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Expert Accounting & Year-Round Peace of Mind – now at ‎‎ 20% OFF! .

Expert Accounting & Year-Round Peace of Mind – now at ‎‎ 20% OFF! . Offer ends in:

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Incorporation

Start your company

Formation Packages

Company Formation for UK residents

Your foundation to run and grow with ease.

Essential Formation Package

Business Compliance Package

Start up with Accounting, Tax and Privacy built in.

Full Compliance Package

Incorporate with end to end admin managed.

The Ultimate Startup Business Plan Template

Accounting

Run & Grow your business

Who We Help

Accounting

Full-service accounting for accurate and compliant financials.

Self Assessment Tax Returns

Compliant and Efficient UK Self Assessment.

Bookkeeping

Expert Bookkeeping and Monthly Reports.

Limited Company

Dedicated Accountant for LTD companies.

Sole Trader

Expert accounting, bookkeeping and filing.

Contractor

Specialist Support with IR35 Expertise.

Startup

Scale smarter with a dedicated startup accountant.

How to Use SEIS to Raise Money for Your Startup

Understanding Your Tax Code 0T: Meaning, Impact, and How to Fix It

Advisory Services

Stay compliant

Specialist advice for key business and tax decisions.

Research and Development

R&D Tax Credits Service.

SEIS/EIS Advance Assurance

Expert advance assurance application.

How to Use SEIS to Raise Money for Your Startup

Pricing

Start your company

Run & Grow your Business

Company formation prices

Flexible plans from setup to growth.

Accounting prices

Pricing that scales with your business needs.

Need help before choosing?

Resources

Knowledge base

Blogs

Expert articles to help you build and grow your business.

FAQs

Find answers to our most popular questions.

Community

Join a community of entrepreneurs and business builders.

How to Claim Tax Relief in the UK: A Clear Guide for Individuals & Small Businesses

Company Info

Know Sleek

About Us

Learn who we are and how we support entrepreneurs.

Our Culture

Learn what shapes the way we work.

Reach out to our team for help or enquiries.

Trust & Security

See how we protect your data and ensure compliance.

Get in touch

[email protected]

205 Regent St., London W1B 3HH, United Kingdom

Expert Accounting
from Formation to Success

Your dedicated UK accountants handle it all from company setup to seamless bookkeeping, payroll, and tax compliance – all in one place.

Trusted by 420,000 UK founders

Rated

by 3,000+ verified clients on

Services for every stage of your business journey

Start a new business

From fully managed UK incorporation to SEIS/EIS advance assurance, we’ll help you start strong and get investor-ready.

Run and Grow your existing business

Stay compliant and stress-free with UK accountants managing your bookkeeping, VAT, tax returns, and more.

Included with all our plans

100% digital access to your information

Full online access to company documents, filings, and updates, always secure and compliant with Companies House and HMRC.

Dedicated UK-based
support team

Get expert help whenever you need it. Our local team is here to support you every step of the way.

Free business account referral*

Open a UK business account in minutes with our partner, Countingup

*Subject to approval

30 days money back guarantee

Try Sleek with confidence. If you’re not satisfied, we’ll make it right or your money back.

Loved by entrepreneurs across the world

Stephen Hendry

CEO & Founder, SEFP LTD

“Emma has been amazing with the set up and formation of our company. She’s always at the end of the phone and has gone well beyond what’s required. Highly recommend and can’t wait to use her again for the next company purchase”

Oluwatosin Omotola

Entrepreneur, Founder, Omotola Ajayi Travelts Ltd

“I consider myself very lucky to have come across this wonderful organisation that helped me register my company. I was so confused and didn’t know how to go about it.”

Maximilian Cater

CEO & Founder

“Dealt with Emma Clark, Easy efficient and couldn’t praise how easy process to deal with open 2 companies and can’t praise how well she dealt with both.”

Seb Francis

Co-Founder & Director, Titus Learning Ltd

“Nicky was extremely good at explaining the most productive ways of me getting my business set up and very friendly throughout the entire process, this experience alone, was far better and more informative than all the other companies I have spoken to.”

Kira

Entrepreneur

“What made special about our experience with the company is working with Nicky Perucho, Head of UK Incorporations. Every our request was met with care and speed in execution. Many thanks for looking after our account!”

Victoria Haynes

CEO & Founder, Neon Hop

“Emma was brilliant!! This was my first business set up so there was a lot of things I was unsure of and she helped me from the beginning to the end, I even called a few times after the set up and she was always very welcoming and helpful”

Experience expert accounting that empowers your business to thrive

Get peace of mind with a dedicated UK-based accountant who handles your bookkeeping, tax, and compliance,so you can focus on growing your business.

Smart technology that powers our award winning service

Our seamless online platform makes managing your accounts effortless , giving you real-time financial insights, easy document access, and secure collaboration with your dedicated accountant.

Smart business banking with

A fast, easy, and compliant way to open your business account – FREE when you sign up with Sleek.

Open in minutes – Apply online and start receiving payments right away
One app, all-in-one solution – Send invoices, track expenses, and stay tax-ready
Stay in control – Categorised expenses, tax reminders with financial insights.

Committed to making a positive impact

We prioritise support and kindness when interacting with our clients and communities. We provide an environment where they can thrive. As a B Corp Certified Community, we not only care for our clients but also for the planet while ensuring our practices are sustainable.

Supporting Businesses Like Yours

Limited Company

Expert accounting to keep your limited company compliant and growth-ready.

Learn more

Startup Accountant

Smart, affordable accounting built for ambitious UK startups.

Learn more

How to get started with Sleek?

It’s easy and takes just a few minutes to complete the process in full

Step 01

Book your free consultation

Step 02

Discuss your requirements with our advisor

Step 03

We'll take care of the rest

Helpful articles

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Current UK Tax Brackets 2026: Income Tax Bands and Rates for 2026/27

December 30, 2025

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Freelance Tax: Understanding Your Taxes As A Freelancer & Calculating Your Take-Home Pay

August 26, 2025

How Much Do Accountants Charge for Self Assessment in 2026?

August 12, 2024

Stay in the know

Learn more

20 years helping businesses thrive

With over 20 years of experience and a UK-based team, we specialize in making business incorporation with Companies House simple and efficient. Operating across the UK, Singapore, Hong Kong and Australia, we offer tech-driven solutions tailored for startups and small businesses, so you can focus on building and growing your venture from day one. Learn more about Sleek.