About this form

Use GST103B to file a goods and services tax (GST) return that includes a provisional tax calculation under the GST ratio option.

When to use this form

Use the provisional tax section for a compulsory provisional tax payment period when you use the GST ratio option.

What you will need

• sales and income details
• purchases and expenses details
• credit and debit adjustments, if any
• the ratio percentage from your notification letter

Related forms and guides

• Not using the ratio option? See GST101A – Goods and services tax return.

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