Side hustle income arrives in bursts: a big month, a quiet month, a late payment. That irregularity makes investing it feel complicated, so many people leave it sitting in a checking account, where it slowly gets spent. But a simple percentage-based system can turn irregular income into steady investing without any monthly guesswork.

The core idea is to treat every payment the same way, regardless of size: split it by fixed percentages the moment it arrives, so investing happens automatically in good months and pauses gracefully in lean ones.