The 50-30-20 rule is a simple budgeting guideline that divides your after-tax income into three categories: 50% for needs, 30% for wants, and 20% for savings or debt repayment. Needs include essentials like housing and food, while wants encompass discretionary spending like dining out and entertainment. The remaining 20% should ideally go toward building your savings or paying off debt. To implement this rule, start by tracking your income and expenses, then allocate your funds accordingly. Adjust your spending habits as necessary to fit within these percentages, and consider consulting a financial adviser for personalised advice.