Knowledge Base Articles

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2970 articles

business-tax-period-start-date-not-known-library-error-illegal-ctap

Business Tax-Period Start Date not known, Library Error-Illegal CTAP

This is normally an incorrect CTAP period you have saved in AP/BT for the company – you will need to…

ptp-how-to-update-ptp-tax-platform

PTP - How to Update PTP Tax Platform

This guide will show you how to update PTP Tax Platform to the latest version. Please follow the instructions below.…

ptp-how-to-install-ptp-share-register

PTP - How to Install PTP Share Register

This guide will show you how to install PTP Share Register as a brand new installation. Please follow the instructions…

personal-tax-identity-verification-precondition-failed

Personal Tax- IDENTITY VERIFICATION PRECONDITION FAILED

This is a new error started in 2022 and also in 2024 and is coming from the HMRC system. They…

ptp-how-to-install-ptp-tax-platform

PTP - How to install PTP Tax Platform

This guide will show you how to install PTP Tax Platform as a brand new installation. Please follow the instructions…

aml-how-to-install-iris-anti-money-laundering-desktop-version

AML - How to install IRIS Anti Money Laundering (Desktop Version)

This guide will show you how to install IRIS Anti Money Laundering as a brand new installation. Please follow the…

personal-tax-and-vat-filer-you-get-a-mtderror-log-file

Personal Tax and VAT Filer- You get a MTDerror.log file

When you load a client or do a certain action, an MTD error log may appear and asks you to…

change-period-end-date-on-accounts-production

IRIS Accounts Production

Change period end date on Accounts Production

Advised user to go to Edit| account period end date| add| enter in date| ok.

personal-tax-hmrc-data-retrieval-authorised-agent-identical-names-showing

Personal Tax/VAT- Authorised Agents identical names showing? Cannot get HMRC login screen to appear.

This article is relevant for PT users (to use HMRC data retrieval) and VAT filer users (to retrieve Period dates…

business-tax-enter-dtr-double-taxation-relief-in-corporation-tax-ct600

Business Tax- Enter DTR (Double Taxation Relief) in Corporation Tax CT600

Please go to: Data Entry - Calculation - Reliefs and Deductions in Terms of Tax Edit DTR Enter the amount…