Next month will see a revolution in how your bank and building society accounts are taxed. Until now, your account provider has automatically whipped 20% from the interest earned on savings accounts and passed the money to the taxman. But from 6 April this decades-old system will be swept away, and all the interest earned on your savings will be paid out in full, without any tax deducted.

What's more, the government is introducing a personal savings allowance of up to £1,000 a year in interest, which means the vast majority of people won't have to pay tax on their savings income. In the past, the cash Isa sheltered your savings from tax - but now people are asking if there is any point in having an Isa any more.

The new tax system works like this: if you are a basic rate taxpayer - ie you earn less than £43,000 a year - then you will be allowed to earn up to £1,000 in interest without having to pay tax or declare it on a tax form. If you earn more than £1,000 in interest then your bank or building society will contact HMRC, which will tax the money by making a downward adjustment to your annual tax code.

But it's difficult to earn more than £1,000 in interest with rates at rock-bottom lows. If, for example, you put your savings into the current best easy access account, the Freedom Savings Account from RCI Bank, the interest rate is only 1.55%, which means you would need to have £64,516 in savings to bust the £1,000 annual interest limit. The cash Isas from the big banks pay even less: Barclays, for example, pays just 0.8% on its variable rate Isa. A Barclays customer would need to have more than £125,000 in their savings account to produce an interest income of more than £1,000.

If you earn more than £43,000 a year it's a different story. Higher rate taxpayers are only allowed to earn £500 in interest over the year without having to pay tax. In the case of the RCI account, you will be taxed if you have more than £32,258 in savings. For people who are 45% taxpayers - earning more than £150,000 a year - there will be no personal savings allowance, and they will have to pay tax at 45% on any savings interest.

Susan Hannums, director at, says savers should simply go for the best rates possible rather than focusing on whether or not the account is a tax-free Isa. "Savers will have greater flexibility as they will be able to choose from the very best savings accounts available to them, which could be a cash Isa, a normal savings account, or even a high interest current account."

Several current accounts pay much higher rates of interest than savings accounts. For example, TSB's current account pays 5% on balances up to £2,000, provided you pay in £500 a month and register for internet banking. You also get 5% cashback on the first £100 spent each month on your contactless debit card until the end of this year, as well as access to a regular savings account paying up to 5%.

If you have more to save, Santander's 123 account pays 3% on balances up to £20,000. There's a £5 monthly fee, but the account pays cashback on utility bills which should cancel this out.

Bear in mind, however, before turning your back on cash Isas for good, that when interest rates eventually start to rise, the amount you can save before you use up your savings allowance will fall. For example, if a basic rate taxpayer saves into an account paying 4.15%, they would only need to deposit £24,096 before they use up their personal allowance, or £12,948 if they are a higher rate taxpayer.

Charlotte Nelson of says: "Isas should not be overlooked, particularly if you are able to save up to the Isa limit each year, as the cash saved within the Isa will be tax-free indefinitely. While most savers may not save enough to earn £1,000 in interest now, it is quite possible they could in future."

Martin Lewis of MoneySavingExpert reckons savers should not abandon Isas. "For most people it will still be best to put your money in a top cash Isa first, and then use the personal allowance after that. Money in a cash Isa is protected from tax year after year, so you can gradually protect more and more. So even if this isn't relevant now, if you later have larger savings or become a higher rate taxpayer then it is worth doing, just in case."