Beneficial Corp. reported first-quarter  earnings of $187.5 million, or $3.34 per share, up 86% from a year   earlier, largely on the sale of a Canadian subsidiary.   
The earnings, partly offset by a $7.7 million addition to tax  reserves, were the highest for any quarter in Beneficial's   history.   
  
Included was a gain of $110.8 million, or $1.99 per share,  from the sale of its Canadian consumer finance subsidiary to   Associates First Capital Corp.   
The results were achieved despite a fall in net after-tax profits of the  company's tax refund anticipation loan business, to $25.6 million ($42.6   million pretax), from $42.1 million ($70.1 million pretax) a year earlier.   This was caused by Internal Revenue Service-delayed payments to some   taxpayers claiming an earned income tax credit.       
  
Beneficial said it is likely that some additional refund loan profits  will be recorded this year, but full-year earnings in this area are   expected to be about $50 million pretax, compared with $73 million   pretax for 1997.     
Discounting the Canadian gain-on-sale, the addition to tax reserves, and  the full impact of refund loan profits in both years,   earnings declined 13%, chiefly reflecting an increase in the loan-loss   reserve percentage.