(1) Social security benefits which are based on the earning record of either parent shall be considered in establishing new support orders or modification of existing orders under the following conditions:

(a) benefits received by the parent on behalf of the minor child are not to be included in that parent's gross income;

(b) the parent's obligation is satisfied if the amount of the child's benefit received for a given month as a result of that parent's earning record is equal to or greater than the parent's child support obligation. Any benefit received by the child for a given month in excess of the child support obligation is not treated as an arrearage payment or as future support;

(c) the parent must pay the difference if the amount of the child's benefit for a given month is less than the parent's child support obligation. This amount is presumed to be paid if the child resides with that parent a majority of the time; and

(d) whenever either parent receives for the benefit of the child, a lump sum payment which represents an accumulation of monthly benefits:

(i) the lump sum payment should not be treated as income of the parent; and

(ii) the lump sum should be credited to that parent's child support obligation for each month a payment accumulated for the child's benefit.