That title goes against generally-accepted wisdom ---but hear me out. Say you need to shell out a large amount of money (say $10,000 for example) & you want to pay cash so there will be no credit card bills or finance charges. Instead charge it to your cash-back credit card. WIth 1% cash back, you'll get $100 back. In addition, your $10,000 can earn interest for an extra month until the credit card bill arrives. Interest rates are low now, but even at 1% you will...... (click title for more info.)
...earn about $8 in a month. If you pay the credit card bill in full, you'll save or get back $108. If you spend only $1000, you'll still save about $10.80. It adds up over time. You MUST pay the bill in full each month to benefit, otherwise finance charges will wipe away your savings & more.