be a function of continued concerns over safety or a permanent shift by consumers to DIY or virtual tax preparation methods. We may make changes in our operations to react to, or in anticipation of, such a shift in consumer behaviors, but such changes may not be successful in retaining current clients or attracting new clients to our brand.
The further spread of COVID-19 or a new global or national outbreak, the requirements to take action to help limit the spread of illness, and the other risks described above may further impact our ability to carry out our business and may materially adversely impact global economic conditions, our business, results of operations, cash flows and financial condition.
Our access to liquidity may be negatively impacted by disruptions in credit markets due to COVID-19 or otherwise, by downgraded credit ratings or by our failure to meet certain covenants. Our funding costs could increase, further impacting earnings.
We need liquidity to meet our working capital requirements, to service debt obligations including refinancing of maturing obligations, and for general corporate purposes. Our access to and the cost of liquidity could be negatively impacted by the COVID-19 pandemic, in the event of credit rating downgrades, or due to our failure to meet financial covenants. On March 26, 2020, we drew down the full $2.0 billion available under our unsecured CLOC to increase our cash position and maximize flexibility in light of the uncertainty surrounding the impact of the COVID-19 pandemic. The increase in the amount borrowed under the CLOC led to increased interest expense for the fiscal year ended April 30, 2020, which will remain elevated until such amounts are repaid. In addition, $650 million in principal of our Senior Notes are due in October 2020. Additional events may occur which could increase our need for liquidity above current levels. We may need to obtain additional sources of funding to meet these liquidity needs, which may not be available or may only be available under unfavorable terms. In addition, if rating agencies downgrade our credit rating, the cost of debt under our existing financing arrangements, as well as future financing arrangements, could increase and capital market access could decrease or become unavailable.
Our CLOC is subject to various covenants, and, as of April 30, 2020, we were not in compliance with the debt-to-EBITDA ratio covenant due to the impacts of the COVID-19 pandemic described above. Though the lenders under the CLOC waived non-compliance with this covenant as of April 30, 2020, there is no guarantee that they would waive any future covenant violations. If we violate this or other covenants in the CLOC in the future and are unable to obtain a waiver from our lenders, our debt under the CLOC would be in default and could be accelerated by our lenders. An acceleration of the indebtedness under the CLOC would cause a cross default under the indenture governing our senior notes. There can be no assurance that we will be able to obtain sufficient funds to enable us to repay or refinance our debt obligations on commercially reasonable terms, or at all.
The impacts of the COVID-19 pandemic, including a potential worsening of global economic conditions and the continued disruptions to, and volatility in, the credit and financial markets remain unknown. If current sources of liquidity were to become unavailable, we would need to obtain additional sources of funding, which may not be available or may only be available under less favorable terms. This could have a material adverse effect on our business and our consolidated financial position, results of operations and cash flows.
Changes in applicable tax laws have had, and may in the future have, a negative impact on the demand for and pricing of our services, adversely affecting our business and our consolidated financial position, results of operations and cash flows.
The U.S. government has in the past made, and may in the future make, changes to the individual income tax provisions of the Internal Revenue Code, tax regulations, and the rules and procedures for implementing such laws and regulations. In addition, taxing authorities in various state, local, and foreign jurisdictions in which we operate may change the income tax laws in their respective jurisdictions. As a result of the COVID-19 pandemic, on March 21, 2020, the U.S. Department of the Treasury (Treasury) and the IRS announced that the federal tax filing deadline for individual 2019 tax returns was extended from April 15, 2020 to July 15, 2020, and substantially all U.S. states with an April 15 individual state income tax filing requirement extended their respective deadlines. In Canada, the deadline for individuals to file was extended to June 1, 2020. These delays negatively impacted the demand for our services in our fiscal year ended April 30, 2020, resulting in a substantial decrease in the number of tax returns prepared by or through H&R Block, impacting our revenue, cash flows and earnings for the fiscal year ended April 30, 2020. Treasury, the IRS and state or foreign officials may determine to further extend tax deadlines or take other actions, which could have an additional material adverse effect on our business and our consolidated financial position, results of operations and cash flows in future years.