An application for Social Security benefits can be withdrawn or suspended, depending on the beneficiary's age and length of time since the initial application.
An application for benefits can be withdrawn within twelve (12) months of the initial filing. This process is permitted only once in your lifetime and upon approval all benefits received prior to the withdrawal of application are due in full. The individual will need to complete Form SSA-521 to begin the process.
A voluntary suspension can be requested if your client is at least Full Retirement Age. There is no time restriction from the initial filing date and no benefits are repaid. This will allow your client to accrue Delayed Retirement Credits (DRCs) through age 70 or until he or she reinstates their benefits, whichever comes first. There is no form required to request a voluntary suspension. It can be done in writing, in person at your local Social Security Administration (SSA) office, or over the phone by calling the SSA at 800.772.1213.
References:
Requirement for Withdrawal (WD) Request