「何してるの？」「家計簿をね。うちの家計カチカチだから、こういう所からちゃんとしないと」

tbd

"What're you doing?" "The household books. Our finances are pretty tight so we have to do things properly."

妻が家計簿をつけています。

tbd

My wife keeps track of our finances.

My wife keeps the household accounts.