The Merchant McDonald Tax Tools App provides ou with a wealth of Tax Tools for your iPhone, for free!
First there is the GPS Based Business Mileage Calculator. Press the Start button and it uses the GPS within your iPhone to start tracking how far you travel. Stop it and save it at the end of the journey and mail your log to your accountant when you are ready. The Business Mileage Tool will continue even if you are taking phone calls or looking at other apps!
There are also a selection of useful tax calculators, from Income Tax to Stamp Duty to Salary Sacrifice to VAT and many more. You will also find the current tax year's Tax Tables to hand and some clever money saving tax schemes.
IMPORTANT - the Business Mileage Tool requires the use of GPS. Continued use of GPS in the background can dramatically effect battery life.