Jessica Fischer
Chief Financial Officer at Charter Communications
Thanks, Chris. Let's turn to our customer results on Slide 6. Including residential and SMB, we lost 61,000 Internet customers in the fourth quarter, while video customers declined by 257,000. In mobile, we added 546,000 mobile lines, and wireline voice customers declined by 251,000. Our Spectrum One product continued to perform well. Customers that signed up for our Spectrum One product in the fourth quarter of 2022 reached their 12-month anniversary this past quarter.
Those promotional roll-offs didn't drive incremental Internet churn. In the quarter, we had slightly lower mobile line gross adds year-over-year tied to Internet gross additions with a lower churn rate year-over-year and flat sequentially. We continue to see healthy data usage at our Spectrum One promotional lines and remain confident that these lines will perform well as long-term customers.
Turning to rural; we ended the year with 420,000 subsidized rural passings and grew those passings by 295,000 in 2023, in-line with our target, and by 105,000 in the fourth quarter alone, an acceleration from this 78,000 we activated during the third quarter. Customer growth in our subsidized rural footprint also accelerated, with 34,000 net customer additions in the quarter.
As slide 13 shows, we're generating customer penetrations of close to 50% in cohorts that have reached or passed the 12-month mark. In 2024, we expect to activate approximately 450,000 new subsidized rural passings, about 50% more than in 2023, with seasonality in the first quarter tied to the winter weather. Slide 12 shows that so far, with additional state bids that we expect, we will have committed to build approximately 1.75 million subsidized rural passings. We also expect our RDOF build to be completed by end of 2026, two years ahead of schedule.
Moving to financial results, starting on slide 7; over the last year, residential customers declined by 0.3%, with video-only customer churn, partly offset by new customer growth driven by Internet. Residential revenue per customer relationship was up 0.1% year-over-year, given promotional rate step-ups, rate adjustments and the growth of Spectrum Mobile, mostly offset by a higher mix of non-video customers and growth of lower-priced video packages within our base.
As slide 7 shows, in total, residential revenue was flat year-over-year. Residential Internet ARPU grew by 2.2% year-over-year, but by 3.4% when excluding the impact of Spectrum One GAAP revenue allocation out of Internet into mobile. Turning to commercial, SMB revenue declined by 0.9% year-over-year, reflecting lower monthly SMB revenue per SMB customer, primarily due to a higher mix of lower-priced video packages and a lower number of voice lines per SMB customer. These factors were partly offset by SMB customer growth of 0.7% year-over-year.
Enterprise revenue grew 3.8% year-over-year, driven by enterprise PSU growth of 6.5% year-over-year. Excluding all wholesale revenue, enterprise revenue grew by 6.1%. Fourth quarter advertising revenue declined by 23.4% or $130 million year-over-year due to less political revenue. Core ad revenue was down 0.7% year-over-year due to a more challenged advertising market, partly offset by our growing advanced advertising capabilities. Other revenue grew by 24.4% year-over-year, driven by higher mobile device sales. And in total, consolidated fourth quarter revenue was up 0.3% year-over-year and up 1.3% year-over-year when excluding advertising.
Moving to operating expenses and adjusted EBITDA on Slide 8. In the fourth quarter, total operating expenses declined by 0.7% year-over-year. Programming costs declined by 10.6% year-over-year due to a decline in video customers of 6.8% year-over-year and a higher mix of lighter video packages. These factors were partly offset by higher programming rates. For the full year 2024, we expect programming cost per video customer to grow in the 1% to 2% range year-over-year with our video package mix being the largest variable.
Other cost of revenue increased by 15%, primarily driven by higher mobile device sales and other mobile direct costs, partly offset by lower ad sales costs. Cost to service customers increased by 2.1% year-over-year, driven by additional activity to support the growth of Spectrum Mobile, partly offset by productivity improvements, including from 10-year investments, and lower service transactions per customer. Looking forward, I would note that our previous investments related to job structure, pay and benefits to build a more skilled and longer-tenured workforce are now largely complete and service transaction trends are back on trajectory after the programming dispute in September.
Sales and marketing costs declined by 1.6%, primarily driven by lower labor costs. Finally, other expenses grew by 1.5%, driven by labor costs. Adjusted EBITDA grew by 1.6% year-over-year in the quarter and by 3.6% when excluding advertising. Turning to net income on Slide 9, we generated $1.1 billion of net income attributable to Charter shareholders in the fourth quarter, down from $1.2 billion last year, driven by a pension remeasurement loss and higher interest expense, partly offset by a gain on the sale of towers and higher adjusted EBITDA.
Turning to Slide 10, capital expenditures totaled $2.9 billion in the fourth quarter, just below last year's fourth quarter spend. Line extension spend totaled $978 million, $50 million higher than last year, driven by our subsidized rural construction initiative and increased residential and commercial greenfields and market sell-in opportunities. Fourth quarter capital expenditures, excluding line extensions, totaled $1.9 billion compared to $2 billion in the fourth quarter of 2022, driven by lower spend on scalable infrastructure and lower spend on CPE due to purchase timing, partly offset by higher spend on upgrade/rebuild, primarily network evolution. For the full year 2023, we spent $11.1 billion.
Looking ahead at full year 2024, we expect capital expenditures to total between $12.2 billion and $12.4 billion, including line extensions of approximately $4.5 billion and network evolution spend of approximately $1.6 billion. On Slide 11, we've provided our current expectations for capital spending through the year 2027, excluding any possible line extension spend associated with the BEAD program. The slide divides our spending into three categories: line extensions, network evolution and core capex spend.
As the slide shows, we expect capex spend of just over $12 billion in 2024 to fall to approximately $8 billion by 2027. Our line extension capex includes spending for greenfield, market sell-in and serviceability builds from our legacy footprint, driving continued expansion of residential and commercial passings. In turn, our non-rural passings growth should continue to be robust and similar to 2023 growth, subject to the pace of overall housing growth. These passings are natural extensions or pocket fill-ins to our network and have a long track record of low cost per passing and reliable penetration trends to contribute to growth at attractive ROI.
We've not included the potential impact of BEAD in the passing figures on Slide 12 or in our capex outlook on Slide 11, given the regulatory and bidding uncertainty associated with the program. We don't expect any potential BEAD build subject to acceptable guidelines, as Chris mentioned, to begin until 2025. And similar to our peers and competitors, our success in BEAD will be an overlay to our capital expenditure outlook.
Turning to network evolution, where our long-term capital expenditures outlook remains essentially unchanged, we continue to expect to spend approximately $100 per passing to evolve our network to offer multi-gigabit speeds. Finally, core capital expenditures, which excludes line extensions and network evolution, has remained consistent as a percentage of revenue since 2021. And following the completion of our network evolution initiative, capital expenditures, excluding line extensions as a percentage of revenue, should decline below 2022 level, which has important long-term cash flow implications.
Turning to free cash flow on slide 14; free cash flow in the fourth quarter totaled $1.1 billion, a decrease of $75 million compared to last year. The decline was primarily driven by less favorable change in accrued expenses related to capital expenditures, partly offset by an increase in net cash flows from operating activities and a decrease in capital expenditures. Just a brief comment on cash taxes for 2024 before turning to the balance sheet. We currently expect our calendar year 2024 cash tax payments under current legislation to land between $1.5 billion and $1.9 billion, depending on a number of factors.
We finished the quarter with $97.6 billion in debt principle. In the first weeks of 2024, we redeemed all of our outstanding 2024 senior secured floating rate notes and paid in full all of our outstanding 2024 senior secured notes. So, we no longer have any significant debt maturities due in 2024. Our current run rate annualized cash interest is $5.2 billion. Given our long-dated and 86% fixed rate debt structure, our sensitivity to higher rates is relatively low. If we refinanced all of our debt in the next three years at current rates, the impact to our run rate interest expense would be less than $90 million or 2% of that run rate interest expense.
As of the end of the fourth quarter, our ratio of net debt to last 12-month adjusted EBITDA was 4.42 times, and we intend to stay at or just below the high end of our 4 times to 4.5 times target leverage range. During the quarter, we repurchased 3.2 million Charter shares and Charter Holdings common units totaling $1.3 billion at an average price of $419 per share. Before turning the call over to Q&A, I want to make a few comments regarding the Affordable Connectivity Program for Internet and mobile customers.
While we still hope the ACP program will be allocated additional funding, we're well aware that the program could end this spring, and we're designing programs to assist those that are on the ACP program. There is no doubt that the end of the program would be disruptive for many. Nonetheless, we will have the full benefit of our high-quality sales and retention force as well as our mobile product, which saves customers hundreds of dollars to preserve connections.
With the continued temporary impact from fixed wireless and the potential end of ACP, we may continue to face short-term customer growth headwinds as we enter 2024. Despite those short-term challenges, we are competing well and are focused on driving healthy EBITDA growth in 2024. A component of that has been to reflect inflation in our pricing while preserving value to our customers.
We're also actively managing expenses, and we believe we can do so without impacting our sales, service and broader growth initiatives. But most importantly, we remain focused on long term and a return to more normalized Internet growth. We have what we believe are the best products at the best prices in our industry and we remain underpenetrated relative to our long-term potential. Taking advantage of that opportunity is what will ultimately create the most shareholder value.
Operator, we're now ready for Q&A.