Send annual returns

Send annual returns securely

Send annual returns securely by email using encryption and recipient authentication.

Free for 5 sends per month

Upgrade for unlimited sends

Why protect annual returns?

Annual returns contain sensitive company details, like revenue and shareholder information. A data leak could harm your business or lead to fines. Using secure methods to handle this information helps keep your company safe and compliant.

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Can't I just email an annual return?

Emailing annual returns is risky. These documents contain private company data that could be exploited if intercepted. Use encryption to protect your communications and avoid data breaches.

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How sensitive is the data in an annual return?

Based on our analysis, we’ve given annual returns a sensitivity rating of 70 out of 100.

Data at risk:

Company financials
Shareholder information
Corporate address
Director details

Sensitivity rating - 70

How to send your annual return safely

Send your annual return using Mailock to apply encryption and recipient authentication.

Step 1. Create a free account

Create your free Mailock account with some basic details.

Step 1. Create a free Mailock account

Step 2. Drag and drop your files

Drag and drop your files onto a new message, enter your recipients' emails, a subject line, and a note.

Step 2. Drag and drop your files

Step 3. Set a challenge and send

Set a challenge question to authenticate your recipient, then send your secure message.

Step 3. Set a challenge and send!
Step 1. Create a free Mailock account
Step 2. Drag and drop your files
Step 3. Set a challenge and send!

Effortless filing

Filing our annual returns was effortless with Mailock. So convenient!

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Mailock user

Confidential transfer

I knew our company’s sensitive data was safe, which put me at ease.

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Mailock user

Business safe

Mailock is a lifesaver for keeping our business details secure and private.

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Mailock user

* How do we calculate sensitivity ratings?

We calculate sensitivity ratings based on the type, volume, and potential misuse of the information contained in each document.

Here’s how it works:

Type of Information

Documents containing highly sensitive details—such as personal identifiers, financial data, legal records, or biometric information—receive higher ratings.

Volume of Sensitive Information

The more sensitive details a document contains, the higher the score. For example, a tax document with extensive personal and financial data scores higher than a single-page appraisal.

Likelihood and Impact of Misuse

Documents that pose a greater risk if intercepted—like credit card details or bank statements—receive higher ratings. We also consider the consequences of a breach, such as fraud or identity theft.

Audience and Context

Some documents, like asylum applications or legal case files, are rated higher due to the severe personal, professional, or legal consequences of exposure.

Scoring Scale

85–100: Highly sensitive, with significant risk if exposed (e.g., credit card details, biometric data).

70–84: Moderately sensitive, containing private or exploitable information (e.g., tax documents, bank statements).

Below 70: Lower sensitivity, but still requiring secure handling (e.g., property appraisals).

This method ensures our sensitivity ratings accurately reflect the level of protection needed for each document type.

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Get started

Send your annual return now

Sign up for a free Mailock account to send your annual return securely.