Most first-time founders I talk to believe that if they never take cash out of the business, and they keep putting the profit straight back into inventory, there will be no tax bill.

There will be, and it covers all of the profit, whether the cash ended up in your pocket or on a shelf, as inventory.

What I find is that most founders don't have a solid understanding of the difference between an income statement, a balance sheet, and a cash flow statement. That's an article for a whole other time, but the most important thing to understand is that a balance sheet is a place where profit can sit, and it can still be taxable.

But before we get too far into it, here's the small print up front. I am one guy who has done this a number of times, this is a friend talking to a friend, and it is not tax advice, I'm not a CPA.

The year that catches people

When working through things like this, I like to oversimplify, so let's keep it to a single year. You sell $500,000 of inventory and you make $100,000 of profit. You do not pay yourself a penny of it. You spend all of it buying more inventory, because you are growing and that is what growing looks like.

At the end of the year that $100,000 has turned into inventory, and there is nothing in the bank.

You still made $100,000, and you owe tax on it.

Inventory is a balance sheet item. Buying it is not an expense that reduces your profit, and its cost only reaches the income statement as cost of goods sold in the year you sell it. So putting the money back in is still taking your profit. The tax follows the profit, and the profit is not where the cash is.

Let's say your business is in the United States and you're running it as an LLC that's a pass-through entity. Your federal tax bill on that $100,000 will be somewhere around $22,000. Most of that is self-employment tax at 15.3% rather than income tax. Your state then takes its share.

Whatever the amount it comes to, and whatever country you live in (assuming it has corporation tax or income tax), the tax bill will need to be paid in cash. You've taken all of that cash and invested it into inventory, so you might not necessarily have the cash available to make the payment.

Where the profit hides

There are three documents that describe a business, and they each answer slightly different questions. The income statement says whether you made money. The balance sheet says what you own and what you owe. The cash flow statement says what actually moved.

Profit can be entirely real while the cash is gone, because the profit went onto the balance sheet. It became inventory on a shelf, or money a customer has not paid you yet, or a machine in the corner. None of those are expenses. They are things you own, bought with profit you already earned.

The tax follows the income statement. Your bank balance follows the cash flow statement. In a growing business those two drift apart, and they drift furthest in the year you grow fastest, which is why the bill and the empty account tend to arrive in the same year.

Two ways to be taxed, wherever you are

It matters much less than people think whether you register in the United States, the United Kingdom, or Taiwan. Broadly there are two ways the tax can work. Every country I have dealt with has a version of both.

The first taxes the profit in your hands. The company is looked through, and the profit counts as your income whether you took it out or not. That is a sole trader in the UK, a single-member LLC in the US by default, and a sole proprietorship in Taiwan.

The second taxes the profit in the company's hands. The company pays its own tax, the money can stay inside, and you pay again personally when you take it out. A limited company in the UK, a corporation in the US, and a limited company in Taiwan. Two layers instead of one, and in exchange the profit can sit and compound inside the business.

Which business structure is best for you comes down to one question. Are you drawing money out year by year, or building something to sell?

Drawing money out points at the first, because one layer of tax beats two. Building to sell points at the second, because profit kept inside the company is taxed at the company's rate rather than yours, and when you eventually sell you are taxed on a gain rather than on income. Several countries also have reliefs on the sale of small company shares that only exist for companies and can exempt a very large slice of that gain.

What to actually do

Whichever way you go, work the number out early.

I personally do not park the cash in a separate account for twelve months (although I know some people who do and many accountants who recommend it). That to me is working capital, and in a growing business it is the lifeblood. Use it. Buy the inventory, fund the growth, take the opportunities when they come. What matters is that you know approximately the size of the tax bill that's coming and you have a way to pay it, whether that is inventory you can turn, money customers owe you, or a facility you arranged before you needed it.

The founders I have watched get hurt by this were not careless. They were growing fast, they were reinvesting everything, and they were reading a bank balance as though it were a profit and loss statement. Those are two different documents and the tax authority reads the other one.

If you are working through this and want to talk it over, message me on LinkedIn and I will give you thirty minutes.

Sources. Internal Revenue Service inflation adjustments for tax year 2026. Self-employment tax is 15.3%, being 12.4% for Social Security up to the 2026 wage base of $184,500 and 2.9% for Medicare, charged on 92.35% of net earnings. The illustrative $22,000 combines self-employment tax with federal income tax for a single filer taking the standard deduction and the qualified business income deduction, and excludes state tax. Reliefs on the sale of small company shares include Section 1202 in the United States and Business Asset Disposal Relief in the United Kingdom.