For the most part, my sinking funds are what I want to have, not need to have. Exceptions are mostly around my car: insurance, license registration, plates, etc. My other sinking funds are things like clothing, vacations, subscriptions, etc. If something else needs to be paid, the sinking funds don't get paid that month. Note: when I figure my sinking fund allocations, e. g., Christmas gifts, I do my math so I'm fully funded by October. That way I'm giving myself a little runway in case I didn't contribute one month earlier in the year - I still won't fall short.