Efficient corporation tax return filing (including nil returns). ACG ensures compliance.

Desktop setup showing corporation tax return form and financial tools for accurate HMRC filing

Filing a Corporation Tax Return (CT600) is a legal requirement for every UK-based limited company—or any entity issued a return by HMRC. At Audit Consulting Group, we offer complete, end-to-end solutions for preparing, reviewing, and submitting your corporation tax return online. We combine speed, accuracy, and UK tax expertise to help minimise liabilities, avoid penalties, and maximise refunds.

Whether you’re a first-time filer, a growing SME, or need amendments to previous filings, our team ensures your corporation tax return is completed correctly, filed on time, and optimised tax-wise.

Why Corporation Tax Returns Matter

• Mandatory Compliance – If HMRC issues a notice to deliver a corporation tax return form, you must comply—even in loss-making years.
• Deadlines Are Strict – You usually must file within 12 months of your accounting period end. Filing corporation tax returns late brings penalties.
• Tax Must Be Paid Promptly – Corporate tax return payments must be made within 9 months + 1 day after the accounting year ends.
• Maximising Efficiency – Correct corp tax return submissions can unlock refunds, credits, or planning opportunities.
• Risk of HMRC Action – They can audit or impose penalties if corporation tax return filing is incorrect or delayed.

What We Provide: Full-Service CT600 Support

1. Comprehensive CT600 Preparation & Filing
   We prepare and submit corporation tax return forms electronically via HMRC’s secure system—accurately and on time.
2. Online Submission and Real-Time Confirmation
   We use HMRC’s corporation tax return online portal for instant receipt confirmation and live refund tracking.
3. Tax Estimate & Payment Support
   Get an early look at liabilities with corporation tax return cost estimates and advice on refunds, overpayments, and accounting.
4. Amendments, Extensions & Late Filings
   We manage amendments to prior corp tax return form years and support time-to-pay arrangements or late submission reliefs.
5. Exemption & Relief Advice
   We help claim eligible exemptions, such as UK small profits rate, R&D reliefs, or group/consortium reliefs.
6. Transparent Pricing & Packages
   Choose from standalone file my corporation tax return support, bundled packages (annual accounts + tax), or full compliance options.
7. Refund Management & Helpline
   Expecting a refund? We follow up with HMRC, track the tax return for corporation status, and ensure proper posting.
8. Deadline Tracking & Alerts
   We monitor CT600 deadlines, payment dates, and period changes so you never miss submitting corporation tax return forms.
9. Support for All Entity Types
   Whether you’re a small Ltd, a large corporate, or overseas C-Corp, we handle all your corp tax return needs.
10. Guidance on CT600 vs CT600A
    If exempt (e.g., dormant or associations), we ensure the right form is submitted or exemption applied properly.

Real-Life Client Success Stories

Explaining corporation tax compliance and reporting strategies during a team briefing

Case 1: First-Time Company, First-Time CT600
A newly formed Ltd in Manchester contacted us to file their first corporation tax return. We completed the CT600 in 3 days, reconciled accounts, and submitted on time—no first-year penalties.

Case 2: SME Needing Amendment & Refund
A creative agency missed R&D relief in earlier filings. We amended the corp tax return, claimed £15,000 back, and avoided future penalties.

Case 3: Late-Filing Support Under Pressure
A tech firm missed its CT600 deadline. We prepared and submitted a late corporation tax return form, and HMRC accepted our justification, waiving penalties.

How Our CT600 Process Works

1. Timeline & Deadline Review
   We confirm your accounting period, filing corporation tax return deadlines (via HMRC or CTM930).
2. Data Gathering
   We request statutory accounts and financials for accurate corporation tax return
3. Draft CT600 & Computations
   We compute profits, losses, reliefs, and tax due on the corp tax return form.
4. Client Review & Queries
   You approve or discuss computations before we proceed.
5. Submission & Monitoring
   We submit corporation tax return online, confirm receipt, and track refund progress.
6. Follow-Up & Reporting
   We issue a final report and provide guidance for any future tax return for corporation

Frequently Asked Questions (FAQ)

Do I need to file a Corporation Tax Return even with zero profit?
Yes—if HMRC issues a notice or the company exists, you must file a corporation tax return, even if dormant.

When are CT600 and tax payments due?
You must file your corporation tax return within 12 months after the accounting period. Pay within 9 months + 1 day.

What are the penalties for late filing?
Late corporation tax return filing incurs penalties. Reasonable excuses may be accepted by HMRC.

Can I file myself via software (e.g., Xero/FreeAgent)?
Yes, but incorrect corporation tax return online submissions can lead to missed reliefs or penalties.

How long does it take to process a refund?
Usually a few weeks. We track and follow up your corp tax return refund with HMRC.

What if my accounting period changes?
We’ll notify HMRC and adjust filing corporation tax returns as per CTM930 guidance.

Do you handle C Corp or overseas entities?
Yes—if your UK company is part of a larger group, we ensure full corporate tax return compliance.

Why Partner with Audit Consulting Group

• Fixed-fee clarity – No hidden charges
• Fast turnaround – Same-day or 48-hour corp tax return drafting
• Professional HMRC liaison – Refund tracking and penalty appeals
• Complete service – CT600 + annual accounts, VAT, payroll
• UK-wide coverage – Ltds, Incs, C Corps, associations
• Digital-first delivery – Secure document portal for all tax return for corporation needs

Preparing for CT600: A Quick Checklist

Corporate tax consultants reviewing financial data for HMRC corporation tax return submission

1. Confirm your accounting period and key CT600 deadlines
2. Finalise statutory P&L and balance sheet
3. Gather VAT, R&D, capex, and group relief data
4. Check past losses or eligible reliefs
5. Engage us early for proactive corporation tax return estimates
6. Remind directors of their filing duties
7. File my corporation tax return before the deadline
8. Track refunds
9. Amend or extend if needed

Summary: Maximise Compliance, Minimise Stress

With Audit Consulting Group, your corporation tax return is:

• Correct, compliant, and on time
• Backed by clear estimates and HMRC guidance
• Tracked for refunds or responses
• Supported by top-tier UK tax professionals

Avoid penalties, claim every eligible relief, and submit your corporation tax return confidently.

Book your free consultation today – we’ll assess your tax position and deliver your corp tax return quickly and accurately.