Knowledge Base - TaxCalc

	How do I use excess pension contribution allowance carried forward from previous years? TaxCalc automatically offsets your pension contribution allowance against your pension contributions for the current year. If contributions have...
	04 Mar, 2026 Views: 4592

	HMRC Simple Assessments - why am I or my client receiving one? From 2025, HMRC began issuing Simple Assessment letters, which provide detailed calculations for any tax owed by customers for income received in...
	04 Mar, 2026 Views: 533

	How to enter Voluntary Class 2 NIC for Self-Employment, Partnerships and Lloyds If your profits (self-employment, Partnership and Lloyds) are less than the Small Profits Threshold, (* £6,845 for 2025/6) and you want to make...
	04 Mar, 2026 Views: 11269

	How do I claim relief for Research and Development from 1 April 2024? Merged Research and Development Expenditure Credit (RDEC) scheme from 1 April 2024 For Corporation tax accounting periods beginning on or after 1...
	04 Mar, 2026 Views: 3618

	CT600 losses and how to carry them back Carrying back company trading losses A company incurring a trading loss in an accounting period can make a claim to offset the loss against total...
	04 Mar, 2026 Views: 88888

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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...
	13 Feb, 2026 Views: 207487

	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: 139675

	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: 112103

	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: 107236

	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: 92536

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