Retirement tax questions

Let me restate my question:  I have been an annuity from the Office of Personnel Management for several years.  For calendar year 2021 the form 1099R states a follows: 

Box 1 Gross distribution-$43,704.00

Box 2a Taxable amount-UNKNOWN

Box 4 Federal Income Tax Withheld-$1,861.20

Box 5 Employee Contributions/Designated ROTH Contributions or Insurance Premiums-$7271.56.

Box 7 Distribution Code(s)-NONDISABILITY

Box 9b Total Employee Contributions-$33,940

Box 14 State tax withheld-NONE

Box 14 State tax withheld-NONE

Other boxes left blank.

Hence, the basic question becomes: Is the taxable amount as listed in Box 1 or is it some other figure?

If this exceeds your vaunted tax capabilities, please advise so that I can find qualified assistance elsewhere.