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IsValidTFN ( text )

Validate TFN

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James - Show more from this author Northwest Enforcement https://nwenforcement.com

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

Case( IsEmpty( text ) ; 1 ; Let( [ TFN = Filter ( text ; "0123456789" ) ; TFN01 = Middle ( TFN ; 1 ; 1 ) ; TFN02 = Middle ( TFN ; 2 ; 1 ) ; TFN03 = Middle ( TFN ; 3 ; 1 ) ; TFN04 = Middle ( TFN ; 4 ; 1 ) ; TFN05 = Middle ( TFN ; 5 ; 1 ) ; TFN06 = Middle ( TFN ; 6 ; 1 ) ; TFN07 = Middle ( TFN ; 7 ; 1 ) ; TFN08 = Middle ( TFN ; 8 ; 1 ) ; TFN09 = Middle ( TFN ; 9 ; 1 ) ; TFNSum = ( TFN01 * 1 ) + ( TFN02 * 4 ) + ( TFN03 * 3 ) + ( TFN04 * 7 ) + ( TFN05 * 5 ) + ( TFN06 * 8 ) + ( TFN07 * 6 ) + ( TFN08 * 9 ) + ( TFN09 * 10 ) ] ; Length( TFN ) = 9 and Mod ( TFNSum ; 11 ) = 0 ) ) Click to copy

Validates Australian TFN (Tax File Numbers) numbers. The result is either 0 (not valid) or 1 (valid ). Null imput evaluates to 1.

It ignores all spaces and other separators.

This function uses the checksum algortithm as published by the Australian Government.

Currently suitable for 9 digit TFN only.

References:
http://www.clearwater.com.au/code/tfn
IsValidABN ( text )

 

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