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First of all - you send all paperwork via certified mail - and keep your receipt.
When you put all documents together - attach a cover letter and list all documents and number of pages for each document.
In additional - you may fax all documents to the revenue agent - in teh fax receipt - there will be number of pages.
You will not be able to stop the Collection process while the Offer in Compromise will be considered and teh debt is not fully settled.
However - the IRS has the authority for reporting accounts currently not collectible status. (CNC). Accounts can be removed from active inventory after taking the necessary steps in the collection process.
As a general rule, accounts will be reported as currently not collectible when the taxpayer has no assets or income which are, by law, subject to levy.
However, if there are limited assets or income but it is determined that levy action would create a hardship, the liability may be reported as currently not collectible. A hardship exists if the levy action prevents the taxpayer from meeting necessary living expenses. In each case a determination must be made as to whether the levy would result in actual hardship, as distinguished from mere inconvenience to the taxpayer.
Please see for reference - the IRS Policy Statements for Collecting Process Activities - http://www.irs.gov/irm/part1/irm_01-002-014.html