Re: 20 year boat loan
If you don't intend on having the boat for the full term of the loan, perhaps you're going to upgrade in a few years, or stop boating after the kids are gone, you may only be concerned about the monthly rate. You're renting the boat from the bank, so a lower payment per month is better. As long as you aren't upside down when you upgrade or get rid of the boat, this could make financial sense in some cases.
Another thing to consider is that some boats qualify as second homes. So the higher costs of a longer loan will be offset somewhat by the tax deductions, especially at the beginning. If you pay cash up front you can't leverage that.
However, I think most people just try to figure out how to get a monthly payment they can afford for the boat/car/whatever that they want. They don't look at the longer term costs.
If you don't intend on having the boat for the full term of the loan, perhaps you're going to upgrade in a few years, or stop boating after the kids are gone, you may only be concerned about the monthly rate. You're renting the boat from the bank, so a lower payment per month is better. As long as you aren't upside down when you upgrade or get rid of the boat, this could make financial sense in some cases.
Another thing to consider is that some boats qualify as second homes. So the higher costs of a longer loan will be offset somewhat by the tax deductions, especially at the beginning. If you pay cash up front you can't leverage that.
However, I think most people just try to figure out how to get a monthly payment they can afford for the boat/car/whatever that they want. They don't look at the longer term costs.