For further information on your tax residency, please refer to the rules governing tax residence that have been published by each national tax authority: https://www.oecd.org/tax/automatic-exchange/crs-implementation-and-assistance/tax-residency/
You can also find out more at the OECD Automatic Exchange of Information portal: https://www.oecd.org/tax/automatic-exchange/
For CRS: the OECD website provides more information about the CRS and the jurisdictions taking part: www.oecd.org/tax/automatic-exchange/
For FATCA: additional information can be found on the Inland Revenue Service’s (IRS) website: https://www.irs.gov/businesses/corporations/foreign-account-tax-compliance-act-fatca
OakNorth Bank Plc is not in the position to give tax advice, so if you are not sure how to complete the form from the tax perspective, please visit the OECD or IRS websites or speak to a professional tax advisor.