Controls and correcting closed periods
Objective: Explain basic bookkeeping controls and post-close corrections.
Recommended first: Closing entries
Simple controls
- Separate who records, who approves, and who handles cash where possible.
- Approve bills before payment.
- Lock closed periods.
- Keep an audit trail: never delete posted entries.
If an error in a closed period is found, record a correcting entry in the current open period and document it. Material prior-period corrections have specific reporting rules beyond this course.
Controls do not need to be complicated to be useful. Even in a very small business, having someone other than the bookkeeper review the bank reconciliation, or requiring approval before payments, reduces the chance of errors and fraud going unnoticed. Documented corrections keep the audit trail intact.
Check your work
- Is there separation between recording, approving, and paying?
- Are closed periods locked?
- Is every correction documented with a reason?
A $300 March expense was missed; March is closed. Record it in April with a note.
| Account | Debit | Credit |
|---|---|---|
| Utilities Expense | $300.00 | |
| Accounts Payable | $300.00 |
Common mistakes
✗ Reopening and editing a closed period silently.
✓ Correct in an open period with documentation.
Guided practice
Use hints freely here.
Item 1 of 1
Record an omitted invoice
On Mar 29, 2026, FixRight Appliance Repair finds invoice #R-77 for $235.00 of repairs done this month that was never entered. Record it now (it is still the same month).
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Independent practice
Try these without hints. Completing the lesson needs at least one independent item solved without revealing the answer.
Item 1 of 4
Reverse a duplicated bill
On Mar 18, 2026, BrightNest Cleaning Co. finds that a $180.00 supplies bill (Dr Supplies / Cr Accounts Payable) was entered twice. Record the entry that removes the duplicate.
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References and provenance
- OpenStax, Principles of Accounting, Volume 1: Financial Accounting (accessed 2026-10-29)
Original lesson written for Bookkeeping Exercises (AI-assisted drafting). Calculations are verified by the platform's automated accounting tests. Not yet reviewed by a credentialed accountant. Updated 2026-10-29.