Should he use bank interest to pay off taxes?

A company is offering a riba-based loan to its employees

Should he mortgage his house to a non-Islamic bank so that he can buy another house?

He gave his car to someone to sell it and buy a newer model for him. Is this riba?

Putting money in riba-based banks

Ruling on tawarruq involving metals via al-Jazeera Bank

Praying in a home that was built using an interest-based loan

Ruling on exchanging a large piece of land for another that is smaller but closer to the city?

Amaanah financing from HSBC

Working in an audit firm reviewing accounts which involve riba, insurance and taxes