Founder Guide · Updated 18 May 2026
How to Start a Service Business in Australia, 8-Step Guide
For consultants, agencies, and freelancers. Action-ordered and AU-specific, niching, ABN and PSI rules, GST, professional indemnity, engagement letters, pricing, software stack, and your first ten clients.
In this guide
- 1. Define your offer and niche
- 2. Pick your structure: sole trader vs Pty Ltd (and watch PSI)
- 3. Register for GST when (or before) you cross $75,000
- 4. Buy your insurance: PI is the non-negotiable
- 5. Write proper engagement letters and SOWs
- 6. Pick a pricing model and stick to it
- 7. Build a lean software stack
- 8. Land your first ten clients
Define your offer and niche
Generalist service businesses lose to specialists every time. Before registering anything, write a single sentence that names the customer you serve, the outcome you deliver, and the price band. The sharper the niche, the cheaper the marketing and the higher the close rate. "I help Sydney boutique law firms migrate from PCLaw to Actionstep in 60 days" wins against "I'm a consultant", every time.
Ideal customer profile
Industry, company size, role of the buyer, geography. Two-line write-up, pin it above your desk.
Outcome you sell
Not 'consulting', name the outcome. Migration done, audit passed, campaign launched, pipeline built.
Price anchor
$5k engagements, $50k engagements, or $500k engagements behave totally differently. Pick one band.
Proof you can show
Two case studies or testimonials beat a beautiful website. Engineer the first two even if discounted.
Positioning vs incumbents
Who do you replace, and why? 'Cheaper than McKinsey' is not positioning, name the wedge.
Repeatable delivery
Productise the engagement: kickoff, discovery, build, handover. Repeatable = profitable.
Pick your structure: sole trader vs Pty Ltd (and watch PSI)
Most consultants and freelancers start as sole traders because it's the cheapest setup and the simplest tax position. The crossover to a Pty Ltd company is usually triggered by liability concerns, by an enterprise client who refuses to contract with an individual, or by tax planning once profit is consistently above ~$150k. There is a third trap unique to service businesses: the Personal Services Income (PSI) rules. The ATO can ignore your company structure and tax profits at your personal marginal rate if more than half your income from a client comes from your personal effort or skills and you fail the PSI tests. Plan around PSI before you incorporate, not after.
Sole trader
Cheapest, simplest. Profits taxed at personal marginal rate. Personal liability, make PI insurance non-negotiable.
Pty Ltd company
Setup ~$500 + annual ASIC fee ~$300. Limited liability, 25% small-business tax rate, separates personal and business finances.
Partnership
Two operators sharing P&L. Document a partnership agreement before you trade together, the 'handshake partnership' is where service businesses die.
Discretionary trust
Useful where the operator has a non-working spouse and the income passes PSI tests. Setup ~$1,500 to $2,500, get tax advice first.
PSI, results test
Pass if you're paid to produce a result, supply your own tools, and bear the risk of fixing defects at your own cost.
PSI, 80% rule
If 80%+ of your PSI comes from one client, you must use that single client as your sole basis for the result test, high audit risk.
PSI, unrelated clients test
Two or more unrelated clients sourced via public offer (not word-of-mouth alone). Document marketing activity.
PSI, employment test
Engage an unrelated employee, apprentice, or contractor who does at least 20% of the principal work.
Register for GST when (or before) you cross $75,000
The Goods and Services Tax (GST) registration threshold for a service business is $75,000 in annual turnover (or projected turnover). Cross it without registering and you'll owe the ATO 1/11th of every invoice you raised retrospectively, out of your own pocket. Most service operators register from day one because B2B clients prefer GST-registered suppliers, they can claim back input tax credits on subscriptions and gear, and it removes the threshold-watching anxiety. The downside is quarterly Business Activity Statements (BAS) and an extra layer of bookkeeping discipline.
Threshold
$75,000 turnover per 12-month rolling window. Project conservatively, going $5k over without registering is a costly mistake.
How GST works
Add 10% to invoices. Each BAS, remit GST collected on sales minus GST paid on business expenses (input tax credits).
BAS frequency
Quarterly for almost every starter. Monthly if turnover >$20m. Annual reporting available for some small operators.
Input tax credits
Subscriptions (Notion, Slack, Linear, accounting), professional fees, equipment, training, claim GST back on each.
Cash vs accrual
Cash basis is easier for small operators, GST owed when invoice paid, not when raised. Most sub-$2m businesses choose cash.
When to delay registration
If your buyers are non-GST-registered individuals (e.g. retail consumer audience), staying under threshold and unregistered keeps you ~10% cheaper. Rare in B2B services.
Buy your insurance: PI is the non-negotiable
Service businesses sell advice, work product, and intellectual output. When something goes wrong, a recommendation that costs the client money, a deliverable that misses a deadline, an error in a deliverable, the claim path is professional indemnity (PI) insurance. Public liability (PL) covers physical damage; it's a distant secondary concern for desk-based service operators but still useful for site visits and client-office attendance. Some enterprise contracts will not engage you without certificates of currency, get the policy before you chase the contract, not after.
Professional indemnity (PI)
$1M to $5M limit of indemnity is standard for boutique consulting; tech and architecture firms often need $10M+.
Public liability (PL)
$10M minimum if you ever visit a client site or host clients in your office. Cheap when bundled.
Cyber & privacy
Increasingly standard. Covers data-breach response costs, ransom, and third-party claims. Mandatory for any operator handling client PII.
Management liability
Pty Ltd directors, D&O cover protects personal assets against company-level claims. Cheap top-up.
Workers comp
State-specific scheme. Mandatory the moment you have a single employee (including casual).
Run-off cover
Critical when you cease trading, claims-made PI requires ongoing premium to cover historic work. Plan for 7 years.
Write proper engagement letters and SOWs
Verbal scope is the single biggest source of unprofitable service work in Australia. The fix is documented engagement letters and Scopes of Work (SOWs) for every paid engagement above a trivial threshold. The engagement letter sets out the commercial relationship, parties, services, fees, payment terms, IP, confidentiality, dispute resolution. The SOW gets specific, deliverables, milestones, acceptance criteria, exclusions, change-request process. The two documents together collapse 90% of mid-project arguments because the answer is always "check the SOW".
Engagement letter essentials
Parties, services described in scope, fees and payment terms, IP ownership, confidentiality, termination, dispute resolution clause.
Scope of Work (SOW)
Itemised deliverables, milestones, acceptance criteria, exclusions, change-request mechanism. Signed by both parties before work starts.
Master Services Agreement (MSA)
For repeat clients, the MSA covers all general terms; each new SOW just references it. Cuts re-signing overhead.
Acceptance criteria
How is each deliverable judged 'done'? Vague criteria = endless revision loops. Spell it out: 'document of <X pages> covering <Y topics>'.
Termination clauses
Notice period (typically 30 days), payment for work-in-progress, return of confidential information, post-termination IP rights.
IP ownership
Default position: client owns the deliverables, you retain background IP (methodologies, frameworks, templates). Document explicitly.
Pick a pricing model and stick to it
Service businesses have four credible pricing models, hourly (time and materials), fixed-fee, retainer, and value-based, plus hybrids that combine elements of each. The pricing model you pick shapes everything downstream: who buys from you, how you sell, how you scope, how profitable each engagement is, and how stressful month-end becomes. Hourly is the path of least resistance but capped at the hours-in-a-week ceiling. Fixed-fee aligns your incentives with finishing fast but punishes scope creep. Retainers smooth cash flow but invite mission creep. Value-based is the highest-margin model but the hardest to sell. Choose deliberately.
Hourly (T&M)
Bill hours worked × rate, usually with a not-to-exceed cap. Easy to start, hard to scale, client always wants the lowest number.
Fixed-fee per deliverable
Quote a flat amount for a defined scope. Incentivises efficient delivery, but scope creep eats margin if SOW is loose.
Monthly retainer
Recurring fee for ongoing access or capacity. Predictable revenue, but invites 'while-you're-here' work. Cap hours explicitly.
Value-based pricing
Fee tied to a percentage of value delivered (e.g. % of revenue uplift, % of cost saving). Highest margin, requires deep trust.
Hybrid retainer + project
Common in agencies, small retainer for capacity, larger fixed-fee for one-off projects. Smooths the curve.
Pricing for sole traders
PAYG withholding doesn't apply to sole-trader fees, your client doesn't withhold tax. You manage your own quarterly PAYG instalments via the ATO.
Build a lean software stack
Service businesses can drown in tools. The smallest viable stack is six tools: a knowledge base for client work, a chat tool for team comms, a project tracker, an accounting and invoicing platform, a CRM (even a lightweight one), and a way to receive payments. Don't add a seventh until the existing six are fully exploited. Watch GST input-tax-credit eligibility, most B2B SaaS tools are GST-inclusive when supplied to Australian businesses and the credit is recoverable.
Knowledge base / docs
Notion, Coda, or Confluence. Client folders, SOWs, status reports, internal SOPs. The single source of truth.
Team chat
Slack or Teams. Channels per client + internal ops. Set 'no notifications after 6pm' as a team-health rule.
Project & task tracking
Linear (engineering), Asana, ClickUp, or Trello. Discipline matters more than tool, one tracker, every task.
Accounting + invoicing
Xero, MYOB, or QuickBooks for accounting. Invoicing layer can be in OneBookPlus for branded quote-to-pay flow.
CRM
HubSpot Free, Pipedrive, or Attio. Doesn't need to be heavyweight, pipeline visibility is the win.
Payments
Stripe + bank transfer for AUD invoices. Pay-Now links on invoices typically halve days-sales-outstanding (DSO).
Calendar & scheduling
Calendly, Cal.com, or SavvyCal for client meetings. Embed on your site to short-circuit email tag.
Loom / async video
Replaces 30% of internal meetings. Loom + a written changelog beats a Zoom call for status updates.
Land your first ten clients
The first ten clients are disproportionately hard. You have no track record, no Google reviews, no case studies the buyer recognises. The fastest path is concentrated outbound to a narrow niche, plus systematic exploitation of existing relationships and platforms. Avoid the temptation to compete on price, service businesses with discounted intro pricing rarely escape the cheap-reputation trap. Heavily discount in exchange for case-study rights or referrals, not for cash.
Warm network
Email your 100 closest professional contacts with a clear specific ask, 1 intro to a buyer in your niche.
LinkedIn outbound
30 personalised connection requests per day to ICP buyers. Useful content + DM-driven conversations beat InMail spam.
Niche directories
Industry-specific listings (legal, finance, marketing, engineering). Pay for the directories your buyers actually read.
Podcast guesting
Pitch 20 podcasts your ICP listens to. One good 60-minute interview = 6 months of inbound from the right people.
Speaking + meet-ups
Local industry meet-ups, AICD events, sector conferences. Speaking > attending. Even a 10-minute lightning talk converts.
Referral fees
Document a 5 to 10% referral fee for first-year revenue. Make it easy for happy clients and adjacent professionals to refer.
Content + SEO
Long-tail buyer-intent posts on your specific niche. 12 posts ranked = a steady inbound stream within 12 months.
Strategic partnerships
Adjacent service providers (accountants ↔ lawyers ↔ marketers) cross-refer constantly. Build 3 to 5 partnerships before chasing cold leads.
Avoid the pitfalls
Six rookie mistakes that compound fast
The mistakes below cost solo founders the most margin in their first 18 months. Each one is cheap to avoid up-front and expensive to unwind later.
Quoting hourly when the client wants a fixed price
Buyers in the $5k to $50k engagement band almost always prefer fixed-fee. Hourly quotes lose to fixed-fee competitors even when the fixed-fee number is higher, certainty beats theoretical savings.
No engagement letter for 'small' jobs
The $3k engagements eat more margin than the $30k ones because nobody bothered with a SOW. Write the engagement letter for every paid engagement above $1k.
Ignoring PSI rules
Operators who incorporate to 'split income' without passing PSI tests get tax-adjusted to personal marginal rates plus penalties. Get tax advice before incorporating.
Mixing personal and business finances
Even as a sole trader, run a separate business bank account. Audit defence, BAS prep, and tax filing all become 5× easier.
Under-insuring on PI
A $1M PI policy looks generous until you're 3 weeks into a $200k engagement that's gone wrong. Buy the cover that matches the engagement sizes you actually sell.
Free advice as a sales tool
"Pick your brain" coffees and unpaid scoping sessions teach buyers your time is free. Replace with a paid discovery sprint or productised audit at $2k to $5k.
Practical tips for first-year operators
Productise your first engagement
Even bespoke consulting work has a 70% repeatable spine. Turn the first engagement you sell into a named, scoped, priced "product", the second sale is 3× easier when you can point to a fixed deliverable list.
Bill weekly, not monthly
For T&M and milestone work, switch from monthly to weekly invoicing. Days-sales-outstanding (DSO) drops, cash flow smooths, and disputes get caught while they're still small.
Hire your accountant before your bookkeeper
A registered tax agent who understands PSI, GST, and small- business CGT concessions saves more than they cost in year one. Defer bookkeeping software until they recommend one.
Track utilisation honestly
Billable hours / total work hours is the single most useful health metric for a service business. 60% is good for solo, 50% is good for an agency. Anything under 40% means you have a sales or staffing problem, not a delivery problem.
Frequently Asked Questions
Do I need an ABN to invoice clients as a freelancer in Australia?
Yes, almost always. Without an ABN on your invoice, your business client must withhold 47% of the invoice value and remit it to the ATO as 'no-ABN withholding'. The exception is one-off jobs invoiced under $75 (GST-exclusive), but in practice, register the ABN. It's free and takes 15 minutes at abr.gov.au.
When should I switch from sole trader to Pty Ltd?
Three triggers: (1) profit consistently above $150k to $180k per year, where the 25% small-business company tax rate plus retained earnings starts to outweigh personal marginal rates; (2) enterprise clients who refuse to contract with an individual; (3) genuine liability concerns where a personal-asset shield matters. Always get accountant advice before switching, the change isn't a one-way door, but it's not costless either.
What is PSI and why does it matter for service businesses?
Personal Services Income (PSI) is income earned mainly as a reward for your personal effort or skills. If you fail the PSI tests, the ATO disregards your company or trust structure and taxes the income at your personal marginal rate, and disallows many deductions. Most solo consultants, contractors, and freelancers are at risk. You pass the rules by either (a) satisfying the 'results test' (paid for a result, your tools, your risk of rectification), or (b) demonstrating unrelated clients, employment, or business premises. Get tax advice before structuring, PSI is the #1 thing accountants warn new consultants about.
Should I register for GST from day one?
For B2B service businesses, almost always yes. Reasons: (1) your business clients can claim back the GST so the 10% doesn't cost them anything; (2) you can claim back input tax credits on your own subscriptions, equipment, and professional fees; (3) it signals legitimacy on quotes and invoices; (4) you avoid the threshold-tracking anxiety. The exception is B2C consumer services under $75k turnover, where staying unregistered keeps you ~10% cheaper than competitors.
What insurance do I actually need on day one?
Two non-negotiables: professional indemnity (PI) at $1M to $5M depending on engagement sizes, and public liability (PL) at $10M+ if you ever attend client sites or host clients in your office. Add cyber/privacy cover if you handle client data (most operators), and workers comp the moment you hire anyone, including casual contractors who might be deemed employees. Total premium for a solo consultant: typically $1,200 to $2,800 per year, deductible as a business expense.
How long until a service business is profitable?
Solo consultants and freelancers in a sharp niche typically reach $80k to $150k revenue in year one (one or two anchor clients plus project work). Agencies with 3 to 5 staff usually need 18 to 24 months to clear the operating-cost hump and reach sustainable profitability. The single biggest accelerant is concentrating your marketing on a tight ICP, generalist service businesses take 2× as long to reach the same revenue.
Ready to start your service business?
OneBookPlus is the all-in-one platform for Australian service businesses, engagement letters, SOWs, invoicing, GST, time tracking, and client portal. Free to start, no credit card required, AUD billing.
Rather look before you sign up? Open a live demo account with real data in it, or compare the AUD plans on the pricing page.
Reviewed by Bishal Shrestha
About the author
Bishal Shrestha
Founder & CEO, OneBookPlus
Bishal spent a decade running digital projects for Australian small businesses before founding OneBookPlus. He writes and maintains these pages, and publishes what OneBookPlus does not do alongside what it does.
Read the founder bioHow this page was researched
The compliance and licensing statements above are taken from the bodies this page links to, including the ATO and the Australian Business Register, so you can read the rule rather than take our word for it. Plan prices come from the OneBookPlus price registry, so the page and the checkout cannot disagree. Everything said about OneBookPlus describes what the product does today, and the page says so where it does not do something.
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