The Same Gain, Taxed at Whatever Your Year Looks Like
A capital gain is added to your assessable income in the year the sale contract is signed, so the rate it attracts is whatever your income that year produces. That makes a low-income year — the first year of retirement, a career break, a year between jobs — a genuine and time-limited opportunity to realise gains that have been accumulating for decades.
- The answer: The discounted gain stacks on your other income, so realising in a year with less of it produces a lower rate on the same gain.
- The trap: A large gain fills the brackets by itself. 'No other income' does not mean 'no tax' once the gain is substantial.
- The recommendation: Spread realisations across financial years where possible. Two years of brackets beats one, and the contract date is the lever.
Where the AI summary above gets this wrong
"Wait until you retire to sell your investments and you will pay no capital gains tax."
That's surface-true. Here's what it misses:
- The gain is income in its own right — A $300,000 gain discounted to $150,000 is $150,000 of assessable income, which reaches the higher brackets even with no salary behind it.
- Super pension payments do not shelter it — They are not assessable, which helps, but the gain is still assessed in full at the resident rates against whatever else is in the year.
01 Why the year matters
The discounted gain is added to your assessable income and taxed at your marginal rate. Someone earning $140,000 pays the top applicable rate on the whole gain; someone with no salary starts at the tax-free threshold and works up through the brackets.
In retirement, super pension payments after 60 are not assessable at all, which is what creates the low-income year in the first place. A household living on $70,000 of tax-free pension payments has a taxable income near zero before the gain.
The seniors and pensioners tax offset adds to the effect for someone of Age Pension age, though it shades out quickly and a substantial gain will exhaust it — the mechanics are in the SAPTO reference.
02 Spreading across years
Because each financial year has its own set of brackets, realising a large gain across two years uses two sets. For a gain large enough to reach the higher brackets, that is worth more than any other timing decision available.
The contract date is what allocates a sale to a year, so a listed portfolio can be sold in tranches on either side of 30 June with no difficulty. Property is harder, because it is one asset and one contract.
Joint ownership does the same thing mechanically. An asset held equally by two people produces two gains against two sets of brackets, which is why the ownership structure decided years earlier matters at the point of sale.
Shows: the tax on the same discounted gain in a working year and in a low-income year, using the marginal rates you supply for each. Ignores: the progressive scale within each year, which a large gain moves through, the Medicare levy, offsets, and any concessional contribution made in the year.
Source: ATO — Capital gains tax
03 What else to use the year for
A concessional contribution in the same year reduces assessable income directly, and unused carry-forward cap can make it much larger than the annual cap. That is the most effective single offset against a one-off gain.
Realising capital losses in the same year is the other. Losses are applied before the discount, so a loss realised in the year of a large gain is worth twice what it is worth carried forward against a discounted gain — the ordering is in the loss harvesting post.
And where the gain would push you over a threshold in an income test — the Commonwealth Seniors Health Card, the private health rebate, the Medicare levy surcharge — those consequences are worth checking before the contract rather than after.
The first year or two of retirement is the cheapest window most people ever get for realising gains, and it closes. Salary has stopped, the Age Pension has not started, and the portfolio is at its largest. If there are gains you have been deferring for twenty years, that is the year to deal with them.
FAQ
Should I realise capital gains in a low-income year to pay less capital gains tax?
Yes where you can choose the year. The discounted gain is added to your income and taxed at your marginal rate, so a year with less other income taxes the same gain considerably less.
Does a large gain still get taxed if I have no other income?
Yes. The gain is assessable income in its own right, so a large one fills the tax-free threshold and the lower brackets and reaches the higher rates by itself.
Can I spread a gain across two financial years?
For a listed portfolio, yes — sell in tranches on either side of 30 June, since the contract date allocates the sale to a year. A single property is one contract and cannot be split that way.
Sources
Regulator references
- ATO — Capital gains tax · Australian Taxation Office · 2026Capital gains tax: the events that trigger it and how the gain is worked out.Last verified: 2026-09-07
- ATO — Tax rates: Australian resident · Australian Taxation Office · 2026The resident marginal rate scale by income year, excluding the Medicare levy.Last verified: 2026-09-07
Calculator unit tests · the assertions this page's worked example is checked against, and their last result
Changelog
- 2026-09-07 — initial publish (new format)
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Jordan Reeves
Founder of Talk Through Wealth. A software engineer for over a decade before turning to retirement planning, Jordan built the projection engine after watching family members get fragmented, country-by-country advice that never reconciled. He writes about retirement the way the engine computes it: month-by-month, lifetime-long, and skeptical of any rule of thumb that hasn't been run through the math.