sum payment payable to the extent available under the plan. (vi) Phase-out of exception In the case of an employee whose aggregate balance described in clause (i) as of a measurement date exceeds the dollar amount in effect under such clause by less than $10,000, the required distributions under this paragraph for calendar years beginning after such measurement date and before the next measurement date shall be equal to the amount which bears the same ratio to the required distributions otherwise determined under this paragraph as— (I) the amount by which such aggregate balance exceeds such dollar amount so in effect, bears to (II) $10,000. (vii) Cost of living adjustments The Secretary shall adjust annually the $250,000 amount specified in clause (i) for increases in the cost-of-living at the same time and in the same manner as adjustments under section 415(d)