# Demand Letter for Unpaid Invoice Template Source: https://nerix.ai/templates/demand-letter-for-unpaid-invoice Send a firm final demand for an overdue invoice before you take further steps. Before you send it Rules on interest, fees, debt collection and the steps before going to court differ by country, and some require a particular notice or wait. Only claim what the contract or the law lets you claim, and check local rules before you act on this letter. ## Fill it in and preview You are signed in. Fill it in your workspace and it is kept as a document you can send, share and have signed. [Open in your workspace](https://app.nerix.ai/documents/templates/demand-letter-for-unpaid-invoice) Studio Marlow 4 Canal Road, Amsterdam, [hello@studiomarlow.example](mailto:hello@studiomarlow.example) 7 November 2026 Vermeer Interiors BV 18 Keizersgracht, Amsterdam **Subject: Final demand for payment of invoice INV-2026-114, EUR 4,800** Dear Vermeer Interiors BV , ## The debt On 1 August 2026 I issued invoice INV-2026-114 for EUR 4,800 for the brand identity design delivered on 28 July 2026 . It was due on 31 August 2026 . It has not been paid, and no problem with the invoice or the work has been raised with me. I sent reminders by email on 8 September and 22 September and called on 30 September. Late interest of EUR 96 under clause 6 of our agreement ## What I ask you to do Please pay EUR 4,800 in full by **30 October 2026**, using these details: Bank transfer to IBAN NL00 BANK 0123 4567 89, reference INV-2026-114 ## If you do not pay I will pass the matter to a debt collection agency and start legal proceedings to recover the debt, interest and costs. This would add to what you already owe and can be avoided by paying by the date above. If you have already paid, please send me proof of payment at once. If you dispute the debt, please tell me why in writing before 30 October 2026 , and I will consider it. This letter is sent to settle the matter without a court, and I reserve all my rights. Yours sincerely, Studio Marlow Templates are a careful starting point, not legal advice. Where the law matters, check what applies where you are. Money and payments ## What this template is for A formal demand letter for an unpaid invoice you fill in online: the debt, earlier reminders, a final deadline, how to pay and what happens next. Word or PDF. It is free to fill in online, needs no account, and downloads as a Word document or a PDF. [See all Money and payments templates](https://nerix.ai/templates/money) Money and payments ## What you fill in The form asks for 14 details. The document fills itself in as you type. - ### Your name or business For example: Studio Marlow - ### Your address and contact For example: 4 Canal Road, Amsterdam, hello@studiomarlow.example - ### Customer For example: Vermeer Interiors BV - ### Customer's address For example: 18 Keizersgracht, Amsterdam - ### Invoice number For example: INV-2026-114 - ### Invoice date For example: 1 August 2026 - ### Original due date For example: 31 August 2026 - ### What the invoice is for For example: the brand identity design delivered on 28 July 2026 - ### Amount unpaid For example: EUR 4,800 - ### Earlier reminders For example: I sent reminders by email on 8 September and 22 September and called on 30 September. - ### Interest or fees claimed optional Only what the contract or the law allows. For example: Late interest of EUR 96 under clause 6 of our agreement - ### Pay in full by For example: 30 October 2026 - ### How to pay For example: Bank transfer to IBAN NL00 BANK 0123 4567 89, reference INV-2026-114 - ### What you will do if it is not paid For example: I will pass the matter to a debt collection agency and start legal proceedings to recover the debt, interest and costs. Money and payments ## What is inside The parts of this document, in order. - 1 The debt - 2 What I ask you to do - 3 If you do not pay Templates ## How it works - 01 ### Fill in Type your details in the form. The document fills itself in as you type; click any gap to jump to its field. - 02 ### Check Read it through. Gaps you have not filled stay marked, so nothing goes out half done. - 03 ### Download Save it as a Word document to edit further, or as a PDF to send or print. ### Make it yours with AI Open it in the chat and ask for changes: shorter, firmer, another situation, another language. [Adapt it with nerix](https://nerix.ai/try?template=demand-letter-for-unpaid-invoice) ### Was this template helpful? Money and payments ## Questions people ask ### What details does this template ask for? The form asks for 14 details, starting with Your name or business, Your address and contact, Customer, Customer's address, Invoice number. 1 more are optional. ### Can I download this template as Word or PDF? Yes. When you have filled in the form, save it as a Word document to keep editing, or as a PDF to send or print. It is free and needs no account. ### Is what I type sent anywhere? No. What you type stays in your browser while you fill in the document. It only goes to nerix if you choose to open the template in the chat. ### What should I check before I use this template? Rules on interest, fees, debt collection and the steps before going to court differ by country, and some require a particular notice or wait. Only claim what the contract or the law lets you claim, and check local rules before you act on this letter. ### Are these invoice and payment templates free? Yes. Each one is free to fill in and download as Word or PDF, with no account. ### What must an invoice include? Your details, the customer's details, an invoice number and date, a description of what was sold, the amount and how to pay. Tax rules differ by country, so add what your local rules require. ### How polite should a payment reminder be? Start friendly and factual, with the invoice number, amount and due date. Only move to firmer wording if the first reminder is ignored. ### Can I use these for a business in any country? Yes. The templates assume no country, and you enter your own currency, tax details and payment instructions. Templates ## More in Money and payments - [Acknowledgement of debt A signed note in which a person or company admits owing a sum and says how and when it will be paid. 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Money and payments](https://nerix.ai/templates/personal-loan-agreement) [See all Money and payments templates](https://nerix.ai/templates/money) Templates ## More kinds of documents Every category has its own page, so you can see all of its templates at once. ## Use it in nerix ### Use it in nerix - [Templates](https://nerix.ai/product/templates) - [Money](https://nerix.ai/product/money) - [The Sheet](https://nerix.ai/product/sheet) ### Learn more - [How to Make a Document From a Template](https://nerix.ai/help/make-a-document-from-a-template) - [Money and payments](https://nerix.ai/templates/money) ## Keep reading - [Documents and templates](https://nerix.ai/blog/category/documents-and-templates) October 21, 2026 5 min read ### [Formal letters that get a reply and a result](https://nerix.ai/blog/formal-letters-that-get-a-reply-and-a-result) How to write a formal business letter that gets a reply: the structure, the facts to include, how to ask for what you want, and when to send a demand letter. Read the guide - Sales and contracts invoices [Sales and contracts](https://nerix.ai/blog/category/sales-and-contracts) October 21, 2026 5 min read ### [Payment reminder emails that actually get you paid](https://nerix.ai/blog/payment-reminder-emails-that-get-paid) A payment reminder email template and the wording for each stage: when to send it, what to write, what to attach and when to move to a formal demand. Read the guide