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.
- Do I Need A Lawyer To Buy Into A Business?
- What Is A Business Partner Buy In Agreement?
- What Due Diligence Should I Do Before Paying?
- How Should Valuation, Equity And Payment Work?
- Should My Equity Vest Over Time?
- What Restraints And Exit Terms Should Be Included?
- Business Partner Buy In Agreement Template: What To Include
- Key Takeaways
Buying into a business can feel exciting and slightly nerve-racking at the same time. You might be joining a business you already know well, backing a friend, or becoming a co-owner after years of working in the industry.
Before money changes hands, it's worth slowing down and getting the deal in writing. A handshake can feel friendly at the start, but it won't answer the harder questions later, like what happens if someone wants out, stops working in the business, or disagrees about dividends.
A well-drafted business partner buy in agreement helps everyone understand the price, the equity, the rules for working together and the exit plan from day one.
Do I Need A Lawyer To Buy Into A Business?
Yes, in most cases you should get a lawyer involved before you buy into a business, because you aren't just buying an asset - you're stepping into an ownership relationship.
That relationship might be set up as a company, partnership, trust or unit trust. The legal structure changes what you're buying, what documents you need and what risks you're taking on.
For example, buying shares in a company is different from becoming a partner in a partnership. A shareholder buy in agreement usually needs to work alongside the company constitution and shareholders agreement. A partnership buy in contract usually needs to fit with the relevant state or territory Partnership Act and any existing partnership agreement.
Your lawyer can help you check:
- What you're actually buying - shares, units, partnership interest, business assets or a mix.
- Who is selling it - the company, an existing owner, a trust or another entity.
- What approvals are needed - for example, director approval, shareholder approval or consent under an existing agreement.
- What records need updating - such as the company register, ASIC records where required, ABN details or business name ownership.
- What happens if the deal doesn't complete - including refunds, deposits and conditions.
If you're searching for a business partner buy in agreement in Brisbane, Melbourne, Sydney or anywhere else in Australia, the core legal issues are similar. Some details are state-based, especially for partnerships, leases and duties, so local context still matters.
Templates can be a helpful starting point, but they often miss the commercial deal. The best agreement is tailored to your business, the people involved and the way money will actually flow.
What Is A Business Partner Buy In Agreement?
A business partner buy in agreement is the document that records how you become an owner and what rights and obligations come with that ownership.
It may be called different things depending on the structure. You might need one or more of the following:
- Share sale agreement - if you're buying existing shares from a current shareholder.
- Share subscription agreement - if the company is issuing new shares to you.
- Shareholders agreement - to set out voting, dividends, director roles, exits and dispute processes.
- Partnership buy in contract - if you're joining a partnership rather than a company.
- Unitholders agreement - if the business is run through a unit trust.
- Founders or vesting agreement - if your ownership depends on staying involved over time.
The agreement should do more than say how much you pay. It should explain what you receive in return, when you receive it and what happens if something changes.
For example, if you pay $80,000 for 20% of a cafe business, the agreement should say whether that 20% gives you voting rights, dividend rights, a say over hiring decisions, access to financial records, and a seat at management meetings.
It should also say whether your $80,000 goes to the existing owner personally, into the company as growth capital, or partly to each. That matters because it affects the business cash position and the commercial fairness of the deal.
A good buy in agreement usually sits beside the business' core governance documents, not instead of them. If the business has a company constitution or existing shareholders agreement, those documents should be reviewed so they don't conflict with your new deal.
What Due Diligence Should I Do Before Paying?
You should do due diligence before you pay the buy in amount, because the agreement is only as good as the business you're buying into.
Due diligence is the process of checking the business' legal, financial and operational position. It helps you confirm the valuation, spot liabilities and decide whether the deal terms need to change.
Start with the basics:
- Entity checks - confirm the ACN, ABN, business name ownership, directors, shareholders and registered office details.
- Financial records - review profit and loss statements, balance sheets, BAS records, debts, shareholder loans and major expenses with your accountant.
- Customer and supplier contracts - check whether key contracts can continue after you buy in and whether any consent is needed.
- Employment records - review employee contracts, awards, leave balances, superannuation records and Fair Work Act 2009 compliance.
- Lease documents - check rent, term, options to renew, permitted use, personal guarantees and landlord consent requirements.
- Intellectual property - confirm who owns the trade marks, domain names, copyright, software, designs and social media accounts.
- Privacy and data - check whether the business must comply with the Privacy Act 1988, especially if turnover is over $3 million or an exception applies.
- Consumer law risk - review refund policies, warranties, advertising claims and Australian Consumer Law compliance.
Say you're buying into a gym in Brisbane. The financials look strong, but due diligence shows the lease only has 14 months left and there's no option to renew. That might not kill the deal, but it changes the risk. You may want landlord consent, a renewed lease, or a lower valuation before you commit.
You don't need to investigate forever. You just need a clear checklist, access to the right documents and conditions in the agreement that let you walk away or renegotiate if serious issues appear.
How Should Valuation, Equity And Payment Work?
The valuation should be agreed clearly before you sign, because small changes in assumptions can make a big difference to how much equity you receive.
There's no single correct valuation method for every small business. Common approaches include:
- Asset value - useful where equipment, stock or property are the main value drivers.
- Earnings multiple - often based on profit or EBITDA, adjusted for owner wages and unusual expenses.
- Revenue multiple - sometimes used for higher growth businesses, but it can be risky if profit is low.
- Agreed strategic value - where your skills, client base or industry access are part of the deal.
Here is a simple example. Mia runs a cleaning business through a company. The business is valued at $400,000 after reviewing its contracts, equipment, profit and client concentration. Tom agrees to buy in for $100,000.
If Tom's $100,000 goes to Mia personally for some of her existing shares, the company still has the same cash balance after completion. Tom owns 25% and Mia owns 75%.
If Tom's $100,000 goes into the company for newly issued shares, the post-money value may be treated as $500,000. Tom may receive 20%, and the company keeps the $100,000 to hire staff and buy equipment. Both outcomes can be fair, but they're very different.
Your agreement should spell out:
- The valuation basis - including what financial information was relied on.
- The percentage ownership - and whether it's fully paid, partly paid or subject to vesting.
- Payment timing - deposit, completion payment, instalments or earn-in arrangements.
- Conditions - such as due diligence, finance approval, landlord consent or key customer consent.
- Adjustments - for debts, stock, unpaid invoices or working capital at completion.
You should also speak with an accountant about tax, GST and duty implications. Your lawyer can structure the legal documents, but tax advice should come from a qualified tax adviser.
Should My Equity Vest Over Time?
It depends, but vesting is often worth considering if your buy in is linked to your future work, contacts or performance in the business.
Vesting means you don't get to keep all of your equity immediately, or you may be required to sell some of it back if you leave too early. It's common in startups, but it can also work well in small business buy-ins where a new partner is expected to contribute more than money.
For example, you might agree to buy 20% of a marketing agency, with 10% issued at completion and the remaining 10% vesting over two years while you bring in clients and manage a team. If you leave after six months, you may only keep the vested portion.
Vesting can protect both sides:
- For the existing owner - it reduces the risk of giving away equity to someone who leaves quickly.
- For you - it can make a lower upfront payment possible if part of the value is earned through your contribution.
- For the business - it keeps ownership aligned with the people actually building the business.
The agreement should be very clear about what triggers vesting. Time-based vesting is simpler. Performance-based vesting can work, but only if the targets are objective, measurable and within your control.
Be careful with vague targets like help grow the business or improve operations. If the relationship breaks down, those words can be hard to apply. Better targets might refer to signed revenue, retained clients, completed systems or agreed management responsibilities.
If shares are being issued or bought back, the Corporations Act 2001, company constitution and ASIC processes all need to be handled properly. Don't leave the paperwork until later.
What Restraints And Exit Terms Should Be Included?
Your buy in agreement should include restraint and exit terms, because most disputes become harder when there's no agreed way for someone to leave.
Exit terms answer practical questions like:
- Can you sell your interest to someone else?
- Do the existing owners get a first right to buy it?
- How is the buy out price calculated?
- What happens if someone dies, becomes seriously ill, resigns or is removed?
- Can an owner be forced to sell for serious misconduct?
- What happens to shareholder loans, guarantees and unpaid dividends on exit?
Restraints deal with what an owner can and can't do after leaving. For example, the agreement might stop a departing owner from poaching staff, contacting key clients or setting up a competing business within a defined area for a defined period.
Australian courts generally look at whether a restraint is reasonable and protects a legitimate business interest. A restraint that's too broad may be hard to rely on. A clause that says you can never work in the industry anywhere in Australia is much more vulnerable than a clause tied to real clients, a reasonable area and a sensible time period.
For a local cafe, a restraint might focus on a few kilometres and a limited period. For an online SaaS business with national customers, the geography may be less important than client and staff non-solicitation.
Your exit clause should also deal with valuation on exit. You may want different pricing rules depending on whether someone is a good leaver or bad leaver. For example, a voluntary exit after five years might be valued at market value, while an exit for fraud or serious breach might trigger a discounted buyback.
These clauses can feel awkward to discuss at the start. In practice, they often keep the relationship healthier because everyone knows the rules.
Business Partner Buy In Agreement Template: What To Include
A business partner buy in agreement template should only be treated as a starting point, because the details need to match the structure, valuation and people involved.
Here is a practical outline you can use to prepare for your lawyer. It isn't a finished legal document, but it will help you organise the deal:
- Parties - list the buyer, seller, company, partnership, trust and any guarantors.
- Business Details - include the business name, ABN, ACN if applicable, premises and key assets.
- What Is Being Bought - state whether you're buying shares, units, a partnership interest or assets.
- Purchase Price - record the amount, deposit, payment dates and whether any amount is refundable.
- Valuation Basis - describe the agreed valuation method and financial records relied on.
- Equity And Voting Rights - set out your ownership percentage, voting power, dividends and management rights.
- Conditions To Completion - include due diligence, finance, lease consent, contract consent and IP transfer requirements.
- Warranties - record promises about debts, compliance, ownership of assets, disputes and financial records.
- Vesting Or Earn-In Terms - explain any time-based or performance-based ownership rules.
- Owner Roles - describe work hours, duties, pay, director roles and decision-making processes.
- Restraints And Confidentiality - protect client relationships, staff, trade secrets and confidential information.
- Exit And Buyback Rules - set out sale rights, first rights, valuation on exit and good leaver or bad leaver rules.
- Completion Steps - list share transfers, buy out steps, ASIC updates where required, registers, consents and handover items.
- Dispute Process - include practical steps for resolving deadlocks before the business is damaged.
Cost usually depends on how complex the deal is, how many documents need to work together and how much negotiation is involved. A free template is cheaper upfront, but it may not deal with your structure or exit risks. A traditional firm may bill by the hour, which can be suitable for complex transactions but harder to budget for. An online fixed-fee legal service can usually give you the scope and price upfront after reviewing what you need.
Before you sign anything, make sure the final agreement has been tailored to your deal. The clauses that matter most are often the ones a generic template leaves blank.
Key Takeaways
- A business partner buy in agreement should record the price, equity, payment terms, decision-making rights and exit rules before money changes hands.
- Due diligence should cover the entity, finances, contracts, employees, lease, intellectual property, privacy and consumer law compliance.
- Valuation and equity need to be clear, especially where money goes into the company rather than to an existing owner personally.
- Vesting can be useful where your ownership depends on future work, revenue, clients or performance in the business.
- Restraints and exit terms aren't just legal fine print. They protect the business if an owner leaves, competes or wants to sell.
- The right documents depend on whether you're buying shares, units, a partnership interest or business assets.
If you'd like help with your buy in agreement, due diligence, shareholder or partnership documents, and exit terms, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.
Drafted by Taylor, Sprintlaw's AI, and overseen by Alex Solo. How we write
Control the transaction before completion
What should the buyer or seller line up?
Deal perimeter, due diligence, liabilities, employee and contract transfers, approvals and completion mechanics need to be resolved as one transaction.








