Start with the source register
List the relevant period and the documents supporting each type of transaction. Keep a customer receipt separate from an account transfer and an expense record, even when they share a date or amount. A working summary should point back to this register so another reader can locate the evidence without reconstructing the whole envelope.
Keep uncertainty out of the confirmed total
If an entry has no clear source or purpose, flag it for review. Explain any preliminary estimate and preserve the records used to make it. Do not turn an unclear deposit into confirmed income or a purchase into an accepted deduction merely to finish the worksheet. Those classifications may require more evidence and qualified interpretation.
Connect the summary to the account task
Bring the relevant return or notice alongside the financial records. Explain which year and question the summary is intended to address. Keep current-year responsibilities separate from work on an older balance. Ask who would review the figures, what additional documents are needed, and how any proposed preparation or submission would be recorded. Retain the original register and the version actually used.