Is Your Side Business Profitable? Margin, Markup, and Break-Even

Revenue is vanity, profit is sanity

I have lost count of the number of small business owners — and I mean this kindly — who have walked into a tax prep meeting beaming about their revenue, only to go quiet when we worked through the actual profit. A candle maker doing $40,000 in sales sounds impressive until you subtract $18,000 in materials, $6,000 in shipping, $3,500 in marketplace fees, and $4,000 in packaging. Suddenly that $40,000 is $8,500 before you even think about taxes, and the hourly rate for all the time invested starts looking uncomfortably close to minimum wage.

If you run a side business — selling products online, freelancing, tutoring, making crafts, offering services — you owe it to yourself to know whether it is actually making money. Not revenue, not “it seems like it is working” — actual profit, calculated honestly, with all costs included. The good news is that the maths is straightforward. The hard part is being honest about every expense.

This guide is written from a US small-business lens. That matters because sales-tax rules, income-tax treatment, filing thresholds, and recordkeeping expectations vary by jurisdiction. Use the numbers here as planning tools, then sanity-check the tax side against your state rules and, if the business is growing, a qualified accountant or tax adviser.

What is the difference between profit margin and markup?

This trips up almost every new business owner I work with. Margin and markup are related but different, and confusing them can lead to pricing that looks profitable on paper but is not.

Markup is how much you add to your cost to arrive at the selling price. If an item costs you $20 to make and you sell it for $30, your markup is 50% (you added $10 on top of a $20 cost).

Profit margin is what percentage of the selling price is profit. That same $30 item with $20 in costs has a profit margin of 33.3% ($10 profit out of $30 revenue).

Notice the difference: 50% markup, 33.3% margin. Same item, same profit in dollars, but very different percentages. If you set your prices based on a “50% margin” when you actually mean 50% markup, you are underpricing everything and leaving money on the table.

Let’s use the Profit Margin Calculator to see your real margins.

Healthy margins vary enormously by industry. Software and digital products can run 70 to 90% margins. Handmade physical products typically sit between 30 and 60%. Food and beverage businesses often operate on razor-thin margins of 5 to 15%. Knowing where your margin sits relative to your industry helps you understand whether your pricing is competitive or whether you are undercharging.

The important part is not chasing some magical benchmark from a stranger on the internet. It is knowing whether your current margin leaves room for mistakes, discounts, returns, and the sort of boring admin costs that never show up in your glamorous launch post. If the calculator says your margin is 12% and one platform fee change wipes out 4% of that, you do not really have a pricing strategy. You have a nervous system disorder.

How do you set the right markup for your prices?

Once you understand your costs, the Markup Calculator helps you work the other direction — figuring out what selling price you need to hit a target margin.

Here is a practical example. Say your total cost to produce and deliver a product is $35 (including materials, packaging, shipping, and marketplace fees). You want a 40% profit margin. The calculator will tell you the price you need to charge. If that price feels too high for your market, either your costs need to come down or you need to accept a lower margin — but at least you are making that decision deliberately rather than guessing.

A common mistake I see with side businesses is forgetting to include all costs. Your time has a value. The internet you use, the software subscriptions, the business insurance, the petrol to the post office — these are real costs. If you exclude them from your cost calculation, your margin looks better on paper but worse in your bank account.

This is also where service businesses fool themselves. A designer may think the “cost” of a logo job is basically zero because there is no physical product involved. But time, revisions, software, self-employment tax, merchant fees, and unpaid admin all belong in the picture. If the markup calculator gives you a price that feels uncomfortable, that may be a market problem, but it may also be the first honest number you have seen.

How do you calculate your break-even point?

Your break-even point is the number of units you need to sell — or the revenue you need to generate — to cover all your costs. Below that point, you are losing money. Above it, you are making profit.

Every business has two types of costs. Fixed costs stay the same regardless of how much you sell: website hosting, software subscriptions, insurance, equipment depreciation, booth fees at a market. Variable costs change with each unit sold: materials, shipping, packaging, marketplace commission fees.

Your break-even point is fixed costs divided by (selling price minus variable cost per unit). If your monthly fixed costs are $500, your selling price is $40, and your variable cost per unit is $22, you need to sell 28 units per month just to break even. Everything after that is profit.

Use the Break-Even Calculator to find your number.

Knowing your break-even point changes how you think about your business. Instead of “I hope I sell enough this month,” it becomes “I need to sell 28 units to cover costs and everything beyond that is profit.” It is a target, and targets are more useful than hopes.

If your break-even point feels unreachably high, that is a signal to look at either reducing fixed costs, increasing prices, or finding ways to lower variable costs per unit. Sometimes it also means the business model does not work at its current scale, which is painful to hear but better to know now than after another year of below-break-even operations.

And this is the part many side-business owners skip: break-even is not the same thing as “worth it”. Breaking even may still leave you paying yourself almost nothing for evenings and weekends. I used to see this with tax-prep clients who were technically in the black but functionally earning less than they would have made picking up an extra shift somewhere else. Once you know your break-even number, ask the more uncomfortable follow-up question: how many sales do I need before this is paying me properly?

How should sales tax and income tax affect your pricing?

One more cost that side business owners chronically under-account for: taxes. If you are selling physical products, you may need to collect and remit sales tax depending on your jurisdiction. And the profit your business generates is income that needs to be reported and taxed.

Use the Sales Tax Calculator to make sure you are pricing correctly after tax.

If you are collecting sales tax, it should be added on top of your selling price, not absorbed into it. A $40 product with 8% sales tax should be listed at $43.20, not priced at $40 with $3.20 eating into your margin. This seems obvious, but I have seen it go wrong more times than I would like to admit.

For income tax, a reasonable rule of thumb is to set aside 25 to 30% of your net profit for tax obligations. This is conservative, but being over-prepared for a tax bill is infinitely better than being surprised by one. If you are running a side business alongside employment, your side income sits on top of your salary for tax purposes, which often means it is taxed at a higher marginal rate than you expect.

Two important US caveats belong here. First, if you are self-employed, federal tax is not the whole story: self-employment tax can apply as well, and quarterly estimated payments may be required depending on what you owe. Second, sales-tax rules are not one universal national setting. State and local rates differ, product taxability differs, and nexus rules can change when you sell across states or platforms. The calculator is useful for line-item pricing, but it is not a substitute for checking the jurisdictional rules that apply to your actual business.

What numbers should you track every month?

The businesses that survive and grow are the ones where the owner knows their numbers intimately. Not approximately, not “I think we are doing okay” — actually knows them. Margin, markup, break-even, tax liability. When you know these numbers, every decision becomes clearer: whether to offer a discount, whether to switch suppliers, whether to invest in advertising, whether the business is worth your time at all.

Run the calculators above with your real numbers. If the results are encouraging, you have a solid foundation to build on. If they are sobering, you now have the information you need to make changes — adjust pricing, cut costs, or pivot your approach — rather than discovering the problem at tax time.

Before you change prices, use the outputs together rather than one at a time. Margin tells you whether each sale is healthy. Markup tells you what price you need. Break-even tells you whether the monthly volume is realistic. Sales tax tells you whether the customer-facing price still works once compliance is layered on top. When those four numbers agree with each other, you have the beginnings of an actual business model instead of a hopeful spreadsheet.

This article is informational, not personalised tax or financial advice. If your side business has meaningful revenue, employees, multi-state sales, inventory complexity, or a pricing change that affects your household finances, speak to a qualified accountant, tax professional, or adviser who can look at your actual situation.