Invoicing software for contractors has to express three things a generic tool cannot: progress billing against a contract value, retainage withheld from each draw, and change orders tied to the date the client approved them. Here is how each works, and how to bill all three free.
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The practical jobs this tool needs to handle:
Three things: bill a percentage of a contract rather than a flat amount, withhold and track retainage across draws, and carry change orders as separate approved lines. A tool that cannot do those will produce invoices that get short-paid or queried on almost every job.
Yes — you can build progress invoices with retainage and change-order lines here for free, with no signup. The paid tier adds saved clients, recurring invoices and payment tracking, but the invoice itself costs nothing.
Show it as a deduction line on each draw — the percentage withheld this period and the cumulative amount held. At completion you invoice the retained total as its own final invoice, referencing the earlier draws it was withheld from.
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