DIY financial planning can work for some, especially if finances are simple, you have good knowledge and discipline. But for many people, the downsides are significant. Here are key pitfalls, backed by evidence, to be aware of.

Key Questions to Ask Yourself Before Going DIY

If you're considering managing your finances independently, here are some essential questions to ask. Honest answers will help you see if DIY is viable, and where you need to bring in external help.

1. What are my financial and life goals — short term and long term?
2. How much of my financial situation is simple, and how much is complex?
3. What is my knowledge base around investment, risk, tax, estate law, regulations?
4. What is my tolerance for risk (loss, volatility, illiquidity)?
5. How will I handle ongoing monitoring, reviews, and adjustments?
6. Have I considered all costs — fees, taxes, time opportunity cost?
7. Do I understand estate planning well enough to protect my heirs and my wishes?
8. Am I aware of regulatory / legal environment and future changes?
9. Do I know when I should / must seek professional help?

 

Risk Category	What can go wrong in DIY planning	Supporting Data / Examples
Lack of knowledge / financial literacy	Misunderstanding basics (inflation, compound interest, diversification), which leads to suboptimal investment or savings decisions; failure to set realistic goals; inability to anticipate tax or regulatory changes.	According to HILDA data, about 55% of adult Australians could correctly answer 3 “Big-3” financial literacy questions; significant gender gaps exist (63% of men vs 48% of women). (api.research-repository.uwa.edu.au) Less literate people tend to have lower super balances and are less satisfied with financial situations. (api.research-repository.uwa.edu.au)
Emotional / behavioural risk	Overreacting to market volatility; chasing high returns; sticking with bad decisions out of inertia; failing to revisit assumptions when circumstances change.	Findex has written that self-investors may overlook tax, estate, or retirement strategies and can fall prey to cognitive biases. (findex.com.au) InvestBlue notes people often fail to adjust portfolios when life circumstances change. (investblue.com.au)
Goal setting / unrealistic expectations	Underestimating future expenses (especially in retirement: healthcare, living costs), overestimating returns, not allowing margin for risk or adverse scenarios (e.g. inflation).	The Australian “Retirement Income Review” and recent Vanguard / Natixis reports show many Australians expect much higher retirement income needs than what current retirees actually have, indicating a gap between retirement hopes and reality. For instance, younger Australians expecting to need about $100,000/year versus current retirees living on ~$55,000/year. (The Australian) Inflation is also seen as a major worry by 80% of Australians. (The Australian)
Risk mismanagement	Overconcentrated investments; insufficient diversification across asset classes; not planning for downside risks; underinsured; ignoring sequence-of-returns risk in retirement; inappropriate asset mix for age/time horizon.	Findex mentions that self investors often don’t diversify adequately. (findex.com.au) DIY finance vs expert advice articles frequently flag under-diversification and poor asset allocation. (investblue.com.au)
Tax optimisation and regulatory oversight	Missing tax breaks; mis-filing; not structuring investments or superannuation efficiently; failing to remain compliant with laws and regulations; being caught off guard by regulation/legislation changes.	One article (Financial Advice Landscape etc) emphasises that advisers help with tax strategies, super contributions and regulatory compliance which self-planners can overlook. (fund-docs.vanguard.com)
Estate planning & succession	Wills or other arrangements drafted poorly (or not at all), failing to cover non-estate assets (super, jointly-owned assets), not updating for life changes, wrong executors or mis-named beneficiaries. Legal ambiguities that lead to disputes.	Research: about 40% of Australian adults do not have a current will. (Ballantyne Law) Estate law firms point out DIY will kits are often inadequate or ambiguous, costly to fix after the fact. (Solomon Hollett Lawyers)
Complacency & lack of review	Setting a plan and never revisiting; not monitoring performance; ignoring changing economic environment; not adjusting as you age, or as goals shift.	Estate planning sources note that many people create plans then let them “gather dust,” forgetting to update after major life events. (ignifylegal.com.au) Also ASFA survey shows only ~51% of adult Australians have consulted any source of information on preparing for retirement. That implies many haven’t even started or kept up. (ASFA)

Key Questions to Ask Yourself Before Going DIY

If you're considering managing your finances independently, here are essential questions. Honest answers will help you assess whether DIY is viable, and where you need to bring in external help.

1. What are my financial and life goals — short term and long term?
   • When do I want to retire, at what lifestyle?
   • Do I intend to purchase property, invest, travel, provide for children, etc.?
   • How much flexibility do I need?
2. How much of my financial situation is simple, and how much is complex?
   • Do I have multiple income sources, trusts, business interests, foreign assets?
   • Do I understand superannuation rules, tax obligations, investment vehicles?
3. What is my knowledge base around investment, risk, tax, estate law, regulations?
   • Am I confident with concepts like diversification, inflation, risk tolerance, market cycles?
   • Do I understand Australian tax brackets, capital gains tax, superannuation taxation?
   • Do I know what obligations, rights, pitfalls exist under state estate law?
4. What is my tolerance for risk (loss, volatility, illiquidity)?
   • How would I respond if markets dropped sharply?
   • What margin of safety do I build into projections?
   • Do I have emergency savings / insurance to weather shocks?
5. How will I handle ongoing monitoring, reviews, and adjustments?
   • Will I revisit my plan annually or after large life events (marriage, children, job change, illness)?
   • Do I have tools or processes for reviewing investment performance vs. benchmarks?
6. Have I considered all costs — fees, taxes, time opportunity cost?
   • Hidden fees in investment products, super funds, account keeping.
   • Cost in time (researching, tracking).
   • Potential tax inefficiencies if done poorly.
7. Do I understand estate planning well enough to protect my heirs and my wishes?
   • Do I have a valid will? Up-to-date? Covers non-estate assets?
   • Do I have powers of attorney (legal and financial) in place? Health directives?
   • How will executor/trustee be chosen, and what qualifications do they need?
8. Am I aware of regulatory / legal environment and future changes?
   • Are there impending law/regulation changes that might affect super, taxes, investments?
   • Am I aware of obligations for record-keeping, disclosure, etc.?
9. Do I know when I should / must seek professional help?
   • When complexity exceeds my capacity (e.g. running own business, trusts, intergenerational wealth, complex tax or foreign income).
   • When legal documents are involved (wills, trusts, power of attorney).
   • When performance is lagging, or risk management is inadequate (insurance, asset protection).

How to Avoid Common Mistakes & Build a Comprehensive Plan

Even if you do much of your planning yourself, you can reduce risk and strengthen your outcomes by following certain best practices.

• Educate yourself in key financial concepts: inflation, compound interest, diversification, tax basics. Use reputable sources: ASIC’s MoneySmart, academic studies, government-provided tools.
• Begin with clear, written goals: both measurable (e.g. “have $X in super by age Y”) and flexible (recognise lots changes).
• Document assumptions and revisit them: projected rates of return, inflation, life expectancy, costs of living. Test them under worse scenarios.
• Ensure diversification of investments: not just across companies, but asset classes (shares, bonds, property, cash), sectors, geographies. Don’t concentrate too heavily or bet everything on a single asset or theme.
• Keep emergency reserves: Have accessible savings or insurance so that you’re not forced to sell investments at bad times.
• Take tax into account from the start: Understand how investment income, capital gains, losses, and superannuation are taxed. Also consider any tax rebates, deductions or strategies legitimately available to you.
• Plan for estate, succession, and incapacity early: Draft a will, keep it updated. Name executors/trustees who can handle the responsibilities. Set up powers of attorney. Consider how to handle succession in business or trust structures.
• Use tools and records: Budgeting tools, financial dashboards, keep records of all transactions, fees, tax documents. Track performance vs benchmark.
• Schedule regular reviews: Life changes (marriage, kids, career change, illness, inheritance) should trigger a review. At least annually audit your financial plan.
• Guard against emotional decision‐making: During market swings avoid panic reactions; stick to long-term strategy once accepted.
• Beware of scams, overly hyped investments: If something seems too good to be true, check carefully. Many high-risk or fraudulent schemes have attracted Australians via poor due diligence. (While not always strictly DIY planning, lack of oversight plays into it.)

When Professional Advice Makes Sense

DIY may work only up to a point. In many situations, professional advice can be cost-justified, even necessary. Here are signals that external, qualified help may be needed:

• You have or expect to have complex finances: multiple sources of income, business ownership, trust structures, foreign income or assets.
• You’re approaching or in retirement: need to plan withdrawals, manage longevity risk, ensure you don’t outlive savings, consider tax and pension eligibility.
• You have significant assets or inheritance** that require protection or planning (estate, liability, intergenerational).
• You’re unsure about legal documents or law (wills, powers of attorney, trusts).
• You're not confident with investment decisions, or you've faced losses, or your portfolio is underperforming.
• You're uncertain about tax optimisation or facing significant tax liability (e.g. capital gains, inheritance, multiple jurisdictions).
• You lack time or desire to keep up with changing regulations, markets, or financial planning tools (super rules, regulatory changes, tax laws).

Professional advisers can bring:

• Deep technical knowledge (tax law, estate law, investment theory).
• Access to institutional tools, scale (investment options, lower fees, discount structures).
• Accountability, compliance. Proper advisers are regulated (ASIC, financial advice laws), so there's legal recourse.

Structuring a Comprehensive Financial Plan: Checklist / Blueprint

To ensure nothing important is missed, here is a suggested structure for a full financial plan. Whether doing it yourself or with a planner, this checklist helps make sure the plan is robust.

1. Current Situation Overview
   • Assets, liabilities
   • Income, expenses
   • Superannuation / pension balances
   • Insurance (life, health, income protection)
   • Tax status and liabilities
2. Goals & Priorities
   • Short-term (1-5 years) goals: emergency fund, paying debt, purchase, travel etc.
   • Medium-term (5-15 years): investments, children's education, property.
   • Long-term / retirement goals: lifestyle, location, healthcare, legacy.
3. Risk and Time Horizon Assessment
   • What’s my risk tolerance? What losses can I accept?
   • What is my investment horizon (how many years to retirement or when I need funds)?
   • Determine allocation aligned with risk/time.
4. Investment Strategy
   • Asset class mix (shares, bonds, real property, alternatives)
   • Diversification plan (by sector, geography)
   • Cost efficiency (fees, product costs)
   • Liquidity: how much accessible vs locked in
5. Tax Strategy
   • Superannuation contributions and tax concessions
   • Capital gains / losses planning
   • Deductible expenses / offsets
   • Structuring investments (e.g. whether held inside super, via trusts, etc.)
6. Estate Planning & Succession
   • Valid will, updated to reflect current family and assets
   • Powers of attorney / medical directives / guardianship if relevant
   • Trusts or other vehicles if needed for business / family wealth protection
   • Beneficiary designations aligned with will and super
7. Insurance & Protection
   • Life insurance, health insurance, income protection
   • Asset protection (liability insurance)
   • Protection for unforeseen events (accident, disability)
8. Cashflow, Budgeting & Debt Management
   • Current budget and projected future budget
   • Plan to pay down high-cost debt (credit cards, etc.)
   • Emergency savings buffer
9. Implementation Plan
   • What actions need to be taken (open account, rebalance, update documents)
   • Assigned responsibilities (you, spouse, adviser)
   • Timeline
10. Monitoring & Review
    • Frequency of reviews (e.g. annually, or after major life events)
    • Benchmarks / performance metrics
    • Are assumptions still holding (inflation, return rates, cost of living)
    • Legal/regulatory changes

Avoiding Common Mistakes: Practical Advice

• Don’t assume that because something worked in the past it will work in the future (e.g. past investment returns, tax rates). Always test assumptions under downside scenarios.
• Be careful about overconfidence: many DIY planners underestimate volatility, costs or their own emotional reactions. Use conservative estimates.
• Avoid “do it tomorrow” procrastination—estate planning especially gets neglected until too late. A will drafted but never updated can cause legal conflict or unintended outcomes. Also, many Australians simply have no will. (Ballantyne Law)
• Don’t ignore the cost of fees, whether for funds, platform, financial products, or legal services. They compound over time and can eat into returns.
• Keep up with superannuation changes, tax law and regulatory changes. Changes to super rules, tax brackets, etc. happen frequently in Australia. Missing those can mean missing opportunities or getting penalties.
• Use trusted sources of information; avoid relying solely on social media, hype, or anecdote. Cross-check with official government resources (ATO, ASIC, MoneySmart, Treasury, etc.).
• When using online tools, templates, DIY will kits, etc., read all fine print. They may not be valid in all states, may not account for all asset types or family circumstances.

When DIY Might Be Enough

Yes, there are situations where DIY can be appropriate, especially if:

• Your financial situation is simple (single income, no trusts, modest savings, no inheritance complexities, no business ownership).
• You have good financial literacy and discipline.
• Your goals are modest and relatively predictable.
• You're willing to spend the time to learn, monitor, adjust.
• You accept that you might make mistakes and have backup plans.

Even then, DIY doesn’t mean “never consult a professional”; occasional check-in, especially for:

• Legal documents (wills, power of attorney).
• Tax returns or complex tax issues.
• Major financial decisions (e.g. property purchase, whether to start a trust, etc.).
• Retirement planning, especially in the years just before or during it.

Why Proper Research & Professional Advice Matter

• Regulation and oversight: Financial advisers in Australia are regulated under laws (e.g. Corporations Act, ASIC oversight), must meet education, disclosure, and conduct requirements. This gives you legal protections you don’t have with many DIY decisions.
• Reducing hidden risks: Professionals are more likely to be aware of less obvious risks or opportunities (e.g. tax law changes, estate law quirks in different states, regulatory changes).
• Evidence of benefit: Studies show that people with higher financial literacy have higher wealth, better super balances, greater satisfaction, better habits (e.g. budgeting, regular saving). Professionals help fill gaps in what individuals know or can do.
• Avoiding costly errors: Legal disputes over wills, tax penalties, loss of benefits, poor investment decisions during bear markets—these can cost many times what paying for advice would have.
• Peace of mind: Knowing that your plan has been stress-tested, is legally valid, your wishes will be respected, etc. That reduces anxiety.

Summary & Action Steps

To sum up:

• DIY planning has serious risks. Many Australians lack key knowledge; many plans are out of date, under-diversified, or ignore tax/estate risks.
• Before you decide to go it alone, answer those key questions honestly. Know your goals, your knowledge, your risk tolerance, and how much you’re willing to monitor and learn.
• Use a structured plan (checklist) to cover all important areas: investments, tax, estate, protection, insurance, etc.
• Take small steps: educate yourself, use templates wisely, don’t leave will or insurance unaddressed.
• Seek professional help when complexity, risk, legal requirements exceed what you can comfortably understand or manage.

References

Below is a list of the sources used.

1. Preston, Alison; “Financial Literacy in Australia: Insights from HILDA Data” (2020) – UWA Business School – shows 63% of men and 48% of women correctly answer basic financial literacy questions; correlation with super balances, satisfaction etc. (api.research-repository.uwa.edu.au)
2. Findex – “Financial advice and the cost of doing it yourself” – discussion of what self-investors often overlook (tax, estate, retirement strategies, diversification). (findex.com.au)
3. InvestBlue – “DIY Finance vs. Expert Advice: What’s Worth it?” – common pitfalls like under-diversification, failing to adjust portfolios as life changes. (investblue.com.au)
4. Vanguard / Natixis / The Australian “Retirement Income”‐style reports – gap between retirement expectations and reality; worries about inflation etc. (The Australian)
5. ASFA survey – “One in two Australians have never accessed information on preparing for retirement” – showing low engagement with formal advice or retirement planning information. (ASFA)
6. Ballantine Law / estate-planning blog posts – common estate planning mistakes, problems of DIY wills, failure to update, failure to account for non-estate assets etc. (ballantinelaw.au)
7. Research on number of Australians without current wills (≈40%) – Ballantyne Law “7 Common Estate Planning Failures” etc. (Ballantyne Law)