The organisation said that households are focusing on paying down their debts, meaning their total level of debt has not been changing much.
The number of mortgage approvals for house purchase also slumped to its lowest level in 13 months, which provided further evidence that it is getting tougher for people to take out a mortgage. There were 30,238 such approvals in May worth £4.9 billion.
Lenders have been tightening their borrowing criteria amid the weak economy, as well as putting up their rates for both new borrowers and more than a million existing ones.
There are hopes that a "funding for lending" scheme announced by the Bank of England and the Treasury earlier this month could help kick-start lending. Analysts have said this may put the brakes on recent rate increases although those currently unable to get a mortgage may see little improvement.
There were also 18,678 loans approved for re-mortgaging, worth £2.6 billion in May, the lowest number of loans since February.
Lenders and estate agents have also reported a dip in activity following the end of a two-year stamp duty concession for first-time buyers in March, which bunched up sales and saw a rush of people trying to beat the deadline.
Ed Stansfield, chief property economist at Capital Economics, said: "The drop in net lending can be seen as a natural by-product of the low interest rate environment. When interest rates are low, a higher proportion of the monthly payments made by a borrower with a capital and interest repayment mortgage are capital.
"Nevertheless, that does not seem to explain May's abrupt drop. After all, if anything, mortgage interest rates have been drifting up in recent months. The implication seems to be that either lenders or borrowers, or potentially both, became more cautious in May."
The above payments are for illustration purposes only. You need to consider any insurance payments that also need to be made. Please note that any changes to your mortgage, for example, as a result of changes to the Bank of England base rate (variable rates only) or any overpayments you make, may affect your monthly payments. * For interest only mortgages you need to add on the cost of repaying the capital with a repayment vehicle such as an ISA or endowment policy. Loan to value (LTV) restrictions apply.
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Goverment and bank of englands fault!!, why does the bank of england give loans to the banks at 0.75% which the bank don't lend to people wanting a mortgage, because they will use that money for loans and credit cards of rates above 10% +. . its a scam when the base rate is 0.5% and they charge around 4% + on mortgages yet if you have money in the bank they cant pay you any interest because the base rate is so low, they use the excuse of the libour rates being high between banks well thats crap because they don't seem to lend of each other better to get the bank of england to bail them out. A bank is a business and if it is failing then tough close it down no one else gets bailed out. better still if you have a wad in the bank earning you nothing draw it all out in cash, a run on the banks would teach them