This article exactly gives out how I practice my spendings using credit card. I have 5 credit cards each with a different billing cycle. Ie. 3rd, 9th, 13th, 18th and 27th every month. I use the credit card which is at the start of the billing cycle & keep switching to the next credit card. This way all my spendings have around 40 - 45 days credit period. My average spending per month through credit cards is around Rs. 20000/-. Assuming 5% Rate of interest, I save Rs. 123/- every 45 days. Besides this I also enjoy redeeming reward points. And I dont pay any annual fee as all my cards are lifetime free ones.