If it is a single member LLC than you do not need to file a separate tax return. A single member LLC is a disregarded entity and you can file the taxes for the LLC on your Sch C (Personal tax return).
Let me know if you have any question.
Please note: This advice is provided with the understanding that all the relevant facts have been provided by you. Any change in facts might affect the advice given and hence may not be relied on in such cases. Nothing contained in this reply was intended or written to be used, can be used by any taxpayer, or may be relied upon or used by any taxpayer for the purposes of avoiding penalties that may be imposed on the taxpayer under the Internal Revenue Code of 1986, as amended.
You need to report the LLC activity on Sch C if this is an active business entity. You can provide the entity EIN on Sch C and claim any loss from the business activity on Sch C.
What kind of business was carried on?
Any investment made such as right purchased, assets-fixtures, equipments etc will need to the capitalized and depreciated over a period of time. You can claim section 179 write off to write off the entire investment but only if you have sufficient income from the activity. Sec 179 expense is limited to the Business income.
If this is a first year and you are not familiar with these issues than I would suggest you have a tax professional prepare your tax return.