The value of excess contributions will be determined separately for each decrement by subtracting 50% of the present value of the benefit definitions included for the decrement from the value of employee contributions at decrement, where the result is not less than 0.  If the amount is greater than 0, the excess is assumed to be paid immediately at decrement as a lump sum. 

The present value of benefits is determined based upon the payment form specified in each benefit definition.  Note that optional forms and post-decrement probabilities are ignored for purposes of excess contributions.  The payment form value will be based upon the underlying liability's assumptions.  Therefore, when valuing the ongoing liability, the ongoing interest rate and mortality will be used, and when valuing solvency liability, the underlying solvency assumptions will be used. (Note that for ongoing mortality, the inactive mortality table specified for vested terminated members will be used for the member mortality, and the inactive mortality table specified for survivor beneficiaries will be used for contingent mortality where applicable).

Contributions will be projected forward using the interest crediting rate specified under the employee contributions category of increase & crediting rates in valuation assumptions, where one option is to Use underlying liability interest rates.   

The calculation of excess contributions can also be performed for participants coded with a status of "vested valued through active".  Note that both benefit definitions and contribution definitions typically should be coded in such a way that future accruals (and contributions) are 0 for the vested participants.

To see the excess contribution results in individual results and output detail by benefit, for each decrement where an excess contribution calculation was performed, there will be a benefit definition named <Excess Contributions>.