Members of the House of Lords who did not vote in the last parliamentary session claimed £100,000 in expenses, a report has found.
From 2010-15 a total of £360,000 was claimed by 62 peers who did not vote, the Electoral Reform Society said.
Most members are not paid a salary but can claim a daily allowance of up to £300 for Parliamentary duties.
The ERS said the Lords was “growing out of control” but a peer told the BBC that they do more than just vote.
Darren Hughes, deputy chief executive of the ERS, said: “The prime minister said he regrets not reforming the second House in the last parliament.
“It’s time for him to act and finally fix our broken upper chamber.”
However, Baroness Flather – a former Conservative peer who is now an independent, or “crossbencher” – said the report “missed the point”.
She said some crossbenchers rarely vote, but they still contribute to sittings by raising questions, speaking in debates and by meeting people.
“I speak all the time in debates and questions. I became a crossbencher because I want to speak about issues I know the Tories don’t want me to speak about.