About James O'Brien
James O'Brien is a CPA (CPA Australia member) and registered tax agent with over 14 years of experience in Australian tax compliance and planning. Based in Melbourne, he advises individuals, investors, and small business owners on capital gains tax, PAYG withholding, income tax optimisation, and HECS-HELP debt management. James has worked extensively with ATO public rulings and Tax Determination documents, ensuring all advice aligns with current law. At CalcPhi, he is responsible for verifying all Australian tax calculator logic against ATO published rates, Tax Office legislation, and Federal Budget updates. His content is updated within 7 days of any ATO or Budget announcement affecting income tax, CGT, or withholding rates.
Articles by James O'Brien
- Australia Income Tax Brackets 2026-27: What Your Salary Actually Costs in Tax
- Capital Gains Tax on Property Australia: What You Actually Pay
- HECS-HELP Repayment Guide 2026: Thresholds, Rates, and Paying It Off Faster
- How to Legally Reduce Your Tax Bill in Australia: 10 Strategies for 2026
- Franking Credits Explained: How Dividend Imputation Works in Australia
- Negative Gearing Australia 2026: What It Actually Means and Who Benefits
- Australian Shares vs Property: Which Investment Wins Long-Term?
- ETFs vs Managed Funds Australia 2026: Which Delivers Better Returns?
- Dollar Cost Averaging vs Lump Sum Investing: What the Data Says for Australian Investors
- FIRE Movement Australia: Financial Independence, Retire Early Guide 2026
- Dividend Investing on the ASX: High-Yield Shares, Franking Credits and Strategy
- SMSF Australia: Is a Self-Managed Super Fund Worth It in 2026?
- Super Death Benefits Australia: What Happens to Your Super When You Die?
- Conveyancing Australia Guide: What It Costs and What Your Conveyancer Does
- Interest-Only Home Loans Australia: Who They Suit and What They Really Cost
Editorial Independence
All content produced by James O'Brien for CalcPhi is editorially independent. Calculator results and written content are never influenced by advertising relationships or affiliate commissions. All rates and regulatory figures are sourced directly from ATO, APRA, ASIC, RBA, or Services Australia publications. See our editorial standards for full details.
Approach to Financial Guidance
James O'Brien approaches every article by asking: what does a financially literate reader actually need to make this decision with confidence? That means going beyond regulatory definitions to explain practical implications — who benefits, who doesn't, and what the numbers look like across typical income and wealth levels.
All figures are cross-checked against the ATO's individual tax rates schedule, APRA's quarterly statistics, and ASIC's MoneySmart guidance before publication. Super balance projections account for the contributions tax, the earnings tax inside accumulation phase, and the correct concessional cap for each financial year — not simplified approximations.
Mortgage and property content uses actual reducing-balance amortisation, correctly accounts for the APRA serviceability buffer in borrowing capacity estimates, and models offset account savings using the daily interest calculation method used by Australian lenders.
All CalcPhi articles authored by James O'Brien are reviewed by a second qualified team member before publication. Regulatory figures are updated within 48 hours of any relevant notification or rate change.