Your Invoicing, Handled with Care
Tired of invoice admin taking over your day?
Let Simplex handle it for you. We’ll keep everything organised, processed on time, and error-free—so you can focus on running your business. No more chasing payments or getting buried in paperwork. And if you ever need us, support is just a call, text or email away—always included, with no extra fees.
Save Time Every Week
We’ll take the whole invoicing job off your plate—no scanning, sorting or double-checking.
Stay Organised & Up to Date
Every invoice is logged, processed and paid on time. You’ll always know what’s going on.
Help When You Need It
Got a question? Just call, WhatsApp or email. No limits, no extra costs—just real support from real people.

Invoice Processing,
Done For You
Let’s face it, invoices can be a hassle. They take up time, get lost in inboxes, and slow things down when they’re not handled properly. At Simplex, we take the stress out of the process by managing your entire invoicing flow for you. We’ll collect, sort, and match every invoice so you don’t have to. Just forward them on and we’ll handle the rest.
✅ No more chasing paperwork
✅ No data entry or software to learn
✅ Just accurate, on-time invoicing handled for you
Trusted by UK Businesses Nationwide
Simplex is proud to be the 2022 Xero Award Winner – Sole Practitioner of the Year, and winner of Young Entrepreneur of the Year – South East. But what we’re proudest of? Our client testimonials.
Jeanette
Isle of Wight
Lucy has been a godsend for our company. She is professional, trustworthy, competent and friendly. She has dealt with many problems s for us with a positive result. She is always available to answer any queries and deals with problems very quickly. We would highly recommend her services.
Sapna
Birmingham
Lucy and the team are amazing at just getting the job done. I know I don’t have to worry about my invoices or tax – the one thing I was worried about. All the stress is taken away and I know that Simplex Accounting are dealing with everything accurately!
Fiona
Worcester
I cannot recommend Simplex enough. Lucy has been so helpful, and got me sorted when my accounts were in such a mess! She explained everything to me, and has just made the entire process so easy. As a small business owner, having someone like Lucy helping me is exactly what you need!
Company Payroll Services Made Easy
Invoices shouldn’t slow you down. If you’re spending too much time chasing paperwork or fixing mistakes, we can help. At Simplex, we take care of your invoicing from start to finish, so everything is handled properly and on time.
Less admin, fewer errors, more time for what matters.

Smart Tools, Simple Setup
We use trusted tools to make your accounting and payroll seamless. You’ll always use Xero for your core accounts, but for payroll, we’ll recommend the best option for your business – and provide full support and training to make it easy.
Xero
Your all-in-one accounting platform. Send, track, and reconcile invoices easily—everything in one place and fully connected to your books.
hubdoc
Great for everyday use. Snap, forward, or upload your invoices—Hubdoc pulls out the data and feeds it straight into Xero. Included free with all Xero plans.
dext
Think of Dext as Hubdoc on steroids. For businesses with lots of documents or multi-layered approvals, Dext offers extra speed, control, and insight. We’ll help you decide if it’s the right fit.
Getting Started is Easy!
We’ve made it simple for you to get the help you need:
Book a free consultation
Let’s talk about your business and how we can help.
Share Your Info
You can securely share your financial information with us online.
We Handle the Rest
We’ll take care of your bookkeeping and accounting, so you don’t have to worry.
Enjoy Peace
of Mind
Get regular updates and helpful advice, so you always know where your business stands.
Get started today! It will only take a minute
Switching Accountants is Easier Than You Think
Unhappy with your current accountant or just ready for a change? We make switching accountants simple and hassle-free. Our seamless process ensures your business finances stay on track without any interruptions. We’re here to support your growth and make your financial management effortless. Here’s how we handle it:
Seamless Transfer
We handle everything, ensuring your financial records are securely moved from your previous accountant.
No Disruption to Your Business
You won’t experience any downtime during the switch. We’ll work efficiently to ensure your finances are up to date without missing a beat.
A Fresh Start
Once everything is sorted, we’ll review your current financial situation and set you up with a plan that aligns with your business goals.
Ready to switch?
Get in touch today and let’s make it happen!
Accountancy Blog Posts
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!
The average cost to process an invoice manually in the UK ranges from £4 to £25, depending on complexity and internal systems. At Simplex, we streamline the process by charging a flat rate of £1 per transaction, billed in blocks of 25. This keeps costs predictable and affordable, helping small businesses manage cash flow without the hassle of in-house admin or outdated processes.
Outsourcing Accounts Payable (AP) typically costs between £1 and £5 per invoice. At Simplex, we make things simple with a fixed fee of £1 per transaction, charged in blocks of 25. So if you process 40 invoices monthly, you’ll pay for 50. This structure offers clarity, scalability, and cost-efficiency—ideal for busy directors looking to reduce overheads and free up time for growth.
Yes, invoice processing can be fully automated using cloud-based tools that handle data entry, approvals, and archiving. At Simplex, we use automation to speed up invoice workflows and reduce manual errors. This means fewer delays, better accuracy, and more time for you to focus on running your business, not chasing paperwork. Automation also gives you real-time oversight of spending and supplier payments.
Invoice processing involves three key steps: capturing the invoice data, reviewing and approving it, and then completing the payment. At Simplex, we simplify and automate these steps using efficient systems, so you don’t waste time on repetitive admin. Whether you receive a few or dozens of invoices monthly, we ensure everything flows smoothly from receipt to reconciliation, keeping your finances tidy and on track.
In the UK, manual invoice processing can cost between £7 and £20 per invoice when you factor in time, staff, and errors. With Simplex, we charge just £1 per transaction, sold in blocks of 25. This transparent pricing model helps small businesses budget better, while we take care of processing and approvals using automation and expert support—all without the overhead of an in-house team.
The number of invoices processed daily depends on your business type and size. Some clients handle 10 a month, others 50 a day. At Simplex, we adapt to your volume and charge in blocks of 25 transactions. Whether you’re scaling or streamlining, we ensure your invoices are processed quickly, accurately, and on time—so you can focus on growth, not admin.
Manual invoice processing can take several days, especially when approvals or data entry slow things down. At Simplex, we use efficient systems and automation to significantly speed up the process—often completing most invoices much faster than traditional methods. While exact timings can vary, our goal is always to keep things moving swiftly so your suppliers stay happy and your cash flow stays on track.
Processing supplier invoices manually often costs between £4 and £25 each. At Simplex, we charge just £1 per invoice, billed in blocks of 25. For example, if you process 40 invoices, you’ll pay for 50—keeping costs predictable and simple. This setup gives you better budgeting power while we handle the heavy lifting, ensuring your suppliers are paid accurately and on time every month.