I’ve been the person who fell in love with an obscure memoir, searched every shelf at my local branch, and assumed that was the end of the road. It wasn’t. Interlibrary loan (often shortened to ILL) is the service that turns that dead end into a new chapter. In this guide, I’ll walk you through exactly how interlibrary loan works for getting books your library doesn’t have, what to expect on timelines and costs, and the small etiquette tips that make the process smoother for you and the librarians helping you.
Table of Contents
What Is Interlibrary Loan?
Interlibrary loan is a library service that lets you borrow books, articles, microfilm, and other materials from a library other than your own when your local library doesn’t own a copy. According to the Interlibrary Loan Code for the United States, it’s the formal process by which a library requests material from, or supplies material to, another library.
The system is coordinated through massive cooperative networks, most notably OCLC (Online Computer Library Center) and its WorldCat catalog, which lists holdings from thousands of libraries worldwide. When your library can’t fill a request, ILL helps them locate a partner library that can. For patrons, this means your single library card can quietly unlock access to millions of titles, including out-of-print books, niche research, and special collection items.
How ILL Differs From Regular Library Borrowing
Walking into your local branch and grabbing a book off the shelf is instant. Interlibrary loan is closer to a courier service than a casual checkout. The book still arrives at your library for pickup, but it travels from a lending library in another city, state, or sometimes country.
Because the item belongs to another library, there are some practical differences. Loan periods are often shorter (commonly 3 to 4 weeks instead of 2 to 3). Renewals are possible but go through the lending library, not yours. Late fees still apply if you miss the due date, and the cost of replacing a lost ILL item can be significantly higher because you’re paying the lending library’s replacement cost, not your local system’s.
How Interlibrary Loan Works: Step by Step
Here’s the actual process, from your first search to the moment you slide the book back across the return counter. Most libraries follow a similar workflow, though the exact system (often ILLiad, Tipasa, or a simpler web form) varies.
Search your library’s catalog first. Confirm the item isn’t already in your local system or available as an ebook or audiobook through apps like Libby or Hoopla. ILL is for items your library genuinely cannot provide.
Submit an ILL request through your library. Most libraries have a form in their catalog, a dedicated ILL portal, or a staff member who takes requests by phone, email, or in person. Provide the title, author, ISBN or edition if you know it, and any deadline you’re working against.
Your library searches partner networks. Librarians use OCLC/WorldCat and regional consortia to find a library that owns the item and is willing to lend it. For popular titles, multiple libraries may compete to fill the request.
The lending library ships the item. Books arrive through the mail (often via postal or courier service), while articles and book chapters frequently arrive electronically as PDFs within days.
You get a pickup notification. Your library will email, text, or call when the item is ready, usually at your home branch’s circulation desk.
Check it out like a normal book. Bring your library card. You’ll get a due date written on a band around the book or inside the cover.
Return it on time to your library, not directly to the lender. Your library handles shipping the item back to the lending library.
I love how quiet this whole choreography is. From the patron’s perspective, you fill out a form, wait a bit, and pick up a book. Behind the scenes, librarians are fielding dozens of these requests every day.
What Can You Request Through Interlibrary Loan?
Most ILL programs can borrow books, audiovisual materials, and microfilm, and many can deliver copies of journal articles and book chapters electronically. Some libraries also request theses, government documents, and music scores. What’s available depends on your library’s network and what other libraries are willing to lend.
Common requests include out-of-print books, niche research titles, foreign-language materials, and special collection items like rare regional history or archival documents. Many libraries can also request items in formats like large print, audiobook CD, or DVD when those formats exist in the lending collection.
How Long Does Interlibrary Loan Take?
The honest answer is: it depends. A common range is 5 to 14 days for a book, with articles often arriving in 1 to 5 days through electronic delivery. International requests can stretch to 3 to 6 weeks, especially if the item needs to cross multiple customs checkpoints or comes from a smaller library with infrequent shipping days.
The main disadvantage of interlibrary loan is this very unpredictability. Unlike walking into a branch and walking out with a book in hand, you’re waiting on a courier and a stranger’s library schedule. Popular textbooks, new bestsellers, and best-selling audiobooks are sometimes harder to borrow because every other library wants the same copies. If you need something urgently, tell your librarian when you submit the request. They can flag it as rush or look for faster electronic alternatives.
Is Interlibrary Loan Free?
For most patrons, yes. The vast majority of public and academic libraries offer ILL at no charge to their cardholders. The cost is absorbed by the library through their network memberships and operating budgets. A small number of libraries charge a nominal fee for specific high-cost requests (for example, an extensive photocopy job or an international loan), but this is the exception, not the rule.
If fees ever apply, your library will tell you before processing the request. You typically won’t be surprised at the desk. When in doubt, ask when you submit your ILL form: “Are there any fees I should know about?”
Copyright and the Rule of 5
Libraries operate under copyright law when filling ILL requests, and the most cited guideline is what’s often called the “Rule of 5.” Under the CONTU (National Commission on New Technological Uses of Copyrighted Works) guidelines, a library may borrow up to five articles from a single journal title in a calendar year without paying royalties. After the fifth article from the same journal, the library must either get permission from the copyright holder or pay a royalty fee.
For books, libraries generally honor in-copyright lending limits set by publishers. Some recent bestsellers and high-demand textbooks are restricted by publishers from being lent through ILL, which is why some requests come back unfilled. Older, out-of-print books are usually easier to borrow because copyright complications are simpler. If your request is denied for copyright reasons, your librarian can often suggest a purchase request instead.
Tips for Faster ILL Requests
A few small habits make ILL work better for you and the librarians processing your requests. Be specific with titles, authors, editions, and ISBNs when you can find them. Vague requests take longer to verify, and an ILL team might fill the wrong edition while you wait.
Tell your library if your need is tied to a deadline, like a class assignment or travel. They’ll prioritize rush options when possible. If your first request is unfilled because no library is willing to lend, don’t give up. Ask your librarian to broaden the search to include more lenders or older editions. And if you finish an ILL book early, return it promptly. The faster it gets back to the lending library, the more goodwill your home library builds in the network, which can pay off the next time you need something rare.
A note for heavy users: ILL is meant to be used. Librarians don’t think of ILL requests as bothersome. The whole system exists because libraries want to extend what they can offer. If you’re requesting a book every week, you’re using the service exactly as designed.
Interlibrary Loan vs. Purchase Request
If your library doesn’t own a book, you usually have two options: request it through ILL or ask the library to buy a copy. ILL is best when you need the book soon, want to borrow it temporarily, or are researching a niche topic you may not revisit. A purchase request is better when the title has long-term relevance to the collection, when other patrons might also want it, or when the book is unavailable through ILL because of copyright restrictions.
Some libraries let you submit a purchase suggestion online, and acquisitions staff review requests regularly. You may end up on a waiting list for popular new releases, but for a title with a clear gap in the collection, libraries are often grateful for the recommendation. If ILL fails for a book you really need, a purchase request is the natural next step.
Frequently Asked Questions
What is the main disadvantage of Interlibrary Loan?
The main disadvantage is speed. Unlike walking into a branch and grabbing a book, ILL depends on another library shipping the item, so requests typically take 5 to 14 days for books and even longer for international materials.
Is an Interlibrary Loan a way to get books and articles from other libraries?
Yes. Interlibrary loan is the formal service libraries use to borrow books, articles, microfilm, and other materials from partner libraries when they don’t own a copy themselves.
What is the Interlibrary Loan rule of 5?
The Rule of 5 refers to CONTU guidelines that allow a library to borrow up to five articles from a single journal title in a calendar year without paying royalties. After that, the library must seek copyright permission or pay a royalty fee.
How long does Interlibrary Loan take?
Books usually arrive in 5 to 14 days. Articles and book chapters delivered electronically often arrive in 1 to 5 days. International requests can take 3 to 6 weeks.
Is the Interlibrary Loan free?
For most patrons, yes. Most public and academic libraries absorb ILL costs through their operating budgets, so there is no charge to the cardholder. Some libraries charge fees for specific high-cost requests, and they will tell you in advance.
Can you do an Interlibrary Loan on Libby?
Libby and Hoopla provide instant access to digital books your library already licenses. They don’t directly support interlibrary loan between libraries. If an ebook is unavailable in Libby, your library’s ILL service may still be able to request a digital copy from another library.
Can I request any book through Interlibrary Loan?
Almost any book that exists in a lending library’s collection. Some publishers restrict ILL lending for in-demand bestsellers and textbooks, and copyright rules can limit certain articles, but most books are fair game.
Do authors make money from library loans?
Not directly from ILL transactions. However, many countries have Public Lending Right programs that pay authors a small royalty based on how often their books are borrowed through libraries, including ILL loans.
The Bottom Line
Now that you know how interlibrary loan works for getting books your library doesn’t have, the service stops feeling mysterious. Submit a clear request, give it a couple of weeks, and pick up your book at the desk like any other checkout. If your library can’t fill the request, ask about a purchase suggestion or an electronic alternative. With interlibrary loan, the world of library collections is genuinely at your fingertips, no matter how small your home branch.