No, Box 2B should not have "Total Distribution" marked. That would indicate that you took 100% of the account/contract balance. Box 2a and 2b can be confusing. The amount in Box 2a shows the portion of the distribution that is generally taxable. However, the amount that is actually taxable may be different due to any one of several factors, one of which is if it is an annuity payment to which the taxpayer contributed. When box 2b is marked, it indicates that the payer was unable to determine the taxable amount, so it's up to the taxpayer to determine it. That said, the amount in Box 2b may be the correct taxable amount.