At December 31, 2020, Tapper Corporation has a deferred tax asset of $420,000. After a careful review of all available evidence, it is determined that it is more likely than not that $85,000 of this deferred tax asset will not be realized. Prepare the necessary journal entry assuming 

(a) That Tapper does not use a valuation allowance account, 

(b) That Tapper does use a valuation allowance account.