Question

This state government department is responsible for collecting things like individual income and estate taxes.

First 2 letters: De

Answer 1

It's Department of Revenue

Answer 2

It would be the Department of income tax that works under the Department of Revenue. They are responsible for collecting tax from individuals, businesses, properties and others. They also audit and collect delinquent taxes, develop tax legislation, locate unregistered businesses, enforce compliance, issue business licences and help with licence renewals