Living alone costs singletons an extra £250,000 over a lifetime compared to couples, it is claimed. So what is the "singles tax", asks Tom de Castella.

The illusion of single life being one long party has been shattered, was the bold claim.

Carrying the full burden of a mortgage, holidays and bills all adds up and single people spend more than £250,000 over the course of their life because they are not part of a couple, a new study suggests.

Researchers compared the spending of people living alone with couples, says price comparison website uSwitch, who commissioned the study. According to the findings single people are paying a hefty penalty for going it alone - hence the non-stop party illusion being shattered. But is it really true?

The cost of life as a single man Andy Sexton, a 40 year-old bank worker, lives alone in Chelmsford. He estimates that he pays an extra £1,500 a year for living on his own.

What angers him most is the unfairness of council tax. It costs him £100 a month with the single person rebate. In a couple it would work out at £67 a month per person. He also estimates he spends an extra £600 a year on bills.

He doesn't spend any extra on holidays as he never stays in single rooms. Instead if he can find a room with twin beds, he goes away with a friend.

Shopping is another area where he thinks he loses out because he buys smaller portions that are more expensive than family offers.

He says Tesco and M&S do a set meal for two with a bottle of wine for under £10, but they don't do offers like this for single people.

"Being single costs a lot and you're bloody miserable - that's what singles themselves say," says Ann Robinson from uSwitch. "Only 20% believe they've got the better deal than couples."

The biggest aspect of the "singles tax" is housing, with people who live alone having to pay an average of £7,080 a year on mortgage or rent compared with £3,804 for someone living with a partner. Then there are household bills and council tax. And while lone residents can claim a rebate on council tax, it is only 25% rather than the 50% it should be to equal what a couple pays.

Expensive single hotel rooms and the lack of opportunity for bulk buying at the supermarket are additional penalties.

The findings were given added impetus by the projection that the number of single-person households could reach 9.5 million over the next decade.

"If you live alone the chances are you're not going to go on holiday so much - 43% of people who live alone don't go on holiday," say Ms Robinson. "You're having to spend on necessities rather than having fun. £5,000 is a lot of money to lose a year - you could definitely have a great holiday for that."

But Stuart Adam, senior research economist at the Institute for Fiscal Studies (IFS), doubts whether the situation is as clearcut as the study presents.

"The quarter of a million figure depends first on whether you believe their £5,000 a year finding and I'd need quite a lot of convincing that they'd got their methodology right. Then to get from £5,000 a year to a quarter of a million over your lifetime they've based it on 53 years alone from 22 to 75. But nowadays people change their status all the time, going into couples and splitting up."

Buying power

It's even possible that the research is skewed because the type of person who becomes part of a couple is different from someone who stays single, he says.

And crucially it ignores the impact of benefits and tax credits, which usually favour single people, he says. Recent research by the IFS has quantified that single people claiming benefits are on average £45 a week - or £2,340 a year - better off than those in a couple. So, for those at the bottom of the income league there may be a benefit to being single, although this must be balanced against savings that couples make from economies of scale, he says.

"There are clearly financial benefits to being in a couple, the biggest thing is housing costs," says Mr Adams. "But that's not to say you're better off. We did research on the effect of tax credits and benefits and the bottom line is that it penalises couples. The Conservatives talked in their manifesto about reducing the couple penalty, but they haven't tried to bring it in yet."

Martin Lewis, founder of the website Moneysavingexpert.com, is cautious about the uSwitch figures, but accepts the basic premise that couples have a clear advantage when it comes to buying power.

"There's no doubt that single people end up paying more to live than a couple because of economies of scale. But these economies of scale can vary a lot, it all depends on how intelligent a consumer you are."

The art of being a clever consumer is more or less the same for singletons as anyone else, he says. Dropping down a brand, making a shopping list, menu planning are all ways of cutting supermarket bills. But it's harder for singles when it comes to going on holiday.

"For most hotels you pay by the room," he says. "And even if you find a single room - and they're few and far between - you'll still pay more."

But there are ways around this like going with a travel company who cater for singles by trying to fix you up with someone else. And single travellers are more likely to pick up cheap flights if availability is tight - and they also have a greater chance of being upgraded.

'Stinking rich'

But in the main the odds are stacked against singletons, Mr Lewis warns: "Most companies predicate their prices to the norm and more people are going away in pairs and families than as singles. Is it fair that they have to pay more? It won't feel fair to single people, but it's rational."

Hannah Betts, who writes the column Things You Only Know If You're Single in The Times, accepts that it is "bloody expensive" living alone. Some of her sources complain that going on holiday with couples can be impossibly expensive.

And then there's the question of one's living arrangements. She recalls how a single friend suddenly realised why her flat was such a "student hellhole" compared to the homes of couples.

"She'd stumbled across that time-honoured formula one plus one equals two Visa cards with which to hit John Lewis," she says. "Whereas one plus nada equals squat - specifically, the one you're living in. So there's a reason why couples' homes look so grown up and elegant."

Image caption More room in bed but more expensive too

And Ms Betts, 39, dismisses Ms Robinson's point that single people can't afford to have fun.

"The one thing they do is have fun. I go out every night whereas some of my married friends never do. Then there's the SWOFTIES - single women over fifty - who like clubbing, twitter and exotic holidays. They don't have pensions but they're having a fabulous time.

"Part of being single is having this carpe diem lifestyle - when you're single one's social life is one's life."

If there's one positive thing that comes out of the study it's debunking the myth that single people are rolling in money, she says.

"It's a reprimand to those couples who say that by dint of not having children you're stinking rich. And that is a huge area of resentment between breeders and lone rangers."

But in the end the materialists are missing the point, she argues.

"It is expensive,but for me it's more 'what price freedom?' The people I know are single out of choice."