lived assets to the estimated undiscounted future cash flows expected to result from use of the assets over their remaining estimated useful life. If adverse market conditions persist or there is further deterioration in the general economic environment due to the COVID-19 pandemic, there could be additional indicators that our assets are impaired requiring evaluation that may result in future impairment charges to earnings.
In addition, our results and financial condition may be adversely affected by federal or state laws, regulations, orders, or other governmental or regulatory actions addressing the current COVID-19 pandemic or the U.S. refining industry, which, if adopted, could result in direct or indirect restrictions to our business, financial condition, results of operations and cash flow.
Furthermore, the current COVID-19 pandemic has caused disruption in the financial markets and the businesses of financial institutions. These factors have caused a slowdown in the decision-making of these institutions, which may affect the timing on which we may obtain any additional funding. There can be no assurance that we will be able to raise additional funds on terms acceptable to us, if at all.
The foregoing and other continued disruptions to our business as a result of the COVID-19 pandemic could result in a material adverse effect on our business, result of operations, financial condition, cash flows and our ability to service our indebtedness and other obligations.
To the extent the COVID-19 pandemic adversely affects our business, financial condition, results of operations and liquidity, it may also have the effect of heightening many of the other risks described in the “Risk Factors” section included in our Annual Report on Form 10-K for the year ended December 31, 2019 and in this offering memorandum, as those risk factors are amended or supplemented by reports and documents we file with the SEC after the date of this offering memorandum.
Our working capital, cash flows and liquidity can be significantly impacted by volatility in commodity prices and refined product demand.
Payment terms for our crude oil purchases are typically longer than those terms we extend to our customers for sales of refined products. Additionally, reductions in crude oil purchases tend to lag demand decreases for our refined products. As a result of this timing differential, the payables for our crude oil purchases are generally proportionally larger than the receivables for our refined product sales. As we are normally in a net payables position, a decrease in commodity prices generally results in a use of working capital. Given we process a significant volume of crude oil, the impact can materially affect our working capital, cash flows and liquidity.
Our substantial indebtedness could adversely affect our financial condition and prevent us from fulfilling our obligations under our indebtedness.
Our indebtedness may significantly affect our financial flexibility in the future. As of September 30, 2020, we have total debt of $3,720.8 million, excluding unamortized deferred debt issuance costs of $43.1 million, and we could incur additional borrowing under our revolving credit facility. As disclosed in this offering memorandum, on May 13, 2020, we issued $1.0 billion in aggregate principal amount of 2025 Senior Secured Notes and on January 24, 2020, we issued $1.0 billion in aggregate principal amount of 2028 Senior Notes (the proceeds of which were used primarily to fully redeem the 2023 Senior Notes and to fund a portion of the cash consideration for the Martinez Acquisition). Additionally, during the nine months ended September 30, 2020, we used advances under our Revolving Credit Facility to fund a portion of the Martinez Acquisition and for other general corporate purposes. The amounts set forth above do not include any post-closing payments in connection with the Martinez Acquisition to the seller if certain conditions are met, including earn-out payments based on certain earnings thresholds of the Martinez refinery (as set forth in the sale and purchase agreement, for a period of up to four years following the closing date). We may incur additional indebtedness in the future, subject to the satisfaction of any debt incurrence limitation covenants in our existing financing agreements. Although we were in compliance with incurrence covenants during the quarter ended September 30, 2020 to the extent that any of our activities triggered these covenants, there are no assurances that conditions could not change significantly, and that such changes could adversely impact our ability to meet some of these incurrence covenants at the time that we needed to. Failure to meet the incurrence covenants could impose certain incremental restrictions on, among other matters, our ability to incur new debt and also may limit the extent to which we may make new investments or incur new liens.
Our future credit ratings could adversely affect the cost of our borrowing as well as our ability to obtain credit in the future.
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