Interest expense. We incurred interest expense as follows (in thousands):
| | | | | | | | | | | | | |
| | Three Months Ended September 30, | | Nine Months Ended September 30, | |
| | 2023 | | 2022 | | 2023 | | 2022 | |
Interest expense on debt and finance lease obligation | | $ | 12,623 | | $ | 8,719 | | $ | 36,299 | | $ | 21,252 | |
Noncash interest on derivatives, net | | | (1,469) | | | (39) | | | (3,348) | | | (2,904) | |
Amortization of deferred financing costs | | | 740 | | | 589 | | | 1,960 | | | 1,940 | |
Total interest expense | | $ | 11,894 | | $ | 9,269 | | $ | 34,911 | | $ | 20,288 | |
Interest expense increased $2.6 million, or 28.3%, during the three months ended September 30, 2023 as compared to the three months ended September 30, 2022, and $14.6 million, or 72.1%, during the nine months ended September 30, 2023 as compared to the nine months ended September 30, 2022 as follows:
Interest expense on our debt and finance lease obligation increased $3.9 million and $15.0 million in the third quarter and first nine months of 2023, respectively, as compared to the same periods in 2022, primarily due to increased interest on our variable rate debt, our draw of the $225.0 million available under our third term loan agreement in May 2023 and the additional amounts borrowed under two of our term loans in July 2022. These increases were partially offset due to our repayment of the $220.0 million loan secured by the Hilton San Diego Bayfront in May 2023, partial repayments of the senior notes in February 2022, decreases in the interest rates on our senior notes due to our exiting the covenant relief period in March 2022, and decreased interest on our finance lease obligation due to our sale of the Hyatt Centric Chicago Magnificent Mile in February 2022.
Noncash changes in the fair market value of our derivatives caused interest expense to decrease $1.4 million and $0.4 million in the third quarter and first nine months of 2023, respectively, as compared to the same periods in 2022.
The amortization of deferred financing costs caused interest expense to increase $0.2 million and a nominal amount in the third quarter and first nine months of 2023, respectively, as compared to the same periods in 2022 due to costs incurred on our third term loan.
Our weighted average interest rate per annum, including our variable rate debt obligations, was approximately 5.8% and 4.4% at September 30, 2023 and 2022, respectively. Approximately 51.2% and 42.4% of our outstanding notes payable had fixed interest rates or had been swapped to fixed interest rates at September 30, 2023 and 2022, respectively.
Gain on sale of assets. Gain on sale of assets totaled zero for both the three and nine months ended September 30, 2023, and zero and $22.9 million for the three and nine months ended September 30, 2022, respectively. In the first quarter of 2022, we recognized an $11.3 million gain on the sale of the Hyatt Centric Chicago Magnificent Mile and an $11.6 million gain on the combined sale of the Embassy Suites Chicago and the Hilton Garden Inn Chicago Downtown/Magnificent Mile.
Gain (loss) on extinguishment of debt, net. Gain (loss) on extinguishment of debt, net totaled a nominal gain and a net loss of $0.8 million for the three months ended September 30, 2023 and 2022, respectively. During the third quarters of 2023 and 2022, we recognized nominal gains due to reassessments of the remaining Hilton Times Square potential employee-related obligations currently held in escrow. During the third quarter of 2022, we also recognized a loss of $0.8 million related to lender fees and the accelerated amortization of deferred financing costs associated with our July 2022 Amended Credit Agreement.
For the nine months ended September 30, 2023, gain (loss) on extinguishment of debt, net totaled a gain of $9.9 million as compared to a net loss of $1.0 million for the nine months ended September 30, 2022. During the first nine months of 2023, we recognized a gain of $9.9 million, comprised of $9.8 million from the relief of the majority of the Hilton Times Square potential employee-related obligations, with the funds released to us from escrow, and $0.1 million due to reassessments of the remaining potential employee-related obligations currently held in escrow. During the first nine months of 2022, we recognized a loss of $1.0 million related to lender fees and the accelerated amortization of deferred financing costs associated with our July 2022 Amended Credit Agreement and the February 2022 repayments of a portion of our senior notes. This loss was slightly offset by a nominal gain due to reassessments of the remaining Hilton Times Square potential employee-related obligations currently held in escrow.
Income tax (provision) benefit, net. We lease our hotels to the TRS Lessee and its subsidiaries, which are subject to federal and state income taxes. In addition, we and the Operating Partnership may also be subject to various state and local income taxes.
During the three and nine months ended September 30, 2023, we recognized current income tax provisions of $0.6 million and $1.8 million, respectively, resulting from current state and federal income tax expenses.