Invoice your clients in 30 seconds

Most invoice mistakes happen at the handover: the price on the invoice doesn't match the quote, a line item goes missing, or the GST treatment changes between the two documents. That happens because quotes and invoices usually live in different tools, or in a quoting spreadsheet and an invoicing app that have never met.

In OneBookPlus the quote and the invoice are the same record at two stages of its life. You price the job, the customer accepts online, and one click converts the accepted quote to a tax invoice: same line items, same GST setting, same contact. Because nothing is re-keyed, the invoice can't drift from what the customer agreed to, and there is no Friday-afternoon session copying figures between apps. The OneBookPlus quoting software page covers the quoting half, including online acceptance and quote analytics.

If you're a sole trader, your invoicing tool has one job: get the invoice out the moment the work is done, then get out of the way. You don't have an admin person, so every minute spent formatting a document or chasing a payment is a minute of unbillable time. OneBookPlus is built around that reality. The Free plan covers invoices, quotes, contacts and the Stripe Pay Now link (at a platform fee of up to 2.5% until you subscribe) with no card required and no trial clock; automatic reminders start on Starter ($29/mo).

The GST side adapts to where your business is at. Under the $75,000 turnover threshold and not registered for GST? Your invoices go out without a GST line and without the "Tax Invoice" wording, exactly as the ATO expects. Once you register, flip the setting and every new invoice carries 10% GST and the compliant wording automatically. OneBookPlus even nudges you when your invoice settings and your GST registration status disagree, which is the mistake that quietly costs sole traders 1/11th of every sale.

Reminders matter even more when you're a one-person business, because the person who has to make the awkward "just following up" call is you. Set the schedule once (for example 3 days before due, on the due date, 7 days overdue) and the emails and SMSes go out on their own until the invoice is paid. If you're still working out what to charge in the first place, the free hourly rate calculator and sole trader tax calculator help you land on a rate that survives tax time.

"BAS-ready" is a specific claim, so it is worth spelling out what sits behind it. Each quarter (or month, for larger businesses) a business activity statement reports the GST you collected on sales and the GST you paid on purchases, and the difference is what you owe the ATO or get back. To report that without a quarter-end spreadsheet rebuild, every sale needs its GST treatment captured at the moment you invoice, not reconstructed later from bank lines that only show totals.

In practice that comes down to three things. First, a valid tax invoice for each sale, carrying the fields covered earlier on this page: the words "Tax Invoice", your ABN, the issue date, a description of what was sold, and the GST amount. Second, GST treatment that stays consistent from quote to payment, so an amount entered as GST-inclusive cannot quietly become exclusive along the way; in OneBookPlus the subtotal, the GST line, and the total always reconcile, and you can check any single figure against the free GST calculator. Third, a record of when each invoice was paid, because if you report GST on a cash basis it is the payment date, not the invoice date, that decides which quarter a sale belongs to.

OneBookPlus keeps all three as a by-product of normal invoicing: every invoice stores its GST treatment, and the moment it is paid the GST feeds the BAS-ready summary for that quarter. If you want to sanity-check a quarter before you lodge, the free BAS calculator estimates the position from your totals. If the records are currently a shoebox, the bookkeeping cost calculator shows what catching up costs when you pay someone else to do it, and the late payment interest calculator puts a number on the invoices sitting unpaid in the meantime. This is general information, not tax advice; your BAS or tax agent has the final say on your own lodgement.