GST on Advance Payments: What You Owe Before the Work Is Done

Asking for an advance is good practice. It filters out the customers who were never going to pay and it funds the start of the work.

It also creates a tax liability the moment the money lands, which is the part that surprises people.

The rule for services

For services, GST is due on receipt of an advance, even though no invoice has been raised and no work has been delivered. You issue a receipt voucher, and the tax goes into that period's return.

For goods, the position is different and advances are generally not taxed at receipt. If you deal in both, do not assume one rule covers everything.

What this means in practice

A 30% advance on a large job can produce a tax payment weeks before the customer pays the balance. Businesses that treat the whole advance as working capital sometimes find they have already spent the tax portion.

When the deal falls through

If the work is cancelled and the advance is refunded, you issue a refund voucher and adjust the tax. It is recoverable, but only if the receipt voucher existed in the first place. An advance taken informally with no paperwork is very hard to unwind cleanly.

The practical habit

Treat an advance like any other taxable event. Record it against the customer, generate the voucher, and mentally set the tax portion aside rather than counting the full amount as available cash.

Businesses that do this find advances genuinely helpful. Businesses that do not find them helpful for a month and awkward at filing time.