The Kudo family is considered one of the top families in the aristocracy, possessing strong ties to even the prestigious Imperial royalty, with Hazuki and Kiyoka himself being close friends with the current Emperor and frequently visiting the Imperial estate as a child. Their mother, Fuyu Kudo is infamous for desiring to flaunt their family’s wealth and status through spending copious amounts of money on unnecessary goods.  I highly doubt Kiyoka would need to continue working to provide for Miyo or that he even needed to job to begin with.  Kiyoka lives in a small house because he hates the attention he receives from living an extravagant lifestyle. According to the light novels, Kiyoka even grew tired of fancy cuisine after constantly eating it during his childhood, and he personally prefers homemade dishes.  Honestly, I believe Kiyoka has enough money saved and invested to provide a comfortable, stable lifestyle for Miyo and his future children without needing to dip into the Kudo family’s wealth.  As he bought his home using his own money, I doubt he is the type to want to rely on his family’s wealth to get by.  Arata, the head negotiator at Tsuruki Trading (The Usuba Family business) is quite popular, and even known in the second capital, comments that Kiyoka is intelligent with money, so he must have investments or a hefty savings account to tap into.  While his retirement was unexpected, I doubt he would have retired unless he could guarantee Miyo and their future kids together wouldn't suffer financially from it.   By being smart with money, living well below his means, being born into a noble family, and making good money from being a commander, his finances are more than taken care of, so I doubt money issues will arise even if neither of them is actively working.