TN 25 (11-96)

# RS 00605.017 Base Years, Computation Years, and Divisor Months Under the 1978 NS Method

## Definitions

### 1. Base Years

The available years from which the earnings to be used in computing a PIA are selected.

#### a. RIB and DIB Computations

Initial computation - years after 1950 up to the year in which the first month of entitlement to benefits occurs (for a detailed explanation of DIB base years, see RS 00605.210).

Recomputations - year in which the first month of entitlement occurs and later years (see RS 00605.501).

**Note**: The year of effective filing (GN 00204.007) is never a base year in the initial computation of a RIB or DIB.

#### b. Survivor Computation

Years after 1950 through the year of death.

#### c. Base Year Exclusions

Years wholly within a period of disability may or may not be used, depending on whether the period of disability is disregarded for computation purposes; i.e., a DIB freeze (exclusion) or DIB nonfreeze (nonexclusion) computation.

### 2. Computation (Comp) Years

The base years having the highest indexed or unindexed earnings and equal in number to the elapsed years less drop-out years. Where the result is less than 2, it must be raised to 2.

### 3. Drop Out Years

In all retirement and survivors computations and computations for DIB entitlements before 07/80, the number of drop out years equals 5. For DIB entitlements after 06/80, see RS 00605.230 and RS 00605.235 to determine the number of drop out years.

### 4. Divisor Months

The number of months in the computation years.