Top fixed rate cash Isas are disappearing in days so bag one of these while you can: SYLVIA MORRIS

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Savers are being showered with new cash Isa deals – but these offers may not be around for long.

Rates on ordinary savings accounts are falling but cash Isa deals are bucking the trend.

That’s because savers tend to dash to make the most of their £20,000 Isa allowance before it resets in April.

Coventry Building Society launched a cash Isa paying a fixed 4.13 per cent until May 31, 2027. 

This looked very generous, until it was trumped by Shawbrook Bank at 4.14 per cent, fixed for a year and then Cynergy Bank at 4.16 per cent.

That led both Investec Bank and Tembo to up their rate to 4.14 per cent. Then came Tandem, leapfrogging them with 4.15 per cent.

You could do well to grab these top deals when they appear as I am not expecting rates to rise much further.

However, if rates do increase, I think it’s likely they’ll be tiny, at around 0.01 to 0.05 percentage points. So there’s little point in waiting. 

Hot deals: Rates on ordinary savings accounts are falling everywhere you look – but cash Isa's are bucking the trend

Top two-year rates come from Tandem Bank (4.11 per cent), Cynergy Bank (4.1 per cent), United Trust Bank (4.09 per cent) and Coventry BS (4.06 per cent). 

If you prefer an easy-access account, you can earn great rates if you are willing to open an account through an app – Atom at 4.25 per cent or Trading 212 at 4.4 per cent (including a 0.8-percentage point bonus paid for 12 months). 

Cynergy Bank has upped its Online Isa rate for new savers from 4 per cent to 4.1 per cent.

However, one of my favourite easy-access Isas is the Market Tracker Cash Isa from Family BS, which has reopened to new savers with a rate of 4.03 per cent.

It tracks the rate paid by the top 20 accounts on £10,000. It takes their average and then adds 0.05 per cent.

So while the other top rates can change at any time, with the Market Tracker Cash Isa you know exactly what your rate is for three months.

However, it is not a flexible cash Isa. That means that if you take money out and put it back in, the replacement is deemed part of your £20,000 cash Isa allowance for this tax year.

Cash Isas typically offer lower rates than ordinary accounts, but the gap between them has all but disappeared following the recent cash Isa rate rises.

If you’re deliberating, I’d go for a cash Isa to squirrel as much as possible out of the taxman’s reach while you can.

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Take Hart with this niche super saver (if you can)

If you prefer branch-based savings accounts rather than online ones, a new offering from Harpenden Building Society might be up your street.

Its Hart Saver Issue 1 is an easy-access account for those who live in its operating area with a postcode AL, HP, LU or WD. It can be opened in a branch or by post.

It pays 3.96 per cent and is only beaten by Kent Reliance (4.05 per cent) and Family BS (3.98 per cent). All you need to open it is £100.

There are no restrictions on withdrawals, either. Meanwhile, Virgin Money’s regular saver looks good if you are building up an emergency fund. It pays a fixed 6.5 per cent and runs until February 2027, if you have a qualifying current account with Virgin Money.

If you save the maximum £250 a month, you will end up with £3,106, including £106 interest.