Odd Net Income behavior
When Mint calculates Income and Expenses for Net Income, it doesn't seem to handling credit card returns/credits properly.
For example, I made a $2,000 purchase order (Furnishings category) on a credit card earlier this month and then cancelled the order three days later, $2,000 credit (Furnishings category) back on the credit card. The Budgets pages correctly recognize that these two transactions cancel each other out; net $0. The Net Income page treats both transactions as expenses, so they don't cancel one another. Net of the two transactions: $4,000 expense.
Categorizing the second transaction as "Credit Card Payment" doesn't help. That would mess up the Budgets calculation and still not fix the Net Income Expenses calculation.
Categorizing the second transaction as "Income" doesn't seem right, as it's not income. Yes, that would fix the Net Income calculation, but breaks the Budgets calculation.
I believe the correct behavior would be for the Net Income/Expenses calculation to allow the two transactions to cancel out.*
*Putting on my software developer hat, don't take the absolute value of each "expense" transaction when adding them up. Let the expense credits negate the expense debits. This would also properly handle a $10 return against a $100 purchase.