ShareGate Overcast uses the combination of the Usage and RateCard APIs to get insights into your cloud spending during the month.
Prices are calculated by getting the Price Sheet associated with the Subscription's offer and summing up all of the accumulated units of the meters associated with the Subscription's resources.
Azure Credits, discounts from partner programs (notably Cloud Solution Providers and Enterprise Agreements), Marketplace Charges and Taxes are not included in ShareGate Overcast calculated costs.
Please note that ShareGate Overcast job crawling is running at 4 AM UTC every night. Depending on your timezone it might affect the costs assignation of the current day.