Open source tools for Australian accountants

Check workpaper packs, explore cash shortfalls and inspect the calculations.

Built by Ryan Duguid, an accountant in Newcastle, NSW.

Last reviewed 4 November 2026.

Compare profit with cash flow

Lumbridge Services is a fictional Newcastle maintenance business. Delay one customer receipt by 45 days and inspect the cash gap in its Excel forecast. The quarter’s profit stays the same.

Excel chart of weekly closing cash after a 45-day receipt delay, showing the cash gap against the assumed buffer — 13-week forecast with one receipt paid 45 days late. Weekly closing cash falls to ($25,160) against a $15,000 buffer, then recovers to $67,320 by December, the same as without the delay. Exported from the supplied workbook in Excel 16.0 on 4 November 2026. Capture record.

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