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I'm going to send you to an accountant, or maybe the Turbotax Live service. You have a problem.
You say you had "no interest", but you were a co-owner, and received 20% of the profit. Obviously you did have an interest.
If you were a co-owner with no specific ownership percentage listed in the deed as filed with the county, then you will be assumed to be an equal owner with the other owners (50/50, or 1/3, 1/3, 1/3, etc.) and the IRS will view you as responsible for that percentage of the tax. (And, seeing that the 1099-S is in your name, they will likely see you as the only owner and responsible for all the tax.)
You do owe, at a minimum, capital gains tax on 20% of the gain. Your cost basis is the original price minus the rental depreciation. Your gain is the sales price minus the cost basis. The gain is taxed at 25% for depreciation recapture, and 15% for long term capital gains over the recapture amount.
Since you never reported owning the property, you probably don't know anything about depreciation, or rental expenses. Did the other owner live there as a personal residence, or did the other owner rent it out and take care of the paperwork? You likely need to see lots of documentation from the other owner (past tax returns, depreciation schedules, etc.)
Without the documentation, you can't prove your basis and if audited, you may be assessed income tax on the entire sales proceeds.
So, get to an accountant or enrolled agent, and hopefully the other owner will cooperate with documents.
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