Antonym of “billable”

I am looking for the opposite of billable; the context would be “billable hours”. A complete example sentence could be

Sorry boss, the work I did from 9 to 10 is “not billable”.

While writing a program, I encountered the technical correct, but somewhat ugly billable_true/billable_false-pair.

I want to rename the first to “billable”, since its truthiness is reflected in the code already. It just leaves me with a very unsatisfying “not_billable” as opposite. While not wrong, I am hoping to find a single word that encapsulates this concept of hours I spent working on something, but cannot or want not put on the bill for some reason.

For the record, I am not a native English speaker, but I cannot even find an antonym in my native language (German). The word I am looking for should be an English word, since all words in the program are English(ish/as far as possible).

I did a quick search through the following sites:

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I did not find any single word describing this concept. I do not mean “slack”, because the time I want to categorize was spent working. It just should not end up on the bill presented to the client. The word could have almost any connotation, but it should not have be too colloquial. It should be something I could tell a coworker without getting fired or reprimanded.

So, what would be the (ideally single-word) opposite of “billable (time)”?


Just to clarify: The domain I want to use the word is timetracking in IT. We have some internal projects, events and such, which are tracked, but not billed, because there isn’t any client. We also have in some client-projects aspects that we do not put on the bill (e.g. internal “sync” meetings that are not wanted/needed by the client). We track these short meetings, because it’s work-time, but it is not something the client needs to pay for.


“Non-billable” is the common term according to some brief research.

Source : Link , Question Author : kronn , Answer Author : SDL

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