Knowledge Base - TaxCalc

	HMRC Simple Assessments - why am I or my client receiving one? From June 2025, HMRC will begin issuing Simple Assessment letters providing a detailed calculation for any tax owed by customers for income received...
	20 May, 2025 Views: 0

	Client or Agent not authorised error when filing MTD VAT or Income Tax If you receive a response stating 'client or agent not authorised' when trying to file a VAT return or an MTD Income Tax (IT) quarterly submission,...
	20 May, 2025 Views: 5746

	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: 132472

	MTD for Income Tax - what to expect Making Tax Digital for Income Tax Self Assessment (MTD for ITSA) requires businesses and landlords with qualifying income to maintain digital...
	06 May, 2025 Views: 1305

	TaxCalc bookkeeping spreadsheet transaction templates for MTD To assist you with complying with digital links for MTD reporting, we have produced spreadsheet templates for recording transactions and summarising...
	01 May, 2025 Views: 7071

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	TaxCalc Release Notes 2025 Below are the Release Notes for TaxCalc 2025 releases. Click to see the Release Notes for 2013-2016 > 2017 > 2018 > 2019 > 2020 >...
	22 Apr, 2025 Views: 184730

	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: 132472

	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: 105999

	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: 90399

	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: 79962

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