You have several tax options that should be explored prior to your departure. You will be required to file taxes when you return home so It is recommended that you contact your bank and an accountant before leaving. They will be very helpful when you are putting your financial affairs in order.
Tax options will depend on factors such as:
How long you have been away
How much money you made
If you paid taxes in your host country
If you claimed non-residency status in your home country
If you have assets such as bonds and properties
If you have dependants
Your marital status
Visit the Finanacial Reminders section of the Preparing to Go Checklist to ensure you have thought about all aspects of your finances prior to your departure.