That $40 billion figure is dependent on the goods and services tax (GST) being increased to 12.5% across the board, scrapping the 'big five' areas where GST doesn't apply, which are fresh food, childcare, education, water/sewage/drainage and health.

If the rate is increased from 10% to 12.5% while still exempting the big five, that figure would be $14.5 billion, and if the rate stays at 10% yet the exemptions are scrapped, that would yield an extra $20.7 billion in revenue.

Currently, the GST raises around $70 billion a year, or about 14% of Australia's total tax revenue.

Pricewaterhouse Coopers' (PwC) report titled 'How GST reform can help reboot prosperity for Australia' said broadening the GST is an efficient tax.

"As broad consumption taxes have a relatively minor distortionary impact on the behaviour of individuals and businesses, they do not impact economic growth to the same extent as other taxes such as corporate and (progressive) personal income taxes," the report said.

The report also said changes to the GST could be offset by adjusting personal income tax arrangements. 

Need somewhere to store cash and earn interest? The table below features introductory savings accounts with some of the highest interest rates on the market.

Provider

4000$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details
  • A high-interest online savings account with no monthly fees, easy withdrawals and award-winning digital banking
  • No withdrawal notice periods or interest rate penalties
  • Save up to 10% on eGift cards at over 50 retailers with Macquarie Marketplace

Savings Account (Amounts < $250k)

  • A high-interest online savings account with no monthly fees, easy withdrawals and award-winning digital banking
  • No withdrawal notice periods or interest rate penalties
  • Save up to 10% on eGift cards at over 50 retailers with Macquarie Marketplace
000$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details
*Rate varies on savings amount
  • Deposit $500 per month to get bonus interest
  • 5.50% p.a. available on total savings up to $100k.
  • 5.00% p.a. applies to savings between $100k-250K.
  • Tiered bonus rates apply. (TMDs at ubank.com.au)
*Rate varies on savings amount

Save Account (>$100,000)

  • Deposit $500 per month to get bonus interest
  • 5.50% p.a. available on total savings up to $100k.
  • 5.00% p.a. applies to savings between $100k-250K.
  • Tiered bonus rates apply. (TMDs at ubank.com.au)
4000$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details
  • For deposit amounts $0 - $49,999
  • New ING personal savings customers receive an introductory bonus 0.50% p.a. variable kick starter rate for the first 4 months on balances up to $500,000.
  • Reverts to variable ongoing rate. T&Cs apply.

Savings Accelerator (Amounts < $50000)

  • For deposit amounts $0 - $49,999
  • New ING personal savings customers receive an introductory bonus 0.50% p.a. variable kick starter rate for the first 4 months on balances up to $500,000.
  • Reverts to variable ongoing rate. T&Cs apply.
010000$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details
  • Deposit at least $1,000+ each month from an external source
  • Make 5 or more eligible transactions
  • Grow your savings balance each month

Savings Maximiser (<$100k)

  • Deposit at least $1,000+ each month from an external source
  • Make 5 or more eligible transactions
  • Grow your savings balance each month
05001$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details

Goal Saver

    050$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details

    Young Saver Account

      000$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details

      Smart Saver Account (Under 25)

        00.011$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details

        Reward Saver Account($0-$100k)

          0501$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details

          Save up

            02000$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details

            Bonus Saver (<$1 Million)

              000$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details

              ANZ Save

                01000$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details

                Bonus Saver Account (Amounts < $100k)

                  5000$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details

                  NetBank Saver

                    00.010$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details

                    Life (< 30 years) (Monthly deposit)

                      010000$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details

                      Boost Saver

                        020000$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details

                        HomeME Savings Account ($0 - $100,000)

                          02001$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details

                          Growth Saver ($1 - $25k)

                            010000$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details
                            For customers aged 14-35 years
                            For customers aged 14-35 years

                            Future Saver Account ( < $50k)

                              0201$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details

                              Reward Saver Kick Start (Amounts ≤ $1m)

                                010000$product[$field["value"]]$product[$field["value"]]$product[$field["value"]]More details

                                Saver Account (<$250k)

                                  Important Information and Comparison Rate Warning

                                  All products with a link to a product provider’s website have a commercial marketing relationship between us and these providers. These products may appear prominently and first within the search tables regardless of their attributes and may include products marked as promoted, featured or sponsored. The link to a product provider’s website will allow you to get more information or apply for the product. By de-selecting “Show online partners only” additional non-commercialised products may be displayed and re-sorted at the top of the table. For more information on how we’ve selected these “Sponsored”, “Featured” and “Promoted” products, the products we compare, how we make money, and other important information about our service, please click here. Rates correct as of July 22, 2024. View disclaimer.

                                  However, the report did go on to say GST as a whole is regressive because it disproportionately affects low-income households.

                                  "A household in the lowest income quintile spends close to 10% of gross income on GST-exempt food, while a household in the highest income quintile spends around 6% of its gross income on GST-exempt food," the report said.

                                  PwC's report also said GST collection since the global financial crisis of 2007-09 has not recovered.

                                  Australia is also the fourth-lowest value-added taxing country in the OECD, with European countries often taxing more than 15% VAT (value-added tax) - Hungary's is 27%.

                                  Canada, in contrast, has a federal rate of 5%, however consumption taxes are also provincial - in British Columbia, for example, its sales tax is 7%, for a total of 12%.

                                  The report comes after the GST in Australia celebrated its 20th anniversary, as it was introduced under the Howard Government in the year 2000.

                                  'CakeGate': In 1993, then-Liberal Opposition leader John Hewson attempted to explain GST.