Paul Edwards

My wife has not worked for a few years and we are fortunate to have a decent amount of savings. The interest she earned was below her personal allowance. However, we have both started to take personal pensions (our state pensions start next year) and she will now be having to pay tax. Is there an easy way to reconcile the figure of untaxed interest on savings shown on the "How we worked out your tax code" calculation in her Gateway account please? I know it is an estimate but I'd like to know how it has been calculated. Thank you