid Them)

A letter of assignment is often treated as “simple admin”, but the risks can be significant if the transfer is done incorrectly.

1. The Contract Prohibits Assignment

Some contracts fully prohibit assignment. Others allow assignment only with written consent. Some allow assignment within a corporate group, but not to third parties.

If you don’t follow the contract’s rules, you may end up with:

• a breach of contract claim;
• termination rights being triggered; or
• a situation where the assignee cannot enforce the contract against the counterparty (or the counterparty refuses to recognise the transfer).

Before you sign anything, review the relevant “assignment”, “change of control”, or “variation” clauses.

2. Trying To Assign Obligations (When You Can Only Assign Benefits)

In many cases, you can assign the benefit of a contract but you can’t automatically transfer the obligation to perform.

If your goal is to shift both rights and obligations, you may need novation or a fresh agreement. This is especially important where:

• the contract involves ongoing service delivery;
• there are warranties, indemnities, or liability caps tied to the original party; or
• the counterparty chose you specifically (for your skills, reputation, licences, or insurance).

3. Creating Confusion For Customers Or Suppliers

Even if the legal paperwork is correct, assignment can confuse the “real world” relationship.

For example:

• your customer keeps paying the old entity;
• your supplier keeps issuing invoices to the wrong name; or
• someone disputes the assignment and refuses to deal with the new entity.

Practical steps like issuing clear notices and updating your customer-facing documents can reduce friction. If you operate online, it’s also worth checking that your Website Terms and Conditions and other “legal footer” documents reflect the correct contracting entity.

4. Privacy And Data Transfers Get Missed

If you’re assigning a contract that involves customer data, you also need to think about privacy.

In many cases, your ability to transfer personal information will depend on what you told customers in your Privacy Policy (and what consents you collected). This is particularly relevant in acquisitions, restructures, and group reorganisations.

5. IP Ownership Still Isn’t Clean

Businesses often assume that if a contractor created something for them, the business automatically owns it. That’s not always true.

If you’re assigning IP or relying on IP ownership as part of an assignment, you may also need to ensure your creator relationships are covered properly (for example, contractor agreements with correct IP clauses, or a standalone IP assignment).

What Other Documents Should You Consider Alongside A Letter Of Assignment?

A letter of assignment is rarely the only “moving parts” document in a restructure, sale, or scale-up.

Depending on what you’re doing, you might also need:

• Deed of Novation: if you need to replace a party to a contract (not just assign benefits).
• Deed of Variation: if you want to change key terms at the same time as transferring rights (for example, updating pricing, scope, or parties).
• New customer or supplier contracts: sometimes it’s cleaner to issue updated agreements rather than relying on assignment.
• Employment documentation: if your restructure changes the employing entity, you may need fresh or updated Employment Contract arrangements and correct onboarding.
• Shareholder and governance documents: if you’re bringing on co-founders or investors while restructuring, documents like a Shareholders Agreement can become essential for decision-making and ownership clarity.

The “right” pathway usually depends on what your underlying contracts say, how important the relationship is, and what risks you’re trying to manage (liability, payment rights, investment readiness, or a clean sale).

Key Takeaways

• A letter of assignment documents the transfer of rights (and typically benefits) under a contract from one party to another.
• Assignment is not the same as novation - if you need to transfer both rights and obligations (and replace a contracting party), a deed of novation is often the better fit.
• Always check the underlying contract for “no assignment” clauses, consent requirements, and notice rules before you rely on a letter of assignment.
• A clear letter of assignment should identify the contract, specify what’s being assigned, include an effective date, and be properly executed by the correct parties.
• Don’t forget the operational flow-on effects (invoicing, customer comms, data transfers, and IP ownership) - legal paperwork only works if your business processes match it.

If you’d like a consultation on a letter of assignment (or whether you need an assignment, novation or a different document), you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.