Short answer
Section 24 mainly affects personally owned residential rental property because finance costs may not be fully deducted before calculating taxable rental profit. Limited company ownership is taxed differently, but it is not automatically better.
How it works in Koreograph
Create separate scenarios for personal ownership and limited-company ownership if both are realistic. Compare cashflow after finance, tax, fees, retained profit and extraction assumptions.
Developer view
For leveraged buy-to-let investors, Section 24 can turn a positive pre-tax deal into a weak after-tax deal. Company ownership can help some strategies, but mortgage pricing, admin, accountancy, dividend extraction and long-term plans all matter.