Liverpool Wavertree MP Luciana Berger says people across the North West have been waiting for up to 12 months for benefit payments they're entitled to.
Personal Independent Payment (PIP) replaced DLA last year and have been criticised by MPs and charities for because of the delays.
Ms Berger, the Shadow Minister for Public Health, is raising it Parliament today, saying there is particular problem in Merseyside.
Speaking ahead of the debate at the House of Commons, the MP said: "The government claimed that ‘PIP’ payments would offer people with long-term ill-health or a disability support with extra costs so that they can still live a full and independent life.
"Instead, people have faced costly delays, sometimes for months on end, without the help they need."