Why Choose HMRC-Recognised Self Assessment Software for Accountants?

Team Nomi

Jul 21, 2026
6 minutes read

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Managing Self Assessment tax returns can be challenging, especially for accountants handling multiple clients and tight HMRC deadlines. Manual calculations, paperwork, and chasing client information can make the process time-consuming and increase the risk of errors. 

According to HMRC, around 12 million people are required to file a Self Assessment tax return each year, and more than 97% of returns are now submitted online, highlighting the growing shift towards digital tax filing. 

Choosing HMRC-recognised Self Assessment software or the best HMRC self assessment software can simplify the entire process by automating calculations, securely storing client information, validating returns, and enabling direct online submission to HMRC. 

What is Self Assessment software?

Self assessment tax return software is a digital tool that helps accountants, tax professionals, and individuals prepare and submit Self Assessment tax returns directly to HMRC.

Instead of completing paper forms or manually calculating tax figures, the software automates much of the process. It stores client information securely, performs tax calculations, identifies errors before submission, and files returns online.

Most HMRC-recognised software supports various tax return forms, including:

• • SA100 – Individual Tax Return
  • SA102 – Employment
  • SA103 – Self-employment
  • SA104 – Partnership Income
  • SA105 – Property Income
  • SA106 – Foreign Income
  • SA108 – Capital Gains
  • SA109 – Residence and Remittance

Using recognised software for self assessment tax returns helps ensure tax returns are prepared in accordance with HMRC requirements while reducing manual work. 

Who needs Self Assessment software?

Self assessment tax return software is useful for anyone responsible for preparing or submitting tax returns, including

• • Accountants and bookkeeping firms
  • Sole traders
  • Self-employed professionals
  • Business partners
  • Company directors
  • Landlords with rental income
  • Individuals with foreign income or capital gains

For accounting practices managing multiple clients, dedicated software for self assessment tax returns can significantly reduce administrative work, improve accuracy, and speed up tax filing.

Why choose HMRC-Recognised software?

HMRC-recognised software has been tested to meet HMRC’s technical requirements for filing tax returns online.

Choosing the best HMRC self assessment software offers several advantages: 

• • Direct submission to HMRC
  • Automatic tax calculations
  • Validation checks before filing
  • Improved data security
  • Reduced filing errors
  • Faster processing
  • Compliance with current HMRC standards

Using recognised tax self assessment software gives accountants confidence that returns are prepared and submitted correctly.

Benefits of using Self Assessment software

Using HMRC-recognised Self Assessment software helps simplify these processes by automating routine work, reducing errors, and improving overall efficiency. 

Whether you’re an individual accountant or managing a growing practice, the right software can save time and help you deliver a better service to your clients. 

Saves valuable time

Preparing tax returns manually can take hours, especially when dealing with multiple clients.

Self assessment software automates repetitive tasks such as:

• • Tax calculations
  • Data entry
  • Form validation
  • Document storage
  • Return submission

This allows accountants to spend more time advising clients rather than completing paperwork.

Improves accuracy

Manual calculations increase the chance of mistakes.

Modern self assessment tax return software automatically checks:

• • Missing information
  • Incorrect figures
  • Calculation errors
  • Incomplete forms

This helps reduce rejected returns and costly amendments.

Keeps client information organised

Instead of storing documents across emails and folders, software keeps everything in one secure location.

Accountants can easily access:

• • Tax returns
  • Client records
  • Supporting documents
  • Previous submissions
  • Digital signatures

Using software for self assessment tax returns improves efficiency throughout the year and makes client management much easier.

Simplifies HMRC compliance

Tax rules frequently change.

HMRC-recognised software is regularly updated to reflect the latest tax legislation, helping accountants remain compliant without manually checking every update.

Enhances client experience

Many software platforms provide secure client portals where clients can:

• • Upload documents
  • Review tax returns
  • Approve submissions
  • Sign forms electronically

This reduces delays and improves communication.

Features to Look for in Self Assessment Software

Not all tax software offers the same functionality. When comparing solutions, consider features such as:

• • HMRC Recognition: Ensure the software is officially recognised for electronic filing.
  • Cloud-Based Access: Cloud software allows accountants to work from anywhere without installing programs on multiple devices.
  • Automatic Tax Calculations: Built-in calculations reduce manual work and improve accuracy.
  • Client Portal: A secure portal makes it easy for clients to upload documents and communicate.
  • Electronic Signatures: Requesting eSignatures online speeds up approvals and reduces paperwork.
  • Document Management: Secure storage helps organise tax records and supporting documents.
  • Practice Management: Some platforms combine tax filing with workflow management, helping firms track deadlines and client progress.
  • Mobile Access: Mobile apps allow accountants to review returns and communicate with clients while away from the office.

When choosing the best HMRC self assessment software, look for a solution that offers all these features in one platform.

Manual Tax Filing vs Self Assessment Software

Why accountants choose Nomi

Nomi provides an all-in-one cloud platform designed to simplify tax compliance for accounting firms.

Key features include:

• • HMRC-recognised Self Assessment filing
  • Cloud-based access
  • Automated tax calculations
  • Secure document management
  • Client portal
  • Electronic signatures
  • Practice management tools
  • Mobile app for accountants
  • Direct HMRC submission

Rather than using multiple systems, accountants can manage client information, tax returns, documents, and communication from a single platform.

Conclusion

Preparing Self Assessment tax returns doesn’t have to be complicated. Using tax self assessment software helps accountants automate routine tasks, reduce errors, improve compliance, and save valuable time during busy tax seasons.

By choosing software for self assessment tax returns with features such as automatic calculations, secure client portals, cloud access, and direct HMRC filing, accounting firms can improve productivity while providing a better experience for their clients.

If you’re looking for the best HMRC self assessment software, Nomi’s HMRC-recognised self assessment tax return software combines tax filing, document management, client collaboration, and practice management in a single cloud platform, helping accountants manage their work more efficiently.

Frequently asked questions

1. Is HMRC-recognised software mandatory?
   Ans: No. However, using HMRC-recognised software makes digital filing faster, easier, and more accurate.

2. Can accountants file multiple tax returns?
   Ans: Yes. Most professional software allows accountants to manage and submit returns for multiple clients from one dashboard.

3. What is the SA100 form?
   Ans: The SA100 is the main Self Assessment tax return used by individuals to report income and calculate tax liabilities.

4. Can I amend a submitted tax return?
   Ans: Yes. HMRC allows amendments within the permitted time frame, and many software platforms support amended submissions.

5. Is cloud-based tax software secure?
   Ans: Most reputable providers use encrypted cloud storage and secure login systems to protect client information.