How do dynamic withdrawal rules like Guyton-Klinger adjust my spending each year in early retirement?

Guyton-Klinger is a set of decision rules that let you start with a higher initial withdrawal (often 4.5-5.5%) and then adjust year to year based on how your portfolio performs. The core mechanic is guardrails: if a market drop pushes your current withdrawal rate above an upper guardrail (say 20% over your target rate), you cut spending, typically by 10%. If a strong market pushes it below a lower guardrail, you give yourself a raise. In flat years you take an inflation bump, but you skip the inflation raise after a losing year. This flexibility lets you spend more than a rigid 4% rule while sharply lowering the odds of running out. It requires the discipline to actually cut when the rules say so. WealthSerene's FIRE Calculator at wealthserene.com/tools/fire-calculator can help you stress-test a variable spending plan.