Your contribution level
In addition to choosing where your money is invested, you have the freedom to decide how much you are putting aside. The default option is 4%, but you are able to contribute up to 10% of your salary and have it matched by O2. You can contribute more than this if you want, but the maximum contribution from O2 is 10%.
This means that if you choose to put aside 10%, there will be 20% of your salary going in to your pension each year – which could make a difference to your life in retirement.