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Corporation tax (CT600)

Taxable Profit Calculation (Corporation Tax)

A taxable profit calculation turns your company accounts into the figures HMRC actually taxes. We calculate your corporation tax taxable profit by applying the right adjustments and reliefs, so you know your true corporation tax position and can file and pay with confidence.

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What this service covers

We calculate your company’s taxable profit for corporation tax purposes and provide a clear working paper you can rely on for compliance and planning. This typically includes:

  • Reconciling accounting profit to taxable profit
  • Reviewing income recognition and cut-off where it affects tax
  • Identifying disallowable expenditure and adding it back (for example, certain entertaining and penalties)
  • Considering allowable business expenses and ensuring they are treated correctly
  • Calculating capital allowances and replacing depreciation with tax relief where relevant
  • Bringing in prior year losses and other reliefs where available
  • Flagging areas that may need clarification before filing (for example, mixed-use costs)
  • Producing a taxable profit schedule that supports the corporation tax computation

When this is most useful

This service is a good fit if you run a limited company and want certainty before you file your CT600 and accounts. It is especially helpful if you have:

  • One-off purchases, equipment, or vehicles where capital allowances may apply
  • Business expenses that could be partly personal
  • Entertainment, travel, or subsistence costs you want treated correctly
  • A year with changing income levels, multiple revenue streams, or timing issues
  • Losses to carry forward or other reliefs you want applied correctly

How the calculation is delivered

We start with your draft or final accounts and supporting bookkeeping reports, then work through the tax adjustments to arrive at taxable profit. Where something is unclear, we come back with specific questions so the position is agreed and documented.

You receive a concise taxable profit reconciliation showing what changed from accounting profit and why, written in plain English. This helps you understand the result, not just accept a number.

What happens after the calculation

Once taxable profit is confirmed, you can use it to finalise your corporation tax computation and CT600 filing, and to plan the payment due date. If the figures highlight opportunities or risks, we can outline practical next steps, such as tightening expense categories, improving records for claims, or forecasting future liabilities.

Frequently Asked Questions

What is the difference between accounting profit and taxable profit?
Accounting profit is what your accounts show after applying accounting rules. Taxable profit adjusts that figure under HMRC rules, for example by adding back disallowable costs and claiming capital allowances.
What do you need from me to calculate taxable profit?
We typically need your draft accounts or trial balance, bookkeeping reports, and details of any significant purchases or unusual costs. If there are grey areas, we will ask targeted questions so the treatment is clear and consistent.
Do capital allowances affect taxable profit?
Yes. Depreciation in the accounts is not tax deductible, so it is removed and replaced with capital allowances where eligible. This can materially change taxable profit, especially after buying equipment or other fixed assets.
Can you include director expenses and benefits correctly?
Yes. We review common areas like travel, subsistence, home working, and mixed-use costs to check what is allowable. If a benefit-in-kind may apply, we flag it so it is handled correctly.
When should I get the taxable profit calculation done?
Ideally before finalising your CT600, so any questions are resolved and your corporation tax is accurate. Many companies do this soon after the year end, leaving time to plan the payment and avoid surprises.

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