Invoice instrument no. 01

Make the early amount impossible to misread.

Set the basis, tax treatment, dates and rounding once. Get an exact payment card for your invoice—and a clean receipt when it is paid on time.

Set payment terms

Local-first. Your invoices stay on this device.

A fictional teal and cream desktop accounting instrument with invoice slips, a date dial, and a coral signal button. — Three controls. One exact amount.

Workbench / live calculation

Set the terms you actually agreed

Every choice remains visible on the output. Nothing is inferred from your region.

01 Invoice

Invoice reference Optional Currency

Net amount Tax amount

Enter the figures printed on your invoice. Do not include thousands separators.

02 Discount logic

Discount rate (%) Currency rounding

Discount basis and tax treatment

Whole invoiceApply the rate to net + tax. Net + proportional taxRound the net discount and tax reduction separately. Net only; tax fixedDiscount net and leave the entered tax unchanged.

03 Dates

Issued Discount deadline Final due date

Names and note for the printed card

Supplier name Customer name

Payment note Optional

Local ledger

Versions you can audit

Your current draft is always kept on this device. Plus unlocks reusable templates, saved versions and paid-on-time receipts.

No saved versions yet.

Save a calculation to preserve what the customer saw.

Permanent utility

Keep the paper trail for $19 once.

The free calculator, payment card, and data export stay free. Plus adds unlimited saved versions, reusable term templates, and paid-on-time receipts on this device.

No subscription
Hosted checkout
Restore on another device

Free calculator active

Buy Plus — $19 once

Have a license? Restore it

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Your data

Take the ledger with you

Export is never paywalled. JSON preserves every field; CSV is convenient for checking saved amounts.

Import JSON

You remain the reviewer.

Tax and discount rules vary by contract and region. This tool applies the choices shown; it does not decide which treatment is legal or create accounting entries. Verify the card against your invoice before sending it.