Comment by ojbyrne

Slight amendment. It's actually a little worse than you describe. Like a machine, if this is amortized over 5 years, it's subject to the "half-year convention" - the assumption is made (to keep things simple) that the engineer is hired at the exact midpoint of the year.

So for your example of a $200k salary amortized over 5 years, you can only deduct $20k the first year, then $40k, $40k, $40k, $40k, and then the final $20k in the sixth year.