When your shares get taken over: cash, scrip, and the rollover decision for retiree investors

If you hold shares directly, one event tends to arrive without warning: a company you own is acquired in a takeover or merger. A long-held parcel of bank shares, mining stock, or blue chips — perhaps bought decades ago at a fraction of today's price — suddenly becomes the subject of an offer, and you face both a capital gains tax (CGT) event and a decision you didn't ask to make. The acquirer usually offers cash, scrip (shares in the acquiring company), or a mix, and each carries different CGT consequences. A cash takeover crystallises the gain now. A scrip-for-scrip takeover may qualify for rollover relief that defers the gain, with the new shares taking on the old cost base. A mixed offer usually means a partial gain on the cash and rollover on the scrip. For a retiree sitting on a large latent gain, a takeover can land a sizeable taxable gain in a single year — touching not just the tax bill but Commonwealth Seniors Health Card (CSHC) eligibility and the Age Pension assessment. Knowing the consequences of each structure, and the often-missed choice of whether to take the rollover or deliberately crystallise, is what makes the difference under the time pressure these deals impose.

Is a takeover always a CGT event?

When your shares are acquired in a takeover — whether by a scheme of arrangement that shareholders vote on, or by a takeover bid — you dispose of those shares, and that disposal is a CGT event. The capital proceeds are the value of what you receive: the cash, the market value of the scrip, or both. Your gain (or loss) is those proceeds less your cost base, and on long-held appreciated shares the gain is often large. The timing is generally out of your hands: once the deal completes, the CGT event falls in that income year. You cannot defer it simply by choosing not to sell — if the takeover succeeds, the disposal happens regardless.

What happens with a cash takeover?

Where the acquirer pays cash, you receive the cash, dispose of the shares, and crystallise the full gain in the year of completion. Cash consideration does not qualify for scrip-for-scrip rollover, so there is no deferral option — though where the shares were held 12 months or more, the 50% CGT discount applies for individuals. The exposure is real: a parcel of bank shares bought in the 1990s at, say, $8 and taken over at $30 produces a $22-per-share gain, and across several thousand shares that is a large gain arriving in one tax year, capable of lifting you into higher marginal brackets and disturbing your concession-card position. You didn't choose to sell — the takeover forced it.

How does scrip-for-scrip rollover defer the gain?

Where the consideration is shares in the acquirer and the conditions of Subdivision 124-M of the income tax law are met, you can choose scrip-for-scrip rollover. The effect is deferral, not elimination: the ATO explains that the rollover lets you disregard the capital gain on the original shares, and you are taken to have acquired the replacement shares for the cost base of the original ones — so the gain rides along inside the new holding until you eventually sell. The rollover is only available where the arrangement results in the acquirer becoming the owner of 80% or more of the target, and it applies only to a capital gain — not a capital loss, which is simply realised. Two points catch long-term holders: shares acquired before 20 September 1985 (pre-CGT) are not eligible for the rollover, and the rollover is a choice you make, so you can decline it where crystallising the gain is actually the better move. That election is the decision most often mishandled.

What about a mixed cash-and-scrip offer?

Most offers combine cash and scrip — say "$10 cash plus 0.4 acquirer shares for each share." Rollover is available only on the scrip portion; the cash portion crystallises a proportionate gain. As the ATO sets out, you apportion the cost base of the original shares between the replacement shares and the cash, based on their relative values, and the gain attributable to the cash is taxable now while the gain on the scrip is deferred if you elect rollover. So a mixed offer typically gives a hybrid result — part taxed now, part deferred — that needs careful calculation rather than a single instinct.

When should you decline rollover and crystallise instead?

The reflex is "defer the gain — rollover is good," and often it is. But deliberately crystallising (declining rollover) can be the better choice. The strongest case is carried-forward capital losses: declining rollover lets those losses offset the takeover gain, putting to use losses that would otherwise be wasted — and because carried-forward losses are extinguished at death and can't be inherited, this matters most for older retirees (see the companion article on how capital losses die with you). Crystallising can also suit a low-tax year, a wish to reset the cost base higher, or a situation where you don't want to hold the acquirer's shares and would sell within weeks anyway — in which case rolling over just adds complexity before an inevitable sale. Conversely, electing rollover makes sense where you want to keep the investment, where crystallising would push you into high brackets, or where a large realised gain would breach the CSHC income test.

How can a takeover affect the Commonwealth Seniors Health Card?

The CSHC is the concession card for self-funded retirees over Age Pension age, and its income test is based on adjusted taxable income plus deemed income from any account-based income streams. A large crystallised capital gain — from a cash takeover or a decision not to roll over — inflates your taxable income for that year and can push you over the income limit, which is $101,105 a year for a single person and $161,768 combined for a couple (as at 20 September 2025). Losing the card costs its valuable concessions on pharmaceuticals and other benefits for a period. For a self-funded retiree who relies on the CSHC, the income-test impact should be modelled before deciding — and electing rollover, where available, sidesteps the hit by deferring the gain entirely. Here the social-security consequence, not just the tax, can drive the decision.

Can I just refuse to sell my shares?

Holding out is not a real escape. Under the Corporations Act 2001, once a bidder reaches a relevant interest in 90% of the shares it bid for, it can compulsorily acquire the rest. That compulsory acquisition still triggers the CGT event, so a shareholder who declined the offer is forced to dispose anyway, with the same treatment — cash crystallises, scrip may roll over. "I'll just hold and not accept" is therefore not a strategy once the bid succeeds; the only genuine choices are around timing and the rollover election, not whether the disposal happens.

What records should you keep after a rollover?

After scrip-for-scrip rollover, the new shares carry the cost base of the old ones, so the deferred gain stays embedded in the new holding and is taxed when those shares are eventually sold. Where you held several parcels of the target bought at different times and prices, the rollover preserves that parcel-by-parcel cost base in the new shares — which matters for future disposal sums, sometimes decades later. Most significant takeovers come with an ATO class ruling confirming the CGT treatment and rollover availability for that specific deal; it is the key reference for your tax return and is always worth obtaining.

Worked examples

These two cases show the decision in practice. They are illustrative only and not personal advice.

Raymond, 75, in declining health, holds 4,000 shares in a regional bank bought in 1996 at a $6 cost base ($24,000 in total). A larger bank bids scrip-for-scrip at an implied $28 a share (0.4 of its shares per target share), so his proceeds are about $112,000 and his embedded gain about $88,000. He also has $70,000 of carried-forward capital losses from the GFC sitting on his return. The instinctive move — take the rollover — would defer the gain but leave those losses unused, and they would die with him. On these facts the rational course is generally the opposite: decline rollover, crystallise the $88,000 gain, and offset it with the $70,000 of losses (which apply against the gross gain before the 50% discount), leaving only a small taxable amount. The losses are put to work instead of wasted, and his new acquirer shares take a fresh, higher cost base that benefits his beneficiaries. The arithmetic should be modelled precisely, including the CSHC impact of the residual gain after losses.

Diana, 68, a self-funded retiree on the CSHC, holds 3,000 shares in a miner at a $5 cost base ($15,000), now under a scrip-for-scrip bid valued at $20 a share — an embedded gain of about $45,000. She has no carried-forward losses, wants to stay invested, and relies on her card. On these facts electing rollover is generally rational. With no losses to use and a wish to keep the investment, the decisive factor is that crystallising a $45,000 gain (around $22,500 after the discount) could lift her adjusted taxable income over the $101,105 single CSHC limit and cost her the card. Electing scrip-for-scrip rollover defers the whole gain — no income-test hit this year, card preserved, investment continued in the acquirer — with the deferred gain carried in the new shares' cost base for whenever she eventually sells. She should update her cost-base records, report the change of holdings to Centrelink, and keep the ATO class ruling.

For retiree share investors, a takeover is a recurring event that rewards prompt, considered thought over a default reaction. The work is to identify the offer structure, calculate the embedded gain against the original cost base, and model the rollover-versus-crystallise choice — weighing carried-forward losses, marginal rates, the CSHC and Age Pension tests, and whether you actually want to own the acquirer — then reference the deal's ATO class ruling, make (or decline) the election correctly on the return, update cost-base and parcel records, and tell Centrelink about the change. Deferring via rollover is the right answer more often than not, but the cases where crystallising wins — carried-forward losses, low-tax years, an intention to sell anyway — are exactly where good thinking adds the most, and the CSHC trap is the one most easily missed. The takeover isn't your choice; how you respond to it is.

Sources

• ATO — Scrip for scrip rollover
• Services Australia — Income test for the Commonwealth Seniors Health Card
• ASIC Regulatory Guide 10 — Compulsory acquisitions and buy-outs (90% threshold)