Since Dec 15, 2015 until now Saturn's position has ranged from 29 Scorpio to 5 Sagittarius. So if you have a planet at the end of fixed signs / beginning of mutable signs ...Saturn's declination in that time period has ranged from 18 - 19 south. It is quite possible you have a planet like Jupiter at that range (if you were born in 1976-77), or natal Pluto (if you were born in the early 1960s) or Sun/personal planets.
But most likely it is from a combination of factors. If you've got anything 11-16 of cardinal signs (Aries, Cancer, Libra, Cap) then Pluto has been hitting that with an angular transit.
Uranus can also play into unexpected expenses when in cooperation with Saturn, Pluto.
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