The multiplier effect

Your margin loan account has funds available if the loan balance (the amount you have borrowed) is less than the loan limit (the amount you can borrow). The multiplier effect means you can borrow up to four times the funds that were originally available (depending on the lending ratio assigned to the new investments).
The multiplier effect of geared investing
  Rod's ungeared portfolio Rod's geared portfolio

Value

$40,000

$160,000

Loan limit (at 75%)

$30,000

$120,000

Loan balance

$0

$120,000

Funds available

$30,000

$0

Rod's ungeared portfolio
Rod has a share portfolio with a market value of $40,000. He decides to take out a margin loan to increase his portfolio size. For the purpose of this example, Rod can borrow up to 75% of the value of his existing portfolio - $30,000 as available funds for additional investing.
Rod's geared portfolio
If Rod invests into approved securities with a lending ratio of 75%, he needs to provide 25% of the purchase. By using his available funds of $30,000 to provide 25% of the purchase, he can borrow an additional $90,000 and acquire further investments up to a value of $120,000, taking the total value of his portfolio up to $160,000.
The downside to the multiplier effect
Gearing can magnify both the gains and the losses in an investment portfolio. In Rod's case, he will be paying interest on $120,000 ($30,000 + $90,000). Find out what is the risk.

Rod's original portfolio
 
Geared investing

Find out more about BT's margin lending.
Download a copy of 'Margin lending made easy' (PDF, 557 KB).
Read BT's margin lending case studies.
Find a financial adviser using BT's Adviser Referral Program.
Learn about BT's margin loans.