CGT Tax due has changed on Self Assessment

I am in the process of completing a SA for my wife as she has sight problems. When we sold our rental property we completed the CGT form and it was based upon an income of £15,000 and we paid £5316 in tax. I have just filled in her SA and using the exact same figures for the sale, and it now says she owes over £5,000 - even though her income is as follows :work pensions £6,600 and Income Based ESA of £5,251. How has this gone up so much when the figures input are exactly the same - we can't afford this? Thank you.

Hi,

You need to ensure that you complete the section to show that the capital gains has already been reported and paid. This should then cancel out the charge.

Thank you.