There are several types of online poker rakeback deals, ranging from contributed and shared rakeback to dealt rakeback and the type being discussed in this article known as tournament rakeback.
Tournament rakeback is earned according to your paid tournament entries. Every time you enter a tournament that incurs a buy-in + fee, you will be paid tournament rakeback based on the fee. For instance, a $10+$1 tournament would pay a percentage of the $1 fee back into poker account via rakeback. The largest tournament rakeback returns are usually earned by playing SNG tournaments.
Rakeback deals can turn a losing player into a profitable one, if you have a break even month at the tables then a large rakeback payment will boost your bankroll for the following month. For this reason you should look towards getting a high percentage deal of 33% or more.
Calculating the rakeback for SNG tournaments is very simple due to the fees being of a fixed amount, as opposed to cash where every hand can be vastly different from the next. This gives you the advantage of being able to plan ahead and incorporate future rakeback earnings into your expectations based on how many SNGs you play per day and your expected winrate.
Although a high percentage rate is recommended, you also need to lookout for a busy tournament section so there are always games available to play at your limit throughout the day, for this reason the first choice would be 33% Cake Poker rakeback and the high availability of tournaments.