From Companies House to First Invoice: A Frugal UK Founder’s Launch Stack for 2026

Getting to first customer is less about having the perfect software stack and more about not setting money on fire before you know anyone wants the thing. At LaunchByte, we talk to plenty of pre-revenue founders who have signed up for six SaaS tools, opened a business bank account and built a brand before they have had a single proper customer conversation. That is backwards.

The good news for UK founders in 2026 is that the free tiers are genuinely useful. You can validate an idea, incorporate, take payments and start marketing for close to nothing—provided you use each tool at the right stage and keep an eye on the UK-specific bits that catch people out.

Stage 1: Validate before you incorporate

Before Companies House enters the chat, your job is to find out whether the problem is real. A free Tally form and a Calendly link will do more for you than a logo designer. Use Notion or Google Docs to keep a simple interview log: who you spoke to, what they currently pay for, what breaks, and what they would sacrifice to fix it.

This is also the stage to lean on LinkedIn without being weird about it. Search for UK buyers by job title, join relevant meetups, and ask for 15-minute conversations. You are not selling yet. You are collecting evidence. If nobody will give you 15 minutes, that is a signal—and it is much cheaper to hear it now than after you have registered a company and ordered business cards.

Stage 2: Make it official without overpaying

When you are ready to trade, Companies House online incorporation costs £50. That is not free, but it is hardly a war chest. Register for Corporation Tax within three months of starting to trade, and keep your business banking separate from day one.

UK business banking has become genuinely competitive at the free end. Starling Business, Tide and Monzo Business all have free or low-cost tiers, and most now connect to accounting software through Open Banking. That matters because manual reconciliation is a tax on founder time. Pick a bank that plugs into your accounting tool rather than one that looks nice and forces you to export CSVs at midnight.

On accounting, look for bank-bundled deals or free trials before committing to a paid plan. FreeAgent and Coconut are both worth checking depending on your bank and setup. And keep half an eye on VAT: the registration threshold is £90,000, so you do not need to charge VAT before then, but you do need to watch rolling 12-month turnover. Crossing it by accident is an avoidable headache.

Stage 3: Ship a landing page and start conversations

You do not need a custom website to test demand. Carrd’s free tier will get a clean one-page site live in an afternoon. Framer’s free tier is also useful if you want something slightly more designed. Put a clear promise at the top, a short explanation underneath, and one call to action: join the waitlist, book a call, or ask for early access.

For email, MailerLite’s free tier covers most early-stage lists. Keep it simple: one welcome email, one follow-up, and a way to unsubscribe. Do not build a six-email nurture sequence before you have sent a single message to a real human.

Use Calendly for customer interviews and Stripe Payment Links when someone wants to pay you. Stripe charges per transaction, not per month, which makes it a sensible first payment tool. If you need a formal invoice, the HMRC invoice template is free and compliant. If you are VAT-registered, use software that handles VAT properly rather than bodging it in a spreadsheet.

Stage 4: Sell before you scale

Your first invoice is a milestone, not a rounding error. Keep the process boring: a simple invoice, clear payment terms, and a separate business account. Zoho Invoice has a free plan for small operations, and the HMRC template works if you are not ready for software. The goal is to get paid without creating admin debt.

This is also the point to stop adding tools. A founder with a free CRM, a free form builder, a free email tool and a free payment link can run a surprisingly tight operation. The danger is signing up for a paid plan because it feels like progress. It usually isn’t. Progress is a customer saying yes and paying.

Stage 5: Market without a retainer

Early marketing should be founder-led and cheap. LinkedIn posts about what you are learning, a handful of relevant UK communities, and one or two local meetups will outperform a generic ad campaign at this stage. Google Search Console is free and tells you what people are already searching for. If you are writing anything, use it to answer real questions from customer interviews.

Product Hunt launches and paid social can wait. Your first channel is conversations. Your second is content that proves you understand the problem. Your third is whatever your customers tell you works.

The 12-tool shortlist

1. Tally for quick customer forms and waitlists.
2. Calendly for booking interviews without email tennis.
3. Notion for a lightweight interview and decision log.
4. Companies House for online incorporation at £50.
5. Starling Business, Tide or Monzo Business for a free or low-cost business account.
6. FreeAgent or Coconut for accounting, especially if your bank bundles it.
7. Carrd for a free one-page landing site.
8. MailerLite for a free early email list.
9. Stripe Payment Links for taking payments without monthly fees.
10. HMRC invoice template for free, compliant invoicing.
11. Google Search Console for free search data.
12. LinkedIn for founder-led outreach and content.

Where UK rules change the stack

Companies House is cheap but not optional once you trade. Open Banking has made business banking and accounting less painful, so use it. The VAT threshold is a real cliff edge, not a vague guideline. And grant funding—Innovate UK, local growth hubs, whatever is relevant to your sector—should buy you time to talk to customers, not replace the need to find one.

The £0 launch stack is not about being cheap for the sake of it. It is about staying close to the customer while your overheads are low. Get the first paying customer with the simplest tools that work, then upgrade when the revenue justifies it. In 2026, that is still the most founder-friendly stack going.