It's hard to track everything.

We started at the beginning of this month. I was good for a few days in organizing our receipts and such. Then I fell lazy. Yesterday I watched Vanessa sort all of the receipts from the last couple of weeks. They were just piling up.

In any case, it can be a good learning experience to track what you spend. It's probably more in some areas (like trips to the coffee shop) than you imagine.

If you run into the same problem that we did, just spot-check a few areas each week or month.