When you add a transaction, if the transaction date is set to a future date, this will go to the upcoming payments area. This will not increase your Total Expenses or decrease your Total Account Balance until the date has reached.
To see your upcoming payments, you can toggle the Upcoming Payments switch above the transactions list.
Upcoming Payments view
Upcoming Payments are a handy way of giving you an overview of your periodic bills that will be due soon and you can make sure your have enough cash in your bank account.