What is the 'one-third of raises' rule?

One version of this rule says that with each raise you split the new money into thirds: one third to lifestyle, one third to savings and investing, and one third to extra debt payoff or goals. It's a middle path between banking the whole raise – which feels punishing – and spending it all, which is lifestyle creep. By letting yourself enjoy a real slice, the plan is sustainable, while the other two-thirds keep your savings rate climbing as you earn more. Some people flip the proportions, banking half or more once their lifestyle is comfortable. The mechanics matter: increase your automatic savings and any debt overpayment the same week the raise hits, so only the lifestyle third reaches your spending. The exact fractions are less important than the habit of routing most of every raise toward your future.