To some, it is a sad indictment of the modern world of football that transfers are seen as so important that they can dominate the discord. To others, the idea of their club signing a player is a thrill that is almost as good as winning a trophy.
Many of us feel as though we understand the bare bones of how transfers work, but whether that’s true or not will probably depend on the likes of the role that you have in life and how much attention you actually pay.
Certainly, the ‘transfer add-ons’ that are included in a transfer fee seem to have become all-pervasive, but what are they actually about?
The Basic Fee
When a football transfer takes place, the first figure that you are likely to read about is the basic fee. This is the amount that one club agrees to pay another, irrespective of how well the player does for their new paymaster. The exact manner in which the basic fee is paid will differ from one deal to the next, with each club negotiating whether or not they are to receive the fee upfront or simply to be paid it over a period of time.
Imagine, for example, that the basic fee of a transfer of a player from Bayer Leverkusen to Tottenham Hotspur is £60 million, how could that be paid?
Luis Díaz will arrive in Munich tomorrow. Medical scheduled on the same day. €70m fixed fee plus €5m add-ons. 4 + 1 year contract [@Plettigoal]
— Unofficial Bayern & Germany (@imiasanmia.de) Jul 28, 2025 at 12:26
Obviously, the entire £60 million could be paid as a lump sum. Many clubs would struggle to have that much cash available to them, however. As a result, Tottenham could agree to pay £60 million upfront, with the other £40 million paid in £5 million chunks over the following eight months.
This is the kind of thing that is part of the overall negotiations and can also be a part of the reason why transfers fall apart when the two clubs aren’t able to agree on how the fee is paid. For one club, getting the majority of the cash upfront could be key to allowing them to make signings of their own.
Add-Ons
What goes on top of that basic fee are the add-ons. These are a way for a side to future-proof itself against the player going on to become a world-beater on someone else’s watch.
You will often hear talk of some add-ons being unrealistic, whilst others are labelled as ‘achievable’. In short, the add-ons are amounts that the buying club will pay on top of the basic fee, should certain conditions be met over the course of the player’s contract. A selling club could demand an extra £20 million if the player goes on to win five successive Ballon d’Or trophies, for example, which would be unrealistic.
🚨 RB Leipzig view Newcastle offer for Benjamin Sesko as insufficient. #NUFC proposal €75m + €5m after #RBLeipzig asked interested clubs for ~€75m + add-ons + sell-on. #MUFC pursuit also continues but no bid yet. 22yo undecided. W/ @SebSB @TheAthleticFC https://t.co/Jc6WsyixbF
— David Ornstein (@David_Ornstein) August 2, 2025
Alternatively, a nominal fee could be owed if the new team finishes in the Champions League places the following season, perhaps, whilst a larger fee will be payable should the team win the league within the next three seasons.
When Anthony Martial moved from Monaco to Manchester United in the September of 2015, the clubs agreed a basic fee of £36 million but with add-ons that could take the fee to nearly £60 million. Those add-ons seem silly in hindsight because the player didn’t amount to much, but at the time the selling club felt that they were losing a player with the promise to become one of the best in the world.
Why They’re Accepted
Given the fact that add-ons can end up in the buying club paying significantly more than the initial sum agreed for a player, you might well wonder why it is that they accept them in the first place. It is fair to say that each and every case is different, but they are often used as a way of ensuring that a club will meet the asking price for a player without actually needing to meet that price upfront.
Let’s say that the selling club wants £50 million for their player, but the buying club only wants to pay £40 million. The other £10 million could be negotiated in add-ons in order to allow those two figures to meet.
Agents need to be careful about the add-ons that they’re willing to accept being put into a contract, because they can end up in a situation where their client doesn’t end up being played. Imagine a scenario whereby a player’s contract states that the selling club will be owed an extra £5 million for every 20 games that they play. If they end up being a world-beating talent, then it is worth the while of the buying club to pay them, but if they struggle, then there is no incentive to play them into form because it will end up costing them money to do so.
Add-ons can be a clever way of balancing accounts, but they can also backfire.