Vähennettävyyteen
Vähennettävyyteen is the illative case form of the Finnish abstract noun vähennettävyys, which expresses the property of being reducible or deductible. The base concept comes from the verb vähentää (to reduce, to deduct) with the suffix -ettävyys forming a noun that denotes a quality or characteristic, here the reducibility or deductibility of something. The illative suffix -een is added to form vähennettävyyteen, indicating “into reducibility/into deductibility” or, in Finnish usage, movement toward the concept.
In usage, vähennettävyys is most common in tax- and accounting-related contexts, where it describes whether costs,
Notes: It is a grammatical form of a broader linguistic phenomenon in Finnish—the use of the illative