Antonyms for the phrase "current monthly income" can be words that describe the opposite of income, such as "expenditure," "debt," and "liabilities." Other antonyms can be words that refer to non-regular or non-recurring income, such as "bonus," "windfall," "dividend," or "inheritance." Finally, the opposite of "current monthly income" can be interpreted as the absence of income altogether, such as "unemployment," "retirement," or "pension." It's important to keep in mind that antonyms of a phrase depend on the context and meaning of the phrase itself, and that they may vary depending on the language or region in which they are used.