Monthly Budget
Planner
Build your monthly budget using the 50/30/20 rule or fully custom categories. See instantly where your money goes, whether you have a surplus or deficit, and how your spending compares to recommended targets.
| Category | Monthly | Annual | % of Income |
|---|
The 50/30/20 rule explained
Popularised by Senator Elizabeth Warren in her book "All Your Worth," the 50/30/20 rule divides after-tax income into three buckets: 50% for needs (housing, food, utilities, minimum debt payments), 30% for wants (dining, entertainment, subscriptions), and 20% for savings and extra debt repayment. It's a starting framework, not a rigid law — high cost-of-living cities often require adjusting needs to 60%+.
When 50/30/20 doesn't work
If your rent alone exceeds 40% of take-home pay — common in cities like NYC, SF, or LA — the rule becomes impractical. In that case, focus on the savings number: protect the 20% first, then split the remainder between needs and wants as best you can. A 60/20/20 split is a reasonable urban adaptation.
The real power: annual projection
A monthly surplus of $300 feels small. But $300 × 12 = $3,600 per year. Invested at 7% for 30 years, that's over $340,000. The annual and long-term view of your budget is what transforms budgeting from a chore into a motivating exercise.
What to do with a surplus
Priority order: (1) Build a 3–6 month emergency fund first. (2) Get any employer 401(k) match — it's a 50–100% instant return. (3) Pay off high-interest debt (above 7%). (4) Max your IRA ($7,000/year in 2024). (5) Invest the rest in a low-cost index fund. Don't skip to step 4 before completing step 1.
Alex earns $5,000/month after tax working in a mid-sized US city. Here's how a well-structured 50/30/20 budget looks, and where Alex's actual spending falls.
| Category | Target (50/30/20) | Alex's actual | Status |
|---|---|---|---|
| Needs (rent, utilities, groceries, transport) | $2,500 (50%) | $2,450 (49%) | ✓ On target |
| Wants (dining, entertainment, subscriptions) | $1,500 (30%) | $1,800 (36%) | ⚠ Over by $300 |
| Savings & debt payoff | $1,000 (20%) | $750 (15%) | ⚠ Under by $250 |
| Monthly surplus/deficit | $0 | -$0 (balanced) | Balanced |
Alex is $300 over on wants and $250 under on savings. The fix is simple: reduce dining out by $300/month and redirect it to savings. Over a year that's $3,600 more in savings with no lifestyle disruption.
Pay yourself first
Set up an automatic transfer to savings on payday before you can spend it. When savings comes out of your account automatically like a bill, you adapt your spending to what's left — not the other way around.
Track spending weekly, not monthly
Monthly reviews are too late — you've already overspent. A 10-minute weekly check lets you course-correct mid-month. You don't need an app: a simple spreadsheet or even a notes app works fine.
Budget for irregular expenses
Car registration, annual subscriptions, holiday gifts, and medical copays aren't monthly but they are predictable. Divide them by 12 and add a "sinking fund" line to your monthly budget. This eliminates most "budget-breaking" surprises.
Give every dollar a job
If you have a surplus in your budget, assign it — extra debt payment, a travel fund, an investment. An unassigned surplus gets spent. Zero-based budgeting (income minus all allocations = $0) is the most powerful framework for this.
Build a complete monthly budget using the proven 50/30/20 framework.