Halifax MP Linda Riordan is renting out her second home to a fellow Labour MP while claiming thousands in expenses to rent a third property herself.
Mrs Riordan is thought to getting £19,000 a year from the controversial practice.
It is technically permitted under MP guidelines but Mrs Riordan has come under fire from from critics.
She rents out her £400,000 London flat to MP Iain McKenzie.
Mr McKenzie pays her £1,560 a month in rent - £18,720 a year - which he claims back from the taxpayer.
At the same time, Mrs Riordan claims £1,473 a month - £17,676 a year - from the taxpayer for renting a seperate flat in London for herself.
She also has a home in Northowram.
Mrs Riordan was due to hold one of her regular surgeries at Halifax Town Hall this afternoon but it has been cancelled.