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GST can be handled in Oasis in two ways (or not at all). To switch on/off GST, select Preferences, My Money, Invoice Options and set Field #6 “Üse GST in this practice” to Y or N as required.

If set to Yes, then you need to select Preferences, My Money, GST Rates and Options to configure how GST will be handled in the practice. It can be based on payments received, or on invoices raised. Item codes need to be flagged as GST items, as not all item codes attract a GST (in Australia).

The GST Rates and Options table is as follows:

Tax Rate                                                    10%                         The GST rate in force

Round to cents                                          001                          The rounding value for calculations

GST Item Code                                          /GST                       A general item code used for GST

GST Description                                         Plus GST                the description linked to the item above

Base GST on individual items                    Y                             Australia doesn’t have blanket GST

Add GST to Each item line                         N                            When set to Y, item fee is GST exclusive

Subtract GST from each line                      Y                            When set to Y, item fee is GST inclusive

GST subtraction rate                                   0.90909                 The rate for calculating subtracted GST

Disable reducing GST on Discounts           Y                            If set to Y, the system won’t adjust GST when discount is applied

Base GST on Invoices/Payments                P                           The system is set to Payments (cash practice) ("I" for Invoice implies an accrual practice).


Once configured, GST is calculated automatically for every GST item that is billed/paid for in the system. All GST amounts are recorded in the Other, GST Reporting screen.


The GST reporting screen is designed to record all GST on a periodic basis. It is up to you to “close off” your GST at the appropriate time (usually coinciding with your BAS).


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