If I negotiate permanent alimony with my ex-spouse, does this mean the level of support will be unchanged forever?

No, permanent spousal support is not permanent in that sense. The spousal support payments can be negotiated upward or downward should there be a substantial change in circumstances. For example, should you need additional money for an additional expense, such as medical or health expenses, a hearing can be held to adjust it upward. On the other hand, should you need less, it can be adjusted downward.

If your ex-spouse should suffer a reversal of fortune causing a loss of income, he or she could ask for a downward adjustment due to substantial change in circumstances. This loss of income should be in good faith and not through any fault of his or her own. Your spouse cannot voluntarily lower his or her income to avoid support payments.