N.Y.C. Admin. Code § 13-522: § 13-522 Contributions of members and their use; annuity reserve fund.

Upon the retirement of a contributor, his or her accumulated deductions shall be transferred from the annuity savings fund to a fund to be known as the annuity reserve fund. His or her annuity shall be paid out of such annuity reserve fund. Should such a beneficiary be restored to active service his or her annuity reserve shall thereupon be transferred from the annuity reserve fund to the annuity savings fund.