Synthetic example. Review aid, not professional advice; the reviewer decides the GST treatment.
Input: $1,100, assumed wholly taxable and GST-inclusive at 10%.
Open Ozzit v3.4.2 in Microsoft 365 or Excel 2024 or later. No add-ins or macros.
=oz.GSTExtractλ(1100)
Output: $100.00 GST, reproduced in Microsoft 365. The hand calculation is $1,100 / 11.
Human decision: Does the evidence establish that the whole supply is taxable?
Captured in Microsoft 365 using Ozzit v3.2.0, Australian tax!A19:B19; the reviewer still decides whether the supply is taxable.
Setup, function catalogue, workbook examples and reference
A library of 133 native Excel LAMBDA functions plus 5 named help tables for dynamic-array financial models, with inline help and editable demonstration worksheets under the oz. prefix. LibreOffice and older Excel versions cannot evaluate the functions.
The 6 September 2026 capture used Excel 16.0 build 20326. The released workbook opened without a repair prompt and a full calculation rebuild returned numeric 100 for the displayed formula.
v3.2.0 release asset SHA-256: 13df5eb0e2e7a3d1b17a743a990c30adfd187d409be133996ec154543e78ff28.
The capture record and PowerShell reproduction preserve the Excel command, returned value, crop and image fingerprint.
The screenshot uses a disposable copy with a synthetic label, an explicit argument in B19 and currency formatting. It certifies this example in v3.2.0. The v3.4.2 workbook is a different file; its full native gate results are recorded in its release notes and in CHANGELOG.md. The shipped workbook was not edited.
- Open, copy functions and use modern Excel
- Modules, worksheets and formula walkthroughs
- Australian conventions and lease modelling
- Separate 13-week cash-flow template
- Comparing a modelling schedule with an accounting carrying amount
- Function index and source views
The tagged repository release is v3.4.2, dated 16 September 2026; citation metadata is in CITATION.cff.
v3.4.2 ozzit.xlsx SHA-256: cc52d7faa43ba672c56cd2f6ff7588f8565d825908cfcca3fc2ead5ce9b6b350 (443,674 bytes), the same file as the tracked ozzit.xlsx on main, whose digest is pinned in release/workbook-base.json and checked by the tool tests. Excel 16.0 build 20430 on 16 September 2026: 1,129 formulas recalculated with 0 in error, 905 self-test assertions with 0 failures, 19,444 cached values equal to what their formulas produce.
MIT licensed. See LICENCE and ATTRIBUTION.md for provenance and licence.