Irregular Income Budgeting for Tradespeople: Profit First

Updated October 21, 2026

The Problem With Budgeting Off Whatever’s in the Account

A steady paycheck makes budgeting almost automatic. The same number lands every two weeks, so a fixed budget mostly just works. Trade income doesn’t cooperate with that. A slow month and a month with three big jobs can differ by thousands of dollars, and most budgeting advice, including most of what’s written for regular employees, quietly assumes that doesn’t happen to you.

The result is what actually happens to a lot of business owners: decisions get made off whatever the bank balance says that day, not off any real plan. A big invoice clears and it feels like a good month to buy new equipment. A slow stretch hits and suddenly there’s no cushion for the tax bill that was always coming. Neither decision was exactly wrong. There just wasn’t a system telling you what that money was for.

Short version: Instead of one bank account and a gut feeling about what’s spendable, split incoming money into separate accounts by percentage as it arrives: profit, your own pay, taxes, and operating expenses. This is the Profit First system, and for contractors it only works if materials and subcontractor costs come out first. Applying the percentages to the full invoice instead of what you actually keep is the most common way it breaks for trade businesses.

The Core Idea: Decide Where the Money Goes Before You Spend Any of It

The method comes from Mike Michalowicz’s book Profit First, and there’s a version written for the trades too, Profit First for Contractors by Shawn Van Dyke. The usual way to run business money is Sales minus Expenses equals Profit: pay for everything, see what’s left, and hope it’s something. Profit First flips that to Sales minus Profit equals Expenses. A percentage gets set aside for profit and for your own pay first, and operating expenses have to fit inside whatever’s left.

The part that makes it work isn’t the math. It’s physical separation: several bank accounts, each with one job. Income lands in one account and gets moved by percentage into the others. Once it’s split, the operating expenses account becomes a hard limit. If it runs low, you don’t raid the tax or profit account to cover it. You cut an expense or delay a purchase. That’s uncomfortable on purpose, because it creates discipline instead of relying on willpower.

Setting Up the Accounts

A basic setup uses four accounts beyond your income account:

Profit: a real cushion and eventual owner reward, not touched for daily operations.
Owner’s Pay: what you actually pay yourself, moved to your personal account on a schedule.
Tax: the money for your quarterly estimated payments, covered below.
Operating Expenses: everything it costs to run the business day to day.

For a trade business, a fifth account matters: Materials and Subcontractors. If a real chunk of what customers pay you passes straight through to suppliers or sub-trades, that money needs its own lane, separate from the percentages applied to everything else. That’s the part that trips up almost every contractor who tries this system straight out of a generic guide.

Many banks let you open extra business savings or checking accounts at no cost, and some let you nickname them by purpose. The business banking and bookkeeping guide covers picking a bank and keeping the books clean once money is moving between accounts.

The Trap: Applying Percentages to the Wrong Number

Say a $10,000 remodel invoice includes $4,000 in materials and fixtures you bought and are passing through to the customer. That $10,000 landing in your account isn’t $10,000 that’s yours to divide up. The $4,000 was never really yours. It’s passing through you on its way to a supplier.

Apply the usual starting percentages (5% profit, 50% owner’s pay, 15% tax, 30% operating expenses) to the full $10,000, and you’ve handed out the whole invoice with nothing left to pay for the materials. The fix: move the $4,000 for materials into its own account first, before applying any percentages. What’s left, $6,000, is what Profit First calls “real revenue,” and that’s the number the percentages apply to: $300 profit, $3,000 owner’s pay, $900 tax, and $1,800 operating expenses. The materials account covers what you owe your supplier.

Two details make this more accurate. First, if you mark up materials, only your cost passes through. If those fixtures cost you $3,200 and you billed $4,000, the extra $800 is real revenue and goes through the percentages like labor does. The parts markup calculator shows how much of a parts bill is actually yours. Second, any sales tax you collect from customers belongs to the state, not you. Pull it off the top the same way, into the Tax account or its own account, so it’s there when the sales tax return is due.

Skip these adjustments and the numbers look fine for a while, right up until a materials-heavy month hits and there’s not enough in any account to cover what a supplier is owed.

Starting Percentages, and Why They Won’t Stay Fixed

The Profit First starting targets for a business with under $250,000 in real revenue are 5% profit, 50% owner’s pay, 15% tax, and 30% operating expenses. Treat those as a target to work toward, not a rule. Most people start somewhere else, often with operating expenses eating far more than 30%. That’s expected. Move a percentage point or two each quarter rather than trying to hit the targets right away. The account structure starts building better habits well before the percentages are tuned.

A simple rhythm helps too. Profit First suggests moving money into the accounts twice a month, on the 10th and the 25th, rather than every time a payment lands. Any two fixed days work. The point is a routine you’ll actually keep.

Is 15% Enough for Taxes?

The Tax account deserves extra attention, because it’s not a savings habit. It’s what pays your quarterly estimated taxes, and 15% of real revenue isn’t a magic number. Here’s a check I ran. Say your real revenue for the year is $100,000 and operating expenses take 30%, leaving $70,000 of profit (as a sole proprietor, your owner’s pay and profit accounts both count as taxable profit). Filing single with the standard deduction, federal self-employment tax plus income tax on that comes to about $14,342, or 14.3% of real revenue. So 15% roughly covers the federal bill at that level, but not your state income tax on top of it.

The share also climbs as you earn more. At $150,000 of real revenue with the same 30% expenses, federal tax alone runs about 15.9%. If you live in a state with an income tax, set the Tax account a few points higher than 15% to cover it, and check it against your actual state rate. The quarterly tax estimator takes your expected net profit and works out the real federal number, SE tax and the QBI deduction included, so you can set the percentage from your own math instead of a guess. 1099 self-employment tax realities explains where the numbers come from.

Adjusting for the Feast and Famine Cycle

A seasonal trade, more roofing in summer or more indoor work in winter, can’t run flat percentages year-round and expect them to hold up. The fix isn’t abandoning the system in the slow season. It’s loading it up during the busy one. Push the tax and profit percentages higher during peak months to cover the costs that don’t disappear when revenue does. Insurance, loan payments, and other fixed costs keep showing up in January whether or not any jobs closed that month.

A few more habits make slow months easier. Set your owner’s pay at a level the slow season can support, and let the profit account absorb the good months. Keep a separate cash cushion, the business version of an emergency fund, sized to two or three months of fixed costs. And for big known costs like an annual insurance premium or truck registration, a sinking fund spreads the bill across the year so it never lands on one bad month. Collecting deposits upfront on bigger jobs, covered in contracts and getting paid, smooths the gaps too.

This Isn’t the Same as Debt Payoff, Even Though It Rhymes

If debt is part of the picture, how to pay off debt when your paycheck is never the same covers the specific tactics: percentage-based extra payments instead of a fixed dollar amount, building a buffer before going aggressive, and splitting windfalls on purpose. It’s built on the same principle as this system, percentages that scale with income instead of fixed numbers that break in a slow month, just applied to personal debt instead of running the business. Read both if debt and irregular business income are both live issues right now.

On the personal side, once your owner’s pay lands in your household account, a regular budget takes over. Zero-based budgeting works well with a fixed owner’s pay, since every dollar of a known amount gets a job.

Bottom Line

None of this needs new software or a complicated setup. It takes separate accounts and a percentage split applied when money comes in, on real revenue, not the invoice total. Check the tax percentage against your actual numbers and your state. The system does the remembering for you, so by the time a bill or a tax payment comes due, the money’s already sitting where it needs to be.

Related Guides

Business banking and bookkeeping: setting up the accounts this system runs on.
Quarterly estimated taxes: what your Tax account is paying for.
Debt payoff on variable income: the same idea applied to debt.
Pricing your labor: making sure the revenue going in is enough.

This article is for general informational purposes only and isn’t financial, legal, insurance, or tax advice. For guidance specific to your situation, talk to a licensed professional.

Frequently Asked Questions

Nothing tells you what that money is for. A big invoice clearing can look like room to spend when part of it is already owed to a supplier or the IRS. Splitting revenue into dedicated accounts by percentage as it arrives removes the guesswork.

It’s a cash management system from Mike Michalowicz’s book Profit First. Instead of paying expenses and hoping profit is left over, you set aside percentages for profit, owner’s pay, and taxes first, in separate bank accounts, and run the business on what’s left for operating expenses.

Because that money was never really yours. It passes through you to a supplier or sub-trade. Applying the percentages to a full invoice that includes materials hands out money you don’t actually have, which is the most common way this system breaks for contractors. Only your cost passes through, though. Any markup you add is real revenue.

The Profit First targets for under $250,000 in real revenue are 5% profit, 50% owner’s pay, 15% tax, and 30% operating expenses, applied after materials and subcontractor costs are pulled out. Treat them as targets, not rules, and adjust a point or two each quarter based on your real numbers.

It roughly covers federal tax at moderate income, but often not state tax. In one example, $100,000 of real revenue with 30% expenses leaves $70,000 of profit, and federal SE plus income tax comes to about 14.3% of real revenue for a single filer. If your state has an income tax, or your income is higher, set the Tax account above 15%.

Don’t pull from the profit or tax account to cover it. Cut an expense, delay a purchase, or find another way to stay within what’s there. That hard limit is what creates real discipline instead of hoping you’ll remember not to overspend.

They’re built on the same principle: percentages that scale with income instead of fixed dollar amounts that break in a slow month. This system manages running the business day to day. The debt payoff approach applies the same logic to paying down debt.

Sources

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Budgeting for Irregular Business Income: A System That Actually Works