The Quiet Line Item That Rewrites Your Launch Plan: VAT and the £90,000 Question

Every founder has a launch calendar. There is the private beta date, the public beta date, the press list, the Product Hunt post, the first paid ad, the first invoice. Somewhere between those milestones sits a deadline that does not send a calendar invite: the VAT threshold.

In the UK, VAT registration is triggered when VAT-taxable turnover goes over £90,000 in any rolling 12-month period—or when you expect it to go over that figure in the next 30 days alone. At the time of writing in 2026, that is the number to watch. It is not a year-end test, and it is not a Companies House filing. It is a rolling arithmetic problem that can quietly reshape your pricing, your margins and the story you tell investors.

This is not tax advice. It is a launch-planning problem. And it usually lands on the product team, not just the accountant.

The deadline that hides in monthly reporting

Founders are good at watching MRR. They are less good at watching rolling VAT-taxable turnover, especially when revenue arrives in lumpy chunks: annual prepayments, consultancy invoices, marketplace commissions, shipping income. A strong quarter can push you over the line without anyone noticing until the bookkeeper asks for a VAT number.

That is when the scramble starts. The pricing page says “£12 a month” with no VAT wording. The checkout assumes the price is the price. The investor deck talks about gross revenue. The finance model has a line for corporation tax but nothing for output VAT. None of these are fatal, but they are all easier to fix before the threshold is crossed than after.

What changes on day one

Once registered, you charge VAT on taxable sales, reclaim VAT on eligible business purchases, file returns and keep records. For consumer-facing businesses, displayed prices normally need to include VAT. For B2B customers, you can show prices excluding VAT as long as it is clear and the invoice meets the rules.

The margin question is the one that catches people. If you sell something for £12 including VAT after registration, the VAT portion is £2 and your net revenue is £10. If you were previously keeping the full £12, that is a 16.7% drop in net revenue—not a 20% drop, because the VAT is calculated on the gross price. To keep £12 net, you would need to charge £14.40 including VAT. That is a 20% increase for the customer.

That is why VAT is not just a finance admin task. It forces a pricing decision.

Three founder scenarios

Priya, consumer subscription app. Priya runs a habit-tracking app at £9 a month. She has 9,500 subscribers and is cruising towards the threshold. If she absorbs VAT, her net revenue per subscriber falls to £7.50. If she raises the price to £10.80, existing customers see a 20% increase. If she restructures around annual prepay and a higher-tier plan, she can change the mix without making the entry price feel hostile. All three are legitimate. Doing nothing is the one that hurts.

Marcus, B2B SaaS with annual contracts. Marcus sells £15,000 annual contracts to SMEs. Most of his customers are VAT-registered, so adding VAT is often a cashflow issue rather than a price issue. But his contract template says “£15,000 per year” without “plus VAT”. That ambiguity becomes a negotiation. The fix is boring and important: update the template, the quote builder and the checkout copy before the first post-registration invoice goes out.

Sam, marketplace with mixed income. Sam takes commissions, charges listing fees and sells some physical goods. Not every line of revenue is treated the same way. The launch team needs a clear map of what is taxable, what is exempt and what is outside the scope. Without that map, the pricing page becomes a guessing game.

Absorb, raise or restructure

Absorbing VAT is a margin decision. It can be right if you are chasing growth, if competitors are not VAT-registered, or if a price rise would break a key acquisition channel. But you need to show the margin hit in your model, not discover it in month two.

Raising prices is a positioning decision. A 20% increase is noticeable. If you go down this route, give customers notice, explain the change plainly and make sure the new price is visible everywhere: ads, comparison pages, app store listings, sales decks and checkout.

Restructuring is a product decision. You might move to annual billing, bundle services, change your target customer, or separate a low-margin consumer product from a higher-margin B2B one. This is often the most interesting option because it forces you to ask what the product is actually for.

The pre-threshold checklist

• Monitor rolling 12-month VAT-taxable turnover monthly, not just at year-end.
• Model 20% VAT against every price point, including discounts and annual plans.
• Decide whether you are absorbing, passing on or restructuring—and write down why.
• Check consumer price displays and B2B quote templates for VAT wording.
• Update terms, invoices, subscription intervals and your billing software.
• Forecast cashflow: VAT collected is not your money.
• Ask your accountant whether voluntary registration would help you reclaim input VAT earlier.
• Tell existing customers before the change, not after the first invoice.
• Brief investors on net revenue, gross margin and how you define ARR.
• Give one person ownership of threshold monitoring.

The investor conversation

Investors are used to VAT, but they will still ask why net revenue stepped down or why gross margin moved. The good answer is that you saw the threshold coming, modelled the impact and made a deliberate pricing choice. The bad answer is that the finance function found out after the launch campaign went live.

VAT is a pass-through tax, not a growth metric. But the threshold is a real launch deadline. It changes the arithmetic on your pricing page, the wording in your checkout and the story in your board deck. Put it on the calendar before it puts itself there.