There is a version of a transfer where a club pays nothing and the deal is still expensive. The signing-on fee is usually why.
What it is
A signing-on fee is a payment to the player for agreeing to sign. It is not wages, and it is not the transfer fee, which goes to the selling club.
It exists because the player is giving something up: an existing contract, a city, a settled family, the leverage of running down a deal. The signing-on fee prices that.
Why it is almost never a lump
The phrase suggests a briefcase on day one. In practice the fee is split into instalments, typically one per contract year, paid on a fixed date each season.
Both sides want that. The club spreads the cash and keeps a lever: the instalments usually stop if the player leaves, so a player who wants out mid-contract is walking away from money he has not been paid yet. The player gets a payment that is not contingent on selection, form or fitness, which wages effectively are once bonuses are counted.
Where it sits in the accounts
This is the detail that makes it more than trivia.
A transfer fee is amortised across the contract. A signing-on fee is generally treated as part of the player's remuneration and hits the accounts as it is earned, rather than being written down as an asset over five years.
So two deals with identical headline economics can look different in a club's books depending on how much of the money went to the selling club and how much went to the player. Clubs under profit and sustainability pressure care about that distinction a great deal, and it is one reason the split between fee and personal terms is negotiated rather than assumed.
The free transfer that is not free
Karl Darlow joined Manchester United from Leeds United on a free transfer this summer, per Sky Sports and ESPN.
No fee reached Leeds United. That does not make the deal costless. On a free, the selling club's share of the money is zero, so the player and his representatives have the entire pot to negotiate over. Signing-on fees on frees are routinely larger than on the same player bought for money, because there is more room and because several clubs can bid without needing anyone's permission.
The old line is that a free transfer just moves the money from the club to the player. It is close enough to be useful.
Signing-on fee against loyalty bonus
The two get confused because both are lump payments outside wages.
A signing-on fee is paid for arriving, in instalments across the deal.
A loyalty bonus is paid for staying, usually on reaching a date or a fixed point in the contract, and it is the one designed to make the last two years of a deal less attractive to leave.
A player who runs a contract down to its final months has often already collected both, which is part of why the final six months are where the leverage sits.
The one-line version
The transfer fee is what the club pays to get the player out of somewhere else. The signing-on fee is what the player is paid for agreeing to come, and it is the number that makes a free transfer cost real money.
Sources: Sky Sports and ESPN, 13 August 2026, on Karl Darlow's free transfer from Leeds United to Manchester United; this archive's glossary entry on the signing-on fee.