Parents tend to splurge on their children during the holidays.

This year, 63% of millennials, many of whom now have school-age children of their own, said they plan to spend the same or more on holiday shopping as they did last year — the highest share of any generation, according to a quarterly report by TransUnion.

Millennials are also more likely to say their income went up over the last few months and that they expect their earnings potential to increase again in the year ahead. TransUnion polled 3,000 adults in October.

“I see a lot of optimism going into the holiday season,” said Charlie Wise, TransUnion’s senior vice president and head of global research and consulting.

For many in this group, recent wage gains have outpaced rising prices and, although the broader unemployment rate has ticked higher, “we are still seeing a steady employment situation,” Wise said. “When people have jobs, that confidence is going to translate into spending.”

More from Personal Finance:
Thanksgiving meals are expected to be cheaper in 2024
How Trump’s win could change your health care
Remote work is helping Americans take longer trips

“It’s clear that millennials will play the largest role this holiday shopping season with the greatest expected spend,” Wise said.

Holiday spending between Nov. 1 and Dec. 31 is forecast to increase to a record total of $979.5 billion to $989 billion, according to the National Retail Federation.

Even as credit card debt tops $1.17 trillion, holiday shoppers expect to spend, on average, $1,778, up 8% compared with last year, Deloitte’s holiday retail survey found.

Meanwhile, 28% of holiday shoppers surveyed in September said they still had not paid off the gifts they purchased for their loved ones last year, according to a holiday spending report by NerdWallet, which polled more than 1,700 adults.  

Buy now, pay later is one of the fastest-growing categories in consumer finance and is expected to become more popular in the weeks ahead, according to the most recent data from Adobe. Adobe forecasts buy now, pay later spending will peak on Cyber Monday with a new single-day record of $993 million.

However, managing multiple buy now, pay later loans with different payment dates may make it more likely for consumers to get in over their heads, some experts have cautioned — even more than with credit cards, which are simpler to account for, despite sky-high interest rates.

Sometimes, the option to pay in installments can make financial sense, especially at 0% interest, according to Marshall Lux, a senior fellow at the Mossavar-Rahmani Center for Business and Government at the Harvard Kennedy School.

“If used properly, it’s great,” Lux said.

“But a lot of people are going to spread out purchases over a longer period of time and then you get into high interest and a cycle of debt,” he said.

The more buy now, pay later accounts consumers have open at once, the more prone they become to overspending, missed or late payments and poor credit history, other research shows.

If a consumer misses a payment, there could be late fees, deferred interest or other penalties, depending on the lender. In some cases, those interest rates can be as high as 30%, rivaling the highest credit card charges. 

Subscribe to CNBC on YouTube.

As some Americans struggle to save for retirement, key 401(k) plan changes could soon make preparing easier for certain workers, experts say. 

Enacted by Congress in 2022, “Secure 2.0” ushered in sweeping changes to the U.S. retirement system, including several updates to 401(k) plans. Some of these provisions will go into effect in 2025.

Meanwhile, roughly 4 in 10 American workers say they are behind in retirement planning and savings, primarily due to debt, not enough income or getting a late start, according to a CNBC survey, which polled about 6,700 adults in early August.

Dave Stinnett, Vanguard’s head of strategic retirement consulting, said 401(k) plans are “the primary way most Americans prepare for retirement” and those accounts can work “very, very well” when designed properly.

Here are some key changes for 2025 and what employees need to know.

For 2025, employees can defer $23,500 into 401(k) plans, up from $23,000 in 2024. Workers ages 50 and older can make up to $7,500 in catch-up contributions on top of the $23,500 limit.

But there’s an “exciting change” to catch-up contributions for a subset of older workers in 2025, thanks to Secure 2.0, according to certified financial planner Jamie Bosse, senior advisor at CGN Advisors in Manhattan, Kansas.

Starting in 2025, the catch-up contribution limit will jump to $11,250, about a 14% increase, for employees ages 60 to 63. Including the $23,500 limit, these workers can save a total of $34,750 in 2025.

Only 14% of employees maxed out 401(k) plans in 2023, according to Vanguard’s 2024 How America Saves report, based on data from 1,500 qualified plans and nearly 5 million participants.

On top of maxing out contributions, an estimated 15% of workers made catch-up contributions in plans that allowed it during 2023, the same report found.

Secure 2.0 has also boosted access to 401(k) and 403(b) plans for certain part-time workers.

Starting in 2024, employers were required to extend plan access to part-time employees who worked at least 500 hours annually for three consecutive years. That threshold drops to two consecutive years in 2025.

“That’s a very good thing for long-term part-time workers” who may have struggled to qualify for 401(k) eligibility, said Stinnett.

In March 2023, some 73% of civilian workers had access to workplace retirement benefits, and 56% of workers participated in these plans, according to the U.S. Bureau of Labor Statistics.

“Coverage is my thing,” said Alicia Munnell, director of the Center for Retirement Research at Boston College.

“It’s important that people have coverage no matter where they go,” including from full-time to part-time at the same job, she added.

Automatic enrollment and escalation — gradually increasing the contribution rate annually — are key plan designs to boost savings, Stinnett previously told CNBC.

But those features still may not result in employees saving enough. While experts recommend a 15% savings rate, most plans set a cap on automatic escalation. In 2022, 63% limited automated contributions to 10% or less of annual pay, according to the Plan Sponsor Council of America.

Many large U.S. companies have seen their stocks swell since the presidential election.

The top 10 performing stocks in the S&P 500 index saw returns of 18% or more since Election Day, according to data provided by S&P Global Market Intelligence, which analyzed returns based on closing prices from Nov. 5 to Nov. 20.

Two companies — Axon Enterprise (AXON), which provides law-enforcement technology, and Tesla (TSLA), the electric-vehicle maker led by Elon Musk, an advisor to President-elect Donald Trump — saw their stocks gain more than 35%, according to S&P Global Market Intelligence.

By contrast, the S&P 500 gained about 2% over the same period.

Investors should be cautious about buying individual stocks based on short-term boosts, said Jeremy Goldberg, a certified financial planner, portfolio manager and research analyst at Professional Advisory Services, Inc., which ranked No. 37 on CNBC’s annual Financial Advisor 100 list.

“It’s usually a bad idea,” Goldberg said. “Momentum is a powerful force in the market, but relying solely on short-term price moves as an investment strategy is risky.”

Investors should understand what’s driving the movement and whether the factors pushing up a stock price are sustainable, Goldberg said.

Companies in the streaming ecosystem — like Warner Bros. Discovery (WBD), which owns the Max streaming service, and Disney+ owner The Walt Disney Co. (DIS) — may be benefactors of looser rules around consolidation, they said.

For example, Palantir Technologies (PLTR), cited “unprecedented” demand for its AI platform in the third quarter, helping deliver “exceptionally strong” earnings, Treasurer and CFO David Glazer told investors Nov. 4.

Likewise, Axon beat analysts’ estimates in its Nov. 7 earnings results, with officials touting its “AI era plan” and raising earnings guidance, Goldberg said.

Axon and Palantir stocks were up 38% and 22%, respectively, from Nov. 5 to Nov. 20, according to S&P Global Market Intelligence.

Some companies benefited from a combination of policy and earnings, experts said.

Take Vistra Corp. (VST), an energy provider, for example. The company’s stock jumped 27% after Election Day.

Vistra is in talks with large data centers — or “hyperscalers” — in Texas, Pennsylvania and Ohio to build or upgrade gas and nuclear plants, Stacey Doré, Vistra’s chief strategy and sustainability officer, said on the company’s Q3 earnings call Nov. 7.

Tech companies are building more and more such data centers to fuel the AI revolution — and need to source increasing amounts of energy to run them.

Musk, Tesla’s CEO, was one of Trump’s top campaign backers. Trump tapped him to co-lead a new Department of Government Efficiency. Shares of the electric-vehicle maker soared 14% the day after the election and almost 30% by week’s end.

But Tesla stock has additional tailwinds, experts said.

For one, Trump wants to end a $7,500 federal tax credit for EVs. Scrapping that policy is expected to hurt Tesla’s EV rivals.

Tesla has also been developing technology for driverless vehicles. In Tesla’s recent earnings call, Musk said he’d use his influence in Trump’s administration to establish a “federal approval process for autonomous vehicles.”