The 50/30/20 rule divides your take-home pay into roughly 50% for needs, 30% for wants and 20% for savings or paying down debt. A budgeting app can categorise your spending, set limits and show whether you are close to those targets each month. It is a guideline rather than a requirement, so you may need to adjust the percentages for rent, childcare, debt repayments or an irregular income. Check the app’s fees, privacy policy and security before linking your bank account, and consider guidance from a regulated financial adviser if you need personalised help.