When you pay your credit card, it clears the balance on a first in first out basis. So if I spend 1k today then 1k in 30 days time, I only have to pay 1k to cle

When you pay your credit card, it clears the balance on a first in first out basis. So if I spend 1k today then 1k in 30 days time, I only have to pay 1k to clear the statement balance and avoid paying interest.