One Person Business Budget:Set It Up in an Afternoon

A one person business budget takes one afternoon. Block it and work in this order: the envelope, then no more than six categories, then fixed, variable and discretionary, then a named buffer, then a review day. Connect it to actual spend later. Stop there.

One person business budget: how to set it up in one afternoon

Here's the rule that governs everything below. If it takes longer than an afternoon, it's too complicated to survive.

That's not a productivity tip. It's a survival test. A budget you can't keep up gets abandoned, and an abandoned budget is worse than none, because you'll still half believe the numbers. So the setup of a one person business budget is designed to be small, ugly and finished.

You need your account balances, a list of what you pay for, and the plan for the next quarter or two. No software required to start. Here's the order, and the order matters.

Now the detail, with the traps.

Start with the envelope, not the wish list

Open your balances first. Not your ideas.

Decide how much you're willing to spend across the period. That total is fixed before any line exists. Then you allocate inside it. Every line is now a visible choice against every other line, which is the entire point of doing this.

The common mistake runs the other way. You list everything you'd like, add it up, and stare at a total that's bigger than your bank account. Then you spend the evening cutting everything by some arbitrary amount. Nobody enjoys that, and nothing good comes from it.

Keep the period short too. A quarter or two. A speculative year isn't a plan.

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Cost the plan you actually have

Here's where almost everyone shortcuts. They open last quarter's spending and tweak it.

Don't. Last quarter's numbers contain every accident of last quarter, and copying them makes those accidents permanent. It also makes it almost impossible to fund anything new, because everything already has an owner and a precedent.

Start from what you intend to achieve this period. If you want more reach, more revenue, no team, write down what gets you there and put a price beside each item. It's slower. It's also the only version that can give you a different allocation from the one you already have, and presumably that's why you're here.

Six categories. Maybe fewer.

Your accountant needs a chart of accounts. You need categories you can make decisions about. Those aren't the same list.

Try something like tools and subscriptions, infrastructure and hosting, contractors and help, marketing, professional services, and one-offs. Six or fewer, and each one must be a lever you could genuinely pull on the night you need months back.

Twenty categories is bookkeeping. You won't maintain it. It won't help you decide anything.

Then give every line an owner. At one person this sounds absurd, and it still matters. An unowned line is one nobody watches. And when you eventually bring in help, the lines you hand over should arrive with someone attached. For now, "owner" means the person who explains the variance. That's you, to yourself, once a month.

Find your floor

Sort every line into one of three piles. Fixed, variable, discretionary. Fixed costs keep coming whatever happens. Variable costs scale with activity. Discretionary spend is optional.

The exercise gives you your true monthly floor, which is the number that matters in a difficult month. It also shows you where the flexibility is. Be suspicious of your own sorting: most people overestimate how much of their spend is really fixed. The full test for each line is in fixed vs variable vs discretionary costs.

Name the buffer. Keep the loose money small.

Something will happen that you haven't budgeted for. Reliably. So put a contingency on the page, visible, labelled, not allocated to anything. Don't hide cushions inside every line. Same money, less visible, and now no number means what it says.

Then look at what's left unassigned. Keep that small and deliberate. Money with no job gets spent by whatever occurs to you first, and that's the behaviour you set out to end. A big unassigned pool is an absence of a decision dressed up as flexibility. Sizing the buffer is covered in how to set a business buffer.

One more mark to make while you're here. Tag each line as an allocation you may spend, or a forecast of a cost you don't control. An allocation decides what is permitted. A forecast predicts what will happen. You want to know which is which when a number moves.

Set the day and the trigger

Put the review in the calendar now, for the whole period. Same day each month. Ten minutes.

Then write one sentence: what event makes you rebuild instead of adjust? A significant change in revenue. A major change of direction. A new source of money. Pick yours. Decided now, it keeps you out of both ditches: endless re-forecasting, or loyalty to a budget that stopped describing reality two months ago.

Finally, accept the framing. This is a hypothesis with a review date. Missing it is not a failure. It's information.

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Connect it to actual spend, or it dies

This is the half-day job that follows the afternoon. It decides whether the budget is alive in three months.

If you have to reconcile against a bank statement by hand, you'll do it twice and quit. Worse, you'll half remember the numbers and treat them as current. When actual spend flows in against your categories automatically, the budget stops being a document and becomes an instrument. The monthly review turns into a ten minute reading instead of an evening of data entry.

If you do one operational thing from all of this, do that. After that, check three more things:

• Anything that fits no category is visible, not lost.
• The whole budget fits on one screen.
• Your revenue assumptions match the ones you use everywhere else.

Then stop

No scenario trees. No rolling model. Not until the simple version has survived two reviews and changed a decision.

Elaborate is not the same as good. It's often just procrastination with a better font. Once it's running, the useful next read is how to review a budget every month.

What finished looks like

Before you close the laptop, run a quick test. Tick each box or fix it.

• I started from what is available, not from a wish list.
• There are six categories or fewer, and every line has an owner.
• I know my monthly floor if everything discretionary stopped.
• There is a named contingency, and the individual lines aren't padded.
• The review day is in the calendar and the rebuild trigger is written down.

If you can tick all of those, you have a budget. Not a perfect one. A usable one, which is better. You can fix a rough budget in the next review. You can't fix a budget you never finished.

Free guide · 19 pagesBudget for a plan that keeps changing.The Budget Playbook: planning spend you will actually follow.Get the free guide →

Where a one person business budget usually goes wrong

Three patterns, all avoidable.

First, building bottom-up and reconciling at the end. You've met this one above. The total always exceeds what exists.

Second, copying an accounting chart into the budget. It looks professional. It is useless as a decision tool, because your accountant's structure is not a set of levers.

Third, making it a commitment. You'll pad, defend lines you've outgrown, and spend to the limit. Since the only person holding you to it is you, all of that effort is wasted. The wider list is in budget mistakes to avoid.

Notice the pattern. None of these is a maths problem. They're failures of framing and routine. Both are settled in one afternoon and a recurring ten minutes.

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Frequently asked questions

How long does it take to set up a budget?

A one person business budget takes one afternoon to build, then about half a day to connect it to your real spend. If building takes longer than an afternoon, the budget is too complicated to survive and you should simplify it.

How many categories should I use?

Six or fewer. Each should be a lever you could genuinely pull, such as tools, hosting, help, marketing, professional services and one-offs. Twenty categories becomes bookkeeping that you won't maintain.

Should I base it on what I spent last quarter?

No. That locks in every historical accident and makes funding anything new nearly impossible. Start from what you want to achieve this period, cost that path, and allocate inside what you actually have.

Do I need software?

To start a one person business budget, no. To keep it alive, yes in effect: the budget needs actual spend flowing in automatically, because anything reconciled by hand is reconciled twice and then abandoned.

The full method, with the checklists, is in The Budget Playbook, a free 19-page playbook.