You would enter the annuity as received on Form 1099-R. There will be questions following the initial entry to capture your details. What amount has been calculated as taxable will appear in Box 2a.
If this number is in error, then Form 1099-R should be corrected. The IRS receives a copy of government issued forms. Any adjustments must be done by the administrator of the account before the recipient reports them on Form 1040.
For more information, see: When to Use Tax Form 1099-R: Distributions From Pensions, Annuities, Retirement, etc. - TurboTax Tax...
