Borrowers and lenders continue to collaborate on fiddles to the classification of housing loans to assist selected customers enjoy lower interest rates.The Reserve Bank of Australia yesterday, in its assessment of financial aggregates for May 2016, explained that "following the introduction of an interest rate differential between housing loans to investors and owner-occupiers in mid-2015"  (in response to APRA measures to curtail growth in residential investment lending) "a number of borrowers have changed the purpose of their existing loan."The RBA said it estimated the net value of switching of loan purpose from investor to owner-occupier at A$41 billion over the period of July 2015 to May 2016, of which $1.1 billion occurred in May. This is equal to around eight per cent of total investment lending recorded for all banks.