Economy COVID-19: Australia's NAB taps investors for $2.2 billion as coronavirus hits profit Updated : April 27, 2020 11:02 AM IST Though NAB is Australia's third-largest bank, it is the country's biggest small business lender. The bank also took more than A$1 billion in one-off charges for writedowns on the value of its software and refunds to customers wrongly charged account-keeping fees, as previously foreshadowed. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.