Company Tax Return CT600 Version 3 Use For Accounting Periods Starting On Or After 1 April

Use a Company Tax Return CT600 Version 3 Use For Accounting Periods Starting On Or After 1 April 2020 template to make your document workflow more streamlined.

What the CT600 form is used for

The Company Tax Return CT600 Version 3 is a United Kingdom company tax return, not a U.S. IRS form. It reports a company’s taxable profits and corporation tax position for the accounting period beginning on or after 1 April, using the version named in the document title. A U.S. business should not assume that ESIGN, UETA, or signNow makes this form a U.S. tax filing. signNow can help prepare, route, sign, and retain a CT600 PDF, while the company remains responsible for the applicable UK filing rules, figures, and submission method.

Who benefits from a controlled CT600 workflow

The CT600 workflow is most useful when multiple reviewers, directors, or finance systems must coordinate one company’s return.

A U.S. financial-services team coordinating a UK subsidiary’s CT600 can route the prepared PDF to authorized directors and retain approval evidence centrally.
A multinational enterprise can connect CT600 approvals with NetSuite or Microsoft 365, keeping the signed return alongside accounting records and supporting schedules.
A tax adviser handling several UK company returns can reuse a controlled signNow template while reviewing each accounting period, company identifier, and tax computation separately.

How to process a CT600 online

Use signNow to organize the CT600 document without treating the signing workflow as tax advice or official filing.

Upload: Upload the CT600 PDF
Prepare: Add company and signer fields
Route: Send the return for approval
Retain: Store the completed record

Complete a CT600 signing workflow

Prepare the exact CT600 version first, then use signNow to route signatures and preserve the completed document record.

Upload:
Upload the CT600 PDF.
Add fields:
Auto-detect or place fields.
Send:
Send it to authorized signers.
Store:
Download the signed return and audit trail.

Setting	Recommendation
Authentication method	Email verification with stronger controls where required
Signature type	Typed or drawn electronic signature
Audit trail	Enable completion history and export
Document retention	Follow the governing UK tax policy
Encryption	Use TLS and AES-256 protection

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Authenticate signer:

Record the signer’s authentication event.

Timestamp activity:

Capture signing time and action.

Hash document:

Associate the document with its completion record.

Seal evidence:

Preserve changes through the audit record.

Retrieve trail:

Export the completed CT600 evidence.

Archive record:

Store the PDF and audit trail together.

Connect CT600 workflows to business systems

Connect signed CT600 records with the systems that hold company data, approvals, and supporting tax documentation.

Find and fill out the correct company tax return ct600 2020 version 3 use for accounting periods starting on or after 1 april 2015

airSlate SignNow helps you fill in and sign documents in minutes, error-free. Choose the correct version of the editable PDF form from the list and get started filling it out.

Versions	Form popularity	Fillable & printable
UK CT600 2024	4.8 Satisfied (43 Votes)
UK CT600 2023	4.8 Satisfied (1574 Votes)
UK CT600 2020	4.8 Satisfied (3604 Votes)
UK CT600 2018	4.8 Satisfied (2825 Votes)
UK CT600 2015	4.8 Satisfied (9332 Votes)
UK CT600 2008	4.7 Satisfied (611 Votes)

Protect CT600 records during signing

Data encryption:

Encrypted in transit and storage

SOC 2 Type II:

Independent control report available

ISO 27001:

Certified information security controls

ESIGN and UETA:

Electronic signature compliance

AES-256 protection:

Strong protected-data safeguards

TLS protection:

Secure transport protocols

Retention periods for CT600 records

Retention depends on the governing UK tax requirement and the record’s purpose. Do not import a U.S. period without confirming applicability.

3 years from filing

Apply the retention policy required for the company’s applicable UK tax records; verify the period with HMRC guidance.

6 years for HIPAA records

Use 6 years only when the record is a HIPAA-covered record under 45 CFR §164.530(j), not merely because it is a CT600.

Accounting records period

Keep company accounting evidence according to the applicable tax rule and accounting policy; no CT600-specific period is supplied here.

Completed return period

Retain the signed PDF and audit trail for the period required by the company’s governing tax and records policy.

Statutory hold duration

Preserve records longer when litigation, an investigation, or a statutory hold applies.

Best practices for CT600 recordkeeping

A controlled CT600 process protects the submitted version, signing evidence, supporting schedules, and retention decisions from avoidable disputes.

Reconcile every CT600 figure before signing

Before sending, compare the company name, accounting period, taxable-profit figures, tax computation, and attached schedules against the approved working papers. Treat the CT600 PDF as a controlled version so later edits do not silently replace the signed return.

Export the audit trail with the return

Export the completed CT600 and signNow audit trail together after all required signatures are complete. Record the export date, document version, signers, and intended filing destination in the company’s records index.

Apply the correct retention authority

Use a retention schedule approved for the company’s applicable UK tax records. Do not apply the HIPAA six-year rule unless the record genuinely contains HIPAA-covered information governed by 45 CFR §164.530(j).

Archive the signed CT600 securely

Restrict access to finance, tax, and authorized company officers. Store the signed CT600 and supporting schedules in encrypted storage, and preserve the original PDF rather than only a printed copy.

Avoid CT600 preparation mistakes

Mixing UK CT600 requirements with U.S. IRS return rules can produce the wrong filing assumptions, authority references, and submission process.
A scanned CT600 may lack usable fields, requiring manual placement of signature, date, and approval fields before routing.
A signed PDF and its audit trail show signing activity but do not establish that the return was accepted by the relevant tax authority.
Changing company figures after signature can create a mismatch between the executed CT600 and the version intended for submission.

Risks when CT600 records are mishandled

UK-U.S. mismatch

Wrong filing authority

Missing figures

Incomplete tax data

No acceptance evidence

Unproven submission

Record discrepancy

Changed signed copy

Resolve CT600 signing and filing issues

Use these answers to separate signNow workflow problems from the company’s underlying CT600 filing obligations.

Upload the completed CT600 PDF again and confirm that the file is not password-protected. signNow can place fields after upload, but a locked source file may prevent field detection or editing.

Use signNow’s field editor to add signature, date, and initials fields manually. Review every company reference and tax-period value before sending, because signNow does not determine whether CT600 entries are tax-accurate.

Business includes templates and audit trails at $8/user/month with annual billing. Business Premium costs $15/user/month and adds bulk send; select the plan based on repeated CT600 workflows.

For consumer-facing records, ESIGN requires consent to electronic records and access to the electronic format under 15 U.S.C. §7001(c). Keep the disclosure and signed record with the CT600 audit trail.

signNow’s Business plan provides audit trails, while Enterprise adds advanced signer authentication. Configure authentication according to the company’s identity-control policy and preserve the completion record with the submitted CT600.

A completed signNow record supports evidence of intent, attribution, and record reproduction. ESIGN and applicable state law, including UETA or New York ESRA, govern electronic-signature treatment; they do not replace any tax-filing requirement.

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