SimpleCompanyTax turns your prepared figures into supported Corporation Tax returns and accounts. Pick a task or explore a topic to find the scope and filing steps you need.
Last updated:
Enter them yourself or upload financial reports.
HMRC Companies House
Open a topic to see its features, supported scenarios and guides.
Upload financial reports, review the mapping and keep control of the figures used in your filing. Imports are for the supported company financial-data route, not the charity or club routes.
SimpleCompanyTax imports current-period figures and prior-year comparatives from prepared trial balance, profit and loss or balance sheet reports. Review the period, mapped lines and figures before applying them.
SimpleCompanyTax recognises supported Xero, QuickBooks Online and Sage Accounting financial-report exports. You upload exported files. No sign-in to your accounting software is needed.
Filing terms: Xero · QuickBooks Online · Sage Accounting
SimpleCompanyTax accepts tabular financial reports from your spreadsheet or other software, up to 1 MB and 2,000 rows.
Filing terms: CSV · Excel · XLSX · XLS
SimpleCompanyTax suggests account mappings that you can change, assign, undo or restore before applying the import.
SimpleCompanyTax shows imported amounts that need your allocation on a long period and links to the existing allocation controls.
Use your prepared accounts and the Corporation Tax dates you enter. Supported long periods produce two returns, with customer-entered allocations where needed.
SimpleCompanyTax prepares two dated CT600 returns from one set of figures for a supported accounts period longer than 12 months.
Filing terms: CT600 · period of account
SimpleCompanyTax supports a separate Corporation Tax period in any accounts year for ordinary filings through the HMRC-only route.
Filing terms: CT600 boxes 30 and 35
SimpleCompanyTax supports entered coverage beyond the accounts end through HMRC-only filing with separate figures for the extra days.
SimpleCompanyTax files the outstanding short-period CT600 when the first return was already filed with the full accounts, without attaching the accounts again.
Filing terms: short period · stub return
SimpleCompanyTax supports an HMRC-only filing that amends the first return and files the outstanding second return with the full accounts. The supported charity CT600E route also offers this choice.
SimpleCompanyTax uses your entered dates and figures for the first filing, including a later trading start.
SimpleCompanyTax supports overdue returns for periods starting on or after 1 April 2015 within the service scope.
Correct a return filed here or elsewhere, and choose the filing destination you need. Review the revised documents before submitting.
SimpleCompanyTax prepares an amended CT600 from your corrected figures and amendment reason.
SimpleCompanyTax supports revised accounts with the revised-accounts statement and original approval date retained.
SimpleCompanyTax includes your estimate explanation when you declare estimated figures.
Filing terms: CT600 box 55
Eligible ordinary companies can file generated accounts directly. CICs use a downloadable upload package. Charity and club routes have separate supplied-accounts boundaries.
SimpleCompanyTax generates FRS 105 iXBRL accounts and a tax computation from your prepared figures for eligible micro-entity companies.
Filing terms: FRS 105 · iXBRL
SimpleCompanyTax supports the dormant filing route when it matches your company’s prepared position.
SimpleCompanyTax lets eligible company filers choose the filing targets and shows the outcome for each authority.
SimpleCompanyTax keeps the Companies House profit and loss copy private by default and lets eligible filers choose to publish it.
SimpleCompanyTax makes the prepared iXBRL documents available to download for your records.
Filing terms: iXBRL
SimpleCompanyTax prepares the supported CIC accounts and CIC34 ZIP package for you to upload to Companies House, alongside HMRC CT600 filing.
Filing terms: CIC34
SimpleCompanyTax uses the code you enter for eligible direct accounts filing and explains a rejected code in the filing outcome.
Enter your prepared figures and treatment choices. The linked guides explain material conditions and the exact fields, including both returns for a long period.
SimpleCompanyTax calculates the supported Corporation Tax rates and marginal relief using your entered associated-company information.
Filing terms: CT600 boxes 326, 327 and 328
SimpleCompanyTax supports the available brought-forward trading-loss claims, including a maximum, partial or nil claim where the control applies.
Filing terms: CT600 box 285
SimpleCompanyTax records a prepared carry-back repayment in your accounts. Carry-back and terminal loss claims are made separately with HMRC.
SimpleCompanyTax keeps non-trading deficits separate and supports the available brought-forward claim against total profits.
Filing terms: CT600 box 263
SimpleCompanyTax supports entered gains and capital-loss balances through the tax calculation and computation.
SimpleCompanyTax supports property-only and mixed trading/property figures, with property losses kept in their own pool.
Filing terms: UK property business
SimpleCompanyTax supports qualifying donation deductions, including property companies and your allocation between long-period returns.
Filing terms: CT600 box 305
SimpleCompanyTax supports the available per-type capital allowance inputs and customer-entered allocations on long periods.
Filing terms: AIA · capital allowances
SimpleCompanyTax supports the Structures and Buildings Allowance amount you enter within the supported claim scope.
SimpleCompanyTax supports the available car allowance inputs with the pool treatment you choose.
SimpleCompanyTax supports the available disposal and cessation adjustments without reclassifying an unsupported claim.
SimpleCompanyTax supports the entered intangible adjustments through the accounts and tax computation.
SimpleCompanyTax supports the available intangible realisation fields and box 640 disclosure.
Filing terms: CT600 box 640
SimpleCompanyTax supports the available management-expense deduction and carry-forward inputs, including long periods.
Filing terms: CT600 boxes 245 and 850
SimpleCompanyTax supports entered non-trading exchange amounts and the relevant CT600 disclosure.
Filing terms: CT600 box 795
SimpleCompanyTax supports the available pre-trading expense input with customer allocation for a long period.
SimpleCompanyTax supports entered grants and other income through the available classification fields.
Filing terms: CT600 box 205
SimpleCompanyTax asks which treatment applies to entered interest when that choice is needed for the calculation.
SimpleCompanyTax accepts decimal money inputs and rounds the return figures using the existing filing rules.
SimpleCompanyTax supports entered tax already paid against the period liability, including partial amounts.
Filing terms: CT600 box 595
SimpleCompanyTax supports the available expense add-backs and prepared bad-debt adjustments.
Scope depends on the organisation and treatment. A supported form or box does not mean every possible relief or accounts standard is supported.
SimpleCompanyTax supports unpaid loans to participators and relief for repayments within nine months through CT600A Parts 1 and 2. Later repayments, releases and write-offs are not supported.
Filing terms: CT600A · section 455
SimpleCompanyTax supports the available loan-waiver and statutory exception choices, including the corporate rescue path.
SimpleCompanyTax files CT600 and CT600E for the supported charitable and CASC routes using your exemption choices and supplied accounts where required.
Filing terms: CT600E
SimpleCompanyTax supports the available box 4 type codes, including code 7 for qualifying active management-company filings.
Filing terms: CT600 box 4
SimpleCompanyTax lets you answer the box 75 exemption question separately for each return on a long period.
Filing terms: CT600 box 75
Use the route that matches your prepared position. Dormancy, ceasing to trade and closing the company are different questions.
SimpleCompanyTax offers an annual dormant plan covering supported dormant accounts and CT600 filings.
SimpleCompanyTax supports final-period figures, the trade-stopped declaration and available balancing-allowance inputs. Terminal loss and carry-back claims are made separately with HMRC.
Manage a pool of companies and your team through annual Practice plans. Check the current company allowance and VAT basis on the pricing page.
SimpleCompanyTax offers annual Practice plans with company allowances and quantity selection at checkout.
SimpleCompanyTax supports unlimited Practice team members, invitations and supported company moves between workspaces.
Review the documents before approving and submitting. Keep the accounts, return and receipts together and check each authority’s final outcome.
SimpleCompanyTax shows watermarked draft PDFs before you pay so you can check the prepared filing.
SimpleCompanyTax provides the supported filing-document PDFs for review and your records.
SimpleCompanyTax shows submission status and the eventual authority outcome for each selected filing target.
SimpleCompanyTax keeps saved filing inputs so you can resume a supported draft or amendment.
This is selected coverage linked to supported customer inputs, not a claim to support every box or treatment. The guides state the conditions and show what to check in your return.
| Form and boxes | Supported feature and scope |
|---|---|
| CT600: 30, 35 | Corporation Tax dates different from your accounts Customer-entered Corporation Tax dates. Separate accounts dates are retained. |
| CT600: 55 | Declare estimated figures on the CT600 Customer declaration and explanation, including applicable long-period returns. |
| CT600: 326, 327, 328 | Marginal relief and associated companies Supported tax-rate and associated-company inputs, not consolidated accounts or group relief. |
| CT600: 285 | Trading losses brought forward and claim choices Supported brought-forward total-profits claim, subject to the linked conditions. |
| CT600: 263 | Non-trading loan relationship deficits Supported brought-forward non-trading deficit claim, not every possible loan relationship treatment. |
| CT600: 305 | Qualifying charitable donations Qualifying donation deduction under the linked conditions. Unused relief is not automatically carried forward. |
| CT600: 640 | Report an intangible asset sale on the CT600 Supported intangible realisation disclosure, not every possible intangible regime. |
| CT600: 245, 850 | Investment company management expenses Supported management-expense deduction and arising-amount disclosure. |
| CT600: 795 | Non-trading foreign exchange gains and losses Non-trading loan relationship deficit arising, including non-trading exchange losses. Box 795 is not an exchange-only box. |
| CT600: 205 | Revenue grants and other company income Income not falling under another heading. Other supported grant classifications use their own fields. |
| CT600: 595 | Corporation Tax already paid, including partial payment Customer-entered Corporation Tax already paid for the applicable return. |
| CT600A | CT600A loans to participators CT600A Parts 1 and 2: unpaid loans and repayments within nine months. Later repayments, releases and write-offs are not supported. |
| CT600E | CT600E for supported charities and CASCs Supported exemption disclosures. Charity and club accounts are supplied, not generated. |
| CT600: 4 | CT600 company type, including management companies Supported active company-type choices. The dormant journey does not offer code 7. |
| CT600: 75 | CT600 box 75 SME transfer pricing exemption Customer answer to the supported transfer pricing exemption question. |
Generated company accounts use FRS 105. FRS 102, consolidated accounts, group relief, audit-required accounts and unsupported supplementary pages are outside the service. Charity and club routes use supplied accounts or an available omission option. CIC Companies House filing uses a package that you upload.