A side hustle boosts your FIRE savings rate by increasing income, which is often faster than cutting already-lean expenses further.

Choose a hustle that uses skills you already have, so you can earn quickly without a long unpaid learning period.

Freelancing, tutoring, selling digital products, and local services are common options, but the best choice depends on your time and strengths.

Direct side hustle income straight to investments on receipt, before it blends into everyday spending and disappears.

Protect your main job and health by capping side hustle hours and choosing work that does not leave you exhausted every week.