Startup Funding Guide 2026: Proven Strategies to Secure Capital Fast

Securing startup funding in the UK can be challenging, especially when you’re focused on building your product, managing cash flow, hiring the right team and acquiring early customers. With so many priorities, there is often little time left to prepare for fundraising.

When that time finally comes, the process can feel overwhelming. Many founders struggle with investor readiness, finding the right investors for their stage of growth and navigating a fundraising process that often feels complex and time-consuming.

This comprehensive guide will break down the various start-up funding stages, outline the different funding options available and detail the key steps early-stage UK businesses should take to be fully prepared for investment.

What are the different stages of start-up funding?

Raising start-up funding is not a one-size-fits-all process. The amount you raise and where you source it from largely depend on your company’s growth stage. Here’s a breakdown of the main funding stages:

Pre-seed funding

Pre-seed funding is the very first stage of investment that gives founders the initial capital required to turn their idea into a viable business. Typical investment at this stage ranges between £50,000 and £350,000.

At this stage, start-ups usually:

• Work on building a Minimum Viable Product (MVP).
• Strengthen an existing MVP to demonstrate early traction.

Seed funding

Seed funding is usually the next step after pre-seed. It allows start-ups to fine-tune their business model, grow their team and demonstrate further market traction.

This round is largely backed by external investors, and the amount raised generally falls between £350,000 and £1 million, depending on the industry and investor interest.

Series A

Series A funding is the first substantial round of venture capital investment, generally raising £5 million to £15 million. The investment is aimed at scaling operations, hiring key talent, and strengthening market presence.

At this stage, start-ups must demonstrate strong traction and a viable growth model. Investors conduct detailed due diligence and founders generally part with 20–25% equity in exchange for the capital.

Series B

Series B funding follows the Seed and Series A rounds and is focused on taking a validated business model to the next level. By this stage, the company has proven its market fit, and the priority shifts from product development to scaling operations and expanding market share.

Knowing which funding stage suits your start-up helps you prepare better. Once you’re clear on your stage, you can move on to exploring the different types of funding available.

What are the different types of start-up funding?

Here are some common funding options available for early-stage companies:

SEIS

The Seed Enterprise Investment Scheme (SEIS) was introduced in 2012 to support young businesses in attracting investors and secure early-stage capital through SEIS funds. For founders, meeting the SEIS eligibility criteria can open the door to a wide pool of investors who can claim 50% income tax relief on investments of up to £200,000 per tax year.

To qualify, your company must:

• Be less than three years old.
• Raise no more than £250,000 under the scheme.
• Have gross assets below £350,000 and fewer than 25 employees.

SEIS is growing in popularity with 10,145 investors claiming tax relief in 2023–24. This number is expected to rise further when 2024-25 figures are released.

EIS

The Enterprise Investment Scheme (EIS) is designed for start-ups and growth-stage companies looking to raise larger sums through EIS funds. Eligible businesses can secure up to £12 million, with a yearly cap of £5 million across all funding sources, including subsidiaries and acquisitions.

For knowledge-intensive companies (KICs), the funding threshold is even higher, up to £20 million with no more than £10 million raised in a single financial year.

Investors who purchase EIS shares can claim up to 30% income tax relief on investments of up to £1 million per year, or £2 million if at least £1 million is invested in KICs. Meeting the EIS eligibility criteria can help your business access motivated investors and the capital needed to scale.

SEIS / EIS Advance Assurance

For investors to be eligible to claim income tax relief through SEIS & EIS, you must first receive Advance Assurance from HMRC.

To apply for advance assurance, you’ll need the following documents:

• A business plan or pitch deck with financial forecasts
• Full details of your company’s structure and business activities.
• A clear explanation of how the investment funds will be used.
• Letters of Intent from potential investors.
• The total amount you plan to raise.
• Your latest accounts, if available.
• Details of any companies that will use the investments.
• An up-to-date copy of your memorandum and articles of association, along with any anticipated changes.
• A copy of the company’s current register of members.
• Any other agreements in place with shareholders or Venture Capital Trusts.

In the 2024–2025 tax year, HMRC received 3,195 SEIS advance assurance applications, with 2,705 approved, an 85% approval rate. That’s up from 2,745 applications in the previous year, with an approval rate of 80%.

For EIS advance assurance, 3,090 applications were submitted in 2024–2025, slightly down from 3,150 the year before. As of March 2025, 76% of this year’s applications have been approved, with some still under review.

A well-prepared application can boost your credibility and make your business more attractive to investors. However, checking the conditions of each scheme and preparing the documents can be time-consuming, taking you away from running your business.

That’s where we can help.