How to avoid capital gains tax on shares in australia: time sales after 12 months for the 50% CGT discount, offset gains with crystallised losses before 30 June, and hold investments to defer unrealised gains — the ATO only taxes realised gains.
How can you avoid capital gains tax on shares in Australia?
The ATO taxes you on what you realise, not what you hold. That single fact shapes every smart decision an Australian share investor makes before 30 June.
With the end of the financial year approaching, you have a narrow window to reduce your tax bill. The tips below cover the areas that make the biggest difference — from CGT timing to franking credits, super contributions and ETF record-keeping.
What is the ATO capital gains tax discount for shares held 12 months?
Unrealised vs realised capital gains
An unrealised gain is the increase in value of shares you still hold. The ATO does not tax it. A realised gain occurs when you sell, triggering a CGT event. Until you sell, you control when tax applies.
Review your portfolio before 30 June
Log into your broker or portfolio tracker and pull your realised transactions for the financial year. Note any sales already made, then look at remaining holdings to decide whether to act before 30 June or wait until the next financial year.
Timing example
You hold shares worth $18,000 with a cost base of $10,000. Sell before 30 June and the $8,000 gain falls in this financial year. Wait until 1 July and it falls in the next. Timing the sale lets you match the gain against losses or lower income in the year that suits you best.
What records should you keep for CGT on shares?
How the 50% CGT discount works
Individuals and trusts who hold ASX shares or ETFs for at least 12 months before selling are eligible for a 50% CGT discount. Only half the capital gain is added to your taxable income. Companies and super funds in accumulation phase do not receive this discount.
Why acquisition date matters more than purchase price
Check the purchase date before you sell any parcel. A parcel bought on 15 June last year becomes discount-eligible on 16 June this year. Selling one day too early costs you the discount on the full gain.
Worked example
You sell shares for a $20,000 gain. At 11 months, the full $20,000 is assessable. At a 37% marginal rate, that’s $7,400 in tax. At 13 months with the 50% discount, only $10,000 is assessable — tax drops to $3,700. Waiting two months saves $3,700.
How to calculate capital gains tax on Australian shares?
What tax-loss selling is
Tax-loss selling means selling holdings currently at a loss to crystallise that loss before 30 June. The realised loss then offsets capital gains already made this financial year, reducing your net CGT liability.
Carry-forward rules
Capital losses must first offset capital gains in the same financial year. If losses exceed gains, the net capital loss carries forward to future years and never expires.
The wash-sale risk
The ATO applies general anti-avoidance provisions to arrangements it considers artificial. Selling shares purely to crystallise a loss, then immediately rebuying the same shares with no genuine change in investment position, risks the ATO disallowing the loss. A genuine investment review should drive the decision.
Tip 4: Make the Most of Franking Credits From ASX Dividends
How dividend imputation works
When an ASX company pays a fully franked dividend, it attaches a franking credit representing the 30% company tax already paid. You include both the dividend and the credit in your taxable income, then use the credit to offset your tax payable.
Refunds versus reductions
If your marginal tax rate is below 30%, your franking credits exceed your tax liability on that income and the ATO refunds the difference in cash. If your marginal rate is above 30%, the credit reduces — but does not eliminate — your tax on the dividend.
Who benefits most
Low-income earners and retirees with taxable income below the 19% threshold benefit most, receiving a cash refund. Super funds in pension phase (0% tax) receive franking credits as a full refund. High-income earners still benefit, but the credit only partially offsets their 45% marginal rate.
Tip 5: Top Up Super Before 30 June to Reduce Taxable Income
Concessional contributions and the personal deductible contribution pathway
The concessional contribution cap is $30,000 for the current financial year, including employer super guarantee payments and salary sacrifice. You can also make a personal deductible contribution — pay money into super from your bank account, then lodge a Notice of Intent to Claim a Deduction with your fund before you lodge your tax return.
Carry-forward rule for balances below $500,000
If your total super balance was below $500,000 at 30 June of the previous financial year, you may access unused concessional cap amounts from prior years going back to 2018–19. Note that any unused cap from 2020–21 expires at the end of the 2025–26 financial year.
Key deadline
Your super fund must receive the contribution by 30 June for it to count this financial year. Allow at least three to five business days for processing.
Tip 6: Prepay Deductible Investment Expenses Before the Year Closes
What is deductible
Expenses incurred in earning assessable investment income are generally deductible. This includes interest on margin loans, portfolio administration fees, and accounting fees related to your share portfolio.
The 12-month prepayment rule
Individuals can prepay up to 12 months of investment loan interest before 30 June and claim the full deduction in this financial year. Your lender must agree. This brings a future deduction forward — useful if your taxable income is higher this year than expected next year.
Other costs to note
Brokerage fees on share purchases are not immediately deductible — they form part of your cost base and reduce your capital gain on sale. Ongoing portfolio management fees and eligible investing subscriptions are deductible in the year incurred. Keep receipts for all amounts.
Tip 7: Get Your ETF Cost Base Right — The AMIT Trap
How AMIT tax statements adjust cost base
ETFs operating under the Attribution Managed Investment Trust (AMIT) regime issue an annual tax statement that includes a cost base adjustment. This increases or decreases your cost base in the ETF units. Ignoring it means your CGT calculation at sale is wrong — often resulting in overpaying or underpaying tax.
DRP shares and corporate actions
When you participate in a dividend reinvestment plan (DRP), new shares are issued at market price on the reinvestment date. Each parcel has its own cost base and acquisition date. Rights issues, share splits and spin-offs also create separate CGT events. Many investors miss these entirely.
Accurate records reduce errors
The ATO expects CGT calculations using accurate cost base figures, including all AMIT adjustments and corporate actions. Tools like Crowdfolio are built for Australian DIY investors and help track ETF cost base adjustments, DRP parcels and trade history in one place.
Record-Keeping: What the ATO Expects
The ATO requires you to keep records for five years from the date you lodge your tax return for the year a CGT event occurs. Required documents include trade confirmations, dividend statements, DRP records and ETF annual tax statements.
Every time you buy or sell shares, your broker issues a contract note — the primary document for establishing cost base and acquisition date.
If records are missing due to broker closures, contact the broker directly and request historical statements. Share registries such as Computershare and Link Market Services also hold some historical data. Document your attempts to reconstruct records in case the ATO requests them.
When do you need to pay capital gains tax on shares?
Q: Do capital losses carry forward if unused?
Yes. Net capital losses carry forward indefinitely and offset capital gains in future financial years. They do not offset other income such as salary or dividends.
Q: Does the 50% CGT discount apply to ETFs?
Yes. The discount applies to ETF units held by individuals and trusts for at least 12 months, the same as direct ASX shares. AMIT cost base adjustments affect the gain calculation before the discount is applied.
Q: How do I claim a deduction for a personal super contribution?
Lodge a Notice of Intent to Claim a Deduction with your super fund before you lodge your tax return. Your fund must acknowledge the notice. The deductible amount is then reported in your tax return.
Q: Are brokerage fees tax-deductible?
No. Brokerage paid on purchase is added to your cost base. Brokerage paid on sale reduces your capital proceeds. Both affect your CGT calculation at the time of sale, not as an immediate deduction.