Monthly budget allocation
Split take-home pay into needs, wants and savings, and see how the result compares with the 50/30/20 benchmark. Unassigned income is shown explicitly, because money that is not allocated is the money that disappears.
| Category | Share | Per month | Benchmark |
|---|---|---|---|
| Housing | 28.0% | $1,456 | ≤ 30% is the usual ceiling |
| Food | 12.0% | $624.00 | Needs |
| Transport | 9.0% | $468.00 | Needs |
| Debt payments | 7.0% | $364.00 | Needs |
| Discretionary | 24.0% | $1,248 | Wants ≤ 30% |
| Savings & investing | 15.0% | $780.00 | Savings ≥ 20% |
| Needs subtotal | 56.0% | $2,912 | Target ≤ 50% |
| Unallocated | 5.0% | $260.00 | Available to assign |
Shares are of take-home pay, not gross salary. Using gross income makes every category look smaller than it is.
≤ 50% · housing, food, transport, minimum debt payments
≤ 30% · discretionary spending
≥ 20% · emergency fund, retirement, investing
Σ shares = 100% · anything unassigned is invisible spending
A clear path from inputs to results.
A budget works when every dollar has a destination. This engine groups spending into needs, wants and savings, compares the split with the 50/30/20 benchmark, and shows how much income is still unassigned.
How to use
- Enter monthly take-home pay, not gross salary.
- Set each category as a share of that income.
- Group the categories: housing, food, transport and debt minimums are needs.
- Compare the needs, wants and savings totals with 50/30/20.
- Check the unallocated line — that is the money that tends to disappear.
The formula
Reference: Warren & Tyagi, All Your Worth (2005) — the 50/30/20 heuristic, not a regulatory standard.
Worked example
$5,200 take-home, current allocation
- Take-home pay $5,200.
- Housing 28%, food 12%, transport 9%, debt 7%.
- Discretionary 24%, savings 15%.
- 1
Needs: 28 + 12 + 9 + 7 = 56%, or $2,912.
- 2
Wants: 24%, or $1,248. Savings: 15%, or $780.
- 3
Total allocated: 95%, leaving 5% ($260) unassigned.
- 4
Needs exceed the 50% target by 6 points; savings fall 5 points short.
- 5
Closing the gap needs $312 more to savings, funded from wants or housing.
Needs 56% · wants 24% · savings 15% · $260 unassigned · 5 points short on savings.
Interpreting the result
The rule is a direction, not a test. In expensive cities needs routinely exceed 50%, and the honest response is to accept a lower savings rate temporarily rather than pretend the housing line is smaller. What matters is that the shares sum to 100% and the savings line is deliberate.
Assumptions & limitations
- Take-home pay is after tax and retirement deductions. Using gross makes every category look smaller than it is.
- Debt minimums sit in needs; extra repayment belongs in savings.
- Irregular income is averaged; a variable-income household should budget on the lowest month.
- Housing includes utilities and insurance where those are unavoidable.
Frequently asked questions
Is 50/30/20 a rule or a guideline?
A guideline from a 2005 personal-finance book. It is useful as a default split, not as a compliance test — high-cost housing markets routinely break the 50% needs ceiling.
What if my needs exceed 50%?
Accept it and protect the savings line by cutting wants first. If needs still exceed 60–65%, the problem is income or housing cost, not budgeting discipline.
Should retirement contributions count as savings?
Yes, including employer match. They are the most automated form of saving most households have, and excluding them understates the savings rate badly.
How do I budget on irregular income?
Budget on the lowest expected month and treat anything above it as savings. Budgeting on the average guarantees a shortfall in the bad months.
Methodology last reviewed 2026-10-18. Results are informational and not financial or engineering advice — see our disclaimer.