MPs in the House of Commons earn a healthy wage, far above the UK annual average of £31,461. With a standard annual rate of £81,932, MPs earn far more than most Britons, and that's before any other earnings are considered. So what are the laws here?
MPs are allowed to have second jobs as long as they aren't ministers.
Ministers are those MPs appointed by the Prime Minister to serve in Government.
Currently, there are 123 ministers out of the 650 MPs making up the House of Commons - that leaves 527 MPs free to seek additional earnings and hold second jobs.
But they can't keep this a secret - MPs must publicly declare any additional income, along with gifts, donations and shareholdings over 15 percent.
READ MORE: Starmer shamed for earning £247-an-HOUR from second job
According to the register, more than 200 MPs have received earnings in the past year on top of their annual £81,932 salary for being an MP.
These additional earnings range from £50 to almost a million.
The register is publicly available - you can find the most recent one here, with all MPs listed.
Simply click on your MP and all the information on second earnings (if there are any) will be there.
Generally, MPs who serve as doctors or nurses as their second job aren't seen as an issue.
The current debate is mainly regarding MPs who earn money as consultant or advisers, as this is seen as an exploitation of their role to earn money.
The rules state MPs are "strictly forbidden" from getting paid "in return for advocating a particular matter" in Parliament, but there is nothing to say they can't use their influence outside the House.
The debate now hinges on whether the rules should be amended to prevent which - if any - second jobs MPs should be allowed to hold.
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The following MPs have registered income from consultancy work in the last year.
Note there is no implication that any of these MPs listed below have broken any rules.