Shares don't add up to 100%?

The tool shows the running total and won't split until it's exactly 100%.

Who pays the extra cent?

Odd cents go to the owners with the largest leftover fraction (then the larger share, then the earlier row), so the split always adds up to the bill exactly. The total and the GST are split separately.

Does each owner need their own invoice?

Not always. For $1,000 or more, a tax invoice to several recipients must show each one's identity or ABN (ATO).

Use "Copy as text" to paste it into a group chat or email. It runs in your browser.

Split a horse bill between owners

Shared a horse with friends or family? Enter the bill total, whether it includes GST, and each owner's percentage. The splitter shows what each person owes, including their share of the GST, with cents rounded so the parts add up exactly to the bill. Use it for vet, farrier, training, agistment or transport bills. If an invoice is issued to several owners, the ATO says a tax invoice of $1,000 or more must show the identity or ABN of each recipient. Australia only.

Australia only

Bill total ($)

The amount is

GST on this bill

GST shown on the bill ($)Leave blank to use 1/11 (inc) or 10% (ex)

Owners

NameShare %

Running total: 100%

Bill total (inc GST)

–

Enter the bill total to see each owner's share.

Privacy: Runs in your browser. Names stay on your device and are never put in the link.

Calculation aid only. Your syndicate or partnership agreement decides who pays what. Whether you can claim GST credits depends on your own GST registration. Not tax advice. This tool gives an estimate only. It is general information, not veterinary, nutrition, legal or tax advice. Every horse and every situation is different. Check with your vet, equine dentist, farrier or a registered tax agent before you act on the result.

General information only. Not financial, legal or tax advice. Check with your accountant or the ATO.

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How to use it

Enter the bill total and GST status.
Add owners and their %. The running total must reach exactly 100%.
Read each owner's amount, then copy it as text.

Questions

Shares don't add up to 100%?: The tool shows the running total and won't split until it's exactly 100%.
Who pays the extra cent?: Odd cents go to the owners with the largest leftover fraction (then the larger share, then the earlier row), so the split always adds up to the bill exactly. The total and the GST are split separately.
Does each owner need their own invoice?: Not always. For $1,000 or more, a tax invoice to several recipients must show each one's identity or ABN (ATO).
Can I export it?: Use "Copy as text" to paste it into a group chat or email. It runs in your browser.
Is it tax advice?: No.

Sources

Sources checked: 17 Oct 2026.

ATO: Tax invoices (updated 18 Sep 2026)