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Every time money is exchanged, it has to come from somewhere and it has to go somewhere -- that's two places it need to be recorded (or "entered in the books"). Money can not be created out of thin air, and it can not be destroyed. Every movement of money has to be accounted for, which is why it's called "accounting". Double-entry accounting means you have to account for where the money comes from, and you have to account for where it goes, and each of those is a separate entry and it all has to add up to zero. Where it can become confusing is when money leaves you or comes in from an external source. There are still two entries, but one entry is in one party's books and the other entry is the other's. For example, I get a paycheque and I enter my income in a little book with green paper and DB/CR columns. At the same time, my employer has entered an expense in their book. Double entries. |
I agree with your first two paragraphs but not with this last one. When money leaves you or comes in from an external source, there is always some proxy account for that external party in your own books. And the whole situation is mirrored in the accounting system of the external party (unless they are a consumer). Each party records two entries.