The Best Budget Calculator for Variable Self-Employed Income
The 50/30/20 rule was designed for W-2 workers with predictable paychecks. Freelancers and contractors have lumpy revenue, quarterly tax bills, and no employer safety net. This calculator adapts the framework to irregular income — and shows what a lean month actually looks like.
🧮Try 50/30/20 Budget Calculator →50/30/20 Budget Calculator
Build a 50/30/20 budget from your income and see exactly where every dollar should go
- ✗Fixed income is assumed — every standard budget calculator starts with 'monthly take-home pay.' Freelancers don't have a fixed take-home. Income varies month to month.
- ✗Quarterly taxes aren't a budget line — most budget tools include income tax withheld from a paycheck, but self-employed workers need to reserve 25-30% of every payment for quarterly taxes. This is almost never modeled.
- ✗Savings rate isn't shown — the 50/30/20 split is useful, but knowing your actual savings rate as a percentage of gross income is what drives long-term wealth building.
- ✗Lean month planning is missing — what's the minimum monthly spend needed to cover essential fixed costs when revenue is slow? Most budgeting tools don't help you find your financial floor.
Input your average monthly revenue and the tool calculates your budget based on net income after estimated taxes — not a fictional fixed paycheck.
A dedicated tax reserve line keeps self-employment tax and estimated income tax out of your spendable income bucket. Set a percentage and the tool holds it aside automatically.
The calculator identifies your fixed essential floor — the minimum monthly spend to cover housing, utilities, food, and debt payments. Know your runway when revenue dips.
Your savings rate is shown as a percentage of gross income, not just net — so you can benchmark against FI targets and FIRE timelines without a second calculation.
| Feature | Typical Calculator | Reise Tools |
|---|---|---|
| Variable / irregular income input | ||
| Quarterly tax reserve line item | ||
| Lean month fixed expense floor | ||
| Savings rate as % of gross income | ||
| 50/30/20 split with adjustable percentages | Partial | |
| Formula shown for every output | ||
| FI / FIRE timeline integration | ||
| Free with no account required |
Every Reise calculator has a ShowMath panel — expand it and you see the exact formula with your actual numbers substituted in. Not a result. Not a black box. The full derivation, step by step.
A budget that ignores tax reserves and variable income isn't a budget — it's an optimistic spreadsheet that breaks every slow month. The ShowMath panel shows exactly how gross revenue becomes take-home pay becomes spendable income, with every tax and savings assumption visible.
Calculate your savings rate and see how it affects your path to financial independence. FI number, years to FI, projected retirement balance, and a sensitivity table across 5–70% savings rates.
Calculate your quarterly IRS payments with QBI deduction (Section 199A), safe harbor, and all 4 due dates. Adds the 20% pass-through deduction that most freelancers forget to claim.
100+ free calculators. Every result shows the formula. No account required.
Open 50/30/20 Budget Calculator