Bonus shares, returns of capital, and share consolidations: the "minor" corporate actions that trip up retiree cost bases

Beyond the headline corporate events — takeovers, demergers, capital raisings — retiree share investors regularly meet a set of "minor" corporate actions that quietly change their holdings and their capital gains tax (CGT) cost base, and that are commonly mishandled. Three recur. A bonus share issue gives existing shareholders extra free shares in proportion to their holding. A return of capital hands surplus capital back to shareholders as a cash distribution that is not a dividend. And a share consolidation or split reduces or increases the number of shares on issue, changing the share count and per-share price without changing the total value. Each has a specific, non-obvious CGT treatment, and getting it wrong distorts the eventual gain when the shares are sold. In short: bonus shares generally don't trigger a CGT event on receipt but spread the original cost base across the larger number of shares; a return of capital is generally not assessable income but reduces the cost base; and a consolidation or split generally isn't a CGT event at all. The two classic errors — treating bonus shares as having a nil cost base, and treating a return of capital as simply tax-free with no cost-base effect — are common and costly. For long-held parcels that have been through years of these events, accurate cost-base tracking is essential, and the specifics of any one event are set out in the company's notice and the relevant ATO advice or class ruling.

What are these three corporate actions?

It pays to keep them distinct because their effects differ. A bonus share issue is when the company issues additional shares free to existing shareholders in proportion to their holding — say one bonus share for every ten held — and the shareholder pays nothing. A return of capital is a cash payment characterised as a return of capital rather than a dividend, typically where the company has surplus capital it doesn't need and chooses to hand it back. A consolidation (sometimes a reverse split) reduces the number of shares on issue and lifts the per-share price proportionally, while a split increases the number and lowers the per-share price — in both cases without changing the total value of the holding. They look superficially alike, since your share count changes, but their CGT consequences are quite different.

Why is the "nil cost base" error on bonus shares so common?

Receiving bonus shares generally is not a CGT event — no gain or loss arises on issue. Instead, the cost base of the bonus shares is worked out by apportioning the cost base of the original shares over both the original and the bonus shares. So if you held 1,000 shares with a $10,000 cost base and received 100 bonus shares, that $10,000 now spreads across 1,100 shares — about $9.09 each — rather than the bonus shares having a separate cost base of their own. The bonus shares are also taken to have been acquired when you acquired the original shares, which preserves the 12-month holding for the 50% discount and any pre-CGT status. The one wrinkle is where part of a bonus issue is paid as a dividend (out of profits and partly assessable), in which case that part is taxed and the relevant shares take their own cost base and date — so the company's notice is worth checking. The classic error is treating the bonus shares as having a nil cost base, as if they were pure profit, which overstates the gain and the tax on a later sale. They aren't cost-base-free; they share the original parcel's cost base.

Why is a return of capital not simply tax-free?

A genuine return of capital is generally not assessable income — it isn't a dividend, so it isn't taxed as income in the year received. But it is not simply free money. It is a non-assessable payment, and the ATO's CGT events table is explicit that this is CGT event G1, "Capital payment for shares": the gain is the payment minus the cost base of the shares, with no capital loss available. In practice that means the return of capital reduces the cost base of the shares by the amount returned, deferring the tax effect until you eventually sell — a lower cost base producing a larger eventual gain. And if the return of capital exceeds the remaining cost base (a real risk on low-cost or pre-CGT holdings), the excess is an immediate capital gain in the year received rather than a deferral. There's an anti-avoidance dimension too: the ATO scrutinises returns of capital that are really disguised dividends (under the streaming and capital-benefit provisions in sections 45A, 45B and 45C) and can treat part as an unfranked dividend. The classic error is pocketing the cash as tax-free and forgetting to reduce the cost base, which overstates the cost base and understates the gain on sale, inviting an ATO adjustment.

Do consolidations and splits trigger any CGT?

A consolidation or split is the most harmless of the three. The ATO's position is that no CGT event happens as a result of a consolidation, and the total of the cost bases of the shares held immediately before becomes the total of the cost bases of the corresponding shares immediately after. The total cost base stays the same, just spread across a different number of shares: a consolidation (fewer shares) means a higher per-share cost base, a split (more shares) a lower one. The shares keep their original acquisition date. Economically it is just a re-denomination — like swapping a $100 note for five $20s; the value is identical and only the units differ. So while your holding statement looks different afterward, there is no tax event and no change to the total cost base, only a recalculation of the per-share figure.

How does a DRP differ from a bonus issue?

A dividend reinvestment plan (DRP) is constantly mistaken for a bonus issue, and the treatment is the opposite. Under a DRP the dividend is assessable income, taxed as a dividend, and the reinvested amount buys new shares — so DRP shares have a cost base equal to the dividend reinvested and their own acquisition date, the date of reinvestment. That is fundamentally different from bonus shares, which are free, share the original parcel's cost base, and inherit its acquisition date. Confusing the two breeds errors in both directions: treating DRP shares as if they shared the original cost base (wrong — they have their own from the reinvested dividend), or treating bonus shares as a taxable dividend reinvestment (wrong — they aren't assessable income). "Free-looking extra shares" might be either, and the treatment turns on which.

Why does tracking all of this actually matter?

All of this feeds the eventual gain. When the shares are finally sold — by the retiree or their estate — the capital gain is the proceeds less the cost base, and every one of these events has adjusted that cost base along the way. The errors compound: a decades-held blue-chip parcel may have been through multiple bonus issues, a return of capital or two, a consolidation, and years of DRP participation, each nudging the cost base. Get any of them wrong and the calculated gain is wrong — either overstated, so the retiree pays too much tax, or understated, risking an ATO adjustment with interest. On a long-held parcel sitting on a big gain, the dollars at stake in getting the cost base right are real. The practical follow-through is to keep each company notice and any ATO ruling, update the recorded cost base after every event (spread it for bonus shares, reduce it for returns of capital, re-spread the same total after a consolidation), and, where records are incomplete before a sale, reconstruct the history from company announcements and the ATO rulings rather than scrambling at tax time. For Centrelink, bonus shares and consolidations are broadly value-neutral and picked up at the next revaluation, while a return of capital puts assessable cash in hand with the share value falling correspondingly, and should be reported like any holdings change.

Worked examples

These two cases show the treatments in action. They are illustrative only and not personal advice.

Patricia, 72, is selling 2,200 shares she has held for 20 years. Her records show she originally bought 2,000 shares for $16,000, and that the company later made a one-for-ten bonus issue, giving her 200 bonus shares and taking her to 2,200; she isn't sure what cost base to use for the 200. On these facts the key is that the bonus shares are not nil cost base. The original $16,000 spreads across all 2,200 shares — about $7.27 each — rather than $8 on the original 2,000 and $0 on the bonus 200, so the whole parcel's cost base remains $16,000 (assuming a straightforward bonus issue with no dividend element). The bonus shares also carry her 20-year-old acquisition date, so the whole parcel qualifies for the 50% discount. On these facts the rational approach is to use the spread $16,000 across 2,200 shares rather than a nil cost base for the bonus shares — which would otherwise overstate her gain by treating them as pure profit — after checking the original bonus-issue notice to confirm there was no dividend element.

Geoffrey, 75, received a $3,000 "return of capital" from a company he holds and was pleased it wasn't taxed as a dividend; he is now selling the shares and assumes the $3,000 had no tax consequence at all. On these facts that assumption is the classic error. The $3,000 wasn't assessable income, but under CGT event G1 it reduced the cost base of his shares by $3,000, so the gain on sale must be worked out on the original cost base minus the $3,000. If his accountant uses the un-reduced cost base, the gain is understated by $3,000 and exposed to an ATO adjustment — and had the $3,000 exceeded his remaining cost base, the excess would already have been a capital gain in the year he received it. On these facts the rational step is to ensure the cost base used for the sale reflects the $3,000 reduction, and to check the company's return-of-capital notice or ATO ruling to confirm the treatment and that it wasn't recharacterised as a disguised dividend. The return of capital was tax-deferred, not tax-free, and the deferral comes home at sale.

For retiree share investors, these "minor" corporate actions are easy to overlook but important to get right, because each adjusts the cost base that determines the eventual gain. The work is to identify the event type correctly, apply the right treatment — spread the cost base for bonus shares, reduce it for returns of capital, re-spread the same total for consolidations and splits, and treat DRP shares as separate purchases — avoid the two classic errors, reference the company notice and any ATO ruling, keep or reconstruct accurate records, and report holdings changes to Centrelink. None of these events is dramatic in the moment, but each leaves a footprint on the cost base, and over a long holding those footprints accumulate. The person who eventually sells will only get the gain right if the cost base has been tracked correctly through every one of them.

Sources

• ATO — CGT events (CGT event G1, capital payment for shares)
• ATO — Shares and similar investments (CGT)
• ATO — Cost base of assets