Assign every spending category a percentage of income rather than a fixed dollar amount. Automatically scales up or down as income changes.
Variable income earners: freelancers, commission-based workers, seasonal earners, gig economy workers.
List all your spending categories.
Assign each a percentage target. They must total 100%.
Each paycheck, multiply your income by each percentage to get the dollar amount for that period.
Adjust percentages annually as your life and income evolve.