In the tax year 2010/2011 you can put up to £5,100 in a cash ISA. Remember that you are only allowed one cash ISA each financial year. You can choose Save up to £5,100 in a cash ISA or  save up to £10,200 in a stocks and shares ISA or save up to £5,100 in a cash ISA and put the remainder of the £10,200 allowance into a stocks and shares ISA. Natwest offer both instant access and fixed rate ISAs.

Account	Interest AER	Minimum Investment	Summary
e-ISA	Investments under £10,000 2.00%, under £30,000 2.23% and over £30,000 2.50%.	£1	Monthly tax-free interest – paid directly into your account. Account can be operated online only.
1 Year Fixed	2.65%	£1,000	To take advantage of these rates your account must be opened no later than 16th March 2011. Interest is calculated daily and paid into your Fixed Rate ISA on the last business day in April.
2 Year Fixed	3.20%	£1,000	To take advantage of these rates your account must be opened no later than 16th March 2011. Interest is calculated daily and paid into your Fixed Rate ISA on the last business day in April.
3 Year Fixed	3.70%	£1,000	To take advantage of these rates your account must be opened no later than 16th March 2011. Interest is calculated daily and paid into your Fixed Rate ISA on the last business day in April.
NatWest Cash ISA	0.5%-2.00% depending on the balance.	£1+	No penalty withdrawals as NatWest won't charge you for withdrawing your money. However, if you decide to make a further deposit, remember that you can only deposit a maximum of £5,100 over the entire tax year. Branch, post and internet access.