After a round, you will earn money but also run the risk of having it stolen. Make sure to deposit it quickly, and crouch while you are in the process of depositing. It's safest to deposit small amounts of currency at a time, or to have a teammate cover you, so that you're not an easy target for your foes. You can also use your Titan for extra protection. Of course, it also pays to keep in mind that your foes will be applying the same strategies. If you can get to them before their money is secured, you can really help out your team.