How much is that late GST payment actually costing you?

Missed a GST payment or filed late? The cost can add up quickly.

Our GST Penalties & Interest Calculator gives you an estimate of the penalties and interest that may apply to overdue GST, so you can get a clearer picture of what you could be up for.

A quick note: This is a useful estimate, but IRD can do weird things with individual cases. This calculator is for educational and estimation purposes only. Complex situations, including long-term overdue debt or cases where penalties have been partially or differently applied, may not produce the same result as your IRD account.

If you’re in a situation-ship with GST and things are little complicated, fill out the form below to get personalised advice from a Sidekick advisor.

Use the calculator below

GST Penalties & Interest Calculator

Estimate the penalties and interest that may apply to overdue GST.

Your GST details

GST amount owing Enter the GST principal originally owing.

GST payment due date Penalties and interest start from the day after the due date.

Calculate up to Usually today's date.

UOMI interest rate Enter the applicable annual UOMI rate as a percentage.

Payments already made

Add any payments you've made against this GST debt. Each payment is allocated against accrued interest first, then GST principal, then penalties.

Estimated amount owing

GST principal remaining

$0.00

Interest still owing

$0.00

Penalties

$0.00

Estimated total amount owing

$0.00

Days overdue 0

Total interest charged $0.00

Interest already paid $0.00

Interest still owing $0.00

1% late payment penalty $0.00

Additional 4% penalty $0.00

Total payments entered $0.00

Credit carried forward $0.00

How this works: Interest is calculated daily using the UOMI rate entered above. The calculator keeps track of the total interest charged over the overdue period separately from interest that has already been paid. Payments are allocated to accrued interest first, then GST principal, then penalties. Any amount left after the debt has been cleared is shown as credit carried forward.

This calculator provides an estimate only. Actual interest, penalties, payment allocation and amounts owing may differ from the amount calculated by Inland Revenue. Check your myIR account or speak with your accountant for the actual amount payable.