Create a personal budget using the 50/30/20 rule with income allocation, category tracking, donut charts, and savings goals.
The tool applies the 50/30/20 rule to the income you actually take home: 50 percent for needs, 30 percent for wants, 20 percent for savings and debt repayment. You enter your net monthly income and your spending in the three categories; the planner computes each target, flags where your real spending diverges from it, and renders the split as donut charts. A savings goal section checks whether the 20 percent slice will reach your target by a chosen date. The surprise most users hit: the rule runs on after-tax income, so taxes must already be out before the split starts.
A concrete input and expected output from the current implementation.
Input
Take-home pay: $4,000/month. Needs spent: $2,000. Wants spent: $1,100. Saved: $900.
Expected output
Targets: needs $2,000 (50%), wants $1,200 (30%), savings $800 (20%). Actual: needs $2,000 (50%, on target), wants $1,100 (27.5%, $100 under target), savings $900 (22.5%, $100 over target).
Each target is the after-tax income times its rule share: $4,000 x 0.50, 0.30, and 0.20. The $100 the user did not spend on wants is what shows up as the surplus in savings, so the two deviations mirror each other.
You enter net monthly income plus what you spent in each of the three categories. The planner multiplies income by 0.5, 0.3, and 0.2 to get target amounts, then compares each category's actual spending against its target and shows the gap as a dollar and percentage difference. Deviations always sum to zero: money not spent in one category necessarily appears as a surplus in another.
You state a savings goal, say $6,000, and a target month. The planner checks whether the 20 percent slice of your income, saved monthly, reaches that amount in time, and shows the shortfall if it does not. It also lets you try a larger allocation or a later date and see the projection change.
No. It is a widely used guideline from Elizabeth Warren and Amelia Warren Tyagi's 2005 book, not a standard with any force. In high-cost cities, with student loans or caregiving expenses, needs can exceed 50 percent of take-home income, and the honest answer is that some households cannot meet the split without changing their situation.
Convert it to a monthly figure before entering it: $100 a month in the needs category, for instance. The tool works on a monthly basis, so a single lumpy expense entered in its payment month will make that month look far off target and every other month look artificially clean.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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