When do you need both letters testamentary and will to record deed?

You need both letters testamentary and a will to record a deed when the property in question is part of a deceased person's estate that is going through probate. The will provides proof of the deceased's intentions regarding the property, while the letters testamentary, issued by the probate court, grant the executor the authority to manage and distribute the estate's assets. Both documents are necessary to ensure that the transfer of property is legally recognized and valid.