"At Risk" means that you have more money invested in the property that you rent than you have lossed. For instance, if the property cost you $10,000 and you have deducted losses of $5,000 on it, you would be at risk for $5,000. You cannot deduct losses anymore once your at risk amount is zero. This is a cumulative thing, so you can have losses in several years and still be at risk.
You would only complete form 6198 if you were not at risk in your business, in other words if your amount at risk was reduced to zero.
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