Corporation
Tax.
Accurate returns built on a tax position actively managed throughout the year. Compliance that creates opportunity.
Corporation tax returns done right.
Every UK limited company must file a CT600 return with HMRC. This isn't just a form — it's a detailed computation of your taxable profits, reliefs, and allowances. Getting it wrong means overpaying tax or risking penalties.
Runway prepares and files your CT600 as part of your annual compliance package, ensuring every relief is claimed and every figure is accurate. We work from accounts we already maintain, so there's no last-minute scramble for information.
The real value comes from decisions made before year end — not after. By reviewing your position throughout the year, we can time purchases, dividends, and pension contributions to minimise your liability before the return is even drafted.
Returns that maximize relief.
Capital Allowances
AIA & full expensing claims
R&D Tax Relief
SME & RDEC claims
Marginal Relief
Rate calculations
Loss Relief
Carry back & forward
Associated Companies
Rate band adjustments
Director Loans
s455 & bed & breakfasting
We've been with Runway for several years now and they've been a superb partner to our business. Always on hand and helpful — it genuinely feels like they care about our business and how to maximise its potential.
Vehicle Smart
App & Technology Business
Five-star service.
Every client.
Corporation tax isn't just about filing a return — it's about proactive advice that saves you money throughout the year. Every Runway client works directly with a qualified co-founder who understands your business inside and out.
6+
Years
100+
Clients
5★
Rating
Frequently asked questions
For most small companies, corporation tax is due nine months and one day after your accounting period ends. The return itself must be filed within 12 months.
Marginal relief applies where profits fall between £50,000 and £250,000, providing a gradual increase in tax rate rather than an abrupt jump.
Yes — through claiming all available reliefs and allowances, timing capital investments, and strategic planning throughout the year.
Ready to take the
next step?
Book a free 30-minute call with a Runway co-founder. No pitch, just practical advice.