Yes, the current maximum allowance is £20,000 or £1,666 per month (please see Regular Premium Investment ISA if you wish to save monthly) for the tax year which runs from 6 April to 5 April. The minimum you can invest in the Sheffield Mutual Investment ISA is £30 per month or a single initial lump sum of £300. However, if you save any part of your annual allowance in a cash ISA, an innovative finance ISA or lifetime ISA with another provider, this should be deducted from the overall limit.