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Taxable vs. Tax Deferred Investments Calculator
Taxable vs. Tax-Deferred Investments
Tax you pay each year on interest, dividends, and distributions in a taxable account.
Ordinary income rate paid when withdrawing from the tax-deferred account.
Tax-Deferred After-Tax Value
$267,090.53
Deferral Advantage
+$48,411.18
22.1% more by deferring taxes
Tax Strategy Analysis
Deferring taxes lets the full 8% compound untouched for 25 years. The result: $267,090.53 after retirement taxes versus $218,679.35 in a taxable account — a $48,411.18 (22.1%) edge from the ATO waiting 25 years to collect.
*Simplifies to an annually-taxed account versus a tax-deferred wrapper. Real outcomes depend on franking credits, CGT discount timing, super contribution caps and preservation age. Educational only, not financial or tax advice.
Where Your Money Sits Decides What It Keeps
Two identical portfolios earning identical returns can finish decades apart purely because of where they were held. In a standard taxable brokerage account, income is taxed as it arrives — interest and unfranked distributions at your full marginal rate every year — so each year's return compounds on an already-shrunken base. In a tax-deferred wrapper, taxation waits: the full gross return keeps compounding untouched until withdrawals begin. For Australians the tax-deferred wrapper is overwhelmingly superannuation, where investment earnings are taxed at just 15% during accumulation and 0% once you move into pension phase after 60. The gap this creates is not subtle. A growth portfolio yielding 8% inside a middle-bracket taxpayer's brokerage account effectively compounds near 5.4% once annual tax is paid; the same portfolio inside super compounds at 6.8%, and later draws nothing in tax at all. Over twenty-five years that two-speed compounding routinely separates the balances by tens of thousands of dollars on modest starting amounts. This calculator quantifies your own version of that trade-off: it grows one lump sum through annually-taxed compounding and the same sum through deferred compounding with an exit tax applied at withdrawal, then reports the advantage, its percentage, and the total bill the deferral avoided. The inputs are deliberately simple — the point is the structural comparison, not fund-level precision.
Two Compounding Engines, One Exit Tax
The taxable path applies the classic after-tax compounding formula: each year's return is multiplied by one minus the annual tax rate before compounding — $50,000 at 8% taxed annually at 32% behaves like $50,000 at 5.44%. After N years that produces principal times (1 + r×(1−t))^N. The deferred path lets the full 8% run: principal times (1 + r)^N, then applies a single tax at withdrawal using the retirement rate — modelling the reality that super's tax is settled along the way at 15% or, in pension phase, not at all. Three readouts make the mechanics visible. The advantage is simply deferred-after-tax minus taxable-final — the dollar prize for waiting. The percentage view normalises it against the taxable outcome so differently sized comparisons stay meaningful. And the deferred tax bill line shows what the exit actually cost, which is why the retirement-rate input matters so much: at 15% the shelter still wins comfortably across most horizons, but at zero — the position of every Australian drawing a super pension after 60 — the comparison stops being close. Note the honest caveat baked into the model: money entering super generally cannot be touched until preservation age, so the calculation prices a liquidity sacrifice as well as a tax outcome.
Expert Insights
Super Is Not Just Deferred — It Is Cheaper at Every Stage
The textbook tax-deferral story undersells Australia's system. Money moving into super via salary sacrifice or deductible contributions swaps your marginal rate for a flat 15% on the way in, earnings are taxed at 15% rather than your marginal rate throughout, and pension-phase withdrawals after 60 are entirely tax-free. That three-stage advantage means even taxpayers on modest brackets usually win by directing investments through super — the only question is how much, given caps and access rules.
Match the Wrapper to the Timeline, Then Fill It First
Because super is locked until preservation age, sequence matters: money needed before 60 stays outside, long-horizon wealth goes inside first. A practical rule many planners use is fill the concessional caps early in the year (or carry-forward window), keep an emergency buffer outside, then invest everything genuinely surplus through super. The calculator shows why the order pays — every dollar of growth assets shifted from the 32% column to the 15%-then-0% column compounds faster for decades.
The Taxable Account Has Weapons of Its Own
Outside-super investing is not raw: franking credits attach to Australian share dividends, capital gains wait until sale and halve after twelve months, and losses can offset gains. An investor holding ASX shares long-term might convert a nominal 8% pre-tax return into nearly 7% after-tax — far better than naive annual-tax arithmetic suggests. Compare wrappers honestly by including those features in your effective 'annual tax rate' estimate rather than assuming the worst case.
Actionable Tips
- 1
Set the Retirement Rate to Zero Before Age 60 Planning
If your super will be drawn after turning 60 as a pension, set the retirement tax rate input to 0% — that is genuinely what applies to most Australian retirees' super withdrawals. Watching the advantage figure jump when you change 15% to 0% makes the pension-phase payoff concrete, and often settles family debates about whether extra salary sacrifice is worth the reduced take-home pay.
- 2
Estimate Your True Annual Tax Drag Honestly
Before accepting a headline marginal rate as the taxable-account input, adjust for what your actual holdings generate: fully franked dividends carry a built-in credit, long-held shares defer gains until sold, and index ETFs distribute less than active funds. A realistic effective drag might be well below your bracket rate. Run both a conservative and an honest figure — if super still wins against the flattering number, the case is closed.
- 3
Check Caps Before Redirecting Everything
Concessional contributions are capped ($30,000 for 2024-25 plus any unused cap carried forward) and non-concessional ones too, so 'invest it all through super' eventually hits limits. The right mental model is a bucket order: employer SG first, salary sacrifice or deductible personal contributions up to the cap, then overflow investments back to the taxable account. This calculator tells you what each redirected dollar earns; contribution-cap knowledge tells you how many dollars can go.
Real-World Examples
Priya Priced Her Salary Sacrifice Properly
Priya, 38 on $105,000, wondered whether sacrificing $10,000 a year beat building an ETF parcel outside super. Running her numbers — roughly 34% marginal drag outside against 15% inside, heading to 0% at pension phase — showed the sacrificed route projecting around $95,000 more over twenty-two years on the same gross outlay. She started sacrificing to the cap the next pay cycle, kept six months of expenses liquid outside, and stopped second-guessing the smaller payslip.
Tom Discovered Timing Beats Brackets
Tom retired at 58 planning to draw on his super at 60 but assumed his taxable share portfolio should feed the gap years. The comparison showed his $180,000 outside-money growing at effectively 5.2% while the same exposure inside super ran at 6.8% — and would be untaxed from 60. He restructured: two years of bridge cash outside, everything longer-term left compounding inside. The difference funded the caravan he had planned to postpone.
Amelia Gave the Brokerage Account Its Due
Amelia assumed all her investing should move into super until she modelled her actual holdings: fully franked bank dividends and decade-old parcels barely taxed annually. With an honest 12% effective annual drag instead of her 39% bracket rate, the taxable account closed much of the gap — and remained accessible for the house deposit she wanted at 45. She split future savings between capped super contributions and the brokerage account without guilt, knowing precisely what each wrapper was worth.
Glossary of Terms
- Tax Deferral
- Postponing tax on investment returns until withdrawal, letting the full pre-tax return compound in the meantime.
- Pension Phase
- The superannuation stage after meeting a condition of release (such as turning 60 and retiring), where fund earnings and most withdrawals are tax-free.
- Tax Drag
- The portion of investment return lost to taxes paid along the way - the gap between gross and after-tax compounding rates.
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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.