Millions of Brits overspend at Christmas, leaving them in financial difficulty come the New Year.

In fact, a whopping 7.9 million people in the UK will struggle to pay their bills this month after an excessive festive period, according to the debt charity Money Advice Trust (MAT).

Severe debt isn’t just a financial problem either. The stress of owing money can lead to mental health issues and relationship breakdowns, according to charity Mind.

If your new year’s resolution is to be better with money in 2018, Money Saving Expert Martin Lewis can help you alleviate your debt.

The 45-year-old has already revealed the best bank accounts for interest rates on savings, but in his most recent Money Tips newsletter he revealed some key tips for cutting the cost of debt this year.

Here are five simple steps to help you pay off your debt quicker:

1. Stop borrowing money

It can be easy to get into a downward spiral with debt, but you need to stop borrowing money.

Only pay back what you can afford each month or you’ll make the situation worse in the long-run.

1. Identify which debts need paying off first

Start paying off the debts with the highest interest rates first.

"Use all spare cash to clear it and just pay the minimum on everything else. Once it's clear, focus on the next costliest,” said Martin.

1. Cut credit card costs

If you’re currently paying interest on your credit card look for a better option. You will have to pay a fee to transfer the debt, but it will be cheaper than paying the interest in the long-run.

Martin recommends swapping to either a Barclaycard or MBNA card to get the longest 0% interest period.

Barclaycard

Offers 38 months with 0% interest and they offer a low fee to shift your debt.

MBNA

They also offer a 38-month 0% periods, but a slightly higher fee to transfer your debt.

Cut overdraft costs to 0% (and make some extra cash doing it)

Martin reveals two key options when it comes to cutting your overdraft payments:

• Switch to a 0% overdraft

First Direct offer a 0% overdraft of up to £250 and they also give you £125 to switch to the account.

Nationwide Flexdirect 0% overdraft is much bigger, but depends on your credit score. It only lasts a year, so you’d need to have it payed off by then or consider swapping again.

If you've a friend who already has a nationwide account, you both get £100 if you switch, via their recommend a friend scheme.

• Use a 0% money transfer card

A few specialist cards also allow money transfers.

“This is where the card pays cash directly into your bank account, thus clearing your overdraft, so you owe it instead, at up to 37 months 0% - very useful for larger overdrafts,” Martin explains.

1. Cut big personal loans to 2.9%

If you’re clever about it, you can get a new cheaper loan to pay your old, more expensive one off.

On his website, Martin offers up this useful four-step process to find out if you could save money on your existing loan:

STEP 1: Ask your current lender for a settlement figure. This is how much it'll cost to repay your loan in full now including early repayment costs (i.e., the amount you'd need a new loan for to pay off your old one).

STEP 2: Work out how much it'll cost you to stay where you are. Check what your monthly repayments are and how many you have left (ask the lender if you don't know). Then multiply the two to see how much it'll cost you if you stick.

STEP 3: Find the cheapest new loan for the settlement figure. For borrowing under £3,000, the cheapest route is likely to be doing a money transfer (see above). Above that, a cheap loan wins. Use our free Loans Eligibility Calc to see your likely cheapest deal. Yet remember; with loans, only 51% of accepted customers need get the advertised rate.

STEP 4: Find out which is cheaper. Use the MSE Loan Switching Calculator to see whether you should stick or not.

Cut store card costs

Store cards are basically just credit cards, but a lot of them have much higher interest rates.

For example New Look's is 28.9% APR and Argos’ is 29.9%. You can transfer the balance on these to a better credit card too.

1. What about student loan?

Martin suggests leaving your student loan while you get your other finances sorted. He said: “While it's counter-intuitive, you're actually better off just to leave it.”

One in three American adults has nothing saved for retirement — here's how to change that.

Would you rather have one marshmallow now — or two marshmallows later? It's an iconic scenario made famous by psychologist Walter Mischel, the administrator of the 1960s "marshmallow test" measuring self-control and instant gratification. Most people go for the here and now. Swap out marshmallows with money, and you've got an all-too-common problem for the modern-day: People everywhere feel behind on saving for retirement. In fact, one in three American adults has nothing at all socked away, according to a survey by GOBankingRates. If that hits close to home, never fear. We've laid out some of the biggest obstacles we put in our own way when it comes to retirement saving — plus, how to get past them.

Obstacle: Being too optimistic about the future

Why we do it: It's an ego thing. We tend to think we're different; we're special and that nothing bad will ever happen to us, say Dr. Daniel Crosby, psychologist and president of Nocturne Capital. For example, we're more likely to entertain the idea we'll win the lottery than to think about our chances of divorce, cancer and other negative possibilities. This type of confidence can benefit us in some areas of life, but when it comes to finance — especially long-term savings — it can hurt us in the long run. Many people who are behind on savings think they'll make up for it by working forever, but unexpected events and health concerns can put a wrench in those plans. In a survey by Prudential Retirement of over 20,000 401(k) plan participants, 22 percent said "optimism bias" was their greatest challenge when it comes to retirement savings.

The fix: Aim to compartmentalize your rosy outlook. This type of confidence can insulate your feelings of self-worth and make you happier, but "know it has no place in investing," says Crosby. Block out some time on your calendar to do a "retirement reality check," says Snezana Zlatar, a senior vice president at Prudential Retirement. Use a retirement calculator like this one to see where you stand realistically, and then adjust your savings plan based on the results. And if you don't have a savings plan? It's not too late to make one to get your savings closer to where you'd like them to be. Take full advantage of your workplace retirement plan and any available matching dollars, and automate savings to come directly out of each paycheck. If you don't have a workplace plan, mimic one by automating contributions into an IRA.

Obstacle: Letting emotions reign over your financial decisions

Why we do it: Whether we like it or not, there's an emotional component to every decision we make. That's why research shows that people with serious injuries to the emotional centers of their brain can't make certain decisions, such as which tie to wear or what to have for breakfast in the morning. The kicker: Since fear doesn't affect their decisions, they tend to beat neurotypical people in investment tasks. The lesson here: "None of us should be suckered into thinking we aren't emotional about money — because we absolutely are," says Crosby. The key is to know how to use those emotions to your advantage.

The fix: Instead of letting an emotion like fear or insecurity keep you out of the stock market, flip the switch and use them to keep you aligned with your long-term goals. Research shows that low-income savers who looked at a photo of their children before making a big financial decision saved over 200 percent more than those who didn't. Or, consider values-based investing — putting your money in investments that support causes you believe in — to help you stay the course.(You're less likely to pull money away from funding something you really care about.) And if you're still worried about the markets? Take a quiz to determine your risk tolerance, and then get started with the asset allocation that's right for you. (Many investing platforms offer risk tolerance questionnaires — here are two from Vanguard and Charles Schwab.) "For the average American investor, the risk is not that they're going to lose 25 percent or 30 percent in the stock market," says Crosby. "The risk is that they're not going to compound it fast enough to get to where they want to go."

Obstacle: Procrastinating on saving

Why we do it: In Prudential's survey, 26 percent of respondents said procrastination was their biggest savings challenge. The idea that our brains are wired for short-term thinking plays a big part in this. Humans are about 2.5 times as upset about a loss as we are pleased by a comparably sized gain, says Crosby, and it can be difficult to imagine a gain so far in the future. Plus, the idea of compound interest — and how much of an impact it can have on our bottom lines — can be hard to wrap our minds around.

Good Cents

The fix: Think about what you specifically want your own retirement to look like. Then, in your mind, replace the vague idea of "retirement" with something concrete, like a beach house with a view of the bay, traveling with your partner or having more free time to spend with your family. Every time you think about retirement, picture your goal. Even better, look at it every day on a vision board, whether online (on Pinterest, for example) or on your wall. And if you need to give yourself a serious reality check to get moving? "Get educated about how much of a difference a few years' delay might have on your ability to retire on your own terms," says Zlatar. Play around with a compound interest calculator like this one to see how much you could gain in the long term by starting to save sooner rather than later.

Many of us enter January financially stretched. Lots of people overspend at Christmas and those paid monthly have to wait five weeks to be paid. Here are some tips for tackling your finances in 2018:

1. Draw up a monthly budget. You need to include all your income and expenses, and try your best to stick to it.

If you can manage to put some money into savings each month, then that's even better.

1. If you have long-standing credit card debt that you are finding hard to shift, think about switching to a card with a 0pc balance transfer offer, making sure to pay the balance off within the interest-free period.

It is little use having a savings account if you are also paying off credit card debt at a rate of 22pc.

1. Ensure you are not paying more than you need to for your household essentials. If you have not switched your energy, broadband or phone plan in some time, make it one of your new year's resolutions to do this.

You will be amazed at the savings you can make, with some switches taking no more than a half-hour phone call. Switching energy alone could save you up to €335, while savings of up to €432 are available on some broadband packages, according to Switcher.ie.

1. Take time to review all of your monthly payments. This should include fees being paid to the gym, a cinema membership, or a streaming service. And cancel any you no longer use.

You might be surprised at the monthly membership fee that is still going out of your account for a member of your family, or yourself, but the service is no longer being availed of.

1. Make the most of any tax reliefs or benefits you are entitled to by checking the Revenue.ie site. You can claim tax relief on some medical expenses that are not covered by the State or by private health insurance.

There's loads of information on benefits and taxes on the Revenue website, so take some time to check these out. Up to a third of eligible taxpayers are unaware they can get sizeable tax reliefs to offset some of the cost of nursing home fees, home-care costs and medical expenses. Tax relief at 40pc is available for those funding nursing home fees.

Tax relief is also available for expenditure incurred by an individual for themselves or family members which have not been fully reimbursed by a private health insurer or local authority. Relief is granted at the 20pc rate.

1. Take some energy-saving measures around the home.

Simple changes, like turning down the heating by just one degree, can knock up to 10pc off heating bills, while turning appliances off, rather than leaving them on standby, will reduce the appliance's energy use by around 20pc.

1. See if you can get a discount by switching from monthly to annual payments. The chances are you are paying extra for the convenience of paying things like gym membership or insurance on a monthly basis.

Although paying upfront will be larger outlays of cash in one go, it will save you in the long run.

1. See if you are eligible for fee-free banking.

Although many banks have reintroduced fees on current accounts in recent years, many still have accounts that offer fee-free banking once you meet certain criteria.

This may involve keeping a certain amount of money in the current account at all stages, or you may be entitled to fee-free banking because of your age.

Whenever things are going really well — as is the case right now on Wall Street and probably in your retirement portfolio — it's only natural to want to leave things be. Why try to fix what's not broken? But even the most patient buy-and-hold investors understand that you must revisit your strategy from time to time to make sure things are unfolding as you originally envisioned. The end of the year, when your thoughts are naturally focused on family, the coming year, and to-do lists, is a perfect time to do just that. To make this process easier, MONEY has put together a checklist of seven important steps to take now before the year ends to set your investment portfolio up for 2018 and beyond.

1. Remember to give yourself a raise.

Chances are, you got a slight bump in pay this year—perhaps a modest cost-of-living adjustment or a merit raise. Average pay for American workers rose a little over 2% over the past 12 months.

If you can, boost your 401(k) savings rate by that amount in the New Year.

The beauty of an employer-sponsored 401(k)—especially one where you're automatically enrolled—is that inertia works for you. You don't have to keep remembering to sock away money into your retirement account. Your company automatically does that for you with each paycheck.

But inertia cuts both ways. If you simply stay the course and fail to raise your contribution rate periodically, you're leaving money on the table. That's because over time, being an aggressive saver and mediocre investor beats being a good investor with just average saving habits.

Case in point: A 35-year-old making $75,000 a year, putting 7% of pay in a 401(k) and earning a better-than-average 10% annual return would have nearly $1.2 million after 30 years. That same worker who socks away the recommended 15% of pay while earning more-typical 7% annual gains winds up with $1.4 million. "Your goal should be maxing out your retirement contributions. If you can't do it all at once, adjust your savings rate gradually over time," says Jan Blakeley Holman, director of adviser education at Thornburg Investment Management.

And if you're 50 or older, remember to play catch-up. The IRS allows older workers to stuff an added $6,000 into their 401(k) s. The 2018 cap for workers under 50 is $18,500.

Case in point: A 35-year-old making $75,000 a year, putting 7% of pay in a 401(k) and earning a better-than-average 10% annual return would have nearly $1.2 million after 30 years. That same worker who socks away the recommended 15% of pay while earning more-typical 7% annual gains winds up with $1.4 million. "Your goal should be maxing out your retirement contributions. If you can't do it all at once, adjust your savings rate gradually over time," says Jan Blakeley Holman, director of adviser education at Thornburg Investment Management.

And if you're 50 or older, remember to play catch-up. The IRS allows older workers to stuff an added $6,000 into their 401(k)s. The 2018 cap for workers under 50 is $18,500.

1. Fix your mix of stocks and bonds.

"We're entering the ninth year of a bull market, and we've hit more than 45 new highs just this year alone," says Francis Kinniry, a principal in Vanguard's investment strategy group. "Chances are, rebalancing will be an issue."

So take care of it now, to set your portfolio up for success in the coming year.

If you started out with a moderate 60% stock/40% bond portfolio five years ago—and neglected to routinely reset that mix back to your original strategy—your portfolio would have drifted into a far more aggressive 75% equity/25% fixed-income strategy. That may seem harmless, but in the event of a market downturn, having 75% of your nest egg in stocks will lead to far greater losses than a moderate 60% equity stake.

Research shows it actually makes little difference when you rebalance—at year-end, on your birthday, or whenever your allocation drifts slightly. So now is just as good a time any.

But if you are resetting your allocation, remember "that the best way to rebalance is the most tax-efficient way," says Kinniry.

Before you start selling your winning investments—which will trigger a tax bill—start by redirecting new contributions for the following year into lagging investments. In other words, since your stocks have been outperforming your bonds by a wide margin, use most of your new contributions to pad your fixed-income exposure. Also, rather than reinvesting dividends and gains back into the same funds; use those distributions to add to your weakest-performing asset class.

1. Maximize your other tax shelters.

As you "top off" the contributions you're making to your 401(k), don't forget to fund all your other tax-sheltered investment accounts that often get overlooked.

Start with your IRAs. While most Americans with income have access to at least one type of individual retirement account—a traditional IRA, a Roth, a spousal IRA, or even a nondeductible account—only 33% of Americans currently contribute to these accounts. You can save up to $5,500 in 2018 or $6,500 if you're 50 or older.

Though you have until April 15, 2019, to make your 2018 IRA contribution, don't delay. By immediately contributing when you're eligible on Jan. 1, you'll maximize the impact of that tax-deferral.

In addition to IRAs, don't overlook health savings accounts. "HSAs are kind of a stealth retirement savings vehicle," says Rob Williams, director of income planning for the Schwab Center for Financial Research. That's because HSAs are triple tax advantaged: Money goes in tax deferred, grows tax sheltered, and, if withdrawn for qualified medical expenses, comes out tax-free.

You're likely to have plenty of those costs in retirement, which, if not addressed, can eat into your nest egg. A recent Fidelity analysis found that a typical 65-year-old couple retiring this year can expect to spend $275,000 in health-related expenses throughout the course of their retirement.

To qualify, you have to be covered by a high-deductible health plan. In 2018 the maximum contribution for an eligible individual is $3,450. For families, it's $6,900. As with other tax-deferred accounts, it's important to max out if you can, yet only 15% of HSA users actually do.

1. Make sure your hatches are battened down.

Diversification serves many purposes. In addition to ensuring that some of your money is held in assets that outperform when times are good, you're also making sure that you have some exposure at all times to investments that are likely to hold up in a market storm.

But how sure are you that you have enough defensive investments heading into the New Year?

"Everyone should look at their accounts now and make sure they have some ballast," says financial planner Lewis Altfest.

What steps should you take? After a spectacular year for equities in 2017—with the Dow Jones industrial average up more than 20%—now's the time to "trim some of the high-flying stocks with high P/Es," he says, referring to companies sporting lofty price/earnings ratios. That's because in a market downturn, stocks with high P/E ratios tend to fall more.

Altfest says you can replace those holdings with exposure to defensive stocks, such as shares of consumer-staples companies that make things people need, not want, like toothpaste and soap. You can also look to economically insensitive companies such as drug makers that aren't reliant on a robust economy to thrive.

And if you're worried about market turmoil in the coming year, now is a good time to trim some of your holdings in non-investment-grade "junk" bonds. This is debt issued by companies with less-than-pristine balance sheets and financials.

Because of that risk, junk bonds have historically acted more like stocks than bonds. In 2008, for instance, the typical junk-bond fund lost nearly 30% of its value, according to Morningstar, which was on par with the 37% decline for the S&P 500 index of blue-chip stocks.

1. Make your wish list.

If the goal of investing is to buy low and sell high, at some point you have to commit to investing in assets that are beaten down or unloved. Alas, after nearly nine years of rallying, stocks are pretty expensive across the board.

But just as you put together a Christmas shopping list well before the holidays, investors ought to list the stocks they'd like to own before the next downturn comes around so they'll know what to buy once the price is right. Among highly profitable companies that will trade at single-digit price/earnings ratios if their shares fall by a third (which is typical in a bear market): Apple (ticker: AAPL), Intel (INTC), HP (HPQ), and Applied Materials (AMAT).

Meanwhile, as you wait for buying opportunities to open up after a downturn, you can start putting new money to work now in the one place that's relatively cheap: foreign stocks.

"We have a significant position—40% if you X-ray our funds—in international securities," says Altfest. "They're all cheaper than the U.S.," he says, adding that not only is Europe growing faster than the U.S. now, many foreign economies, including the emerging markets, aren't as far along in their recoveries as is America.

In our MONEY 50 recommended list, you can go with Vanguard Total International Stock Index (VGTSX) for broad exposure or T. Rowe Price Emerging Markets Stock (PRMSX), focusing on the fast-growing emerging markets, which trade at a P/E ratio half that of the U.S.

1. Harvest your tax losses.

Admit it: You hate it when the government takes a cut of your profits every time you sell any investment that has gone up in price. But you can get Uncle Sam back by making him share your pain when you sell investments that have lost value. It's called tax-loss harvesting, and "now's the time to be looking at that strategically," says Schwab's Williams.

Isn't selling at a loss admitting defeat? It doesn't have to be. When you sell a stock or fund at a loss, you are realizing the loss for tax purposes. And you can use that loss to reduce your taxes—by offsetting gains elsewhere in your portfolio or reducing ordinary income up to $3,000.

But you can turn around and reinvest in the same type of asset, as long as it's not "substantially identical." Or wait 30 days and step back into the exact same investment.

1. Check your automated settings.

When in doubt, put it on autopilot. In most situations, that's wise financial advice. "There's a huge benefit to having your accounts automated, so that contributions are automatically deducted into your 401(k) and invested for you without requiring you to think about it," says Holman.

It goes well beyond putting money into a 401(k), though. Automation now allows for savings rates to be increased over time, or for your portfolio to be rebalanced at periodic intervals, or even for tax losses to be realized.

Still, "you need to check on your autopilots annually to see what's being deducted and how it's being invested," says Holman.

Start by making sure your 401(k) contribution increases aren't too conservative. Many plans allow for savings rates to rise by one or two percentage points a year. If you can afford more, override the autopilot to put your portfolio on a faster path. Also, make sure the stock-and-bond mix that you are being automatically rebalanced into is still appropriate for you. Chances are, you set up your allocation strategy several years ago and may have forgotten about it. But as the end of the year should remind you, time marches on quickly. And things change.

Retirement security is a holy grail that many investors chase. A recent AARP survey revealed that 74 percent of private sector workers are anxious about having enough money to live comfortably in retirement.

Although increasing savings may seem like the answer, creating a sustainable retirement strategy is a bit more complex. Investors must also plan for costs that can detract from their portfolio's growth. "Taxes, long-term care and inflation all have the potential to eat away at your retirement savings," says Marcy Keckler, vice president of financial advice strategy at Ameriprise Financial in the greater Minneapolis-St. Paul area. "Not planning properly could result in a substantial blow to your portfolio from a sudden need for extended care, or inflation could slowly chip away at your nest egg."

Health care may be the biggest threat. Long-term care poses two problems for retirees. First, the cost can be staggering. Genworth Financial puts the average annual cost of nursing care in a semi-private room at $85,775. Assuming a typical two-and-a-half-year stay, the total bill for end-of-life care easily surpasses $200,000. The second issue is that these expenses don't fall under the Medicare coverage umbrella. Medicaid will pay for long-term care but requires seniors to spend down their assets to qualify.

Long-term care has the potential to be the most devastating to an investor's retirement strategy, says Steven Yager, a financial advisor with Yager & Associates in Northville, Michigan. The root problem is longevity. "People often assume that since their parents or grandparents lived to a certain age, they'll live to a similar age. They then base their retirement plan on this uneducated assumption about their own life expectancy."

Health care can encroach on your retirement security when expectations don't match reality. There are two possible solutions: Self-fund these expenses or invest in long-term care insurance. Self-funding may require you to increase your current savings rate or rethink your overall strategy. For example, you may need to maintain a larger share of stocks to generate growth in your investments for a longer period if you're trying to fill a long-term care funding gap.

Long-term care insurance can cover health care costs while leaving your portfolio intact, but because of their high premiums, these policies may suit some investors better than others. "It comes down to your asset base," says Jason Laux, vice president of Synergy Group in White Oak, Pennsylvania. "For people without a lot of assets, long-term care insurance usually isn't appropriate. For those who are wealthy, it may make more sense to be growing and investing your money."

Investors in the middle, with assets ranging from $350,000 to $1 million, could benefit most from a long-term care policy. Although these investors may not have enough wealth to self-fund, they can afford the higher premiums to avoid the Medicaid spend-down requirement.

Protection from higher prices comes at a cost. Inflation can be detrimental to retirement savings. Research from insurance consultancy LIMRA suggests that a retirement portfolio could lose more than $73,000 in purchasing power from a 2 percent inflation rate. The effects of inflation may be compounded when increases in certain expenses – such as health care – outpace rising prices in general.

Including inflation-hedging investments in your retirement plan offers a measure of protection for your portfolio. Annuities and Treasury inflation-protected securities are two options for taming inflation's effects.

Annuities are designed to provide tax-deferred growth and generate a guaranteed stream of income, which can supplement income from tax-advantaged retirement accounts, taxable investments or Social Security benefits. With TIPS, the principal value of the investment adjusts up or down in tandem with changes in the consumer price index. These investments yield lower returns compared to stocks, but they can be useful by shielding investors against the negative effects of inflation.

While both annuities and TIPS can benefit investors in retirement, there are some downsides to consider, says Joy Kenefick, managing director of investments with Wells Fargo Advisors in Charlotte, North Carolina. Annuities can offer guaranteed income or guaranteed protection in volatile or declining markets, but the expenses, complexity and lack of liquidity may make them a less than perfect fit for your investment needs.

TIPs, by comparison, offer modest returns in exchange for protection against market volatility and inflation. The benefit they offer comes at the cost of performance and growth, Kenefick says. Before buying into either one, assess the value and purpose of these investments for your retirement strategy.

Diversification should address this overlooked risk. Many investors diversify their assets for risk but not for taxes, Laux says. "They funnel the majority of their investments into pre-tax accounts and are told they'll be in a lower tax bracket when they retire but often don't find that to be true." Without tax diversification, he says, you could end up paying the maximum taxes on all your retirement assets.

Creating tax diversification begins with knowing what you've invested in and where those investments are held. Tax-inefficient investments, such as bonds, belong in tax-deferred accounts, while tax-efficient vehicles, like stock index funds, should be held in taxable accounts. Growth stocks can be used in a 401(k) or similar account to capitalize on the compounding benefit of tax deferral, says Melinda Kibler, a certified financial planner with Palisades Hudson Financial Group in Fort Lauderdale, Florida.

Minimizing the tax bite on your investments becomes even more important when you begin withdrawing money from those accounts. "The way in which an investor harvests from their portfolio is more consequential than the way one saves," Kenefick says. Investors should tap non-qualified accounts first, she says, leaving tax-sheltered accounts to compound and avoid "the eroding effects of paying taxes for as long as possible."

Calculating your target withdrawal rate accurately also matters. Daniel Prince, head of product consulting for BlackRock's iShares U.S. wealth advisory business, says an optimal withdrawal strategy requires retirees to be accurate on both sides of the ledger. Retirees should be realistic about their income and assets, and balance that against their spending. "Taxes will always be a cost," Prince says, but between long-term care and inflation, it's the easiest of the three to proactively reduce.