The biggest retirement mistake Australians make isn’t a dramatic investment blunder. It’s a quiet structural decision that 700,000 people over 65 are making right now without realising it: leaving their super in accumulation phase after retiring. The cost, according to Super Members Council research released in October 2025, can be up to $136,000 of lost retirement income per person across the course of retirement, or roughly $6,500 a year.
That’s the headline. The full picture is more uncomfortable. Most Australians retire making three or four of these same structural mistakes simultaneously, and most of them are completely avoidable with proper planning in the five years before retirement.
This guide covers the seven most common and most expensive retirement mistakes Australians make in 2026, why each one costs money, and what the planning fix looks like. These are drawn from the patterns we see most often in client conversations, backed by the most recent government and industry data.
The mistakes, ranked by how much they typically cost
- Leaving super in accumulation after retiring (up to $136,000 per person)
- Misreading the Age Pension assets test (often $5,000 to $20,000+ per year unclaimed)
- Going too conservative with super too early (often $100,000+ over a 10-year retirement)
- Missing catch-up concessional contribution windows ($13,000+ in unnecessary tax per use)
- Withdrawing super as a lump sum without modelling the consequences (highly variable, often $50,000+ lost)
- Not updating super death benefit nominations (up to $68,000 of unnecessary tax on a $400K balance)
- Retiring without honestly estimating spending in your 80s (often years of funding lost)
We’ll walk through each.
Mistake 1: Leaving super in accumulation after you retire
This is the single most expensive retirement mistake Australians are making in 2026, and it’s the one most retirees don’t even know they’re making.
Earnings inside a super accumulation account are taxed at up to 15% per year. Earnings inside an account-based pension in retirement phase are taxed at zero. Once you retire and meet a condition of release (generally turning 65, or retiring after preservation age), you can convert your accumulation account into an account-based pension and stop paying tax on investment earnings.
Super Members Council research found that around 700,000 Australians over 65 who aren’t working full-time still have their super sitting in accumulation. Together, they hold $90 billion in accumulation accounts. On average, this costs each of them an extra $650 a year in tax. Over a 20-year retirement on a $200,000 balance, that’s around $9,000 in unnecessary tax. The October 2025 follow-up report from the SMC modelled total lifetime cost at up to $136,000 per person when you factor in compounding lost growth, suboptimal drawdown timing, and fund quality differences.
Why retirees don’t act: SMC research shows 39% of retirees with low super balances simply don’t know what to do. Only 26% have asked their super fund for advice. The default behaviour is to leave the account untouched, and the system doesn’t automatically move you across.
The fix: When you retire and meet a condition of release, contact your super fund (or speak to a financial adviser) about converting your accumulation balance into an account-based pension. The conversion is generally free, takes a few weeks, and stops the 15% tax on earnings from that date forward.
Please note: All figures, projections and scenarios in this article are approximate and for illustrative purposes only. Individual outcomes will vary based on personal circumstances, investment returns, fees, and current government policy. This is general information, not personal advice.
Mistake 2: Misreading the Age Pension assets test
This is the costliest retirement misconception in the Australian system. Many Australians assume they won’t qualify for the Age Pension because they have super. Others assume they’ll automatically get the full pension. Both assumptions are wrong, and both leave money on the table.
The Age Pension assets test has two thresholds: the lower threshold (below which you receive the full pension) and the upper threshold (above which you receive nothing). In between, the pension reduces by $3 per fortnight for every $1,000 of assets over the lower threshold.
As at 20 March 2026, for a homeowner couple:
- Full pension below: $481,500 combined assessable assets
- No pension above: $1,085,000 combined assessable assets
For a homeowner single:
- Full pension below: $321,500 assessable assets
- No pension above: $722,000 assessable assets
A homeowner couple with $700,000 in assessable assets doesn’t receive zero pension. They receive a part pension of around $13,000 per year combined, plus the Pensioner Concession Card which has real value in healthcare and utility discounts. That’s $13,000 a year many couples are not claiming because they assumed they didn’t qualify.
The income test also runs alongside the assets test. Centrelink pays whichever produces the lower pension. The Work Bonus adds another layer where partners are still working. If you’ve never had the test calculations done for your specific situation, the odds are reasonable you’re either getting less pension than you’re entitled to, or you’ve ruled it out without checking.
The fix: Model your projected position at age 67 against current Services Australia thresholds. The Pensioner Concession Card alone is worth hundreds to thousands a year in concessions even if the pension itself is modest. Our post on the March 2026 Centrelink changes walks through worked examples.
Phil and Dan broke this down with real case studies in Episode 9 and Episode 10 of the Wealthlab Podcast. Episode 10 includes a worked example where the timing of selling an investment property dropped one client’s CGT bill from $98,000 to $11,000 by combining retirement-year timing with catch-up contributions.
Mistake 3: Going too conservative with super too early
Switching to fully cash or conservative super options in the years before retirement feels safe. In practice, it’s one of the most quietly damaging mistakes pre-retirees make.
A conservative super option typically earns 3 to 4% per year. A balanced option earns 5 to 6% over a full market cycle. The difference between 3.5% and 5.5% on a $500,000 balance over a 10-year retirement is roughly $120,000 in foregone returns.
Retirement doesn’t mean you’ll spend all your money in the next five years. The average retirement now lasts 20 to 30 years. Money you won’t need until your 80s should still be invested in growth assets. Only money you’ll genuinely need in the next one to two years belongs in cash or defensive holdings.
The fix: Hold a cash buffer of 1 to 2 years of essential spending. Keep the remainder in a balanced or moderate growth allocation. This is sometimes called a “bucket” approach. It protects against having to sell growth assets in a downturn while letting the bulk of the balance keep working.
Scott and Phil covered exactly how getting the investment mix wrong around retirement can cost retirees tens of thousands, including a real GFC-era client case study, in Episode 1 of the Wealthlab Podcast. The example they walked through: a couple with $500K in super spending $75K a year. A growth portfolio funded retirement to their late 90s. A conservative portfolio ran out 15 years earlier. Same average return, very different outcomes.
Mistake 4: Missing catch-up concessional contribution windows
This is the mistake with the shortest expiry. If you don’t use the opportunity, it disappears for good.
If your total super balance was below $500,000 at 30 June of the previous financial year, and you haven’t fully used your concessional contributions cap in earlier years, you can make a single large contribution using up to five years of unused cap space. Unused amounts can only be carried forward for five years before they expire.
With the current concessional cap at $30,000 per year, and many Australians having years where their employer’s 12% Super Guarantee was the only contribution going in, the unused cap space adds up. A one-off catch-up contribution of $60,000 taxed at 15% inside super instead of a 37% marginal rate outside saves around $13,200 in tax. That same $60,000 then sits inside super earning tax-free returns from pension phase onwards.
The expiry that matters in 2026: Unused concessional cap amounts from 2020-21 expire on 30 June 2026. If you have unused cap space from that year and haven’t used it, the window is closing fast. Check your available carry-forward balance via the ATO’s MyGov portal under super.
The fix: Review carry-forward concessional cap space annually, particularly in the years just before retirement when income (and marginal tax rate) is often at its highest. The combination of a strong working year and unused cap space is the ideal time to use it.
Mistake 5: Withdrawing super as a lump sum without modelling the consequences
Taking a large lump sum from super at retirement and parking it in a bank account, or using it all to pay off the home, feels like security. It often costs more than people realise.
Three things you give up:
Tax-free investment earnings. Inside an account-based pension, returns are tax-free. In a bank account, interest is taxed at your marginal rate. On $300,000 earning 4% interest, the tax difference at a 19% marginal rate is around $2,280 per year.
Age Pension flexibility. Money inside an account-based pension can be drawn down gradually, reducing assessable assets over time and potentially increasing your Age Pension entitlement as you age. A lump sum in a savings account is fully assessable from day one.
Compounding. Money that stays invested keeps working. Money sitting in a transaction account doesn’t.
The right answer isn’t always “keep it all in super”. Sometimes a partial lump sum makes sense to clear debt, fund a planned major expense, or hold a meaningful cash buffer. But the default of “withdraw everything when I retire” is rarely the optimal structure.
The fix: Model the tax, Age Pension, and long-term income consequences of a lump sum withdrawal before making it. For most retirees, a structure that keeps the bulk of super in an account-based pension and only withdraws what’s genuinely needed produces better long-term outcomes.
Mistake 6: Not updating super death benefit nominations
This is the retirement mistake that doesn’t cost you anything while you’re alive but can cause enormous financial damage to the people you leave behind.
Super does not automatically form part of your estate. It is not controlled by your will. If you die without a valid binding death benefit nomination, the trustee of your super fund has discretion to decide who receives your super. In a blended family situation, this can override your actual wishes entirely.
Binding nominations in many industry super funds expire every three years. A nomination set up at 55 may have lapsed twice by the time you’re 62. Lives change in that time. New partners, new grandchildren, changed relationships, changed views about who should inherit what.
The tax stakes also matter. Super paid to a spouse is tax-free. Super paid to an adult child who is not financially dependent on you can be taxed at up to 17%. The difference on a $400,000 super balance is $68,000 in unnecessary tax.
The fix: Check the current status of your binding death benefit nomination with your super fund. Confirm it’s current, that it reflects your actual wishes, and that it aligns with your will and broader estate plan. Set a calendar reminder for the renewal date.
Scott and Phil covered this in detail in Episode 12 of the Wealthlab Podcast on super death benefits and estate planning.
Mistake 7: Retiring without honestly estimating your spending in your 80s
This is the most common misconception about estimating retirement income, and the one that quietly undermines otherwise well-planned retirements.
Most pre-retirees estimate their retirement spending based on what they spend now, in their late 50s, when they’re relatively healthy and mortgage payments dominate the budget. The actual spending pattern of a 30-year retirement looks very different.
Around 34% of total retirement savings is consumed by healthcare costs across the course of retirement. The final 24 months of life typically account for 50 to 80% of a person’s lifetime healthcare spending, according to research cited in Episode 19 of the Wealthlab Podcast. Private health insurance for a couple in retirement runs $3,000 to $5,000 per year, and that’s just the baseline. Residential aged care can cost $50,000 to $150,000 per year depending on the level of care.
Spending also doesn’t stay flat. The pattern most retirees follow is a “spending wave”: higher spending in the first 10 years (travel, lifestyle, helping grandchildren), a quieter middle period, then a sharp increase in the final years as healthcare and care costs ramp up.
The fix: Model your retirement spending across three phases, active retirement (60s to mid 70s), slower years (mid 70s to mid 80s), and care phase (mid 80s onwards). Build in explicit allowances for private health, out-of-pocket medical costs, and either home care or residential aged care. The number to plan around is rarely the same as the number being spent now.
Bonus: the mistake that creates all the others
Australians who get retirement planning advice in their mid-50s typically make better contribution decisions, better investment allocation decisions, better drawdown decisions, and better Age Pension decisions than those who go it alone or get advice too late.
By the time many people see a financial adviser about retirement, they’re 62 and retirement is 12 months away. By that point, several of the most valuable opportunities (catch-up contributions, contribution timing, asset structuring before pension age, partner super planning before both partners hit 67) are already closed or significantly diminished.
The ideal window for retirement planning advice is 5 to 7 years before your planned retirement date. Early enough to act on what you learn. Early enough for catch-up strategies to actually work. Early enough that the structural decisions about super, debt, and asset positioning still have time to play out before you stop working.
Frequently asked questions
What are the biggest retirement mistakes Australians make? The most common and costly retirement mistakes in Australia in 2026 are: leaving super in accumulation phase after retiring (around 700,000 retirees, costing up to $136,000 each across retirement), misreading the Age Pension assets test and not claiming entitlements, switching to overly conservative super too early, missing the five-year window on catch-up concessional contributions, withdrawing super as a lump sum without modelling the consequences, leaving binding death benefit nominations expired, and underestimating healthcare costs in the 80s.
What is the single biggest superannuation mistake retirees make? Leaving super in accumulation phase after retiring. Earnings in accumulation are taxed at up to 15%. Earnings in an account-based pension in retirement phase are tax-free. Around 700,000 Australians over 65 are currently making this mistake, costing each of them up to $9,000 in unnecessary tax over a typical retirement on a $200,000 balance, and far more when compounding lost growth is factored in.
What’s the most common misconception about estimating retirement income? Estimating future spending based on current spending patterns. Most pre-retirees in their late 50s budget for retirement based on what they spend now, missing the spending wave (high in early retirement, quiet in the middle, steep in the final years), the healthcare cost ramp in your 80s (50 to 80% of lifetime healthcare spending occurs in the final 24 months of life), and the long duration of retirement (average 20 to 30 years). The result is a plan that underfunds the years that matter most.
At what age should I get retirement planning advice in Australia? Five to seven years before your planned retirement date is the ideal window. This gives time to implement catch-up concessional contributions before the five-year carry-forward window expires, to structure super and investments before pension age, and to model Age Pension scenarios before they’re locked in. Many Australians wait until 12 to 18 months before retirement, which closes off some of the most valuable strategies.
How does the Age Pension assets test work? The assets test reduces your pension by $3 per fortnight for every $1,000 of assessable assets above the lower threshold. As at March 2026, the full pension applies below $321,500 for a single homeowner ($481,500 for a couple), with the pension cutting out entirely at $722,000 ($1,085,000 for a couple). Between those thresholds, you receive a part pension. The most common mistake is assuming the assets test results in zero pension when in fact a meaningful part pension still applies.
Is it a mistake to pay off my mortgage with my super? It depends. For high-interest consumer debt like credit cards and personal loans, clearing the debt before retirement is almost always the right call. For a mortgage, the answer depends on the interest rate, your super balance, expected investment returns, your comfort with debt, and your Age Pension position. A mortgage at 5.5% versus a balanced super option returning 6.5% is a genuine trade-off worth modelling. Don’t default either way without running the numbers.
Do I need to update my super death benefit nomination? Yes, regularly. Binding death benefit nominations in many industry super funds expire every three years. If your nomination has lapsed, the trustee of your fund has discretion over who receives your super, which may not match your wishes. Super paid to a non-financially-dependent adult child can be taxed at up to 17%, where super paid to a spouse is tax-free. The financial stakes of getting this wrong can be tens of thousands of dollars.
How much super do I need to avoid these retirement mistakes? The mistakes aren’t tied to a particular super balance. A retiree with $200,000 making all seven of these mistakes is materially worse off than one with the same balance who has structured things well. Equally, a retiree with $1 million can leave significant money on the table by leaving super in accumulation, misreading the Age Pension assets test, or making the wrong drawdown decisions. The structural decisions matter more than the absolute balance for most retirees.
Worth getting right
The biggest retirement mistakes Australians make in 2026 aren’t dramatic. They’re quiet structural decisions in the final years of work that compound into materially worse outcomes. The good news is most are avoidable once you know to look for them.
If you’d like to work through which of these apply to your specific situation, book a free chat with the Wealthlab team. No cost, no pressure, no jargon. We focus specifically on Australians in their 50s and early 60s, which is the window where most of these mistakes can still be fixed.
For a general snapshot of where you stand, the Wealthlab retirement quiz is a useful starting point. And for more on how each of these mistakes plays out in practice, The Wealthlab Podcast covers them in detail with Scott and Phil.
