In addition to your records, you should have gotten (or could get) a statement or list of transactions
on the annuity from the company.
If indeed the amounts invested are less than all of the withdrawals from the account then you would have a loss on the investment that you could claim on your income tax
Any surrender charges that apply will not be deductible as part of the realized loss. The surrender charge can be used as an investment expense.
You can include the loss as a miscellaneous itemized deduction
on Schedule A, but only the part of the loss that exceeds 2% of your adjusted gross income will result in a deduction.
If your total contributions are less than your total withdrawals for the contract (not including the surrender charge) you do have income subject to the income tax for the difference. The surrender charge can still be used as an investment expense on Schedule A.
There is, of course, no way to guarantee that any amount of documentation will or will not satisfy an Internal Revenue Service
examiner. But, if you have the complete list of transactions on the account then that is all that you can possibly have.
I hope this helps for reporting the surrender of the nonqualified deferred annuity.