Self-Employed Tax Return and Structure Review

I've been running a freelance consulting business for three years now, operating as a sole trader. My accountant has suggested I might benefit from incorporating as a limited company, but I'm unsure about the tax implications and whether it's worth the extra admin. I need straightforward advice on corporation tax, dividend allowances, and national insurance contributions to help me decide. My turnover is around 85,000 annually and I want to understand the real numbers before making any changes.