You Started Your Business for Freedom, Not Financial Stress
Bookkeeping. Tax deadlines. Unclear tax bills. That is not why you became self-employed.
Many sole traders feel unsure what they owe, what they can claim, or whether they are missing something important. Accounting for sole trader businesses should feel clear and manageable, not confusing or rushed at the last minute.
At Simplex, we take care of the numbers, reduce your tax bill and give you straightforward advice so you can focus on winning clients and growing your business with confidence.
Save Tax the Smart Way
We make sure you claim every allowable expense and structure your finances efficiently. From mileage to home office costs, we help you legally reduce your tax bill and keep more of what you earn.
Clear, Fixed Monthly Fees
No surprise invoices. No hidden extras. You get unlimited calls, texts and emails included, so you can ask questions whenever they come up without worrying about extra charges.
Stress-Free HMRC Compliance
We handle your Self Assessment tax return, manage deadlines and keep your records accurate. You receive reminders, updates and simple explanations with no confusing jargon.
What’s Included in Our Service
Everything you need to stay compliant, reduce tax and feel fully in control of your finances.
✅ Self Assessment tax return preparation and submission
✅ Ongoing bookkeeping support
✅ Proactive tax planning and profit guidance
✅ Thorough allowable expense reviews
✅ Practical business growth advice
✅ CIS support where applicable
✅ Help registering as a sole trader
✅ Easy-to-use apps for invoicing and expense tracking
✅ 48-hour response guarantee
We use simple, modern tools that make tracking income and expenses easy from your phone or laptop, so you stay organised without the paperwork headache.
“Great service, I now don’t have to worry about missing a tax return. Everything is handled professionally, and all questions asked are answered quickly. Would highly recommend.“
Abi, Sole Trader
Accounting That Puts You First
When you choose Simplex, you’re not passed between departments. You get direct access to a friendly expert who understands your business.
Have a quick tax question? Send a WhatsApp.
Need clarity on expenses? Book a call.
Unsure about registering for VAT? We’ll guide you step by step.
Our mission is simple:
Simplify your finances. Save tax. Help your business grow.
We Work Remotely, So You Get Faster, Smarter Support
You do not need to travel to an office or take time out of your day for meetings. Simplex works fully remotely, which means you get flexible, responsive support wherever you are in the UK.
Everything is handled securely online using simple, easy-to-use apps. You can upload documents, track income and expenses, and ask questions from your phone or laptop. It is efficient, organised and designed around busy business owners.
Working remotely also means we respond quickly. You can call, text or email whenever something comes up, and we guarantee a response within 48 hours.
No commuting. No paperwork piles. No waiting weeks for answers.
Just straightforward accounting support that fits around your business and your schedule.
“Lucy and the team are always so helpful and efficient. I trust them to take care of all my accounting, so I don’t have to worry about anything! Great service.“
Catherine, Florist
Simple Accounting
We set you up with easy, reliable tools so your finances stay organised without adding to your to-do list. Everything is customised for the way you work, and we’re always here if you need help.
Xero
Stay organised without spreadsheets.
See your income, expenses and invoices in one place, always up to date and ready when you need it.
dext
No more chasing receipts.
Snap a photo or forward an email, and your bills and receipts are stored, sorted and matched to your accounts.
brightpay
Stress-free payroll.
Payslips, pensions and submissions are taken care of, always on time and fully compliant with HMRC
Getting Started is Easy!
We’ve made it simple for you to get the help you need:
Book a Free Call
Tell us about your business and what you need.
Send Your Info
Share your financial details securely online.
We Do the Work
We’ll sort your accounts and keep everything up to date.
Stay in Control
Get updates and support, so you always know where you stand.
Book your free discovery call! It will only take a minute
Time to Switch Accountants?
You don’t need to stay stuck with support that’s slow or confusing. Switching to Simplex is smooth and handled for you.
Seamless Transfer
We contact your previous accountant and securely move everything over, CIS, VAT, payroll and more.
No Disruption
Your accounts stay up to date while we handle the switch, so nothing gets missed.
A Fresh Start
We review your numbers, identify gaps, and get you set up with a clear plan that works for you.
Ready to switch? Let’s make it happen.
Helpful Resources
Your Questions, Answered
We know you might have some questions, and we’re here to make everything as clear and straightforward as possible. If you need more information, don’t hesitate to reach out—we’re always happy to help!
Yes, you can manage your own accounting as a sole trader, especially if your finances are straightforward. You’ll need to track income, expenses, and submit a Self Assessment tax return each year. However, mistakes can be costly and time-consuming to fix. Many sole traders choose an accountant to save time, reduce stress, and make sure they’re claiming all allowable expenses properly.
As a sole trader, you must keep accurate records of your income and expenses, submit an annual Self Assessment tax return, and pay Income Tax and National Insurance. If your turnover exceeds the VAT threshold, you’ll also need to register for VAT. Good bookkeeping is essential. We help clients stay organised, compliant, and confident that everything is filed correctly and on time.
An accountant helps you prepare and submit your tax return, calculate what you owe, and ensure you claim all allowable expenses. We also offer tax planning support, record-keeping support, and help you improve profitability. Beyond compliance, a good accountant gives you clarity and peace of mind. That means fewer surprises from HMRC and more time to focus on growing your business.
You’re not legally required to have an accountant as a sole trader, but many business owners find it invaluable. Tax rules change regularly, and it’s easy to miss savings or deadlines. An accountant helps you stay compliant, organised, and tax-efficient. For many clients, the cost of professional support is outweighed by the time saved and reassurance that everything is handled properly.
The main disadvantages include unlimited personal liability, less tax planning flexibility compared to a limited company, potentially higher personal tax rates, fewer credibility benefits, and limited access to certain funding options. While being a sole trader is simple to set up, it’s not always the most tax-efficient long term. We can support you in deciding if it’s still the right structure for your goals.
