Update your numbers regularly. Some expenses, like utilities, are dynamic and may increase or decrease over time.
Pay attention to fees. For example, if you get paid $150 for a side gig via a mobile app but incur a $10 transaction fee, account for that.
When you calculate costs, include interest if you used a credit card to buy it. If you buy a $40 shirt using a credit card that's accruing 20% interest, the true cost may be more if you don't pay your card in full at the end of the month.
Key reminders when tallying expenses:
