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"Squatter's rights" is a term for the legal doctrine of adverse possession. It's true that if you possess a property for long enough without permission that you can own it. But the thing is that this is generally a LONG period of time.
As in most states, adverse possession in Montana is established from the nature of a trespasser’s possession and the length of time he or she possesses the land. A trespasser’s possession must be:
- hostile (against the right of the true owner and without permission)
- actual (exercising control over the property)
- exclusive (in the possession of the trespasser alone)
- open and notorious (using the property as the real owner would, without hiding the occupancy), and
- continuous for the statutory period (which is five years in Montana, under Mont. Code Ann. § 70-19-411), and
- be accompanied by payment of taxes for the full five years.
Note that the statutory requirement of payment of property taxes by the trespasser is somewhat unique to Montana. In many states, a trespasser can gain adverse possession even if they’ve never paid a dime of tax money over a decade or more—but not in Montana.
So long as you can possess it for 5 years, hostile to the true owner, and pay taxes on it, then you can lay claim to it. But if not, then there's no case to be made for adverse possession.
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