Expert Accounting & Year-Round Peace of Mind – now at 20% OFF! – Limited time offer
Staying on top of self assessment can be time-consuming. Hand over the stress and gain time to grow focus on what you do best.
If you're self-employed, we can help you with filing your self-assessment. Through our precise, efficient service, you'll save time and money.
Trusted by thousands of UK businesses
Focus on your growing your business while we handle all your accounting needs.
Swift set up
We help transition you from paper to digital accounting seamlessly with our digital tools.
Cost transparency
No hidden fees along the way. We believe in transparency; hence we have fixed accounting prices.
Efficiency
We simplify your year-end processes using the cloud. Expect short lead times when we produce your accounts.
Peace of mind
Our team of expert is at your disposal so that you can stay focused on your business' growth
From £250 plus VAT
1
Book a free consultation
Tell us about your business and we’ll provide you with a simple solution.
2
Meet your accountant
After a quick and easy set up, your new accountant will get in touch.
3
Focus on your business
From there you'll get started and can leave your books with us.
What is self assessment tax return?
A self-assessment tax return exists to collect tax from businesses and people who do not have tax automatically deducted from their income. Self-assessment returns must be filled out once a year and sent to HMRC. Accountants such as Sleek can streamline the process, allowing individuals and organisations to save time and money.
Who must send a tax return?
If you operated as a sole trader or business partner in the last financial year (April-April), you must submit a tax return before the end of January the following year. If you have income from some other source, such as savings or money from a rental property, you also must report this. Using an accountant such as Sleek allows you to fill out a self-assessment easily and without error.
What should I include in my self assessment tax return?
When filling out your self assessment tax return, you’ll need your Unique Taxpayer Reference, national insurance number and invoices that show your income and expenses. Working with an accountants such as Sleek allows you to streamline the entire process and avoids you making errors or accidentally paying too much.
Do I need to do a tax return if I earn under 1000 UK pounds?
You do not need to fill out a tax return if you are a sole trader who earned less than £1,000 in the previous tax year. This figure only applies to what you earned before taking tax relief off, however.
Title 11
Title 12
Title 13
Title 14
Title 15
Ricky Hill
Co-Founder , SYNCR
“They always submit our filings in on time, and their tax advice is spot on. Seriously, they’ve made things so much easier for us. I’d totally recommend Sleek to anyone looking for awesome accounting help!”
Neil Smedley
Founder, King Koby Ltd
“I truly wouldn’t be able to run my business without Sleek. Whilst I’m great at marketing and the sales side of running a business, I’m just not a numbers guy! Sleek has changed the way I look at an accountant.”
David Henley
Director, Brio Books, Pty Ltd
“The responsiveness or their team made them stand out. They provide the local support we need and truly alleviate the pressure for us as business owners.”
Seb Francis
Co-Founder & Director, Titus Learning Ltd
“We’ve been with Sleek since the very beginning of our business. They helped with Seed EIS, R&D and implementing an online cloud bookkeeping system through Xero. Sleek has undoubtedly helped us grow our business.”
Sarah Quinn
Director, Dead Cat Audio Ltd
“I’ve been with Sleek for years and as they have expanded their team their attention to providing a good service has continued. Bryony is brilliant with my accounts; great communication and always there to help. I would definitely recommend their service.”
Victoria Haynes
CEO & Founder, Neon Hop
“I met Ed from Sleek when he was visiting our coworking space in London. After a quick chat, Ed explained how I could move my accounts online and also discussed R&D tax credits. His advice has been invaluable!”
Daniel S,
Sleek Advisor
Advisory
Resources
About
By founders, for fellow founders.
Optimise with Sleek, and reap the benefits of digitalisation.
© 2025 Sleek Accounting Limited. Registered in England No.10262742 | Address: 205 Regent Street, 4th Floor, London, W1B 4HB, UK | +44 330 808 4475 |
We have attained ISO27001:2013 certification. View our: Information security policy
