Yes, this will increase your 1099-R because it increased your length of service. The portion of your payment(s) that is not taxable is shown in Box 5 of the 1099-R. It is this amount that the IRS considers a return of your previously taxed contributions. If you have questions regarding the taxable amount, I suggest you contact your plan administrator.
Waiting time can help establish retirement eligibility. Waiting time can also increase your benefit under the Full Formula and Formula Plus Annuity benefit calculation methods. Both of these methods base part of your benefit on your length of service, and would be reflected in your 1099-R. Since the waiting-time purchase counts as creditable service, it would give you more service time in the benefit formula. The employee contribution portion of the purchase cost also increases your account balance
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