Here are the journal entries to record the corrections and changes at December 31, 2020:
1. Incorrect recording of equipment purchase - the $12,000 equipment actually purchased on 12/31/20.
Debit Equipment $12,000
Credit Accounts Payable $12,000
2. Unrecorded sale of land - the company sold land with a book value of $25,000 for $42,000 cash.
Debit Cash $42,000
Debit Gain on Sale of Land $17,000
Credit Land $25,000
Credit Accumulated Depreciation $8,000
3. Unrecorded expense - prepaid insurance expense of $3,000 expired on 12/31/20.
Debit Insurance Expense $3,000
Credit Prepaid Insurance $3,000
4. Understatement of depreciation in prior years - additional depreciation of $10,000 should have been recorded in prior years. The tax effect is $4,000.
Debit Accumulated Depreciation $10,000
Debit Deferred Tax Asset $4,000
Credit Provision for Income Taxes $4,000
5. Collection received on 12/31/20 but not recorded until 1/2/21 -
Debit Accounts Receivable $5,600
Credit Cash $5,600
The net income effect of the above corrections is to increase net income by $11,000.
Please let me know if any additional explanations or details are needed.