Banks don't have to pay out compensation to customers if there has been a drop in service, unlike how telecoms companies have to.
But if you have incurred costs as a result of service issues, it's likely you could get your money back.
For example, if a bill payment didn't go through as a result of an outage and you’ve been charged a fee for missing it, you should be able to claim that money back.
Over 5,600 users have reported issues with HSBC's banking app this morning, as per Downdetector.
Most users claim they are unable to log in or transfer money via the mobile app.
HSBC's online banking app has been hit with an outage this morning, leaving thousands of customers furious.
Customers complained of issues with their mobile and online banking, as well as logging in.
HSBC customers took to social media to highlight the service issues.
One said: "It seems to be down no official word from HSBC as of yet but loads of people are having the same problem with this."
Another added: "@HSBC_UK your app service is not working, it states service unavailable and multiple people have reported it."