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Capital Gains Yield Calculator
Capital Gains Yield Calculator
Capital Gains Yield
30.00%
Yield Analysis
The position gained $12.75 per share, a capital gains yield of 30.00%. Annualized over 3 years, that is 9.14% per year, and with $2.10 of dividends the full return reaches 34.94% (10.50% per year).
Price-based return only. Does not account for CGT on realised gains (including the 50% discount), brokerage, or the timing of dividend payments. Educational only, not investment or tax advice.
The Price Half of Every Total Return
Every investment return is two parts: income you collect along the way and the change in the asset's price. The capital gains yield isolates the second part — the percentage gain (or loss) generated purely by price appreciation, measured against what you originally paid. Brokers, fund managers and your annual tax statement all separate these two streams because they are taxed differently and driven by different forces. For a growth investor in an ASX company that pays no dividend, capital gains yield is effectively the whole story. For Australian investors the number matters beyond bragging rights. Capital gains are taxed at your marginal rate — but if you have held the asset for more than 12 months, only half the gain is taxable thanks to the CGT discount. Understanding exactly how much of your return is price appreciation therefore shapes your after-tax planning and the timing of any sell decision. It also keeps score honestly: a stock that rose 30% over five years sounds great until you annualise it to about 5.4% a year — below the long-run ASX. The capital gains yield, annualised, is the true yardstick for whether an appreciated position earned its keep.
Price Change Divided by Cost Base
The capital gains yield is (Current Price − Purchase Price) ÷ Purchase Price, expressed as a percentage. The purchase price is your cost base — the price actually paid plus costs, not the price when the story began. A $42.50 entry that reaches $55.25 has a $12.75 gain, and 12.75 ÷ 42.50 = 30%. Dividends received are excluded from the yield itself; they are tracked separately as income, and the two add up to the total return. The calculator also annualises the result so multi-year holdings can be compared fairly: Annualised Yield = (Current ÷ Purchase)^(1 ÷ Years) − 1. The same 30% gain earned over three years is roughly 9.1% per year; earned over ten years it is only about 2.6% per year. The exponent — the geometric mean — is what keeps compounding honest, and it is also where intuition fails most investors. Finally, for realised positions the yield feeds directly into the capital gain: gain dollars = yield × cost base × shares, taxable at your marginal rate — halved under the CGT discount once you have held the asset for over 12 months.
Expert Insights
Always Annualise Before You Judge
A raw gain without a time frame is marketing, not math. Convert every position to its annualised capital gains yield before comparing it against an index fund or a new opportunity. A 45% gain over eight years is only 4.7% a year — most diversified investors would have beaten it without picking a single stock. Annualising levels the playing field between holdings of different ages and exposes winners that are merely old.
The Cost Base You Track Is the Basis You're Taxed On
Share splits, rights issues, spin-offs and reinvested dividends all change your cost base, and an inaccurate cost base distorts both your yield and your CGT bill. Many broker statements exclude reinvested dividends by default, overstating the apparent gain. Before acting on a yield figure — especially near the 12-month mark that flips CGT from full marginal-rate tax to half-rate under the discount — confirm the cost base the ATO would actually use.
Large Gains Create Harvesting Opportunities
A large accumulated capital gain is an unrealised tax liability sitting in your portfolio. In low-income years — when your marginal rate drops — realising part of that gain can cost little in tax and permanently raises your cost base. Superannuation investors use the same logic through recontribution rules. Individual investors rarely think this way, yet the arithmetic that makes it work is exactly what this calculator shows.
Actionable Tips
- 1
Compare Each Winner to Its Benchmark
Pull up the annualised capital gains yield for every individual ASX stock you hold and line it against a broad index over the same window. Positions underperforming the index for three-plus years deserve a hard look: the CGT cost of selling is real, but so is the opportunity cost of capital locked into a lagging position. Write the comparison down — the discipline matters more than any single decision.
- 2
Track Yield and Income Together
Enter your dividends into this calculator so you see how much of the total return came from price versus income. In mature ASX dividend payers, franked income often accounts for 40% or more of long-run total return, which changes how you should treat a flat price. A stock with a modest capital gain but a rich dividend stream may be performing much better than its price chart suggests.
- 3
Use the 12-Month Mark as a Decision Gate
If you are sitting on a gain and considering selling, check the holding period first. Selling at month eleven makes the whole gain taxable at your marginal rate; waiting past the 12-month CGT mark halves the taxable amount. The yield tells you the size of the reward — the calendar tells you what the ATO keeps. For positions bought at different times, check the cost base of each parcel before trimming.
Real-World Examples
Marcus Sold a Winner and Was Surprised by the Math
Marcus bought an ASX tech stock at $42.50 and celebrated when it hit $55.25 — a clean 30% gain. Then he annualised it: 9.1% a year over three years, barely ahead of the index fund his super already held, and with far more volatility. When an offer made him consider cashing out, the calculator showed the gain was past the 12-month mark, so only half was taxed at his marginal rate. He sold a portion tax-efficiently and rolled the proceeds into the index, keeping roughly the expected return at a third of the risk.
Gloria's 'Loser' Was Actually Paying Her
Gloria held a utility stock that fell from $30 to $24.50 in two years and kept it only for the $1.20 a share in dividends, feeling like a failure. Running the numbers showed a capital gains yield of −18.3%, but dividend income offset nearly 4% per year, making the total return closer to −14% over two years than the scary price chart implied. More importantly, the honest arithmetic showed the company's acquisition offer at $31 would produce only a small realised gain, so she held through and collected the income stream she'd been ignoring.
Devon Learned the Compounding Shortcut in Reverse
Devon's portfolio piece had doubled from $80 to $162, and he told friends he'd made 100%+. This calculator pointed out the honest figure: 9.8% annualised over ten years — fine but not spectacular, and the holding had taken a decade of concentration risk. He rebalanced half the position into a diversified fund the following year. The lesson stuck — ever since, every family investment discussion starts with the annualised number, not the cumulative one.
Glossary of Terms
- Capital Gains Yield
- The percentage return from an asset's price appreciation alone: (current price − cost base) ÷ cost base, excluding dividends and income.
- Cost Base
- The original amount paid for an investment plus incidental costs, adjusted for splits, rights and reinvested dividends — the ATO reference point for computing a taxable capital gain.
- CGT Discount
- Australia's 50% reduction of a capital gain when an individual or trust holds an asset for more than 12 months before the CGT event.
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Ivy Sinclair-Wren
Financial Chaos Analyst
Ivy Sinclair-Wren is a Financial Chaos Analyst covering investing, AI, wealth psychology, and the emotional consequences of opening finance apps during market crashes. Based in Melbourne, she specializes in demystifying the Australian tax code and helping users navigate the intersection of spreadsheet logic and human irrationality.