Choosing a Business Structure

Ask a room of business owners why they run the structure they do, and a surprising number will say the accountant set it up that way years ago, for reasons nobody quite remembers. Yet the structure decides who pays tax on the profits, who is exposed if something goes wrong, what happens when you want to bring in a partner, and how a future sale is taxed. It deserves a better origin story than that.

The four common structures

Sole trader is the simplest and cheapest to run. The business income is your income, taxed at your personal marginal rates, and the paperwork is light. The trade-off is total exposure: there is no legal separation between you and the business, so business debts are your debts, and everything you own personally sits behind them.

Partnership shares that logic between two or more people. The partnership lodges a return but generally does not pay tax itself — each partner reports their share of the profit or loss in their own return. The exposure is shared too, and then some: a partner can generally be held liable for partnership debts, including obligations another partner took on.

Company is a separate legal entity. It pays tax on its profits at the company rate — check the current rate that applies to your company, as it depends on the circumstances — and those profits belong to the company until they come out properly as wages, directors fees or dividends. Taking money out informally creates some of the most expensive tax problems in small business. Limited liability is real but not absolute: directors sign personal guarantees for leases and finance, and carry legal duties of their own.

Trust — usually a discretionary family trust — has a trustee holding the business for the benefit of beneficiaries, with flexibility each year over who receives the income. That flexibility, and a degree of asset protection, come at the price of complexity: annual distribution resolutions with hard deadlines, extra compliance, and rules that are unforgiving when the paperwork is late or sloppy.

Asset protection is behaviour, not just paperwork

A company or trust only protects you if the separation is respected — separate bank accounts, documented loans, guarantees understood before they are signed. A structure treated as a personal wallet offers far less protection than its owner believes, and the moment that gets tested is exactly the moment it is too late to fix.

Changing later costs real money

Moving a business between structures is not an edit; it is usually a transfer of assets between taxpayers. That can trigger capital gains tax and duty, and it always brings new registrations, new bank accounts and transition costs. Rollover relief exists for some restructures, but it comes with conditions worth confirming before anything is signed. The practical lesson is not to agonise forever — it is to make the choice deliberately, because unwinding a casual one is expensive.

There is no set-and-forget structure

The structure that suited a one-person startup rarely suits the same business once profits grow, staff arrive, or family circumstances change. Treat the structure as a decision you revisit at milestones — significant profit growth, new premises, a new business partner, plans to sell — rather than as a fact of life.

What we commonly see go wrong

• Staying a sole trader long after the risk and profit profile has outgrown it, because changing feels like a hassle.
• Companies used as personal wallets, with drawings treated as tax-free money until the problem surfaces at year end.
• Trusts running for years with distribution resolutions done late, or not at all.
• Structures copied from a mate in a different industry, with different risks, income and family circumstances.

A worked example

As an illustration: an electrician starts as a sole trader and the business grows — staff, bigger contracts, real equipment. Nothing about the structure is ever revisited. Every dollar of profit lands on one personal tax return, and every contract risk points directly at the family home. When a restructure is finally considered, the business has grown enough that moving it carries meaningful tax and duty costs — the same conversation two or three years earlier would have been dramatically cheaper.

When to get help

If your profits, risks or plans have changed since the structure was set up — or if you cannot clearly explain why your business runs the way it does — a structure review is one of the highest-value conversations you can have with an adviser. We do not promise a clever answer; we promise you will understand the trade-offs before they are tested.

Is a company always better once the business is profitable?

Not always. The company tax rate can be lower than the top personal rates, but the money is not yours until it is paid out properly, and the compliance costs are higher. For some owners the overall position is no better — it depends on profit levels, how much you draw, and your plans, which is why it is a calculation rather than a rule of thumb.

Does a trust fully protect my personal assets?

No structure offers complete protection. Personal guarantees, director duties and how the structure is actually operated all cut across it. A trust or company run with clean separation offers meaningful protection; one treated as a personal wallet offers much less than its owner assumes.

What does it cost to change structure later?

It varies, but a restructure is usually a transfer of business assets between taxpayers, which can trigger capital gains tax and duty on top of the setup and transition costs. Rollover relief is available for some restructures if the conditions are met — worth confirming with an adviser before anything is signed.