Big Profits Are Great. Unexpected Tax Bills Aren’t.
Running a profitable limited company is something to be proud of. But finding out you owe more Corporation Tax than expected can quickly take the excitement away.
At Simplex, we provide straightforward Corporation Tax services for limited companies across the UK, helping you calculate what you owe, meet HMRC deadlines and plan ahead.
From preparing and submitting your Corporation Tax return to identifying eligible tax reliefs, we’ll help you stay organised, avoid unnecessary surprises and feel more confident about your company’s finances.
Know What You Owe
Understand your Corporation Tax liability with accurate calculations and clear guidance, so you can prepare for your upcoming tax bill.
Meet Your Deadlines
Stay on top of Corporation Tax filing and payment deadlines, with reliable support to help you avoid unnecessary penalties.
Plan Ahead
Make informed decisions about expenses, investments and future profits, with ongoing support to help you manage your tax position.
Corporation Tax Doesn’t Have to Be Complicated
From allowable expenses and tax reliefs to filing deadlines and changing profits, there’s plenty to consider.
And leaving everything until your year-end can make it harder to prepare for the bill.
At Simplex, we help you understand your Corporation Tax position, identify relevant tax reliefs and stay on top of your responsibilities.
Know what you owe. Plan ahead. Avoid surprises.
Accounting & Corporation Tax Services
From everyday bookkeeping to annual accounts and tax planning, we’ll help you keep your limited company’s finances organised and under control.
Corporation Tax & Annual Accounts
Get your annual accounts and Corporation Tax returns accurately prepared and submitted, with clear guidance on what your company owes and when.
Bookkeeping & Xero Accounting
Keep your income, expenses and financial records organised with accurate monthly bookkeeping support, so you always have a clearer picture of your finances.
VAT & Payroll Services
Stay on top of VAT returns, employee wages, PAYE and payroll reporting, with reliable support to help you manage your company’s responsibilities.
Tax Planning & Ongoing Support
Understand your tax position, identify eligible reliefs and get straightforward guidance on paying yourself, managing costs and planning for growth.
“Simplex are super easy to work with. I love that I have a portal to track all documents and paperwork that need my attention. Everything else just seems to run in the background so I can focus on my business.”
Jordan, Designer
Three Ways We Make Corporation Tax Easier
Know Your Numbers: Understand your Corporation Tax liability with accurate calculations and clear explanations, so you can prepare for your upcoming bill.
Stay Ahead of Deadlines: Keep on top of Corporation Tax returns and payment deadlines, reducing the risk of missed filings and unnecessary penalties.
Plan with Confidence: Make informed decisions about business expenses, investments and future profits with ongoing tax support.
Why Choose Simplex?
Managing Corporation Tax is easier when you have reliable support throughout the year. At Simplex, we help keep your records organised, calculate your tax liability and make sure your returns are submitted accurately.
With straightforward explanations and ongoing guidance, you’ll have a clearer understanding of what your company owes and how to plan ahead.
And because we’re fully remote, you can access our accounting support wherever your business is based in the UK.
“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
Smart Tools, 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 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 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 transfer your records, handling the switch for you.
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.
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!
UK limited companies generally pay Corporation Tax at 19% on profits of £50,000 or less and 25% on profits of £250,000 or more. Companies with profits between these amounts may qualify for Marginal Relief, giving an effective rate between 19% and 25%. The thresholds can be reduced for short accounting periods or associated companies. We help small businesses calculate Corporation Tax accurately, claim available reliefs and plan ahead so there are no unexpected tax bills.
You may be able to reduce your Corporation Tax bill legally by claiming allowable business expenses, capital allowances and available tax reliefs. Companies with profits below £250,000 may also benefit from Marginal Relief, depending on their circumstances. Pension contributions and qualifying business investments can sometimes reduce taxable profits. However, not every expense qualifies, and tax planning should support genuine business needs. Our Corporation Tax services help UK limited companies identify legitimate savings while remaining fully compliant with HMRC.
When you start trading through a UK limited company, you generally need to tell HMRC that your company is active for Corporation Tax within three months. You can usually do this through HMRC’s online services, using your company’s registration details and Unique Taxpayer Reference (UTR). You’ll also need to maintain accounting records and submit Corporation Tax returns when required. We can handle your Corporation Tax registration, calculations and filings, helping you meet deadlines from the beginning.
You can check your company’s Corporation Tax information through your HMRC online business tax account. Once signed in, you can view available payment information, outstanding balances and relevant tax details. You’ll normally need your Government Gateway sign-in details and access to your company’s Corporation Tax account. Keeping your records updated helps ensure the figures are accurate. We provide ongoing Corporation Tax support, helping limited company directors understand their liabilities, monitor payments and stay on top of important deadlines.
Corporation Tax is paid directly to HM Revenue & Customs (HMRC), not Companies House. Most UK limited companies must pay their Corporation Tax electronically, usually within nine months and one day after the end of their accounting period. Different payment rules apply to certain larger companies. You’ll need the correct payment reference so HMRC can allocate your payment properly. We help limited company directors calculate their Corporation Tax, understand payment deadlines and avoid unnecessary interest or penalties.
