That corner you cut on the project will show up as a crack in something bigger.

Shortcuts do not vanish, they get built on. What you skipped becomes the base for the next piece, and the failure usually surfaces somewhere unrelated and much later, which makes it hard to trace back to the afternoon you saved twenty minutes. That delay is what makes cutting feel free while you are doing it.

Think about the part of your current work you are hoping nobody inspects. Go back and do that bit properly before anything else is stacked on top. It will never be cheaper than it is right now.