If you look at sportrac there is only one line number for dead money when you click on a specific players contract. That number is always in the current year.

Dead money disasters | National Football Post

When a player is released or traded, the remaining proration of the salary components that are treated like a signing bonus immediately accelerate into his team’s current salary cap. For example, if a player signs a five-year contract with a $5 million signing bonus, $1 million of his signing bonus counts towards the salary cap for each year of his five-year contract. If he is released after the second year of his contract, the $2 million of signing bonus proration from the last two years of the contract automatically accelerates into the club’s current cap, creating $3 million of dead money.