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Five bookkeeping mistakes that cost you at tax time

Avoid the most common small-business bookkeeping mistakes before tax time, from late reconciliations to missed super deadlines.

Published 1 July 2026

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If you run a small business, these are the bookkeeping mistakes we see most often.

1. Reconciling late

Leaving reconciliations until the last minute means errors compound and cash flow visibility disappears.

2. Mixing personal and business spending

Blurred lines make tax time painful and put deductions at risk.

3. Ignoring superannuation deadlines

Late super is not deductible and attracts penalties. Set reminders well ahead of each due date.

Fix these before the end of financial year and you will save time, stress, and money.

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