On our 1985 H'31.
Storage: Usually from $3/ft-12/ft depends on many things especially where you are located. In seasonal areas they ususally charge you for a lift & splash and dry storage too.Utilities: Many marinas charge for electricity, some include it in the monthly rental.Insurance: Depending on your sailing areas and if you are going off shore. We pay about $350/yr on our 31'. Obviously this has to do with the type of policy (replacement cost coverage etc) and the value of the vessel.Taxes: In the state of California they charge based on the value of the boat and this runs about 1% of the assessed value of the vessel. In Nevada they charge a flat fee based on the size of the vessel.Registration: In the state of CA. this is about $5/yr. In NV this is included with your taxes.Maintenance: This is the UNKNOWN. This can be from serveral hundred dollars to several thousands. Replacement of belts, hoses, wiring, pumps, heads, faucets, oil, filters etc. Semi-annual bottom jobs ($15/20/ft). Then you have the expensive parts like sails and rigging. It is usually and endless flow. Then of course engine repairs, props, alternators, water pumps and every other thing that can go wrong (ie: compress post replacment).On an average we spend about $700/month + maintenance items. This includes the payments ($40k loan), insurance, fees, berthing and bottom maintenance. The boat stays in the water year round. And don't forget the new toys. Dodgers, biminis, dinks, GPS, computers.....