We are an LLC that we treat as a pass through. Are we required to file a quarterly estimated tax return? If so, how do we file a $0 return?

[Opus 17]

You file one tax return for the entire year.  If the LLC has more than one member, you file a form 1065 partnership return for the LLC, which issues a K-1 to each member, and the member puts the K-1 on their personal tax return and pays the taxes.  (The only time an LLC does not have to file a form 1065 is if the only two members are spouses and you live in a community property state.)

So the taxes on the LLC income are really due on each member, not the LLC itself.  And the members do have to pay estimated taxes.  You don't "file" a quarterly return, but you are required to make quarterly payments.  Form 1040-ES can be used to calculate the estimated payment, but you don't send the 1040-ES to the IRS, you keep it for your own records, and only send your payment.  

[cyntthor]

It is just my husband in the company. He hasn't had any income for some time, but keeps the company up and running so he will have something to do when he retires.

The problem we are running into is that the bank is threatening to close the accounts for the business because we cannot provide a tax return for the company.

Any income that he did make years ago was included in our personal tax return as pass through income.

Any idea how we can get the bank to back off?

[VolvoGirl]

What kind of LLC is it?  Is he a Single Member LLC?  Did he elect to be an S Corp?  If he is not a S Corp he probably files it on Schedule C in your personal tax return.  So the business tax return would be the Schedule C.  Has he been filing Schedule C each year?  

A Single Member LLC that is not an S corp is a disregarded entity and is filed on Schedule C in your personal 1040 tax return.  Or what kind of business return did he file years ago that was passed through your personal return?  Did he get a Schedule K-1 for it or a W2?