For cash held in a Dodl ISA or Lifetime ISA you will earn 5% gross interest on cash held in these accounts. You can read more about the interest paid in these accounts here.
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Note: Dodl does not pay interest on cash held in a pension or GIA. So it's important to invest as much of the cash you pay in as you can. Just remember you’ll need to keep a small cash balance handy to cover your Dodl account charge, collected monthly from your available cash (not from your investments)