You can no longer buy Taxfiler. All the functionality has been incorporated into IRIS Elements Tax - https://www.iris.co.uk/products/iris-elements/tax/. The pricing remains the same.

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For accountants and tax advisors, the cost depends on the number of clients you wish to manage and starts at just £10 + vat a month for 10 clients and 1 user. For additional clients and multiple users, you can use the calculator here: https://www.iris.co.uk/products/iris-elements/tax/.