The components of the deferred tax asset and liability were as follows: No valuation allowance was considered necessary for the deferred tax asset. The tax effect of the unrealized holding gain or loss for securities available for sale was computed based on a 25% capital gain tax rate, and is includ- ed in accumulated other comprehensive income as a part of stockholders’ equity. At December 31, 2001 certain premises are leased with terms expiring through the year 2021. The Corporation has the option to renew or extend certain leases from two to ten years beyond the original term. Some of these leases require the payment of insurance, increases in prop- erty taxes and other incidental costs. At December 31, 2001, the obligation under various leases follows: Rental expense included in occupancy and equipment expense was $4,240,437 in 2001 (2000 - $4,042,069; 1999 - $3,390,786). 72 First BanCorp.> 2001 Note 26 - Commitments >. Year Amount (In thousands) 2002 $ 4,414 2003 3,391 2004 2,645 2005 1,963 2006 1,539 2007 and later years 5,117 Total $19,069 December 31, 2001 2000 (In thousands) Deferred tax asset: Allowance for loan losses $34,732 $29,998 Unrealized loss on available  for sale securities 2,098 6,533 Other 7,110 6,445 Deferred tax asset $43,940 $42,976 Deferred tax liability $ (322 $ (325 ) )