According to the Department for Work and Pensionsif you're a couple with two children you are living in poverty if, afterhousing costs, you have £357 a week.
If you're a couple without children, that figure is £220 a week.
The Chief Executive of Trust for London, which commissioned the research has called on policymakers to tackle the issues by building more affordable housing and employers to pay a Living Wage.
Housing benefit will no longer cover the housing costs of private renting, workless families with 3 or more children anywhere in London.
For low-income single adults without children, a third of London's boroughs (34%) are unaffordable under the welfare reforms.
Demand for the cheapest properties means that even 13 of London's 19 outer boroughs are unaffordable for families reliant on housing benefit.
The main findings of the report looking at the circumstances of the 2.1 million people who are living in poverty in London are:
- 58% of those in poverty live in Outer London (10 years ago it was 50%)
- For the first time there are more private renters in poverty than social renters
- 43% (830,000) of people in the private rented sector live in poverty, more than any other tenure (this figure has doubled in the last 10 years)
- Almost 1 in 5 working Londoners (17%) were paid below the London Living Wage (£8.30) in 2012. This is an increase of more than 40% over 5 years and means 600,000 people are in low-paid jobs
- The majority (57%) of working-age adults and children in poverty are now in families that work
Housing costs are not just a problem for those in the centre of London without a job: 50% of housing benefit claimants live in outer London and 40% are in work.
A quarter of all households in London rely on housing benefit to meet their housing costs, compared to a fifth in England as a whole.
High housing costs mean that benefit cuts will be much deeper in the capital. Rents here are as much as twice the England average: £950 in outer London and £1,300 in inner London.
Young adults are among the largest group affected. London attracts increasing numbers of young people seeking opportunities but unemployment among 16 to 24 year olds in the capital has risen from 15-25% in the last 10 years.
The fourth edition of London's Poverty Profile shows that 28% of people in London are in poverty. This is seven percentage points higher than the rest of England and of the 20 English local authorities with the highest levels of child poverty, seven are in London.
The unemployment rate in London at 7% is still higher than the England average, while in the 'Olympic boroughs' of Barking & Dagenham and Newham it is 10%, higher than any of the major English cities.
A UNISON survey published today reveals the shocking impact of child poverty in schools around London . The survey shows that 72 percent of those surveyed in London believe that children at their school are living in poverty.
School staff believe the damaging effects on pupils are clear and poverty is on the rise all across the capital.
All week we've been exploring the issue of poverty in London - how many are living in squalid, overcrowded conditions, some even in slums.
Tonight we're reporting on how older Londoners are trying to survive on their pensions.
As part of our special series on poverty in the capital, Ria Chatterjee has met one woman who is so poor she's living in an old air raid shelter.
All week, we have been reporting on some of London's poorest residents.
Today we hear from a pensioner and widow forced to sleep in an air-raid shelter because she's been priced out of the housing market.
Ria Chatterjee's been to meet her.