Two electricians co-own the shop and their K-1s never match what they actually took home
When two owners run a shop together, their operating agreement usually spells out how profit gets split, and it is rarely a flat fifty-fifty once you add guaranteed payments for the partner who runs the field crews, a different split for the partner who handles the office, or a change in ownership percentage partway through the year. If ServiceTitan job costing and the bookkeeping do not track those details cleanly, the math behind each partner's K-1 gets tangled fast.
One partner ends up looking at a K-1 that does not match what actually landed in his bank account all year, and once that happens once, both partners start double checking every number instead of trusting the return.
A K-1 that one partner has already used to file his personal return requires both an amended partnership return and an amended personal return to fix, which typically costs several hundred dollars in additional preparation fees and can delay a refund the partner was counting on by months.