Incorporated and Now What? A 90-Day Founder Playbook for UK Limited Companies in 2026

Incorporating a UK limited company is almost too easy. A few details, a small fee, and Companies House sends back a certificate. Then the real work starts. The first 90 days are not about perfect compliance. They are about making sure the boring stuff does not quietly become a problem while you are trying to sell, build and hire.

Here is a founder-friendly playbook for 2026. It separates the tasks that protect the business from the ones that can wait, and it keeps the focus on growth rather than admin for its own sake.

Days 1–14: Lock the foundations that protect you

Start with the things that are painful to fix later. Companies House filings are simple but easy to neglect. Check your registered office address, your SIC codes and your people with significant control register. Put the confirmation statement in your diary now — it is annual, cheap to file on time and annoying if you miss it.

The bigger task is the founder agreement. If there is more than one founder, document the equity split, vesting, roles, decision-making and what happens if someone leaves. Assign intellectual property to the company properly. Issue shares correctly and keep board minutes. This is not legal theatre. It is the difference between a clean cap table and a very expensive conversation in 18 months.

Open a separate business bank account in week one. Do not run company money through your personal account, even for a few weeks. It makes bookkeeping, VAT and investor due diligence harder than it needs to be. Set up accounting software at the same time. A simple cloud ledger from day one is worth more than a shoebox of receipts.

Days 15–30: Tax registrations and a banking rhythm

Register for corporation tax. Check whether you need to register for VAT — the threshold can change, so confirm the current figure on GOV.UK rather than relying on a blog post. If you are not near the threshold, you may still choose to register voluntarily, but only if it helps your customers or your input tax position. Do not register just because it feels grown-up.

If you are paying yourself or anyone else, register as an employer for PAYE before the first payday. Set up payroll properly, even if it is just a director salary. This is also the moment to think about pension auto-enrolment if you are hiring.

R&D tax credit readiness starts now, not at the end of the year. You do not need to claim yet. You do need to keep records: what technical uncertainty you are tackling, what you tried, what failed, what it cost. A shared folder with dated notes and project logs is enough. This is the single most useful admin habit for technical founders.

Days 31–60: Build the boring machine

Now make the routine repeatable. Reconcile the bank account weekly. Save receipts in one place. Record mileage and expenses as they happen. Set aside time for a monthly review: cash in, cash out, runway, unpaid invoices and upcoming filings.

Get the contracts in order. You need terms and conditions for customers, a contractor agreement, an NDA template if you share sensitive information, and a privacy notice if you handle personal data. Check whether you need to register with the ICO. This is not about drowning in paperwork. It is about not relying on a handshake when a customer disputes an invoice.

Insurance is worth a look early. Professional indemnity or public liability may be required by clients or landlords. You do not need every policy on day one. You do need to know what your contracts require.

Days 61–90: First hire and growth decisions

If you are hiring, slow down for a week. A bad first hire is expensive in money, time and morale. Before you offer, sort the employment contract, right-to-work checks, payroll, pension enrolment and employer's liability insurance. Decide whether the role is genuinely an employee or a contractor — and do not use a contractor agreement to avoid employment rights. HMRC and tribunals look at the reality of the relationship, not the label.

If you are not hiring yet, use this window to tighten the growth engine. Review your pricing, your pipeline and your runway. A 90-day review should ask three questions: what is working, what is costing more than it should, and what decision have you been avoiding?

What can wait — and what absolutely cannot

Can wait: a trademark registration, a formal advisory board, complex share option schemes, an office lease and a full branding exercise. None of these are urgent in the first quarter unless a customer or investor demands them.

Cannot wait: a founder agreement, a separate bank account, PAYE registration before the first payday, records for R&D claims, a diary reminder for the confirmation statement, and a basic bookkeeping habit. These are the tasks that protect the company from avoidable stress.

The 90-day checklist

• File incorporation details correctly and save the certificate.
• Put the confirmation statement date in your calendar.
• Sign a founder agreement if there is more than one founder.
• Assign IP to the company.
• Open a business bank account and keep it separate.
• Set up cloud accounting and reconcile weekly.
• Register for corporation tax and check VAT.
• Register for PAYE before the first payday.
• Start an R&D project log from day one.
• Put customer and contractor contracts in place.
• Check insurance requirements in your client contracts.
• Diarise payroll, VAT and confirmation statement deadlines.

Keep momentum, not perfect paperwork

The first 90 days are not about becoming a compliance expert. They are about building a company that can grow without tripping over its own admin. Get the protective foundations right, set up a simple rhythm, and then get back to customers. The paperwork will still be there next month. Your momentum might not be.