Exhibit 99.13 MBNA MASTER CREDIT CARD TRUST II SERIES 1996-K KEY PERFORMANCE FACTORS April 30, 2001 Expected B Maturity 11/17/03 Blended Coupon 5.2042% Excess Protection Level 3 Month Average 7.74% April, 2001 7.58% March, 2001 8.15% February, 2001 7.49% Cash Yield 19.61% Investor Charge Offs 4.98% Base Rate 7.06% Over 30 Day Delinquency 4.89% Seller's Interest 9.33% Total Payment Rate 13.70% Total Principal Balance $58,171,313,434.78 Investor Participation Amount $1,000,000,000.00 Seller Participation Amount $5,425,622,873.29