# Zero-Based Budget Calculator — Assign Every Unit > Zero-based budget calculator with 50/30/20, balanced and debt-payoff presets. Assign every unit of take-home pay until To Assign reads zero. Canonical: https://thebrinklabs.com/tools/zero-based-budget/ Source: The Brink Labs · support@thebrinklabs.com · Last reviewed 2026-09-07 --- Instrument 01 · Allocate ## Give Every Unit Of Income A Job. A budget is not a limit, it is an instruction. Enter what actually lands in your account and assign every unit of it somewhere before you spend any of it. The plan is finished when To Assign reads zero — and at that moment every envelope on the screen is a decision you have already made. Use net pay, not gross — a plan built on money that never arrives fails in week three. Changing this rescales every unlocked envelope and keeps your shape. The lock keeps an envelope's amount fixed — Auto Assign and income changes will route around it. Nature (Need / Want / Extra) is what turns a list of numbers into a judgement you can act on. Left to assign 03 — The Method ## Four Moves. That Is The Whole System. ### Start from money you have Not forecast income. A plan built on money that has not landed drifts out of balance the first week it does not. ### Fund obligations first Rent, loans, insurance, subscriptions. These are not decisions — treating them as spendable is the most common failure. ### Drive To Assign to zero A positive balance is money without a job, and it will find one. A negative balance is a plan that is already broken. ### Move money, don't abandon it Overspending one envelope is normal. Covering it from another, deliberately, is the method working. Where It Goes Next ## A Plan Is Easy Once. The Month Is The Hard Part. Allocating is the pleasant half. The difficult half is the Tuesday you buy lunch and have to know, right then, whether that money was already promised to something. MyneWallet carries the same envelopes into the actual month and answers that in two taps, on your phone, with no account. Android. One-time unlock for the full engine. No subscription, ever. Straight Answers ## Zero-Based Budgeting, Answered Plainly. ### What is zero-based budgeting? Zero-based budgeting means assigning every unit of income a specific job before it is spent, until the amount left to assign reaches zero. Rather than tracking what you spent after the fact, you decide in advance what each unit is for. Zero does not mean an empty bank account — it means no unassigned money. Savings, investing and debt payoff are jobs like any other. ### How is zero-based budgeting different from the 50/30/20 rule? The 50/30/20 rule is a fixed ratio — half of take-home pay to needs, thirty percent to wants, twenty percent to savings and debt. Zero-based budgeting is a method rather than a ratio: you assign every unit to a named envelope, and the resulting split is an output rather than a target. Most people start from 50/30/20 because deciding from a blank page is hard, then let the real numbers move the ratio. This calculator does both — the presets give you a starting shape, and you edit until it matches your life. ### What counts as a need, a want or an extra? A need is a cost you cannot remove this month without a real consequence: housing, utilities, groceries, transport to work, insurance, minimum debt payments. A want is discretionary consumption — dining out, entertainment, shopping, most subscriptions. An extra is money that increases your position rather than being consumed: emergency fund, investing, and debt payoff above the minimum. The split matters more than the category, because it answers a question a category never can — how much of this month was genuinely non-negotiable. ### What should I do if To Assign goes negative? Rebalance immediately rather than leaving it. A negative To Assign means the plan commits money you do not have, and every hour it stays negative is an hour you are budgeting fiction. Take the shortfall out of the largest want envelope first, then extras, and only then reduce a need. A plan that is honest and uncomfortable beats a plan that is comfortable and wrong. ### How do I budget on an irregular or freelance income? Budget the money that has already arrived, never the money you expect. Enter last month's actual take-home rather than an average, assign all of it, and repeat when the next payment lands. Over a few cycles the pattern in this tool becomes your floor, and anything above it goes to the extras envelopes. Forecast-based budgeting fails hardest exactly where income is least predictable. ### Is this budget calculator private? Yes, by architecture rather than by promise. Every calculation runs inside your own browser. The page sets no cookies, writes nothing to local storage, loads no analytics or advertising script, and makes no network request carrying your figures. Closing the tab destroys the data because there is nowhere else for it to be. Open your browser's developer tools and check the network and storage panels — that is the only kind of privacy claim worth making. ### How much should I save each month? There is no universal number, and anyone quoting one is guessing about your life. What this tool gives you instead is your actual savings rate — the share of take-home pay going to extras — displayed in the centre of the ring as you move money. Watching that figure respond to a single cancelled want is more useful than a target, because it is yours, and because it moves when you do. Educational and illustrative. Figures depend entirely on inputs you choose, and nothing here is financial advice. The Brink Labs is a software lab, not a financial adviser. Next Instrument ## Subscription Bleed Audit What renting software really costs, per use and per decade. All 6 instruments --- This is the markdown representation of https://thebrinklabs.com/tools/zero-based-budget/, published so that AI agents and answer engines can read the page without parsing HTML. The full index of machine-readable resources is at https://thebrinklabs.com/llms.txt