When a business is small, the owner sees everything. As it grows, that visibility disappears: more staff, more transactions, more locations, more ways for money to leak. Internal audit is how owners get that visibility back, systematically.
Having led internal audit in the real estate sector, I've seen the pattern repeatedly: the losses that hurt most are rarely dramatic frauds. They're quiet, ongoing leakages, unchecked procurement, unreconciled advances, ghost expenses, that compound for years because nobody was looking.