In both the three and six month periods ended March 31, 2022, the increase in mutual fund distribution expenses was primarily due to recently expanding a relationship with a financial institution for which we pay a portion of platform fees.
: Comparing the three months ended March 31, 2021, to the three months ended March 31, 2022,
sub-advisory
fees expense decreased by 13.0%, from $1.8 million to $1.6 million. As a percentage of total revenue,
sub-advisory
fees expense decreased 2.4 percentage points to 20.3%.
Comparing the six months ended March 31, 2021, to the six months ended March 31, 2022,
sub-advisory
fees expense decreased by 4.0%, from $3.6 million to $3.4 million. As a percentage of total revenue,
sub-advisory
fees expense decreased 1.6 percentage points to 21.2%.
In both the three and six month periods ended March 31, 2022, the decrease in
sub-advisory
fees expense was due to decreased average daily net assets held in the
sub-advised
Hennessy Funds, with a slight additional decrease as a result of the Company no longer paying
sub-advisory
fees with respect to the Hennessy Energy Transition Fund and the Hennessy Midstream Fund after January 31, 2022.
Depreciation Expense
: Comparing the three months ended March 31, 2021, to the three months ended March 31, 2022, depreciation expense decreased by 20.6%, from $0.06 million to $0.05 million. As a percentage of total revenue, depreciation expense decreased 0.2 percentage points to 0.6%.
Comparing the six months ended March 31, 2021, to the six months ended March 31, 2022, depreciation expense decreased by 17.6%, from $0.13 million to $0.10 million. As a percentage of total revenue, depreciation expense decreased 0.2 percentage points to 0.7%.
In both the three and six month periods ended March 31, 2022, the decrease in depreciation expense resulted from fewer fixed asset purchases.
Comparing the three months ended March 31, 2021, to the three months ended March 31, 2022, interest expense increased from $0 to $0.5 million. Comparing the six months ended March 31, 2021, to the six months ended March 31, 2022, interest expense increased from $0 to $1.0 million.
In both the three and six month periods ended March 31, 2022, the increase in interest expense was due to our issuance of the 2026 Notes on October 20, 2021, for which we make interest payments quarterly, with the first interest payment made on December 31, 2021.
Comparing the three months ended March 31, 2021, to the three months ended March 31, 2022, income tax expense decreased by 14.0%, from $0.7 million to $0.6 million. Comparing the six months ended March 31, 2021, to the six months ended March 31, 2022, income tax expense decreased by 27.7%, from $1.3 million to $1.0 million.