"My bank balance is really low so this month is really tight."
- "My bank balance is really low so this month is really tight."
"my bank balance" 「私の口座残高が」
"is really low" 「とても残り少なくて」
"this month" 「今月」
"really tight" 「マジ厳しいです」"really" の代わりに "seriously" も使えます。