Use the 50/30/20 rule to allocate your after-tax income into needs, wants, and savings.
Popularized by Senator Elizabeth Warren, the 50/30/20 rule divides your after-tax income into three buckets: 50% for needs (essential expenses you can't avoid), 30% for wants (discretionary spending), and 20% for savings and debt repayment. It's simple, flexible, and works for most people. If your needs exceed 50%, look for ways to reduce housing costs or increase income.