The 50% CGT discount: Australia's biggest RSU optimization (and how to use it)

You vested AUD 200,000 of US RSUs last year as an Australian tax resident. Default options: sell at vest (Division 83A income tax already paid, no further tax) or hold. If you hold and sell after 12 months and a day, you cut the capital gains tax on any appreciation in half. The 50% CGT discount is the single biggest tax-strategy lever available to Australian residents holding US stocks — but the decision is not as simple as "always hold 12 months."

The 30-second answer: Hold US RSU shares for more than 12 months after vest, and the capital gain on disposal is halved before being included in assessable income. For a top-bracket Australian (47% combined federal + Medicare), this drops the effective CGT rate from 47% to 23.5%. The 12-month clock starts vest day + 1; you must dispose more than 12 months later. The discount applies to any appreciation after vest. The original vest income (Division 83A) is unaffected. For high-conviction holdings, the discount is worth holding for. For concentration management, sell at vest regardless. This piece walks through the mechanics, worked examples, and the decision framework.

Reading this in the run-up to Australian Tax Time 2026? Australian financial year runs 1 July - 30 June. This piece is part of our Australia residents with US RSUs hub.

Why this matters for Australian RSU holders

For an Australian tax resident at the top marginal rate (45% income tax + 2% Medicare = 47% effective), the difference between selling US RSU shares at month 11 vs month 13 is a 50% reduction in CGT on the gain.

For a typical FAANG engineer in Sydney or Melbourne accumulating AUD 200K-AUD 500K of US RSU value per year, with 5-10 year horizons, the cumulative impact of correctly using the 50% discount can run into AUD 100K+ over a career.

But the discount is conditional. It requires:

1. Australian tax residency at the time of disposal
2. Asset held for >12 months from acquisition (vest date) to disposal
3. Disposal by individual or trust (not company structure)
4. The CGT discount provisions apply — Section 115-25 ITAA 1997

Get any of these wrong and the discount is lost entirely (not reduced — gone).

The mechanical formula

For an Australian tax resident individual holding US RSU shares:

Without the discount (≤12 months hold):

• Capital gain = sale price (AUD) − cost base (FMV at vest, AUD)
• Net capital gain added to assessable income
• Taxed at marginal rate

With the discount (>12 months hold):

• Capital gain = sale price (AUD) − cost base (FMV at vest, AUD)
• Apply 50% discount: discounted gain = capital gain × 0.5
• Discounted gain added to assessable income
• Taxed at marginal rate

The mechanic isn't a lower tax rate. It's a 50% reduction in the gain BEFORE it hits assessable income. Mathematically identical to halving the effective CGT rate.

Worked example: Atlassian engineer in Sydney

A senior engineer at a US tech company, Sydney resident, vests 500 shares of AAPL at USD 200 = USD 100,000 (~AUD 150,000 at 1.50 AUD/USD). One year later, shares are at USD 240 (+20%). Sale would yield AUD 180,000 (1.50 rate held constant for simplicity).

Vest event (Division 83A):

• Assessable income inclusion: AUD 150,000 at vest
• Marginal tax + Medicare at 47%: AUD 70,500 tax owed (typically met through employer withholding)
• Cost base for future CGT: AUD 150,000

Scenario A — sell at month 11 (no discount):

• Capital gain: AUD 180,000 − AUD 150,000 = AUD 30,000
• No discount, full gain in assessable income
• Tax at 47%: AUD 14,100

Scenario B — sell at month 13 (50% discount):

• Capital gain: AUD 180,000 − AUD 150,000 = AUD 30,000
• Discount: AUD 30,000 × 50% = AUD 15,000 in assessable income
• Tax at 47%: AUD 7,050

Tax saving from waiting 2 extra months: AUD 7,050. On a single vest. For someone vesting quarterly across a four-year package, the cumulative savings are six figures.

When the discount is NOT worth holding for

The trap with the 50% CGT discount is that it incentivises holding stocks past their fundamental sell point.

Counter-example — concentration management:

Same engineer accumulates 4 years × USD 100K = USD 400,000 of vested AAPL at average vest price USD 180. By year 5, that's 25-40% of their total liquid net worth, all in one stock. Stock drops 30% during a tech rotation.

• Pre-drop value: AUD 600K
• Post-drop value: AUD 420K
• Loss: AUD 180K
• Maximum tax saving from holding for 50% discount: AUD 40K-50K (depending on cohort)

Net result: holding for the discount lost AUD 130K+ versus selling at vest and diversifying. The discount is a TAX strategy, not an INVESTMENT strategy. It works best when your conviction in the underlying stock is strong AND your overall position size is manageable.

The decision framework for Australian RSU holders

For each RSU vesting tranche, work through:

Question	If yes → sell at vest	If no → hold for discount
Is RSU stock >20% of liquid net worth?	Sell to diversify	Hold
Has your conviction in the stock changed?	Sell	Hold
Are you in a transitional life event (mortgage deposit, child)?	Sell for cash	Hold if discretionary capital
Is the stock at materially above all-time-high valuation?	Sell to lock in gain	Hold if you believe in upside
Is your current year marginal rate above 37%?	Sell into lower-income year	Hold for discount

Pragmatic Australian RSU holder framework:

• Auto-sell 50% at vest for diversification, tax certainty, and cash availability
• Hold 50% past 12 months for the discount on the half you're keeping
• Review quarterly based on price action and concentration

This balances tax optimisation with diversification discipline.

Interaction with ESS Division 83A

Division 83A of the Income Tax Assessment Act 1997 handles the Australian employee share scheme (ESS) tax treatment for vest. The mechanics:

• Vest = right exercised → FMV included in assessable income (Section 83A-10)
• Cost base for CGT = FMV at vest (Section 83A-15)
• CGT clock starts at vest for the 50% discount (12-month measurement)
• No tax deferral for non-startup RSUs (Division 83A subdivision B applies — for most Australian-employed RSU holders at established companies, no deferral applies)

For most Australian RSU holders at US tech companies, this all happens automatically via Single Touch Payroll. The vest income appears in your end-of-year payment summary. Your responsibility starts with the subsequent disposal mechanics.

Edge case: ESS deferral (subdivision C). A narrow category of "startup concession" eligible Australian RSU holders may qualify for ESS deferred taxation. Most US-listed company RSU holders DO NOT qualify (employer must be unlisted or small). Confirm with a tax agent if you think you might fall under this — the rules are restrictive.

Comparison: Australia vs US vs UK

Quick reference for cross-border RSU holders:

Country	LTCG holding period	LTCG effective rate (top bracket)
Australia	12 months	23.5% (50% discount × 47% marginal)
United States	12 months	23.8% (20% LTCG + 3.8% NIIT)
United Kingdom	None	24% (post-30 Oct 2024)
Canada	None (inclusion rate-based)	26.65% (50% inclusion × 53.5% top BC rate)
Germany	None	26.375% Abgeltungsteuer (flat)
Singapore	N/A	0% (no CGT)
UAE	N/A	0% (no CGT)

Australia and US are similar — both reward holding past 12 months. The UK does NOT reward holding (24% is the same regardless of holding period). Canada uses a 50% INCLUSION rate (not discount) regardless of holding period.

Super (superannuation) as the alternative wrapper

For Australian RSU holders also considering super wrappers:

• Concessional contributions: AUD 30,000/year (2024-25), tax-deductible, 15% contributions tax inside super
• Non-concessional contributions: AUD 120,000/year (2024-25) or AUD 360,000 bring-forward, no tax deduction but tax-free inside super
• CGT inside super (accumulation phase): 15% on gains, BUT 33.3% discount on assets held >12 months = effective 10% on long-term gains
• CGT inside super (pension phase): 0%

For high earners with material RSU income, sweeping the proceeds of vested RSUs into super (after vest tax + sale CGT) via non-concessional contributions builds long-term US stock exposure inside a 10% effective LTCG environment — far better than the individual 23.5% even with discount.

Trade-off: super money is locked until preservation age (60). Not suitable for medium-term goals.

Common Australian RSU mistakes

Mistake 1: Counting the grant-to-vest period toward 12-month CGT clock. The clock starts at vest, not grant. If you vested in March 2025 and sold in February 2026, you held 11 months from CGT perspective, regardless of when the RSU was granted.

Mistake 2: Forgetting AUD/USD conversion on cost base. Cost base = FMV at vest in AUD. If vest was at AUD 1.55 = USD 1 and you compute everything in USD, you'll understate your cost base when AUD strengthens to 1.45 = USD 1 at sale. Use the right AUD/USD rate at each event.

Mistake 3: Holding too long past concentration thresholds. As discussed — the discount is a tax bonus, not an investment thesis.

Mistake 4: Not using specific identification for mixed parcels. If you have 100 shares with FIFO acquisition spanning multiple vests, ATO accepts specific identification. For mixed >12-month and <12-month parcels, specific identification of the >12-month parcel maximizes discount eligibility.

Mistake 5: Misreporting on ATO Tax Return. US RSU sales go on the capital gains schedule, not the foreign income schedule. Foreign income schedule is for US dividend income (Section 23AG type items).

Cross-references

• Australian residents with US RSUs: complete tax + filing guide — the parent guide covering Division 83A, FITO, Super, and best brokers
• Australia markets and RSU tax hub — quick reference + related deep dives

Bottom line

The 50% CGT discount is Australia's biggest tax break for RSU holders. Hold past 12 months from vest and halve the tax on any appreciation. For a 47%-marginal-rate Sydney engineer, that's a 23.5% effective LTCG rate — among the best in the developed world. But the discount is a tax tool, not a thesis. Use it when your conviction is strong and concentration is acceptable. Sell at vest when diversification is the bigger issue. The dumbest move is to hold a deteriorating stock past 12 months for the discount and watch the discount become irrelevant against the loss. Document acquisition dates carefully. Use specific identification when possible. And consider super as the longer-horizon wrapper for surplus capital.