New Making Tax Digital ITSA Bridging Software
MTD ITSA Bridging Software for Excel
If your accounting system is based on spreadsheets or can generate CSV output then the 100PcMTD App is perfect for you.
Starting April 2026, HMRC is phasing in Making Tax Digital for the self-employed and landlords. The criteria for this are covered extensively elsewhere If you are affected, then you will be mandated to submit your return data digitally. The 100PcMTD App can interpret the data from your spreadsheet or CSV files and present it in the right format for filing electronically with HMRC's secure gateway.
How does it work?
- Watch the Preview Video overview: 100PcMTD Preview Video
What can I do to prepare?
Prior to the actual HMRC filing obligations, you can use our bridging software to test in the HMRC sandbox test environment. No data will be stored or used by HMRC, but it will give you an idea of the process and confidence that your data will be accepted by HMRC when you come to file for real.
OK. What do I need to test the MTD ITSA process with my data?
- A Windows PC or Laptop. (Linux and Mac App to follow soon)
- A copy of the preview 100PcMTD software. Download 100PcMTD Windows Installer
- A spreadsheet (Excel or OpenOffice in .xls .xlsx format) or CSV file incorporating our bridging template.
Download MTD data templates
- You will need to add the desired template tabs to your workbook and populate the data fields with the appropriate links to your data
- Install and Run and register the 100PcMTD App.
- Create a Test Individual Account and configure the desired businesses.
- Load and test the filing of your data
- Watch the MTD ITSA Test Tutorial Video: 100PcMTD Test Tutorial
Why Choose 100PcMTD?
- It's a standalone Desktop App, not a cloud solution. Your data is yours.
- It's compliant provided that your process incorporates the mandatory digital links.
- Your data stays on your PC and only the required data is sent to HMRC on submission.
- There is no significant setup or lock-in when using 100PcMTD. You can easily swap to something else if it doesn't work for you.
- Only an email address is required for registration and subscription management. We will never pass your details on to third parties unless obliged to by law.
- VAT reporting will remain FREE forever.
- Builds on our experience offering the free 100PcVatFreeBridge solution from day 1 of MTD.
- Uses the latest encryption and security standards for storing and transmitting your data.
- Your spreadsheets are opened 'read only' so that your data will not be modified. https secure communications are used to communicate with HMRC and our subscription server.
- 100PcMTD has been virus scanned and is 'Digitally Signed'. If you right-click on the installer and check that the digital signer is listed as 'Comsci Ltd' you can be sure that the App has not been tampered with.
- Early adopters / pre-release testers will be given subscription benefits.
- Pricing is as yet undecided but likely to be a cheap yearly subscription of around £20 -£30
Don't just take our word for it. Check Comsci's 'Excellent' rating on TrustPilot
