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Ultimately, the liability is the responsibility of the remaining partners.
However, if they do not voluntarily comply with the exit agreement, you will have to sue them to force payment.
The IRS, however, is not bound by the partnership agreement. They can pursue you individually until and unless the assessment is satisfied as they were not a party to the agreement. The exit agreement does not shift your liability for taxes during that time, but forces the remaining partners to "indemnify" you.
If they fail to meet that responsibility, then your recourse is to sue them to enforce the exit agreement and get the matter resolved.
You can also ask the court to force the remaining partners to pay your court costs and attorney fees.
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