Let’s look at the numbers and see if they are right. As you can see on The Salary Calculator “about” page, the current allowance is £6,475 for under-65s. Increasing this to £10k would give everyone an extra £3,525 untaxed, and for those in the 20% tax band this would be £705, matching what the Lib Dems claim.

However, they have to raise this extra money from somewhere – as you can see on their website they have listed some areas they might take the money from, including taking National Insurance on benefits in kind and second jobs. Also, they may lower the threshold between the 20% and 40% rates, meaning smaller savings for those in the higher bracket.

At first glance, those in the 40% tax bracket will save even more with this increase in personal allowance (up to £1,410!), but if the threshold were lowered this effect would be smaller, and as you can see on the Lib Dem website, they also talk about modifying tax relief so that pension contributions are only tax free on the 20% rate. As always, the devil is in the detail!

Needless to say, should they come to power The Salary Calculator will be updated when they make good on this campaign promise.