When discounted cash flow is the right valuation method.

Discounted cash flow (DCF) values a business by forecasting its free cash flows over an explicit period — usually three to five years — adding a terminal value for everything beyond it, and discounting both to present value at a build-up rate (risk-free rate + equity risk premium + specific-company risk premium). For an Australian SME, DCF suits businesses with strong, forecastable growth — SaaS, infrastructure, proven roll-outs — but is unreliable for volatile or early-stage businesses, where capitalisation of future maintainable earnings is usually more defensible. The ATO and reviewers reject DCF valuations built on unsupported forecasts.

When DCF fits an Australian SME — and when it does not

DCF and capitalisation of future maintainable earnings (FME) both convert future profit into a present value, but they make opposite assumptions. FME assumes the future looks broadly like a normalised past, which suits established, stable, profitable businesses — and that describes most Australian SMEs. DCF makes no such assumption: it forecasts each year's cash flow explicitly, so it fits businesses whose near-term trajectory is expected to differ materially and predictably from history. The good candidates share one trait — the growth is both material and evidenced. A SaaS business with contracted recurring revenue and observable cohort retention; an infrastructure or asset-backed operation with long-dated contracted cash flows; a multi-site roll-out where the unit economics are proven and the expansion schedule is committed. You can point to signed contracts, a proven unit model, or a committed build. DCF is unreliable for the opposite case: volatile earnings with no discernible pattern, or early-stage and pre-profit businesses whose forecasts are aspiration rather than evidence. There, small changes in the assumptions swing the answer wildly, and the ATO and reviewers discount the result — capitalisation of maintainable earnings, or net assets, is the more defensible method. Choosing DCF because it produces a higher number, when the forecasts cannot be supported, is the single most common way a DCF valuation fails on review.

The three moving parts of a DCF

A DCF has three components, and the concluded value is only as reliable as the weakest of them. Each carries judgement, and a report that shows the working on all three is far harder to challenge than one that presents a single output figure.

• ·Explicit forecast period — a year-by-year projection of free cash flow, usually three to five years for an SME (longer for infrastructure or long-dated contracts), run out until the business reaches a steady, sustainable growth rate.
• ·Terminal value — a single figure capturing all cash flows beyond the explicit period, calculated either by the Gordon growth (perpetuity) formula or an exit multiple, then discounted back to present value like any other future amount.
• ·Discount rate — the rate that converts future dollars into today's dollars, built up from a risk-free rate, an equity risk premium and a specific-company risk premium, and matched to the cash flow definition (cost of equity for equity cash flows, WACC for whole-of-firm cash flows).

Building the discount rate: risk-free rate + equity risk premium + specific-company risk

The discount rate is where a DCF is most often quietly wrong, because a two-point change in the rate can move the concluded value more than any argument about the forecasts themselves. For Australian SMEs the rate is built up, not read off a listed market. The risk-free rate is the yield on long-dated Australian Commonwealth Government bonds at the valuation date — sourced to the date, not an assumed round figure. The equity risk premium (also called the market risk premium) is the additional return investors require for holding diversified equities over the risk-free asset, drawn from published Australian market studies rather than asserted. The specific-company risk premium is a reasoned loading for size, customer concentration, key-person dependency, competitive position — and, critically for a DCF, the reliability of the forecasts themselves: a forecast-heavy business carries a forecast risk that a mature earnings stream does not, and the rate should reflect it. The result must then be matched to the cash flows — a cost-of-equity rate applied to free cash flow to equity, or a weighted average cost of capital (WACC) applied to free cash flow to the firm; mixing the two produces a systematic bias in one direction. Our discount-rates and capitalisation-rates resource sets out the full build component by component. A DCF that asserts, say, an 18% rate without showing the build is asserting the answer, not supporting it.

The terminal value problem — where most of the value hides

In a typical SME DCF the terminal value is not a footnote — it is frequently 60% to 80% of the total present value, because the explicit forecast covers only the first few years and everything after is compressed into that one figure. That makes the terminal value assumptions the most sensitive numbers in the model. There are two methods: the Gordon growth (perpetuity) approach — terminal value = final-year free cash flow × (1 + g) ÷ (discount rate − g) — and an exit multiple applied to a terminal-year earnings figure. The perpetual growth rate g is the dangerous input: because it sits in the denominator (r − g), a move from 2.5% to 3.5% lifts the terminal value materially, and a g anywhere near the discount rate makes the value explode. The discipline is that g cannot exceed the long-run nominal growth rate of the economy — no business grows faster than the economy forever — so a terminal growth rate above roughly long-run GDP plus inflation is a red flag, and an exit-multiple terminal value should be cross-checked against what a real purchaser would actually pay. Illustrative only (generic figures, not a recommendation): a business with a $1,000,000 terminal-year free cash flow, a 15% discount rate and 3% perpetual growth has a terminal value of $1,000,000 × 1.03 ÷ (0.15 − 0.03), or about $8.58m before discounting back — and nudging g to 5% lifts it to about $10.5m, a 22% jump from a single assumption. A report that does not run a sensitivity table across the terminal value inputs is hiding where the answer actually comes from.

Why the ATO and reviewers reject DCF forecasts

The ATO's market valuation for tax purposes guidance does not prefer one method — it asks whether the valuation is objective, uses a recognised methodology appropriate to the asset, and rests on reasonable and supportable assumptions, all documented. DCF fails that test more often than any other method, because its answer is built almost entirely on forecasts, and forecasts are easy to inflate and hard to prove. The features that separate a supportable DCF from a rejected one are consistent.

• ·Contemporaneous evidence — forecasts supported by signed contracts, a documented pipeline, proven cohort retention or a committed build schedule, not a spreadsheet of optimistic assumptions prepared to justify the valuation.
• ·Consistency with history and budgets — a forecast that bears no relationship to the entity's actual track record, or to the budgets the directors were using before the valuation was commissioned, invites the obvious question.
• ·No hindsight — a market valuation, and especially a retrospective one, must use only information available at the valuation date; importing later knowledge of how things turned out is a defect the ATO specifically warns against.
• ·A reasoned discount rate and terminal value — the two inputs that do most of the work, each built up and sensitivity-tested rather than asserted as a single figure.

How our fixed fee scales with DCF complexity

A DCF is more work than a single-multiple capitalisation — more inputs to evidence, more sensitivity to test — so the engagement tier is chosen to match. For a straightforward, single-entity DCF where the forecasts are well-supported and the rate is not expected to be contested, the Comprehensive engagement (from $3,995 + GST, 15–25 business days) is usually the right level: an explicit forecast model, a documented discount-rate build, a terminal value with a sensitivity table, and a second methodology as cross-check, senior-reviewer signed. Where the DCF is likely to be reviewed or disputed — a material CGT position, a related-party transaction, or a business whose forecasts a reviewer will press hard — the Defensible Valuation File (from $8,995 + GST, 25–35 business days) adds the full evidence pack behind every forecast assumption and a deeper sensitivity analysis. Where the question is how value moves across several forecast, rate and terminal-growth scenarios — before a raise, a board decision or a negotiation — the Valuation Range & Scenario Review (from $12,995 + GST, 30–45 business days) models those scenarios explicitly, which is where a DCF earns its keep. The Essential engagement (from $1,495 + GST) is built for straightforward single-multiple matters and is generally not the right fit for a genuine DCF; where you only need a directional figure, an Indicative Snapshot (from $990) is available, though it is not a formal valuation report. Retrospective valuation dates add $495 per historical date — relevant to a DCF because both the risk-free rate and the forecasts must be sourced to that date, with no hindsight — additional entities are $750 each, and urgent matters can be accelerated at +30% of the base fee, subject to capacity. Our fees are fixed at engagement and never contingent on the value concluded, and we pay no referral fees or commissions to accountants who refer work — both because independence is the point of a valuation that has to withstand review. One boundary worth stating plainly: Oliver Group prepares the independent valuation to IVS 104 and APES 225, consistent with the ATO's guidance — we are not a registered tax agent and do not provide tax advice; how the valuation is applied to a tax position is a matter for your accountant.