One card to rule them all

If you’re tired of carrying around half a dozen different credit and debit cards, the Curve card could provide the solution, says Ruth Jackson.

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Curve combines your cards via one app

If you're tired of carrying around half a dozen different credit and debit cards, you might want to consider a new card that aims to replace them all. The Curve card allows you to combine all your Visas and Mastercards (not American Express) via one app. Then you simply do all your shopping with the Curve card, assigning the spending to whichever of your cards you want. It is a debit card, so you can use it everywhere, but after you've made your purchase you can assign this to a credit card if you want. So if you have a cashback or rewards credit card, you can earn even in places that don't accept credit cards. You can also change which card you use for a payment up to two weeks after.

If you lose your Curve card, you can lock it via the app, and then unlock it later if you find it. The details of all your linked cards aren't stored on the Curve card or the app, so thieves wouldn't be able to access all your card information.There are some drawbacks though. First, you'll lose your Section-75 consumer protection. Usually, if you pay with a credit card and there is a problem, you can go to the card firm for redress. Using Curve invalidates this.

Also, if you have a rewards card (see below) that gives you different levels of cashback or points depending on where you are spending, you'll lose out with the Curve card. All transactions will be listed as going to Curve on your credit-card statements. For example, if you have a John Lewis card that gives one point for spending at Waitrose and John Lewis and half a point for spending elsewhere, you would only ever earn half points.

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The Curve card also won't suit big spenders. It has a daily spending cap of £2,000, a monthly limit of £5,000 and a maximum £10,000 in a year (though these limits go up once you've "cultivated a spend history" with the company). Finally, don't use the Curve card abroad you'll be charge 1% on top of the exchange rate for purchases and there is a £2 charge to withdraw cash.

Three of the best cards for earning rewards

Credit-card rewards are getting stingier due to restrictions on fees, but there are still a few good deals.

American Express remains the top choice for anyone who wants to earn as they spend. The Platinum Everyday card pays 5% for the first three months on up to £2,000 of spending. Then the rate falls to 0.5% on the first £5,000 spent per year, and 1% above that. Pay £25 a year and you can get the Amex Platinum cashback card. This pays 5% on up to £2,500 in the first three months, then up to 1.25% after that (so upgrading is worth it for big spenders).

If you are loyal to Asda, John Lewis or Amazon, then it is worth looking at their own reward cards. An Asda Money card gives 1% cashback on shopping with them (payable in Asda vouchers) and 0.5% elsewhere. John Lewis' Partnership Card rewards you with one point for every £1 spent at John Lewis or Waitrose, and one point for every £2 spent elsewhere. Each point is worth a penny in John Lewis gift vouchers, so it's the same cashback rate as the Asda card. The Amazon Platinum pays a voucher cashback rate of 0.75% on Amazon purchases and 0.5% elsewhere.

The British Airways Amex card gives you 5,000 bonus Avios points (which can be spent on things like hotels and flights) if you spend £1,000 in the first three months, plus one point per £1 spent. Spend more than £20,000 in a year and you'll get a companion ticket. Pay the £195 annual fee and you can get the BA Premium Plus Amex card. This gives 25,000 bonus Avios points if you spend £3,000 in the first three months and 1.5 points per £1 spent. Spend £10,000 a year and you get a free companion ticket.

Pocket change... how to exchange your bitcoin for soap

Bad news for those who took out buy-to-let mortgages between 2014 and 2016, says the Financial Times. Research by S&P Global Ratings found that 60% of buy-to-let loans taken out during these years will "effectively become loss-making", as higher-rate tax relief on mortgage interest is phased out. Those taking out loans during this particular three-year window are especially "vulnerable" because loans were underwritten in a low-interest rate environment with a minimal stress test on the assumed interest rate; and these landlords are unlikely to have benefited from much rental inflation during those years, so won't have much surplus cash.

The introduction of stricter mortgage-lending rules has led to a rise in specialist lenders offering niche mortgages, says The Sunday Times. Holmesdale Building Society, for instance, offers a mortgage designed for unusual homes, including old windmills, while Metro Bank offers a "generous multiple of 5.5 times salary" for "fully qualified" lawyers, accountants, doctors and actuaries. Scottish Widows offers a preferential rate of 1.54% fixed for two years for vets and dentists with a 40% deposit. Finally, Market Harborough Building Society has a special "divorce" mortgage that "factors in" money you'll receive from the sale of your marital home.

Bitcoin may be hugely popular among speculators, but using it as a currency is a little more problematic, says The Daily Telegraph. "Transaction fees are high, processing times can be lengthy and price fluctuations pose problems for both sellers and buyers." So who accepts bitcoin? The online shops of second-hand chain CeX and cosmetics company Lush, hotel and flight-booking service Expedia and that's about it. Beyond that, Microsoft customers can redeem Bitcoin to add funds in pounds to their online account, which can then be used to buy games, apps and films in the Windows and Xbox stores.

Ruth Jackson-Kirby

Ruth Jackson-Kirby is a freelance personal finance journalist with 17 years’ experience, writing about everything from savings accounts and credit cards to pensions, property and pet insurance.

Ruth started her career at MoneyWeek after graduating with an MA from the University of St Andrews, and she continues to contribute regular articles to our personal finance section. After leaving MoneyWeek she went on to become deputy editor of Moneywise before becoming a freelance journalist.

Ruth writes regularly for national publications including The Sunday Times, The Times, The Mail on Sunday and Good Housekeeping, among many other titles both online and offline.