--- title: Turn an unpaid invoice into a Certified Mail demand packet description: Upload the invoice instead of retyping it from scratch. PostalForm reads likely invoice facts, builds an editable demand letter and exhibit index, keeps the original invoice in the packet, and lets you review the exact PDF before mailing. seotitle: Invoice to Certified Demand | Build and Mail the Packet seo-description: Upload an unpaid invoice, extract the amount and dates, add exhibits and a payment link, preview the demand packet, and mail it by Certified Mail. group: use-cases indexable: true schema: webpage eyebrow: Payment recovery published: 2026-07-12 updated: 2026-07-13 path: /invoice-to-certified-demand cta-label: Turn my invoice into a demand cta-href: /forms/payment-demand-packets?lane_friendly_reminder=false&lane_final_demand=true cta-note: Upload the invoice first. Review the extracted facts, letter, exhibits, payment link, and Certified Mail options before paying. cta-action: link --- # Turn an unpaid invoice into a Certified Mail demand packet Upload the invoice instead of retyping it from scratch. PostalForm reads likely invoice facts, builds an editable demand letter and exhibit index, keeps the original invoice in the packet, and lets you review the exact PDF before mailing. ## What the invoice-first builder does 1. **Reads the invoice PDF.** It suggests the invoice number, issue date, due date, amount due, customer name, and description when those details can be found confidently. 2. **Leaves you in control.** Every extracted value is editable. You confirm the facts, the recipient address, the deadline, and that no prohibited collection hold applies. 3. **Builds the evidence packet.** The generated PDF contains a cover page, the demand letter, an invoice summary, an exhibit index, and the uploaded invoice and supporting records. 4. **Includes a payment path.** Add your existing secure invoice-payment URL so the recipient can see where to pay. PostalForm does not collect the invoice balance. 5. **Mails with proof options.** Certified Mail is selected by default at checkout, with electronic return receipt available for eligible U.S. letters. [Turn my invoice into a demand](cta) ## What to have ready - The unpaid invoice PDF - The correct customer or accounts-payable mailing address - A factual description of the work, goods, or services - Any contract, estimate, completion record, or prior correspondence you want attached - Your existing HTTPS payment-page link, if you want it printed in the letter ## Built for repeat senders Contractors and small businesses can save sender details in the current browser and reuse them on the next packet. Recipient, invoice, deadline, and exhibit details remain specific to each demand. ## Construction invoice? Choose the right notice before the demand An invoice demand asks a customer to pay. A preliminary notice, pre-lien notice, or statutory construction notice can serve a different purpose and may have state-specific recipients and deadlines. Sending this demand packet does not replace a required construction notice. | Your situation | Start here | | ----------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------- | | You are collecting your own ordinary overdue invoice | [Turn the invoice into a Certified Mail demand](/forms/payment-demand-packets?lane_friendly_reminder=false&lane_final_demand=true) | | You may need an early California construction notice | [California 20-Day Preliminary Notice](/forms/california-20-day-preliminary-notice) | | You may need an early Arizona construction notice | [Arizona 20-Day Preliminary Notice](/forms/arizona-20-day-preliminary-notice) | | You are researching a Texas pre-lien or monthly notice for unpaid construction work | [Texas Notice of Claim for Unpaid Labor or Materials](/forms/texas-notice-of-claim-unpaid-labor-materials) | | You may need to notify Florida project parties | [Florida Notice to Owner / Notice to Contractor](/forms/florida-notice-to-owner) | If both paths may apply, check the construction-notice deadline first. You can still send a separate factual payment demand, but it should not be treated as the statutory notice. ## This is a factual payment request, not legal process The workflow is for an original creditor or its employee collecting its own invoice under its own name. It is not for a collection agency, debt buyer, law firm, lien notice, lawsuit, or an account subject to a bankruptcy stay or other collection hold. It does not add unlisted interest, fees, penalties, or legal claims. ## Frequently asked questions ### Does invoice extraction mail anything automatically? No. It only suggests values. You review the complete PDF, addresses, mailing service, and price before payment, and nothing mails until you approve the order. ### Can I attach more than the invoice? Yes. You can append contracts, scope documents, completion proof, prior correspondence, and other supporting records behind the exhibit index. ### Is Certified Mail required? Certified Mail is selected by default for this workflow because delivery evidence is often the point of a mailed demand. You can review the available mailing options before checkout. ### Does PostalForm process the invoice payment? No. Add an existing secure HTTPS payment link from your invoicing or payment provider. PostalForm prints that link in the demand packet but does not receive the balance owed. ## Related resources - [Demand letter guide and payment-recovery paths](/demand-letters) - [Demand letter for payment guide](/guides/demand-letter-for-payment) - [Payment demand letter template](/letters/payment-demand-letter-template) - [Payment Demand Packets](/forms/payment-demand-packets) - [Contractor payment request letter sample](/letters/contractor-payment-demand-letter-template) - [California 20-Day Preliminary Notice guide](/resources/california-20-day-preliminary-notice) - [Arizona 20-Day Preliminary Notice guide](/demand-letters/arizona-20-day-preliminary-notice) - [Texas Notice of Claim guide](/demand-letters/texas-notice-of-claim-unpaid-labor-materials) - [Florida Notice to Owner guide](/demand-letters/florida-notice-to-owner-online) - [How to organize demand packet attachments](/demand-letters/how-to-organize-attachments-for-a-payment-demand-packet) - [Certified Mail online](/certified-mail-online) [Build the demand packet from my invoice](/forms/payment-demand-packets?lane_friendly_reminder=false&lane_final_demand=true) ## Ready to send it? Upload the invoice first. Review the extracted facts, letter, exhibits, payment link, and Certified Mail options before paying. [Turn my invoice into a demand](/forms/payment-demand-packets?lane_friendly_reminder=false&lane_final_demand=true)