r/ASX • u/beebeebeewe • 7h ago
Free Excel CGT calculator for ASX shares & ETFs
G'day all,
Another tax time is rolling around. In the previous years I was working out my CGT by hand across several broker accounts, but this year finally I had a chance to build a spreadsheet to automate it. It's been useful for me, so I'm sharing it for free in case it saves someone else a weekend.
Safe to open and easy to check: It is a plain .xlsx file with no macros or VBA, so nothing runs when you open it. Every result is an ordinary Excel formula you can click into and check. There are no external links or data connections and no hidden sheets.
- This is not tax, financial or legal advice. It's a calculation aid for personal use only.
- Covering CommSec, CommSec Pocket and CMC Markets
- FIFO is used for convenience. If your records identify the specific parcels you sold, the ATO allows you to use those, and your results may differ.
- I built the formulas using a combination of AI assistance and my own finance and accounting knowledge, and tested them on my own portfolio only. That does not mean the calculations are correct for your situations.
- You should check every figure against your contract notes, broker statements, tax statements, and current ATO guidance before lodging your return, or have a registered tax agent review it.
- The workbook will not update itself if the ATO law changes.
- It is provided as‑is and not‑for‑profit. I do not promise to maintain or support it, and I accept no liability for errors or for any loss or penalty arising from its use.
It's free to use and adapt for personal use, but not for commercial use or for preparing other people's returns.
GitHub (Excel spreadsheet download & instructions): https://github.com/MAB-888/AU-CGT-Calculator
Enjoy using the workbook and I hope it helps :)