Sole Trader or Limited Company for Online Sellers? The 2026/27 Numbers That Decide It

Most content on this topic gives a generic answer based on income tax versus corporation tax rates. That comparison is correct as far as it goes, but it misses the two factors that actually move the decision for sellers: how much cash you need to extract each year, and how much you reinvest into stock. Those two variables can shift the optimal structure entirely, even at the same headline profit.

This page works through the 2026/27 numbers, the seller-specific reinvestment factor, and a worked example. Then the sole-trader-vs-ltd-sellers calculator handles your actual figures, because a single example cannot represent your position.

The short answer: the decision rule

Stay sole trader if your profit is below roughly £30,000 to £40,000, or if you need to extract nearly all your profit to live on. Incorporate if your profit is above that range, you can leave a meaningful portion inside the company, and you are prepared for the additional compliance overhead of running a limited company. The reinvestment factor (below) adjusts this in one direction or the other depending on how stock-heavy your business is.

Neither structure is obviously correct for every seller. The right answer depends on your numbers.

What actually differs between the two structures

The 2026/27 tax maths

Two sets of rates drive the comparison.

As a sole trader

Your trading profit sits on top of any other income and is taxed at income tax rates: 20% basic rate, 40% higher rate, 45% additional rate (thresholds frozen through 2027/28). On top of income tax, Class 4 NIC runs at 6% on profit between £12,570 and £50,270, and 2% above £50,270. A sole trader making £60,000 of self-employment profit faces 40% income tax on the higher-rate slice plus 2% Class 4 NIC above the upper threshold, a combined marginal rate of 42% on that portion.

As a limited company (salary plus dividends)

The company pays corporation tax at 19% on profits up to £50,000 (small profits rate) or 25% on profits above £250,000, with marginal relief between. Most seller companies at launch sit in the 19% band. The director-shareholder then draws a low salary (up to the NIC secondary threshold of £5,000 per year to avoid employer NIC) and takes remaining extraction as dividends.

Dividend tax from 6 April 2026 applies at 10.75% (basic rate), 35.75% (higher rate), 39.35% (additional rate) on dividends above the £500 annual allowance, under Finance Act 2026 s.4. These rates are higher than the 8.75%/33.75% figures that still appear in many guides written before the 2026 Act. If you are modelling the comparison using the old rates, your calculation is wrong.

On a basic-rate dividend (salary plus dividends keeping you within the basic-rate band): corporation tax plus dividend tax at 10.75% on the extracted amount. At the 2026/27 dividend rates the combined take on a fully extracted pound is close to, and in some profiles above, the sole-trader equivalent. The old assumption that extraction through a company always beats sole-trader tax no longer holds; the worked example below shows why.

The seller wrinkle: cash reinvested into stock

Here is the factor most generic sole-trader-vs-Ltd content ignores. A sole trader pays income tax on profit whether or not that profit is sitting in a warehouse as stock. If your business cycle requires you to buy £20,000 of Christmas stock in October, you still owe the tax on that £20,000 of profit by January, even though the cash has already left your bank account.

A limited company's retained profit is taxed at corporation tax rates (19% in most cases), not income tax rates. If you leave cash inside the company to fund the next stock buy, you defer the higher dividend tax until you actually need the money personally. For a rapidly growing seller reinvesting most profit into inventory, this deferral can be a meaningful cash-flow benefit: the company keeps more working capital after tax to fund the next order.

The flip side: if you need to extract most of your profit to cover personal costs, the deferral benefit disappears and you are left comparing corporation tax plus dividend tax against income tax. At 2026/27 dividend rates, the gap is smaller than it used to be, and for sellers who extract everything, it can be close to neutral before compliance costs are accounted for.

The reinvestment factor therefore pushes the balance toward a limited company for sellers who can leave money in the business, and away from it for sellers who need to draw most of their profit personally.

Worked example at a typical seller profit level

The figures below are illustrative at a profit of £70,000, with the director-shareholder having no other income and extracting the full amount each year. Numbers are rounded for clarity. Run the calculator for your exact position.

At £70,000 of profit with full extraction, the limited company is now slightly worse off under the 2026/27 rates, before the extra accountancy, payroll and Companies House costs are even counted. This is the single biggest change the FA 2026 dividend rates made to this decision, and most pre-2026 guides still show the opposite result.

The picture reverses when profit is retained. If the same seller reinvests £30,000 of the £70,000 into stock and only extracts £40,000, the dividend tax on the extracted amount falls substantially, and the retained £30,000 suffers only corporation tax rather than the 40% income tax a sole trader would pay on it in the year. Retention is where the company route earns its keep for growth-mode sellers.

These are illustrative figures only. Your salary level, pension contributions, other income, stock cycle timing, and compliance costs all shift the outcome. Use the calculator with your numbers.

Run your own numbers

The calculator below takes your profit level, extraction need, and stock reinvestment to produce a side-by-side tax comparison at 2026/27 rates. It accounts for the corporation tax bands, the £500 dividend allowance, and the FA 2026 dividend rates.

Open the sole trader vs limited company calculator for online sellers

If you want to model your true take-home after marketplace fees and cost of goods, the seller take-home calculator works alongside this one.

Non-tax factors for sellers

The tax maths is the main driver, but three non-tax factors matter for ecommerce businesses specifically.

Limited liability on stock and supplier debt

A sole trader carries unlimited personal liability for business debts. For a seller running on supplier credit, buying forward stock, or using inventory financing, a bad trading year can expose personal assets. A limited company ring-fences company debts from your personal finances, though lenders frequently require a personal guarantee from directors of small companies, which reduces (but does not eliminate) that protection.

Marketplace and platform account rules

Amazon, eBay and similar platforms treat a limited company as a separate legal entity from the director personally. This can be relevant for account reinstatement, brand registry, and in some cases for aggregator or brokers-led exit discussions where a share sale (of the company) is more attractive than an asset sale. Check the platform's seller agreement for your specific situation.

Credibility with suppliers and trade accounts

Some wholesale suppliers and trade-account providers are more willing to extend credit terms to a limited company than to a sole trader, because the company exists as a searchable, registered entity with publicly filed accounts. This is a practical benefit that grows as your business scales.

Generic incorporation mechanics: how to actually set up a limited company

This page covers the decision. The mechanics of incorporating (Companies House registration, share structure, articles of association, and the process of moving from sole trader to limited company) are covered in depth elsewhere. See the sole trader vs limited company guide for the step-by-step process.

Common failure modes

Incorporating too early

The most common mistake is incorporating at a profit level where the tax saving does not cover the compliance overhead. At £25,000 of profit, the annual accountancy and filing costs of running a limited company can easily exceed the tax benefit. Incorporation makes sense when the numbers stack up, not as a reflexive "professional" move.

Modelling at the old dividend rates

A large amount of sole-trader-versus-limited-company analysis still circulates using the pre-FA2026 dividend rates of 8.75% and 33.75%. Those rates no longer apply from 6 April 2026. The correct 2026/27 rates are 10.75% (basic) and 35.75% (higher) under Finance Act 2026 s.4. If your adviser's model or any online calculator still uses the old rates, the saving it shows is overstated.

Ignoring the stock reinvestment factor

A comparison that treats all profit as extracted understates the limited company advantage for growth-mode sellers. Conversely, a comparison that assumes all profit is retained overstates it for sellers who need the cash personally. Model the extraction you actually plan to make, not the theoretical optimum.

For the right numbers for your business, use the sole trader vs limited company calculator, or talk to us about your ecommerce structure through our ecommerce tax services. You may also find it useful to explore our hub pages for Amazon sellers and Shopify sellers for structure-related considerations specific to each platform.