How do I keep my financial reporting clean so audits go smoothly?

You run reporting that's accurate, on time, and clean enough that audits don't rattle you. That's a real achievement, and it's mostly invisible; people only notice reporting when it goes wrong. So notice it yourself. Nothing slipping is the result of your discipline, not luck. The danger at your level is complacency dressed up as confidence. Clean systems stay clean only while someone keeps tending them. Rules change, people change, shortcuts creep in. The steadiness you've built is a practice, not a finished thing. Keep one small ritual: after each close or audit, note the one thing that was tighter than it needed to be, and the one thing that nearly slipped. Fix the second before next time. That's how good stays good.