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In .NET there are 8 bytes of overhead for each object. 4 bytes are a pointer to the object’s type. What are the other 4 bytes, known as the object header, used for?
Note: the question was asked in 2010 and is 32 bit specific. The overhead is bitness dependent: 1 pointer-size for the “object’s type” (method table) and 1 pointer-size for the object header. So, that’s 2*4 bytes for 32 bit and 2*8 bytes for 64 bit applications.
This article discusses a lot of internals, including what goes into each object instance. Basically, it’s the type information and a syncblock pointer (because ever object can potentially be locked upon)