Combining finances after marriage involves honest communication, shared priorities, a combined budget, and a spending plan. Tools like a finances-conversation toolkit can help couples discuss and manage money effectively, including setting dedicated times for talks, full disclosure of financials, and establishing a no-judgment zone. It's important to align financial goals, create systems, allocate roles, and have a decision checklist. Regular financial check-ins are crucial. Prenups can be a helpful tool before marriage to manage financial expectations and protect assets.