Free WooCommerce invoice tool

Calculate whether manual WooCommerce invoices are already costing more than €49.

Use this calculator before buying or requesting early access. If invoice requests, VAT/BTW corrections, PDF resends, and refund credit notes already cost more than a plugin license, Lattice Invoices has a clear ROI case.

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Invoice ROI calculator

Estimate the monthly admin leak

The default values model a modest EU B2B WooCommerce store: 12 invoice-related requests per month, 8 minutes per request, €45/hour internal cost, plus a few correction loops. Adjust the inputs to match your store.

Invoice requests per monthHow often customers ask for a VAT/BTW invoice, corrected invoice, or PDF resend.Minutes per requestCopying order data, checking VAT details, creating/sending PDFs, and answering email.Internal hourly cost (€)Use owner/admin time, agency support time, or finance ops cost.Correction loops per monthMissing VAT number, wrong invoice email, refund credit note, or customer lost the PDF.

Estimated admin leak

Hours lost per month

2.0h

Estimated monthly cost

€90

Estimated yearly cost

€1080

€49 payback estimate

At this volume, a €49 invoice workflow pays back in roughly 17 days if it removes the manual invoice queue.

How to use the number in a buying decision

If the monthly cost is higher than €49, the invoice workflow is not a speculative plugin purchase. It is a small operational fix for a recurring WooCommerce support cost. The stronger the B2B mix, the more urgent VAT/BTW fields, customer downloads, and credit notes become.

Store type	Typical input	What it reveals	Action
Small B2B store	6 invoice requests	€90/month admin leak	€49 workflow can pay back in the first month
Growing EU store	20 invoice requests	€300+/month admin leak	Fix before support becomes a recurring queue
Agency-managed shop	Multiple client stores	Repeated support minutes	Use the score as a client handoff argument