TikTok Shop break-even calculator: a UK cost framework

Updated November 2026. Policy sources checked 2 November 2026. All worked figures are illustrative assumptions, not current provider quotes or client results.

A TikTok Shop break-even calculator should identify the selling price or contribution needed to cover the costs you actually bear. The shortcut is fixed per-order costs divided by one minus the relevant variable-cost rates, but only when all percentage costs use the same revenue basis. VAT, different commission bases and refunds can make that shortcut unsuitable. The safer starting point is a line-by-line contribution calculation.

The useful checks:

• Separate customer payment, revenue and the platform's fee-calculation base.

• Use the SKU's actual rate and active incentives, not a universal 9% assumption.

• Include product, fulfilment, packaging, creator, advertising and unrecovered returns costs.

• Compare bundles against the same stock units sold separately.

What is the reliable contribution formula?

Contribution = revenue on the chosen tax basis - platform cost - creator cost - product cost - fulfilment - packaging - advertising allocation - expected unrecovered returns cost.

This is contribution before any further costs not included in the model, not automatically net profit. Decide whether fixed overheads and production costs belong in the decision, then include or explicitly exclude them. Revenue above a partial break-even price is not all profit.

Use actual currency amounts for costs when percentage bases differ. Reconcile one completed order to the settlement and provider invoices before using the model for a larger forecast. A clean spreadsheet can still calculate the wrong economic question.

When does the shortcut break-even formula work?

If revenue is R, fixed per-order costs are F, and every variable cost is charged on the same R, then contribution is R x (1 - combined variable-cost rate) - F. Setting that contribution to zero gives R = F / (1 - combined variable-cost rate).

Illustrative example: assume £10 fixed per-order costs and combined variable costs of 20% of the same revenue basis. Break-even revenue is £10 / 0.8 = £12.50. It is not necessarily a £12.50 VAT-inclusive customer price, and it excludes anything outside those assumptions.

If combined variable costs reach or exceed 100% of revenue, increasing sales at that structure cannot cover a positive fixed per-order cost. Change the price or cost structure before treating volume as the solution.

How should UK VAT be handled?

Use a consistent tax basis. HMRC's charging and recording guidance, checked 2 November 2026, explains that a standard-rated VAT-inclusive price is divided by 1.2 to calculate the price excluding VAT. Revenue from a £36 standard-rated price is therefore £30 excluding output VAT.

The HMRC VAT rates page, checked on the same date, distinguishes the 20% standard rate, 5% reduced rate and 0% rate for specified supplies. Exempt supplies are separate. Do not apply the standard-rate example to every product or every seller.

Remove input VAT from a cost only where the business is entitled to recover it. Ask the accountant to confirm the product's tax treatment, recoverability and any scheme being used. Do not mix VAT-inclusive costs and exclusive revenue without explaining the treatment.

Which platform rate belongs in the calculator?

Use the exact product category, active terms and settlement calculation. The UK Commission Rate Policy, checked 2 November 2026, states a standard 9% rate before reductions and describes specified category reductions that can produce a 5% effective rate.

The published commission base includes net sales, customer-paid shipping and platform discounts, with adjustments for the stated refunds. That base is not automatically the revenue figure used in your contribution calculation. Our UK fees guide explains the distinction.

Do not copy an old fulfilment tariff into the model as a current quote. Record the provider, packaged dimensions and weight, route, stock age, applicable services and VAT basis behind each cost.

What does a full illustrative order look like?

Assume a VAT-registered seller with a standard-rated £36 customer price, no buyer-paid shipping, no discounts and no refunds in the example. Revenue excluding output VAT is £30.

Assume costs borne after any recoverable input VAT of £3.24 platform commission, £5.40 creator cost, £8 product cost, £4 fulfilment and £3 advertising. Contribution is £30 - £3.24 - £5.40 - £8 - £4 - £3 = £6.36, or 21.2% of the £30 revenue.

These are hypothetical cost inputs, not a current FBT rate card, recommended creator rate or promised margin. The result is before overheads and further return losses. Replace each amount with the actual records before choosing a price.

Does a bundle increase contribution or just AOV?

Compare the same units sold separately with those units sold as a bundle. Keep the tax basis, included costs and measurement period consistent. A bundle may reduce shipping work while reducing revenue through its discount.

The worksheet below uses assumed GBP amounts on a consistent tax basis. Every cost is an amount borne by the business, not a claim about current tariffs. The separate-order column represents two orders together; the bundle column represents one two-unit order.

In this illustration, the bundle produces £0.15 more contribution for the same two stock units, despite £5 lower revenue. That is a narrow gain, not evidence that bundling always works. Different shipping tiers, packing work, return recovery or buying behaviour could reverse it.

Contribution per stock unit is contribution divided by units consumed. It helps when stock is scarce, but also compare total contribution and demand. An excellent unit calculation is not useful if the proposed bundle does not sell.

How do refunds and advertising affect break-even?

Use retained revenue and the unrecovered costs associated with returns rather than simply deducting a generic return percentage from profit. Keep refunded platform and creator amounts separate from fulfilment, return handling, damage and resale recovery.

Check that advertising allocation is not counted twice. A sale appearing in more than one attribution report is not multiple independent sales. State the period and allocation rule, then reconcile the total spend to actual billing.

Our returns guide explains the operating evidence to collect. Case-level responsibility and costs still need the relevant policy, order and provider records.

What should a target margin mean?

Name the denominator and costs included. Contribution divided by revenue is different from markup on cost. A 50% markup is not a 50% margin, and adding 50% to a break-even price does not establish a 50% contribution margin.

Choose the required contribution against the business's overheads, risk and growth plan. This guide does not prescribe a universal margin target or an industry average. The owner of the commercial decision should be able to explain which costs the target still has to fund.

Frequently asked questions

What is the TikTok Shop break-even formula?

Use fixed per-order costs divided by one minus combined variable-cost rates only when every rate uses the same revenue basis. Otherwise calculate contribution line by line with actual cost amounts, tax treatment and fee bases.

Is the UK commission always 9%?

No. The reviewed UK policy states a standard rate before eligible reductions. Verify the product category, active terms and actual settlement calculation rather than applying one percentage to every SKU.

Is everything above break-even profit?

No. It contributes towards costs omitted from the break-even model and then profit. State whether overheads, production, returns and tax effects are included before interpreting the result.

Should VAT be included in revenue?

Use the basis appropriate to the business and product. The standard-rated VAT-registered example separates output VAT from revenue and considers recoverable input VAT. Ask the accountant to confirm the treatment.

Do bundles always improve contribution?

No. Compare the same units, revenue basis and cost scope. Discounts, fulfilment tiers, packing work, product mix and returns can outweigh the saving from fewer parcels.

Is contribution per unit the only bundle metric?

No. Also consider contribution per order, total demand, inventory availability and operating capacity. A bundle can improve one metric while making the wider commercial result worse.

Speak to Z Media about a TikTok Shop growth model that accounts for the order you actually fulfil.