Built for Australian Service Businesses
Bill the change order before scope creep eats the margin.
OneBookPlus runs the full professional-services engagement — e-signed SOWs, billable time tracked against budget, retainer drawdown, marked-up disbursements and GST invoicing — in one Australian app for agencies, consultants and freelancers. All-in-one for $0–$69/mo — replaces Accelo + Xero + DocuSign.





The average boutique consultancy saves $110+/mo per fee-earner replacing Accelo + Xero + DocuSign + a CRM with OneBookPlus.
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Retainer billing, deliverable tracking, scope-creep guardrails
Open the Marketing Agencies guide →Engagement letters, time-billed projects, expense pass-throughs
Open the Consultants guide →Quote, invoice, get paid; PAYG / BAS for solo operators
Open the Freelancers & Sole Traders guide →Free Tools & Resources
8-step founder guide — ABN, GST, PI, engagement letters, pricing, first 10 clients for consultants, agencies, and freelancers.
Open →Operator GuideHourly vs fixed-fee vs retainer vs value-based — when each model wins, AU benchmarks, and how to phase fees.
Open →ReferenceDrafting a tight SOW — deliverables, acceptance criteria, scope creep clauses, change-request workflow.
Open →ReferencePI insurance for consultants, marketing agencies, and freelancers — typical $1–5M cover, premium ranges, run-off.
Open →InteractiveInteractive — target salary, billable utilisation, overheads, GST + super, daily/hourly rate.
Open →Key takeaways
5Everything you need
Engagement letters, time billing, project budgets, retainers, expense pass-throughs, GST. The full lifecycle of a professional services engagement, on your phone — not spread across four tools that never speak to each other.
Reusable engagement letters and SOWs that set scope, deliverables, fees, and out-of-scope rates up front. Clients e-sign on their phone and the signed PDF lives against the contact — your defence the first time scope creep hits.
One-tap start/stop timers tagged to project, client, and activity. Idle reminders on the phone, weekly utilisation by consultant, and a billable-vs-non-billable split that lands on the dashboard without you running a report.
One project, three billing modes. Charge fixed-fee, hourly with WIP caps, or monthly retainer with rolling unused-hours policy. Every invoice cites the engagement letter, line-itemises hours, and applies 10% GST automatically.
Snap a receipt, tag it to a project, choose markup or at-cost — and it lands on the next invoice as a clearly itemised disbursement. Travel, software, third-party subcontractors, all flagged before sending so nothing is written off by accident.
Each client gets a private portal — current SOW, hours-to-date against budget, draft invoices, and an approval queue for change orders. No more chasing approvals over email; the audit trail lives in the portal with timestamps.
Every invoice carries your ABN, displays 10% GST, and meets ATO tax-invoice requirements. At BAS time the quarterly summary exports as a PDF; PAYG instalments and contractor TPAR are tracked across the year so nothing surprises you in July.
Free plan available · No credit card · Cancel anytime
Free Website Included
Stop paying $30–80/mo to Wix or Squarespace — and skip the $1,500–3,000 up-front for a designer. Every OneBookPlus consultants & agencie gets a branded booking page on the free plan. Want it on your own domain like a proper business website? $15/mo and we host it for you.
your-business.onebookplus.com.auoronebookplus.com.au/book/your-businessyourbusiness.com.au— custom branded domain, we host the siteA prospect books a paid discovery call or scoping session through your branded page at 9pm. The enquiry lands in your dashboard with their brief and budget — ready to turn into an engagement letter the next morning.
Brand color picker in settings. Logo upload. Trade licence number shown on every page so customers know you're legit.
Half-day strategy workshop from $1,800. Brand audit $2,500. Customers see prices before booking — kills the price-shopping phone calls.
70%+ of advisory searches happen on phones. Your booking page is built mobile-first; loads in under 2 seconds on 4G.
Already own yourbusiness.com.au? Add the Booking Website app ($15/mo) and point your domain at the booking page we host for you. We don't sell domains — keep yours wherever you registered it.
Schema.org markup for advisory services + suburbs you cover. Google finds you for 'management consultant in [suburb]' searches.
Consultants & agencies website cost — typical
Website builder
Wix, Squarespace or similar
Web hosting + SSL
Bundled in builders; separate if custom site
Designer (one-off)
Only if you want a custom-built site
Bookings on Calendly
Separate from your website
Typical recurring total
~$60–100/mo
+ $1,500–3,000 up-front if you hire a designer
With OneBookPlus
Your total
$0–15/mo
See it in action
Not mockups — the real product screens for a working week of billable engagements.
Reusable scope, deliverables, fee structure and out-of-scope rates. The client signs from their inbox; the version-stamped PDF lives against the contact as your defence the first time scope creep hits.

Realisation, utilisation per fee-earner, AR aging and margin per project — the leading indicators a principal runs the week off, not a generic ledger. Spot a budget blow-out at week two, not at month-end.

Hourly time blocks, fixed-fee milestones and retainer drawdown combine into one branded PDF with your ABN and 10% GST. Marked-up disbursements line-itemised so nothing gets written off by accident.

Simple workflow
From engagement letter to paid invoice in four steps — designed around a typical week for a consultant, agency, or freelancer.
Pick an SOW template, fill the scope, deliverables, fee structure, and out-of-scope rates. Send to the client for e-signature from your phone — most are signed inside a day.
Hit start on the timer when you open a deck, take a call, or write a brief. Tag the activity to the project. Idle prompts on mobile catch the calls you forgot to log.
Generate invoices weekly, fortnightly, or monthly. Hourly time blocks, fixed-fee milestones, and retainer drawdowns all combine into one branded PDF with GST applied automatically.
Clients pay online via the invoice link. Your dashboard rolls up realisation, utilisation, and project margin so you spot a scope blow-out at week two, not at month-end.
Most consultants send a real SOW within 15 minutes of signup
85%+
Target billable utilisation for senior consultants
$0
Free plan — no monthly fees to get started
21 days
Average AR-aging improvement after switching
100%
GST, BAS, and PAYG compliant out of the box
Practice savings calculator
Adjust the numbers below to match your real monthly spend. The total updates live — and so does what you'd save by replacing the lot with OneBookPlus.
Accounting (Xero, MYOB, QuickBooks)
Monthly subscription
Jobs & quotes (Accelo, WorkflowMax, Streamtime)
Per-user/mo for trade tools
Website + hosting (Wix, Squarespace)
Builder + hosting bundle
Bookings (Calendly, Acuity)
Separate online booking tool
CRM (HubSpot, Pipedrive)
Customer pipeline tracking
Email marketing (Mailchimp, Klaviyo)
Newsletter + campaigns
Your current stack
$176/mo
= $2,112/year
With OneBookPlus Starter
$29/mo
Replaces everything in the list. One bill.
Free plan available · No card required · Cancel anytime
Scroll through the day from morning to 5pm: the AI receptionist answers and books a missed call, the work runs from the app, the GST invoice is sent on the spot, payment lands and the books balance themselves, a five-star review is requested automatically, and the day closes with the ledger already written.
8:00am
While you're with a client
A retail founder needs a pricing review before July. She calls the first consultancy on Google — yours. You're mid-workshop.
AI Receptionist
The AI answers in two rings, books a 10am discovery call and emails her a confirmation — while you're still presenting.
Discovery call
The engagement card is ready: company notes, scope prompts, your standard rates pre-filled from your fee schedule.
Between meetings
One tap turns the signed scope into a GST invoice with a pay link. No re-keying into another system tonight.
While you're in a workshop
The $2,750 engagement deposit lands by card, the books update themselves and $250.00 GST is set aside for BAS.
Reputation on autopilot
Two hours after payment the AI requests a review. The founder leaves five stars before her school run.
The day closes itself
You ran two engagements and signed a third. The book did the rest.
$0
collected
0
admin tasks done by AI
0
evenings lost
Professional-services pricing
Start free, upgrade when the billables justify it. No contracts, no setup fees, no per-seat tax that punishes you for hiring associates. Cancel any time.
Free
$0/forever
Send your first engagement letter today — no credit card.
Starter
$29/mo
Replaces Accelo + Xero + DocuSign for a two-to-three-person firm.
No card · Drops to Free if you don't upgrade
Growth
$69/mo
For agencies running 5+ fee-earners and chasing new business.
Prices in AUD inc. GST. Stripe processing fees apply to card payments (1.7% + 30¢ AU cards). Full plan comparison →
Already on another tool?
Most firms move across in a single evening. Export your clients and active projects as CSV from your current tool, import them into OneBookPlus with the bulk importer, and you're billing on the new platform before the next invoice run.
Switch from
Built-in AI
You're in back-to-back meetings — new enquiries hit voicemail and go cold before you call back.
OneBookPlus
AI Receptionist · incoming call
“I need help with my BAS — can we book a call?”
If you don't answer, the AI books it — Consultation · Wed 11:00am — and texts a confirmation.
Built in Melbourne, AU
ATO-ready from day one
256-bit encryption
No credit card needed
Common questions about professional services software in Australia.
For one-to-twenty-person Australian professional service firms — agencies, consultancies, sole-trader contractors — the typical stack is a practice-management tool (Accelo, Streamtime, WorkflowMax) plus accounting (Xero or MYOB) plus a contracts tool (DocuSign or PandaDoc). Combined that runs $90–$300+ per user per month. OneBookPlus consolidates engagement letters, time tracking, project billing (fixed, hourly, retainer), expense pass-through, GST-compliant invoicing, and BAS-ready reporting into one platform from $0/month on the Free plan to $69/month on Growth.
You build SOW templates for the engagement types you sell — fixed-scope project, hourly retainer, monthly retainer with rollover, advisory-only — and the platform fills in the client, fees, deliverables, and out-of-scope rates. The client e-signs on their phone, the signed PDF is stored against the contact, and every invoice you raise on that engagement cites the SOW reference. When a change request comes through, you raise a numbered change order against the original SOW, the client approves it in their portal, and the new rates flow through automatically.
Yes. Set the monthly retainer amount, the included hours, the overage rate, and the rollover policy (cap or no cap). Each month the system drafts the invoice for the retainer fee, lists hours used against the allowance, and adds overage hours at the agreed rate. Unused hours roll into next month up to the cap. Clients see this in their portal in real time so there are no end-of-month disputes about what was covered.
Every invoice automatically calculates 10% GST, displays your ABN, and meets the ATO tax-invoice requirements. Expenses and disbursements are GST-coded as you log them. At BAS time, the quarterly summary exports as a single PDF showing GST collected, GST paid on expenses, and the net amount owed — your accountant gets it in two clicks, or you lodge it directly. PAYG instalments and the contractor TPAR are tracked alongside so nothing comes as a surprise.
Yes — the Free plan covers solo consultants and freelancers with unlimited invoices, time tracking, and up to five clients. As you bring on associates or grow into a small agency, the Starter and Growth plans add multi-user time entry, per-consultant utilisation reporting, retainer management, and the client portal. Most firms stay on Growth until they grow beyond fifteen to twenty fee-earners.
About the author
Founder & CEO, OneBookPlus
Bishal has over a decade of experience in digital marketing, web development, and small business consulting across Australia. He has worked directly with dozens of Australian professional service firms — boutique consultancies, independent advisors, marketing agencies, and solo freelancers — helping them tighten engagement letters, time billing, project margins, and BAS reporting.
If you run a small Australian agency, a boutique consultancy, or a solo advisory practice, you already know how the tool stack creeps. Accelo or WorkflowMax for practice management. Xero for accounting. DocuSign or PandaDoc for engagement letters. HubSpot or Pipedrive for the client pipeline. Maybe Toggl or Harvest for time. None of them talk properly, the per-user pricing stacks up faster than billables, and somehow you still end up updating a spreadsheet to work out which client is profitable. OneBookPlus replaces that lot with one app designed around the way professional service firms actually earn — engagement, scope, time, invoice, cash.
The platform covers the full lifecycle from first contact through paid invoice. A prospect comes in via your booking page, an inbound email, or a referral. You add them to the CRM, qualify the engagement, and draft the SOW from a template you have already tuned — fee structure, deliverables, payment terms, out-of-scope rates. The client e-signs on their phone in under a day; the signed PDF lives against the contact, version-stamped. From there the engagement converts to a project with a budget, an assigned consultant or team, and a billing cycle. Your team tracks time against the project from the phone or desktop. At the end of each cycle the invoice is generated automatically — hourly time blocks itemised, fixed-fee milestones applied, retainer drawdown shown — with 10% GST applied and your ABN on every line. Clients pay online via the invoice link. The dashboard rolls up realisation, utilisation, AR aging, and margin per project so the principal is never guessing.
Picture a typical Wednesday at a four-person Sydney consultancy. The principal opens OneBookPlus at 7:30am over a coffee — three active engagements visible on the dashboard, one with a change order awaiting client approval, one at 78% of budget with two weeks left, one freshly signed. The change-order client approves it in their portal at 9:12am with one tap; the principal gets a push notification and the new rate flows through to the next invoice automatically. The two associates open their phones and see the day's allocation — Associate A is on the strategy piece for Client A, billed at $280/hour against a fixed-fee milestone. Associate B is splitting the day between two retainer clients. Both hit start on the timer when they open a deck and stop when they switch tasks. Idle prompts on the phone catch the calls they would otherwise have forgotten to log. By 4pm the principal reviews the day's logged time, approves it for next week's invoice run, and books two intro calls with new prospects. At 5pm the dashboard shows the firm is on track for 84% utilisation this week, AR aging is down to 28 days, and one expense receipt — a $340 user-research subscription — is queued for client pass-through with a 10% admin markup. No spreadsheet open.
OneBookPlus connects to your business bank account and pulls in transactions automatically. When a client pays an invoice, the system matches the payment to the invoice for you — no manual reconciliation, no opening Xero on a different tab. Expenses are pulled in alongside, GST-coded as you tag them, and matched to projects for either at-cost pass-through or marked-up disbursement. Subcontractor payments are tracked against the TPAR you will need to lodge with the ATO each August. Software subscriptions, travel, professional development — all categorised against revenue so you can see real margin per project, per client, and per consultant, not just what you invoiced. When BAS time arrives, the quarterly summary exports as a single PDF — GST collected, GST paid on expenses, PAYG instalments — and your accountant has what they need in two clicks. Many sole-trader consultants and freelancers self-lodge the BAS directly out of the dashboard.
Sign up in under a minute — no credit card required. Add your ABN, upload your firm logo, set your default payment terms (NET14 is standard for boutique advisory; NET30 for retainer agencies), and pick or customise an engagement-letter template. Import your client list from a CSV, Xero export, or HubSpot export. Most consultants send their first engagement letter within fifteen minutes of signing up and have a signed SOW back inside a day. The free plan covers solo operators with unlimited invoices, quotes, engagement letters, and up to five active clients — enough to try it on real engagements before committing. When you are ready for multi-user time tracking, retainer management, the client portal, and bank feeds, upgrade to Growth at $69/month — still a fraction of what Accelo + Xero + DocuSign + a CRM would cost for the same firm, with the same data in one place instead of four.
Join Australian consultants, agencies, and freelancers running engagement letters, time billing, and GST invoicing in one place. Free to start — upgrade when you are ready.
Get Started FreeLast reviewed and updated: by Bishal Shrestha
Authoritative sources
Australian professional service firms operate under ATO tax-invoice, GST, PAYG and TPAR rules, Personal Services Income (PSI) tests, Australian Consumer Law, and — for most advisors — Professional Indemnity cover. We cite the primary bodies for the claims on this page so you can verify directly.
Comparisons
Tools & Apps
Free for solo consultants & freelancers
60-sec sign-up · No card · GST & BAS ready
Who it's for
From a solo strategy consultant to a fifteen-person creative agency — OneBookPlus adapts to how you scope, bill, and get paid.
Advisory and strategy work billed by the day or hour. Needs e-signed engagement letters, time tracking against budget, and NET14 invoices with GST and ABN on every line.
Monthly retainers plus project work for 8–15 clients. Needs retainer drawdown with rolling unused hours, deliverable tracking, and a change-order workflow that holds up when scope creeps.
Design, copywriting, or development billed per project. Needs fast mobile quoting, Stripe pay links, and PAYG/BAS handled without an accountant on retainer.
Several fee-earners across advisory, creative, and implementation. Needs per-consultant utilisation, realisation reporting, and project margin rolled up to the principal — not buried in four tools.
Stop overpaying
Most small businesses stitch together 4-6 tools that don't talk to each other. Here's what that typically costs.
Or use OneBookPlus
$29/mo
Real-world scenario
How a four-person advisory firm runs a typical Wednesday on OneBookPlus
7:30am. Priya opens OneBookPlus over a coffee in Fitzroy — three active engagements on the dashboard. One change order for a retail client is awaiting approval; one transformation project is at 78% of its $48,000 fixed-fee budget with a fortnight to run; one retainer was signed yesterday.
The change-order client approves it from their portal at 9:12am with one tap. Priya gets a push notification and the new rate — $295/hour for the extra discovery stream — flows straight into the next invoice. No emailing a fresh SOW back and forth.
Her two associates open their phones and see the day's allocation. Liam is on the strategy deck for the transformation project, billed against a fixed-fee milestone; Sana is splitting the day between two monthly retainer clients. Both hit start on the timer when they open a deck and stop when they switch tasks. The idle prompt on Sana's phone catches a 40-minute client call she'd otherwise have forgotten to log.
2pm. A $340 user-research subscription receipt gets snapped and tagged to the retail client for pass-through with a 10% admin markup — itemised on the next invoice instead of quietly written off.
End of day: time approved for Friday's invoice run, the firm is tracking to 84% utilisation this week, AR aging is down to 26 days, and a draft retainer invoice for $6,500 + GST is queued. Come BAS time, the quarterly summary — GST collected, GST on expenses, PAYG instalments, contractor TPAR — exports in one click. No spreadsheet open all day.
How we compare
How we compare to the practice-management and accounting tools service firms typically run.
| Feature | OneBookPlus | Accelo | WorkflowMax | Xero |
|---|---|---|---|---|
| Engagement letters & e-signature | Yes | No | No | No |
| Time tracking by project & client | Yes | Yes |
Everything above included. One app, one login.
| Yes |
| No |
| Retainer billing with rolling hours | Yes | Yes | No | No |
| Expense pass-through & disbursements | Yes | Yes | Yes | Yes |
| Client portal & change-order approvals | Yes | Yes | No | No |
| Utilisation & realisation reporting | Yes | Yes | Yes | No |
| GST invoicing + BAS export | Yes | No | No | Yes |
| Bank-feed reconciliation | Yes | No | No | Yes |
| Contractor TPAR tracking | Yes | No | No | Yes |
| Free plan available | Yes | No | No | No |
| Price | From $0/mo | $50+/mo/user | $45+/mo | $35+/mo |