provided, that with respect to any day during the period from the date of the Promissory Notes through December 31, 2019, interest was calculated assuming that the unpaid principal balance of the Promissory Notes on such day is the unpaid principal amount of the notes on the last calendar day of the quarter in which such day occurs. Interest was payable upon the maturity date of the notes. Each of the Promissory Notes had an initial maturity date of March 30, 2020 and was extended through March 30, 2021 by amendments entered into effective as of March 30, 2020.
As of December 31, 2019, we had a receivable related to the Promissory Notes of $127.7 million. On December 31, 2019, AppGate spun-off from Cyxtera. As of December 31, 2019, we assessed collectability of the Promissory Notes from AppGate and reserved the entire amount of $127.7 million as the balance was deemed unrecoverable. In making that determination, we considered factors such as AppGate’s operating and cash losses since the initial acquisition into the Cyxtera group in 2017 through December 31, 2019, and AppGate’s anticipated cash needs and potential access to liquidity and capital resources over the remaining term of the note based on the facts and circumstances at the time.
During 2020, we advanced an additional $19.4 million to AppGate and recorded provision for loan losses in the same amount based on the same factors discussed above. Towards the end of 2020, AppGate benefited from an increase interest from customers as well as investors for its cybersecurity offerings, and evaluated strategic alternatives that led to the sale of the Brainspace business to focus on its core cybersecurity business which provided the liquidity to satisfy a substantial amount of the outstanding Promissory Notes. As a result, on February 8, 2021, we received $118.2 million from Appgate as repayment of the full then outstanding balance of $154.3 million on the Promissory Notes, including accrued interest. The $118.2 million was attributed to $1.1 million of 2020 accrued interest related to certain Promissory Notes, $19.4 million was attributable to the Promissory Notes issued in 2020 and the remaining balance of $97.7 million related to the recovery of a portion of Promissory Notes outstanding as of December 31, 2019. On the same date, we issued a payoff letter to Appgate, which resulted in the full settlement and extinguishment of all the Promissory Notes, including the remaining $36.1 million of principal and accrued interest. Accordingly, our results of operations for the year ended December 31, 2020 reflect a net reversal of the previously recorded allowance for loan losses of $97.7 million.
Loss on Asset Sales
We did not have a loss on sale of assets for the year ended December 31, 2020. Our loss on asset sales was $6.1 million for the year ended December 31, 2019, driven by the sale of our operations in Hong Kong, which resulted in a loss of $3.1 million, and the sale of equipment for a loss of $3 million.
Interest Expense, Net
Interest expense, net increased to $169.4 million for the year ended December 31, 2020 from $152.7 million for the year ended December 31, 2019, primarily attributable to higher expenses related to increased borrowings on our Revolving Facility. During the year ended December 31, 2020, we borrowed an additional $90.6 million, net under the Revolving Facility, which was used primarily to finance capital expenditures of $83.2 million during the year, as well as other operating expenses.
Other Expenses, Net
Other expenses, net decreased to $0.3 million for the year ended December 31, 2020 from $0.9 million for the year ended December 31, 2019, primarily driven by net income recognized under the transition services agreement with Appgate, which was spun-off through a distribution to our shareholders on December 31, 2019 and reflected as a discontinued operation.
Income Tax (Expense) Benefit
During the year ended December 31, 2020, we recorded an income tax expense of $3.5 million compared to an income tax benefit of $85.9 million for the year ended December 31, 2019. The effective tax rate for the year ended December 31, 2020 was (2.9)% compared to 22.6% for the year ended December 31, 2019. During the year ended December 31, 2020, the effective tax rate was lower primarily due to the valuation allowance recorded on certain deferred tax assets which are not more-likely-than-not to be realized. The changes in valuation allowance are primarily due to certain U.S. and Foreign tax assets that management believes are not more-likely-than-not to be fully realized in future periods. In addition, certain state NOL carryforward assets are reduced by a valuation allowance and/or are subject to an annual limitation under Internal Revenue Code Section 382.
13