The Tax File Number Updated Alert (Modal) is displayed when editing a

1. Australian Resident Payee after entering 
   1. a Valid Tax File Number or 111-111-111, 333-333-333 or 444-444-444 where the required validation has passed
2. Working Holiday Maker after entering
   1. a Valid Tax File Number or 111-111-111 where the required validation has passed

Once Ok is selected, and the Payee is 

1. an Australian Resident 
   1. whose birthday is < 60 years in the past and Tax File Number is now Valid, 111-111-111 or 333-333-333, 
      1. Tax Treatment will be set to Regular.
   2. whose birthday is ≥ 60 years in the past and Tax File Number is now Valid, 111-111-111 or 333-333-333,  
      1. Tax Treatment will be set per the previous selection (e.g. If Seniors and Pensioners was selected, this is also the new setting).
   3. whose birthday is ≥ 60 years in the past and Tax File Number is now 444-444-444,
      1. Tax Treatment will be set to Seniors and Pensioners.
2. a Working Holiday Maker
   1. Tax Treatment will be set to Working Holiday Maker.