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Corporation Tax Services

Pay Only What You Owe. Not a Penny More.

Corporation tax is not optional - but how much you pay very much is.
Every UK limited company must file a corporation tax return and pay what it owes. But within the rules, there is often significant room to reduce your tax bill - through reliefs, allowances, loss carry-forwards, and legitimate planning. Most businesses leave money on the table because they do not have an accountant actively looking for these opportunities.
At Oasis Accountants, we do. We prepare and file your CT600, yes - but more importantly, we review your finances throughout the year to spot every legal opportunity to lower your tax liability.

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Corporation tax clients across London have collectively saved significant sums through proactive planning with Oasis.

What We Manage

Corporation tax return preparation and CT600 submission to HMRC
Accurate calculation of your tax liability - including all allowable deductions
Identification of tax reliefs, capital allowances, and loss offsets
Capital Gains Tax reporting on asset sales
Full handling of any HMRC letters, notices, or enquiries
Year-round compliance monitoring - not just at filing time
Review of your existing tax structure for efficiency

Common Ways We Reduce Your Tax Bill

Claiming capital allowances on equipment and vehicles
Utilising annual investment allowances to their full limit
Carrying back or forward trading losses where permitted
Structuring directors' pay and dividends tax-efficiently
Claiming R&D tax credits if your business innovates (see our R&D page)

How It Works

Step 1

Year-end review

We review your accounts and identify every relief and allowance you are entitled to.
Step 2

CT600 preparation

We calculate your liability accurately and prepare your return.
Step 3

Filing & payment

We submit to HMRC on time and advise on the most efficient way to pay.
Step 4

Ongoing planning

We flag opportunities throughout the year — not just when the deadline arrives.

FAQ

When is my corporation tax due?

Your CT600 must be filed within 12 months of your company's accounting period end. Payment is due 9 months after the accounting period ends. We track these deadlines for you.

What happens if I file late?

HMRC will issue penalties — starting at £100 for the first day and increasing over time. Interest also accrues on late payments. We make sure this never happens.

Can I reduce my corporation tax bill?

In most cases, yes — legally. Capital allowances, R&D credits, loss reliefs, and smart dividend structuring are all common ways. We look for these opportunities for every client.