All the people on the deed are responsible to the government for the taxes, and action could be taken against any or all of them for nonpayment (and/or the property seized and sold at a tax sale for unpaid taxes). Among the five, the one who is currently getting the value or benefit of the property by living there (the life estate holder) would be responsible for all or at least most of the taxes (being the one getting the benefit) and the other people could sue him or her for the money if they are forced to pay it to avoid losing the property.