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How do I recover CIS tax deducted from a company
Unfortunately there is no facility to recover CIS tax through the CT600. CIS tax is an employment tax deducted from a limited company's gross...
rating 17 Feb, 2026 Views: 6932
Scaling TaxCalc on High resolution (HiDPI) Displays
In some cases high resolution (also known as HiDPI) displays may not display as intended. This problem is exacerbated on physically smaller Hi...
rating 13 Feb, 2026 Views: 2120
TaxCalc Release Notes 2026
Below are the Release Notes for TaxCalc 2026 releases. Click to see the Release Notes for 2013-2019 > 2020-2024 > 2025 Please note we phase...
rating 13 Feb, 2026 Views: 206931
System Libraries for Linux
TaxCalc uses the QT framework which, in turn, requires the following system libraries to be present on your Linux operating system. If any are...
rating 10 Feb, 2026 Views: 49
System Requirements for TaxCalc
TaxCalc is either ‘fully supported’, ‘partially supported’ or ‘unsupported’ running on the configurations of operating system as listed...
rating 10 Feb, 2026 Views: 27858


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TaxCalc Release Notes 2026
Below are the Release Notes for TaxCalc 2026 releases. Click to see the Release Notes for 2013-2019 > 2020-2024 > 2025 Please note we phase...
rating 13 Feb, 2026 Views: 206931
What is a 1046 authentication error?
When you receive a 1046 error message in TaxCalc (as shown above) after attempting to file tax return, it will be due to one of the following: ...
rating 13 May, 2025 Views: 139465
Update to refunds made by HMRC
On 1st April 2015, HMRC updated their system to change the way they allocate repayments of overpaid tax. HMRC will only process the refund using...
rating 14 Feb, 2023 Views: 112011
Useful HMRC links and contact numbers
Personal Tax How to pay HMRC – Different ways to pay your Income Tax or Capital Gains Tax Online Services Helpdesk – Help signing up for...
rating 28 Jun, 2017 Views: 106860
How do I download TaxCalc?
To download and install TaxCalc on a new computer, or update it on a computer that already uses TaxCalc, we recommend viewing our video tutorial...
rating 25 Oct, 2022 Views: 92105