For 2014, the biggest change known at the moment is the update to personal allowances to £10,000 and the reduction of the higher rate band starting threshold to £31,865.
The customisable aspect of this tax calculator is also based upon date of birth, so as before you can adjust each date of birth allowance band by entering a new allowance figure or adjusting the sliders.
We have added figures provided in the 2013 UK Budget. Updated figures will be added as soon as they are published.
Updated - Official figures from the 2013 Autumn Statement have been added.