The OP asked about depreciating a mobile home, the went on to ask if Section
179 expensing was allowable on a mobile home. There have been quite a few answers to the post, many of which made salient observations. I would like to chime in with something that I have not seen addressed, especially considering the track that the thread seems to be taking.
A recent response seemed to head toward the idea that a Mobile Home, having a TITLE from DMV as opposed to a DEED, may be able to be treated like the rental of a car or truck. Let's take a moment of pause -
There is a difference between a Mobile Home and an RV. Mobile Homes have wheels and axels BUT ONLY for the purpose of getting them to where they will remain for an extended period of time. RVs are built with the express intention of being portable on a regular basis. It takes specialized equipment - much like a small over the road truck often referred to as the Tractor part of Tractor-Trailer - and a specialized driver's license - typically a Class A (for multi-part vehicles with a combined gross vehicle weight OVER 26,000 lbs - to move a mobile home. I have never seen an RV that required anything more than a standard driver's license )though they may be out there).
Sometimes it hard to tell a mobile home from an RV. On the Delmarva Peninsula, and in many other resort areas, there are RV parks where people can leave their 12' campers all year AND there are parks where the unit must be a certain length, have an enclosure around the bottom, and cannot be moved without the consent of the park owner/operator.
I've also seen some 40' "land yachts" that look like they are too big for the road. And I've seen dinky little things that people have lived in for an extended period of time. When my wife and built our last house we lived in a 30' fifth wheel trailer on site while they tore the old house down and built the new house - took about 5 months. In at least on place I'm aware of that 5th wheel would have been big enough for the park to allow it to be permenantly parked and used as a home.
You cannot simply say that just because it has a title instead of a deed that it gets treated as a vehicle and can be subject to Section 179. By the same token, for purposes of the gain exclusion from the sale of a home, a boat qualifies as a home. What I can't tell is whether one could take Section 179 on a boat rented as a home. On the one hand it is NOT real estate so it may be allowed, on the other it is a home and I simply do not know if that alone is enough to exclude the use of Section 179.
What I do know is that you have to look to the use of the item. If the unit in question is parked in a place where homes are generally left for years and years and where an enclosure around the bottom of the unit is set in place, and especially if the wheels and axles are removed then you have a residential rental and Section 179 is not allowed.
But if what you have can be hitched up behind a common pickup truck and moved from place to place, it can take advantage of Section 179. Unless, of course, it is permenantly parked, in which case it converts to the real estate rules.
In certain parts of the country, Delaware comes to mind, if one takes a double wide mobile home and encloses the bottom part with something permenant - like brick or block work, even if that enclosure does NOT support the home (typically a mobile home is set on multiple piers to support the weight) then the owner can "surrender" the title to DMV and the county treasurer will issue a Class III Deed. This effectively changes the item from a registered vehicle to real property.
Hope this helps, Gene E. Utterback, EA, RFC, ABA