Knowledge Base - TaxCalc

	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...
	10 Feb, 2026 Views: 24

	System Requirements for TaxCalc TaxCalc is either ‘fully supported’, ‘partially supported’ or ‘unsupported’ running on the configurations of operating system as listed...
	10 Feb, 2026 Views: 27762

	How do I change the password for a user? Please see below the step by step instructions on how to change a password for TaxCalc users. Please note if you are using Email Login you will need...
	06 Feb, 2026 Views: 2505

	Claiming rent a room relief for one property and the property allowance for another property HMRC have confirmed that an individual can claim the property allowance for one property and rent a room relief for another. If rent a room income...
	04 Feb, 2026 Views: 6936

	SA900 Trust tax free amount from 6 April 2024 From 6 April 2024, HMRC abolished the default standard rate band (£1,000) for income tax on trusts and estates. Instead HMRC have introduced a...
	03 Feb, 2026 Views: 57

Most Viewed

	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...
	08 Jan, 2026 Views: 206699

	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: ...
	13 May, 2025 Views: 139423

	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...
	14 Feb, 2023 Views: 111981

	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...
	28 Jun, 2017 Views: 106756

	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...
	25 Oct, 2022 Views: 91968

Knowledgebase