Corp Tax Calculator answers

Every answer below is aimed at a question people measurably search for, is written from named sources, and links to the page that handles the job itself. None of them is a landing page in disguise.

• Corporation tax calculator

  Work out what a UK limited company owes at the published rates, with marginal relief and associated companies handled, and see the arithmetic.

• Calculate corporation tax: the corporation tax calculation, step by step

  The order the corporation tax calculation actually runs in, from accounting profit to tax due, with the reliefs applied at the point they belong.

• Corporation tax marginal relief, and what it is worth

  What Marginal Relief does between the £50,000 and £250,000 thresholds, who cannot claim it, and why associated companies decide whether you get it at all.

• Associated companies for corporation tax, and how they divide the thresholds

  How associated companies cut the £50,000 and £250,000 thresholds, what counts as associated, and why the count drives a small company's rate.

• Corporation tax payment details

  What you need to pay corporation tax to HMRC: the reference that changes every year, the ways to pay and how long each one takes to arrive.

• When do you pay corporation tax, and the corporation tax payment deadline uk companies work to

  The nine months and one day rule, when it stops applying, and why the payment deadline falls three months before the filing deadline.

• Quarterly corporation tax payments and corporation tax payments on account

  Who has to pay corporation tax quarterly, when the four instalments fall, and why the threshold is lower than it looks for a group.

• Can you pay corporation tax in installments

  The two completely different things this question can mean, and which one applies to a company that simply cannot pay by the deadline.

• Corporation tax time to pay

  How a Time to Pay arrangement for corporation tax is agreed, what HMRC asks for, and what the arrangement does and does not stop.

• Corporation tax for small businesses

  What a small UK limited company actually pays, the three thresholds that decide it, and the reliefs that are worth the paperwork at that size.

• Directors loan account: what it records and what it costs

  What a director's loan account is, when it becomes a corporation tax charge on the company, and the two dates that decide whether anything is payable.

• What is a directors loan, and what is a directors loan account

  A plain definition of a director's loan, how it differs from salary and dividends, and the point at which it starts costing the company money.

• Directors loans, and the director's loan rules a company follows

  The reporting, the tax charge, the benefit in kind and the company law approval a director's loan can trigger, and which apply to your balance.

• How does a directors loan work, start to finish

  The full sequence of a director's loan: taking it, recording it, reporting it at the year end, and the two deadlines that decide whether it costs anything.

• Overdrawn directors loan account: the tax on overdrawn directors loan account balances

  What an overdrawn director's loan account costs, the nine-month deadline, and the four ways companies clear one before the charge falls due.

• S455 tax: the s455 charge and the s455 tax rate

  What section 455 charges, who pays it, the rate, and why it is a deposit with the Revenue rather than a permanent tax on the company.

• S455 reclaim: how to reclaim s455 tax once the loan is repaid

  How and when a company reclaims section 455 tax after a loan is repaid, the statutory waiting period, and the form the claim goes on.

• Directors loan interest rate: the directors loan account interest rate and interest on directors loan to company

  Which rate applies to a director's loan, why charging HMRC's official rate removes a benefit in kind, and the position when the loan runs the other way.

• Write off directors loan account: what it costs on both sides

  What writing off a director's loan costs: distribution treatment on the director, the national insurance, and why the company gets no deduction.

• Directors loan account in credit: what the company owes you

  What it means when the company owes the director, why no corporation tax charge arises, and how to draw the balance back out tax-free.

• Directors loan tax avoidance: the rules that close the obvious routes

  The thirty-day rule and the arrangements rule, explained as published anti-avoidance law rather than as a strategy, and what they catch.

• What is a close company: the close company uk test, and what it costs close companies

  The close company test, why nearly every owner-managed UK company meets it, and the three tax charges that follow from being one.

• Capital allowances: how tax capital allowances cut a company's bill

  What capital allowances are, which allowance applies to which spend, and how the claim changes the taxable profit a corporation tax rate is applied to.

• What are capital allowances, and what is capital allowance UK relief worth?

  A plain answer: what capital allowances are, what they replace, who can claim them and roughly what a claim is worth to a company.

• Capital allowance meaning, in the words the legislation uses

  What the term capital allowance actually means, where it comes from, and the three words inside it that carry the whole definition.

• Claim capital allowances: claiming capital allowances in a way that stands up

  Where a capital allowances claim is made, the time limits that apply, and the records that decide whether it survives an HMRC enquiry.

• How to calculate capital allowances: calculating capital allowances, with a capital allowances example

  The order a capital allowances computation runs in, pool by pool, with a worked example showing where the deduction ends up.

• Capital allowance rates: the capital allowance rate for each pool

  Every capital allowance rate in current use, which pool it belongs to, and the change to the main rate that took effect in April 2026.

• How do capital allowances work, from invoice to tax saved

  The path a piece of capital spending takes from purchase to tax relief, and the two decisions along it that change what the company saves.

• Capital allowances plant and machinery: what actually qualifies

  What counts as plant and machinery for capital allowances, the function test the courts apply, and the items that surprise companies either way.

• Full expensing capital allowances: 100%, no cap, companies only

  What full expensing gives, who can use it, what it excludes, and the disposal charge that makes it different from the annual investment allowance.

• Integral features capital allowances, and capital allowances on integral features

  The five categories of integral feature, why they sit in the special rate pool, and how a building's fixtures get identified and valued.

• Capital allowances on commercial property: what a building holds

  What proportion of a commercial property purchase or fit-out typically qualifies, how the claim is established, and the traps on a second-hand building.

• Property capital allowances: capital allowances on property and capital allowances on buildings

  How capital allowances work where property is involved, what the fabric of a building gets instead, and where structures and buildings allowances fit.

• Capital allowances on solar panels, and solar panel capital allowances in practice

  Which pool solar panels fall into, what allowances a company can use on them, and how the treatment interacts with a commercial roof.

• Capital allowances on electric cars, and car capital allowances generally

  The three rates that can apply to a company car, why electric vehicles are treated differently, and what the emissions thresholds decide.

• Capital allowances specialist: what one does and what it costs

  What a capital allowances specialist produces, when the work is worth buying, and what the firms in this record publish about their fees.

• Corporate tax advisors, and what a corporate tax advisor actually costs

  What corporate tax advisors do that an accountant does not, how the market prices the work, and what the firms in this record publish.

• Corporate tax accountants: what to ask a corporate tax accountant

  What corporate tax accountants handle for a limited company, what changes their fee, and the questions that make quotes comparable.

• Corporate tax services: what sits inside the heading

  The three tiers corporate tax services are sold in, what each covers, and which of them a small company actually needs.

• Corporate tax advice, and when it earns the fee

  Which corporate tax questions have published answers, which turn on a company's own facts, and how to tell the difference before paying.

• Corporate tax accounting: the computation, the accounts and the gap

  How the tax computation relates to the statutory accounts, why the two figures never match, and what deferred tax is doing in between.

• Company tax returns, and what is a company tax return made of

  What a company tax return contains, what has to be filed with it, the deadline, and how it differs from the accounts filed at Companies House.

• Corporate tax return: preparing corporate tax returns without surprises

  The order a corporate tax return is prepared in, the figures that have to agree with the accounts, and where amendments are made.

• Corporate tax filing, and corporation tax compliance in practice

  How a company files its corporation tax return, the electronic format HMRC requires, and what an ongoing compliance cycle actually involves.

• Tax returns for limited company owners, and the ltd tax return itself

  The returns a limited company and its director each have to file, which is which, and why owners routinely confuse the two.

• Tax returns for companies, and the tax return for corporation tax specifically

  Which companies have to file, what happens to dormant and non-trading companies, and how the obligation starts and ends.

• Corporate tax software: what it has to do and who needs it

  What corporate tax software must produce for HMRC, when HMRC's own free service is enough, and what a company gives up by filing itself.

• Free ct600 filing software, and when free is genuinely enough

  What free options exist for filing a CT600, the eligibility boundary on HMRC's own service, and where free stops being viable.

• R&D tax credits software: what a portal does and what it costs

  What R&D tax credits software actually replaces, where a portal is cheaper than a specialist, and the one published price in this market.

• Accounting for R&D tax credit: where the credit lands in the accounts

  How an R&D claim is recognised in a company's accounts, why the merged scheme credit is above the line, and when to recognise it.

• R&D claim notification form: who must file one and by when

  Who has to submit a claim notification form before an R&D claim, the six-month window, and what happens to a claim that misses it.

• R&D qualifying expenditure: what counts as qualifying R&D expenditure, including subcontracted R&D

  The cost categories an R&D claim can include, the ones companies wrongly assume qualify, and how subcontracted work is treated.

• R&D costs: which ones a claim can actually include

  How to take a project's real cost base and identify the part an R&D claim can carry, and the apportionment that decides most of it.

• R&D intensive smes: what the intensity condition is worth

  What makes an SME R&D intensive, the higher payable credit that follows, and why the test is about total expenditure rather than turnover.

• R&D tax incentives: what the UK actually offers a company

  The R&D incentives a UK company can use, how they have consolidated, and where patent box and capital allowances fit alongside them.

• R&D claim example: a claim from timesheet to tax return

  A worked R&D claim for a small development company, showing the apportionment, the qualifying window and what actually reaches the return.

• Patent box tax relief: the patent box scheme and the uk patent box rate

  What the patent box does to a company's rate on patented profits, who can elect into it, and why the computation is the hard part.

• Late payment of corporation tax, and the corporation tax late payment interest it costs

  What happens when corporation tax is paid late: the interest, when it starts, how it differs from a penalty, and what to do about it.

• Corporation tax late payment penalties, and the penalty for late payment of corporation tax

  Whether corporation tax carries late payment penalties at all, what does get penalised, and where the confusion with self assessment comes from.

• Corporation tax late filing penalties: what a late return costs

  The fixed penalty scale for filing a company tax return late, when it escalates, and the appeal position where there is a reasonable excuse.

• Corporation tax activation code: the activation code for corporation tax online

  What the corporation tax activation code is, how long it takes to arrive, what to do if it expires, and how to file while waiting.

• How to reduce corporation tax: the reliefs that actually do it

  The reliefs that genuinely reduce a UK company's corporation tax, ranked by how much they typically move the number, and the ones that do not.

• Ways to reduce corporation tax, and how to pay less corporation tax without a scheme

  The timing and structural decisions that change a company's corporation tax, as distinct from the reliefs, and where each one bites.

• Group relief corporation tax rules, and when a loss can be surrendered

  How group relief moves a loss from one company to another, the 75% test, and the claims and time limits that govern it.

• Electric car business tax: the electric car corporation tax relief and what else it triggers

  What a company gets and pays when it buys an electric car: the capital allowance, the running costs, and the charge on the driver.