Wave · Sales Tax and GST

How to Fix Wave Tax Error

Sales tax is not calculating on invoices, the wrong rate is applied, GST is missing from a return, or your tax report does not agree with what you actually collected.

At QuickFix Bookkeeping, the rule that fixes most of these: tax is applied per line, not per invoice. Creating a tax rate in settings does nothing on its own. It has to be attached to the individual line items, and a line with no tax attached is silently zero-rated.

What Causes This

Tax not applied to the line

The rate exists in settings but was never attached to the invoice line, so it silently calculates as zero.

Rate created but not enabled

A tax rate that is saved but not marked for use will not appear as an option when invoicing.

Wrong rate for the region

Sales tax and GST vary by jurisdiction. The default rate may not match where the customer actually is.

Recoverable flag wrong

A tax marked as non-recoverable when it is recoverable understates what you can claim back.

How to Fix It

METHOD 1Attach the Tax to the LineTax shows as zero
1

Go to Settings, then Sales Taxes and confirm the tax rate exists and is correctly named, with the right percentage.

2

Now open the invoice. On each line item, select the tax from the dropdown in the tax column. Creating the rate in settings does not apply it to anything by itself.

3

To avoid doing this every time, set a default tax on the product or service so it applies automatically whenever that item is used.

METHOD 2Fix a Wrong RateAmount collected is wrong
1

A tax rate that has already been used on transactions should not simply be edited, because that changes the historical figures on invoices you have already issued.

2

Instead, create a new tax rate with the correct percentage, and archive the old one so nobody selects it again. Use the new rate going forward.

3

For invoices already issued at the wrong rate, correct them individually or issue a credit note and reinvoice, depending on whether the customer has paid.

METHOD 3Reconcile Your Tax Report to Your InvoicesReport does not match
1

Run the Sales Tax Report for the period and compare it against your invoice list.

2

A gap almost always means invoices where the tax was never applied to the line. Those show as zero-rated sales and quietly understate the tax you owe, which is a filing problem, not just a reporting one.

3

Find them by filtering for invoices with no tax and checking whether each one genuinely should be tax-free.

METHOD 4Check the Recoverable SettingClaiming back the wrong amount
1

On the tax rate, check whether it is marked as recoverable. Recoverable tax paid on purchases can be claimed back against tax collected. Marked wrongly, you either overpay or overclaim, both of which surface at filing time.

An Understated Tax Return Is Not a Reporting Problem

If invoices went out with no tax applied, you have almost certainly under-collected and under-declared. That is a filing exposure, not a cosmetic one, and it compounds every period it goes unnoticed. Reconcile your tax report to your invoices before every filing, not after.

Related Guides

Tax Return That Does Not Match Your Books?

Let QuickFix Bookkeeping Reconcile It.

Invoices issued without tax applied under-declare what you owe and the exposure grows every period. We find them, correct the setup, and reconcile your returns to your actual sales.

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