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Castle Trust Bank increased the interest on its fixed Cash ISA this week to 4.16% AER, earning an "excellent" Moneyfacts rating.

The interest rate on the e-Cash ISA is fixed for three years, and savers can launch the account with a minimum deposit of £1,000. Commenting on the new deal, Adam French, head of news at Moneyfactscompare.co.uk, said: "Castle Trust Bank has increased the return on its 3 Year Fixed Rate e-Cash ISA, and it is now a market-leading rate of 4.16% AER. The return is comfortably above current inflation forecasts, making it ideal for those with at least £1,000 to save and looking for risk-free guaranteed real returns that aren't liable for tax.

"Savers also benefit from a little flexibility as they can make additional deposits for up to 14 days from account opening."

A maximum of £500,000 can be saved in the account, and earlier access is an option on closure, only subject to a 270-day loss of interest.

Further additions are permitted for 14 days from the account opening. Transfers are permitted, it accepts cash and stocks and shares ISAs. Transfers out are also permitted, subject to a 270-day loss of interest penalty. The account can be opened online via the mobile app.

If you're looking for an ISA, Moneyfacts has created a chart of accounts that pay the top interest rates.

Placing just below Castle Trust Bank's deal in the three-year fix market, Cynergy Bank's Three Year Fixed Rate ISA offers 4.15% AER on a minimum deposit of £500. Interest is paid on the anniversary, and earlier access is permitted upon closure only and will be subject to a 180-day loss of interest.

Charter Savings Bank's Three-Year Fixed Rate ISA follows with an interest rate of 4.13% AER on a minimum deposit of £5,000. Earlier access will be subject to a 270-day loss of interest.

UBL UK's Three Year Fixed Rate Cash ISA also places competitively, with an AER of 4.12%. Interest is paid on maturity, and savers can launch the account with a minimum deposit of £2,000. Earlier access is permitted on closure only and will be subject to a 270-day loss of interest.