The spreadsheet you use to justify replacing your spreadsheets had better be convincing.
There’s an irony in measuring the ROI of tax software.
The people doing the calculation are the same people drowning in the manual process the software is supposed to fix. They’re building the business case in the margins of their day, between GL extractions and review cycles, using the very spreadsheets they’re trying to escape.
So let’s make this efficient. Here’s what actually matters when measuring ROI — and what’s a distraction.
If you want a quick starting point, TaxTime’s Value Protection ROI Calculator will give you an indicative estimate of your current compliance costs based on published academic research. It’s useful for getting the headline numbers. But this article is about what sits behind those numbers — the categories that matter, the costs that hide, and the value that doesn’t show up in a formula.
WHAT TO COUNT: THE OBVIOUS STUFF
Start with time. Not theoretical time — actual time. How many hours does your team spend, across the full return preparation cycle, from initial data extraction through to lodgment?
Be granular. Break it down by activity: data extraction and import, classification and coding, adjustments and overrides, internal review, external advisor review, rework from review comments, ATO query responses, and documentation.
Most teams underestimate this by 30-40% because they forget the rework cycles and the ad hoc queries that consume time throughout the year, not just at lodgment.
This isn’t just anecdotal. Evans, Lignier and Tran-Nam’s 2016 study of corporate tax compliance costs in large Australian companies found that total compliance costs are systematically higher than organisations estimate — and that a significant share of what gets classified as “external advisory” spend is, in practice, data processing work. If you’re building an ROI model, their research is worth referencing: it gives you an empirical baseline that’s harder to argue with than internal estimates alone.
Multiply by cost. Use fully loaded rates — salary plus super plus on-costs. A senior tax accountant in a major Australian corporate costs $180,000 to $250,000 per year when you factor everything in.
WHAT TO COUNT: THE STUFF PEOPLE FORGET
External advisor fees. How much do you pay your Big Four or mid-tier firm for return preparation support? More importantly, how much of that fee is for work that could be done internally if your team had the right tools?
Many corporates pay $100,000 to $300,000 per year for external tax compliance support that’s largely data processing dressed up as advisory. Purpose-built software doesn’t eliminate the need for external advice — but it dramatically reduces the commodity work you’re outsourcing at premium rates.
Error remediation. What did your last amended return cost? Not just the penalty and interest — the professional fees, the management time, the stress. If you’ve never had an error, what’s the probability-weighted cost of one occurring as your team relies on increasingly complex spreadsheets?
Key-person risk. If your senior tax manager left tomorrow, how long would it take to replace them? And could someone else actually use their spreadsheets? Most organisations have one person who “owns” the tax return process. That’s not a workflow — it’s a liability.
WHAT TO IGNORE
Ignore productivity claims that assume 100% time savings. Software doesn’t eliminate tax work — it shifts the work from data processing to review and judgement. Your team will still spend significant time on tax returns. They’ll just spend it on the right things.
Ignore feature comparisons that don’t map to your actual workflow. A system might have fifty configurable options. If you only need twelve, the other thirty-eight aren’t value — they’re complexity.
Ignore vendor projections that don’t include implementation costs and the first-year productivity dip. Any honest ROI calculation shows a J-curve: things get harder before they get easier.
WHAT GETS OVERLOOKED: THE STRATEGIC VALUE
Here’s what doesn’t fit neatly in a spreadsheet but matters enormously.
Speed of response. When the ATO asks for a reconciliation of your taxable income to your accounting profit, how long does it take today? If the answer is measured in weeks, that’s a Justified Trust red flag. If the answer is measured in minutes, that’s a governance win.
Team capability. When your tax people stop spending 70% of their time on data processing, what do they do with the freed capacity? Transfer pricing analysis. R&D claim optimisation. Proactive risk identification. These activities directly impact your effective tax rate — and they’re the reason you hired tax professionals in the first place.
Regulatory readiness. The ATO’s expectations of large taxpayers are increasing, not decreasing. Spreadsheet-based processes with no audit trail and no workflow controls are a growing liability. The cost of not being ready is hard to quantify today — but it’s real, and it’s rising.
THE REAL ROI
The real return on tax software isn’t in the hours saved. It’s in the transformation of your tax function from a cost centre that processes data to a strategic function that protects shareholder value.
That’s hard to put in a spreadsheet. But it’s the reason the investment makes sense.
Once you’ve mapped what to measure, the next step is packaging it into a document that gets signed. Our companion article — Building the Business Case for Tax Software — walks through the framework for presenting these numbers in a way that resonates with CFOs and boards.
