Knowledge Base - TaxCalc

	System Requirements for TaxCalc TaxCalc is either ‘fully supported’, ‘partially supported’ or ‘unsupported’ running on the configurations of operating system as listed...
	23 Jan, 2026 Views: 27272

	How to fix the TaxCalc display when the High DPI settings are set incorrectly In some cases users prefer to change the zoom settings in TaxCalc rather than their display settings, However, if too radical a change is made to...
	22 Jan, 2026 Views: 3849

	Known issues in the latest released version of TaxCalc Below is a list of notable issues that have been reported in recent versions of TaxCalc since their release. Other issues may exist that have not...
	21 Jan, 2026 Views: 47796

	MTD Quarterly Filer - known errors From initial testing we have established the following issues when setting up/submitting quarterly updates: HMRC error '403 Client or Agent Not...
	21 Jan, 2026 Views: 559

	How do I complete a return for a foster carer? You need to take certain things into account when completing the return, for example, the qualifying amounts that you can deduct from total care...
	20 Jan, 2026 Views: 44761

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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...
	08 Jan, 2026 Views: 205816

	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: 138169

	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: 111001

	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: 105564

	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: 90679

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