ますってことにする

「上への報告はそうしとかなきゃなんないのよ。ちゃんと成果出てますってことにしとかなきゃ予算が下りないの」

Hi. Could you please explain the underlined part, which uses the pattern ますってことにする? I only know the pattern ことにする, which means "I decide to do something".
Thank you.

zuotengdazuo said:

I only know the pattern ことにする, which means "I decide to do something".

Click to expand...

What you are referring to is "終止形 of verb + ことにする". Incidentally, the verb must be volitional verbs for the meaning "I decide to do something".

って is a colloquial form of という, thus, ってことにする is a colloquial version of ～ということにする. ～ということにする can also mean "to pretend (the fact is not so)" or "to assume", and can also be attached to non-volitional verb, adjective, copula or polite form like your example. Thus, ～ということにする can also have the function of "past form of verb/adjective + ことにする".

Thank you. I see.