Alex is Sprintlaw's co-founder and principal lawyer. Alex previously worked at a top-tier firm as a lawyer specialising in technology and media contracts, and founded a digital agency which he sold in 2015.
Contents
- What Is Legal Capacity?
- Legal Capacity vs Authority - Know the Difference
- Why Legal Capacity Matters for Businesses
- How To Ensure Legal Capacity and Authority Before You Sign
- How Legal Capacity Affects Modern (and Digital) Business
- Legal Capacity and Different Business Structures
- Common Mistakes and How To Avoid Them
- Supporting Documents That Strengthen Legal Authority
- Key Takeaways
- Need Help?
Running a business in Australia comes with a range of legal responsibilities - and one of the most important is understanding legal capacity. Whether you’re signing your first contract, expanding your company, or bringing on new partners, knowing who has the power to make binding agreements protects your business from costly mistakes.
In this guide, we explain what legal capacity really means, how it differs from authority, and how to make sure every deal your business enters is valid, enforceable, and compliant.
What Is Legal Capacity?
Legal capacity refers to a person’s or entity’s ability to enter into binding legal agreements and be held accountable for them. If you have legal capacity, you can sign contracts, take on obligations, and enforce your rights in court. If you don’t, a contract may be void or voidable, meaning it might not stand up legally. In business, this applies not just to individuals, but also to companies, partnerships, and trusts. Ensuring the right person has both capacity and authority is essential before any document is signed.Who Has Legal Capacity in Australia?
Adults
Anyone over 18 generally has full legal capacity, unless a mental condition or impairment prevents them from understanding the nature and effect of their actions.Minors (Under 18)
Minors generally have limited capacity to enter into contracts. However, certain agreements can still be valid - such as:- Contracts for necessities (e.g. accommodation, food, essential services)
- Beneficial contracts of service (e.g. employment or apprenticeships)
Individuals with Mental Impairment
If a person cannot understand the nature or consequences of a contract due to illness, injury, or cognitive impairment, the contract may not be enforceable. Capacity is decision-specific - someone might handle day-to-day agreements but not complex business transactions.Companies
A company has its own separate legal capacity (Corporations Act 2001 (Cth), s 124). It can enter contracts in its own name, but only through authorised individuals. Common methods include:- Execution by one or two directors, or a director and a company secretary, in accordance with s 127; or
- Execution by an authorised agent under s 126 (no company seal required).
Partnerships and Trusts
For partnerships, each partner generally has capacity to bind the business within the scope of partnership activities, though major decisions often require joint consent. For trusts, only the trustee (individual or company) has capacity, and it must act within the powers granted by the trust deed.Why Legal Capacity Matters for Businesses
Getting legal capacity wrong can have serious consequences:- Invalid or unenforceable contracts - the deal may not stand up in court.
- Personal liability - if you sign without authority, you may be personally responsible for losses or obligations.
- Commercial disputes - questions over who had the power to bind the business can delay or derail transactions.
- Reputational damage - errors in execution can shake stakeholder or investor confidence.
How To Ensure Legal Capacity and Authority Before You Sign
- Verify age and understanding - confirm any individual signatory is over 18 and capable of understanding the agreement.
- Check company details - use ASIC’s company register to confirm the company exists, is active, and who its directors are.
- Confirm signing authority - ensure the person signing has actual authority (director, company secretary, or authorised manager). Ask for documentation if unsure.
- Review board or partner approvals - for bigger decisions, check for a board resolution, shareholder approval, or partnership consent as required by governing documents.
- Document delegations - put internal delegations in writing (Delegation of Authority Policy or Power of Attorney).
- Keep records - store board minutes, resolutions, and signed contracts securely for proof of authority later.
How Legal Capacity Affects Modern (and Digital) Business
Many Australian businesses now sign documents electronically. The same capacity and authority rules apply - the medium doesn’t change the law. Under federal and state Electronic Transactions Acts, e-signatures are generally valid if:- The person intended to sign and be bound;
- Their identity can be verified; and
- The method of signing is reliable and appropriate in the circumstances.
Legal Capacity and Different Business Structures
| Structure | Who Has Capacity/Authority | Key Tip |
|---|---|---|
| Sole Trader | The individual (if over 18 and of sound mind) | Sign all contracts personally. |
| Partnership | Each partner (unless restricted by agreement) | Major decisions usually need joint approval. |
| Company | The company itself, through directors or authorised agents | Follow the Corporations Act and your constitution. |
| Trust | The trustee (individual or company) | Check the trust deed before signing anything. |
Common Mistakes and How To Avoid Them
- Letting junior staff sign contracts without written authority
- Not keeping delegation and resolution records up to date
- Failing to verify company details and directorships through ASIC
- Accidentally signing as an individual when representing a company
- Not confirming capacity when dealing with vulnerable or elderly individuals
Supporting Documents That Strengthen Legal Authority
- Shareholders Agreement - defines who approves major business decisions.
- Partnership Agreement - clarifies each partner’s authority and responsibilities.
- Delegation of Authority Policy - sets out who can sign contracts and up to what limit.
- Board Resolutions & Minutes - record major decisions and authorisations.
- Power of Attorney - grants legal authority for specific transactions.
- Employment Contracts - can outline signing rights for senior staff.
Key Takeaways
- Legal capacity means having the legal ability to enter binding agreements.
- Authority means having permission to act on behalf of a company or organisation.
- Always check that both capacity and authority exist before signing contracts.
- Governance documents and good records protect your business.
- Electronic signatures are valid if you verify identity and intention.
- Court approval for minors is rarely needed - but contracts with minors should be approached carefully.
- ASIC penalties are not typical for signing errors, but improper authority can still cause serious business risks.
