Salisburybod70

Hi, wondering if anyone can help? I am trying to complete Self Assessment Tax Return but don't know where to put the following info: In Tax Year ending 5.4.23 I was overpaid ESA (contribution-based). This ESA was listed as taxable income on my P60U, and on my Tax Return for that year. I recently found out that I had been overpaid by about £5K. I returned this overpayment on 25.4.24. As I will have already paid tax on income that I have returned, I am wanting to reclaim this tax. I spoke to an HMRC agent, who didn't understand and simply told me 'ESA benefits are not taxed'. This is incorrect, as my ESA was contribution-based (which is taxed) rather than income-based (which is not taxed). I have tried putting a negative amount in on the 'Benefits' section of the Tax Return, but this is disallowed. Help! Any thoughts?