When does Seller Pay Taxes on Contract for Deed / Land Contract?

[Justin Hennig]

When an owner sells their property on a contract for deed, do they pay taxes on the whole amount at the date the Contract for Deed is signed and put into place, or after the CD is satisfied and deed is actually transferred?

I always thought taxes are only paid on the down payment and the principle and interest as it comes in every year.

Thanks BP Community!