Meaning & usage
It expresses that an action is nothing more than what is stated, often to downplay motive or to present an action as a fallback when no better option remains. It attaches to the plain form of a verb, with the past form like したまでだ or したまでのことだ meaning merely did something, while the non-past must keep のこと as in するまでのことだ. The tone is formal and often defensive, so omitting のこと in the non-past leaves an ungrammatical pattern.
Example sentences 4
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私はただ因習に従ったまでだ。
I just followed convention.
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私はただ彼の意見をそのまま言ったまでだ。
I just echoed his opinion.
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上司に言われたことをしたまでだ。
I just did what my boss told me to do.
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私はただ、当てずっぽうを言ったまでだ。
I said so only by guess.
In past JLPT papers
This came up in 1 past exam question.