Microsoft Excel formula for calculating stamp duty in Tasmania (TAS), Australia. The output of this formula matches the official calculator (which rounds inputs to the nearest $100), but doesn't match the "letter of the law".

excelStampDutyTasmaniaAustralia-reproduceOnlineCalculator

=
IF(A1 > 725000, 27810 + 0.045  * (CEILING(A1,100) - 725000),
IF(A1 > 375000, 12935 + 0.0425 * (CEILING(A1,100) - 375000),
IF(A1 > 200000,  5935 + 0.04   * (CEILING(A1,100) - 200000),
IF(A1 >  75000,  1560 + 0.035  * (CEILING(A1,100) - 75000),
IF(A1 >  25000,   435 + 0.0225 * (CEILING(A1,100) - 25000),
IF(A1 >   3000,    50 + 0.0175 * (CEILING(A1,100) - 3000),
                   50)
)))))