Yes, DISBURSAL is a Scrabble word!

Letter values in Scrabble US: D 2, I 1, S 1, B 3, U 1, R 1, S 1, A 1, L 1.

Is it a valid word?

DISBURSAL is a valid word in the official Scrabble dictionary (US) and the UK Scrabble Dictionary, but not in Words with Friends (ENABLE).

amounts paid for goods and services that may be currently tax deductible (as opposed to capital expenditures)
the act of spending or disbursing money