Yes, there is a case for abolishing imputation, if it then results in lower tax.
My preferred tax rate is 18% initially collected as a stand alone unavoidable expenditure tax, that would finally include all those who currently avoid a fair share.
In a 1.6 trillion economy, an 18% expenditure tax, would contribute around 380 billions net!
Inclusion of all offshored corporations and others, would more than treble the total tax take, fixing for all time, the structural deficit!
As revenues increased, the rate could be dropped.
Other reforms like direct funding of all social service, and vastly more regional autonomy, would lower government spending on education, public health and other social amenities, by at least 30%.
Welfare for the rich could be replaced by a significantly, lower tax, along with the jettisoning of fuel excise and the GST.
Ditto payroll tax, PAYE, PAYG, etc.
I mean. giving with one hand and taking with the other, as practiced now, is always accompanied by horrendous and entirely unnecessary bureaucratic and other costs, in both exchanges!
And that is just not the way to smaller govt!
Given, we finally include the 95% of offshored Australian corporations; the individual tax take could be far lower, say 5% variable, collected as a stand alone unavoidable expenditure tax.
And the inclusion of all the foreign nationals who do business here, but currently escape most or any tax liability, due to vagaries in the global market, would also be finally and fully included, as would sham religions!
This additional revenue, would hugely advantage all those currently carrying the entire tax load by themselves, as well as setting aside, for all time, the so called, destiny of demography.
Now, if we were half as smart as we think we are, we would couple what would then be the lowest tax system, to the worlds cheapest energy, and just allow the high tech companies of the world to flood in, along with millions of self funded retirees, now in the cross-hairs of European/American/Asian administrations/tax collectors!
Can't died in a cornfield over a century ago!
Rhrosty

Your article is to be congratulated.
Imputation credits made a huge difference to the operation of the Australian economy.
Under the dead and chaotic hands of Whitlam and then Fraser the economy could make no headway. 47% company tax followed by 60% tax ( an effective total tax of 78.8 cents per dollar) on the vital small businessmen using company structures levels led to devices such as "trading trusts". The 60% personal tax level,because of bracket creep, came in at relatively low levels.
Lack of imputation credits encouraged investment into non- employment creating real estate investment and listed trusts.-- and a general attitude that tax avoidance was a holy duty owed to the family. The small businessman felt as entitled to avoid tax as the peasant felt entitled to hide his grain and daughters from the robber baron. - And the Courts agreed.

Productivity would be encouraged by income tax which lined up with reality. Pay income tax on EVERYTHING you lay out to earn it, including reasonable cost of getting to work, cost of childcare, sickness insurance, medical insurance , reasonable life assurance and cost of education. Allow reasonable splitting of income among family members in accordance with cost of maintenance.
NO REBATES - only deductions. It would reduce the need for many government handouts and dramatically reduce the cost of administration of taxing and handouts.