How to Build a Low or Nil-Cost Finance Software Stack for Your Small Business

If you're a small business owner who's been putting off sorting your finance software because it feels expensive and complicated — this post is for you.

The truth is, you can run a pretty solid finance operation on close to zero dollars a month. And if you're willing to spend a small amount, you can get something genuinely powerful. The trick is knowing which tools actually matter, which ones are nice-to-haves, and where free tiers hold up versus where they'll slow you down.

This guide covers the core stack layer by layer — and ends with an advanced section on cashflow forecasting for those who want to go further.

Before picking tools, it helps to separate out the jobs you're actually trying to do:

Not every small business needs all of these on day one. A sole trader with simple income might get by on a spreadsheet and a free invoicing tool for years. A business with employees, GST obligations, and multiple income streams needs more structure.

Work out which jobs matter for your stage, then build the stack around that.

These are the tools that cover core bookkeeping and invoicing with a genuinely free tier — no credit card required, no arbitrary 30-day cutoff.

Zoho Books is the standout free accounting platform for Australian businesses that qualify. The free plan is available for businesses with annual revenue under AUD $50,000 and includes:

That's a full accounting function at zero cost, not a stripped-back trial. The $50k revenue cap is the primary constraint — once you're over that threshold, you'll need to move to a paid plan (Standard starts at around AUD $22/month billed annually).

Why it beats Wave for Australian users: Zoho Books has better local compliance support. GST setup and BAS reporting are handled more cleanly, and the platform is actively maintained and developed. Wave has historically been built for the US/Canadian market.

Limitation: The free plan caps you at one user. If you need a bookkeeper and yourself both in the system simultaneously, you're looking at the paid tier.

Best for: Sole traders, freelancers, and early-stage businesses turning over under $50k looking for proper double-entry accounting at no cost.

Wave has long been the default recommendation for free accounting software, and the Starter plan remains free. But it's worth being clear-eyed about where it's landed in 2026.

The free Starter plan covers:

What moved behind the paywall: Automatic bank transaction imports and auto-categorisation are now on the Pro plan at USD $16/month. On the free tier, you can still connect bank accounts, but you lose the automatic import — meaning more manual reconciliation work. Some reviewers have also flagged that CSV export of transaction data was paywalled without clear disclosure, which created real headaches at tax time.

Wave is also primarily built for the US and Canadian market. STP payroll, ATO-integrated BAS lodgement, and Australian bank feeds can be inconsistent.

Bottom line on Wave: Still usable for free, and still reasonable for very simple businesses — particularly sole traders with low transaction volume who don't need automatic bank feeds. But it has degraded meaningfully from what it was three years ago. If you qualify for Zoho Books free, that's the stronger choice.

Best for: Micro businesses and sole traders with very simple needs and low transaction volume who want zero-cost invoicing and basic books.

If your main need is invoicing rather than full double-entry bookkeeping, Zoho Invoice is completely free with no revenue cap and no client limits (within fair use). It covers:

It doesn't do full bookkeeping — you won't get a P&L or balance sheet. But if you're a consultant, freelancer, or service business that just needs to invoice cleanly, track what's outstanding, and accept payments online, Zoho Invoice handles all of that at zero cost.

It also integrates directly with Zoho Books if you outgrow it, so your data isn't stranded.

Best for: Service businesses and sole traders whose primary need is professional invoicing and getting paid — not full accounting.

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Situation	Recommended tool
Under $50k revenue, need proper books + BAS	Zoho Books Free
Simple needs, very low transaction volume	Wave Starter
Mainly need invoicing, no revenue cap concern	Zoho Invoice
Already using Zoho CRM or other Zoho apps	Zoho Books or Zoho Invoice (native integration)

Free tiers work until one of these points:

The upgrade path from Zoho Books to a paid plan is smooth. Moving from Wave to Xero mid-year can be clunky — worth factoring in if you're likely to outgrow it within 12 months.

Once you're GST-registered, have staff, and are making meaningful revenue, the paid stack pays for itself:

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Job	Tool	Approx. AUD/month
Accounting + BAS + Payroll	Xero Standard	~$70
Cashflow forecasting	Futrli or Fathom or custom Google/Excel sheet	~$40–60 (don't underestimate a good ol' free Google Sheet or Excel though - cashflow forecasts often are best on a plain spreadsheet)
Total		~$135–155/month

At this level, your accountant can work efficiently with your data, BAS prep is largely automated, and you have proper forward visibility on cashflow.

Xero (~$70/month Standard) is the gold standard for Australian small business accounting — proper ATO integration, STP-compliant payroll, strong bank feeds, and the platform most Australian accountants use natively.

MYOB (~$27/month Lite) is the alternative if your accountant specifically prefers it or you're in an industry where MYOB is dominant. Similar compliance features; clunkier interface.

Payroll is one area where going truly free becomes difficult in Australia, because STP lodgement is legally required once you have employees.

Xero Payroll is included in Standard and above — the cleanest STP-compliant solution for most Australian small businesses.

Outsource it: Some accountants run payroll as a managed service. If you only have one to three staff, outsourcing payroll for $50–100/month all-in is often cleaner than managing software yourself.

Cashflow forecasting is the most underused finance tool in small business. Most owners know their current bank balance but have limited visibility on where it's heading — and that's where businesses get into trouble.

A profitable business can still run out of cash. Usually it's timing mismatches between when you invoice and when you get paid, or a big obligation (tax, super, equipment) that hits when the account is already low.

A cashflow forecast is a projection of your bank account balance over a future period — typically 13 weeks, 6 months, or 12 months. It tracks:

The goal is to see problems before they arrive.

A well-structured spreadsheet is the most practical cashflow forecasting tool for most small businesses. The setup takes a few hours but runs itself after that.

Basic structure:

• Columns = time periods (weekly across the top for 0–13 weeks; monthly for longer horizons)
• Rows = line items: each major inflow category, each major outflow category, then opening balance and closing balance at the bottom

Roll that forward period by period and you have a forecast.

If you're on Xero, the Short-Term Cash Flow tool (under the Business menu) gives you a 30-day, 90-day or 180 day rolling forecast pulling in your actual bank balance, outstanding invoices, and upcoming bills automatically. It's not deep forecasting, but it's a useful daily sanity check and costs nothing extra on your existing Xero plan.

For anything beyond that, you'll need either a spreadsheet or a dedicated tool.

For businesses where cashflow is genuinely complex — project-based billing, high seasonality, significant debt obligations, or multiple entities — purpose-built forecasting tools are worth the investment. Every single forecast tool takes dedication & effort to run - it isn't set & forget, and if you're looking for that - hire a CFO who'll do it for you!! There is no such thing as a cashflow forecast that runs itself. 

Excel forecast tool  - Free, and just requires the building. Every business is different; construction projects differ greatly from stock businesses for example. Simply grab the pile of bills and start entering them into their relevant rows/columns on the spreadsheet.. there are templates about but best way is just to start and over time you become better at it.

Futrli (~$55/month AUD) Futrli connects to Xero or MYOB and builds a three-way forecast (P&L, balance sheet, cashflow) with scenario modelling. You can build a base case, a downside case, and a growth case and toggle between them. Strong for service businesses and project-based work. Designed to be owner-operated.

Fathom (~$65/month AUD) Fathom is widely used in the Australian SME market. Strong visualisation and KPI tracking alongside cashflow. Works well if you're running the numbers alongside an accountant or bookkeeper.

Spotlight Reporting (~$50–80/month AUD) Spotlight is the advisor-collaboration platform — better suited to businesses with an accountant or bookkeeper actively managing the numbers with you, rather than a solo operator running it themselves.

All three connect to Xero natively. The main differentiator is whether you're driving the forecast yourself (Futrli) or working with an advisor (Spotlight, Fathom).

Once you have a working forecast, you're looking for three things:

1. The low-water mark What's the lowest your bank balance gets in the forecast period, and when? If it goes negative — or uncomfortably close to zero — you know in advance and can act: defer an expense, chase a debtor early, arrange a short-term facility.

2. Timing mismatches You might be profitable but consistently cash-tight in the last week of the month. A forecast surfaces this pattern. The fix might be as simple as changing your invoice terms or staggering supplier payments.

3. ATO and super timing Quarterly super, quarterly GST, PAYG withholding, and annual tax instalments can all hit in the same period. Map these into your forecast explicitly and set aside the equivalent amount monthly — treat it like a fixed expense.

Run two versions: a base case (expected payment timing) and a delayed case (assume your top two or three debtors pay two weeks late). The gap between those two scenarios tells you how exposed you are to debtor timing risk. If the delayed case pushes you into trouble, your debtor terms or credit management need attention before your software does.

Start with Zoho Books Free if you're under $50k revenue — it's the strongest free accounting option available to Australian businesses right now. Use Zoho Invoice if invoicing is your primary need and you want no revenue cap. Fall back to Wave Starter if you have very simple needs and want the most minimal setup possible, with eyes open on its recent limitations.

Move to Xero once you're GST-registered with regular transaction volume — the compliance benefits and accountant compatibility justify the ~$70/month.

For cashflow forecasting, start with a Google Sheet. Add Futrli or Fathom when you're ready for three-way forecasting and scenario modelling.. or simply keep on with the spreadsheets - it's amazing what they can do. 

The goal isn't the most sophisticated stack — it's clean books, no compliance surprises, and enough forward visibility to make good decisions.