When budgeting for a boat, consider ongoing costs like maintenance, storage, fuel, and insurance. Maintenance can vary but expect at least 10% of the boat's value yearly. Storage fees depend on your location and whether you choose marina or dry storage. Fuel costs fluctuate based on usage and engine type. Insurance is essential and can range widely, so shop around for quotes. Don't forget registration, safety gear, and unexpected repairs. Research local costs and consider joining a boating community for insights.