How to Split Publishing on a Co-Written Song (2026)

The song has 5 million streams. You wrote 50% of it. Your co-writer wrote 50%. But you registered the splits differently with your PRO. Now the organization cannot reconcile the registrations and nobody gets paid until the dispute is resolved. Meanwhile the streams keep accumulating.

This is not hypothetical. PRO disputes over mismatched co-write registrations are one of the most common reasons independent artists miss royalty payments. The fix is simple but only if you set everything up correctly before the song is released.

This guide explains how co-writing splits work, the 100% rule, what happens to the writer and publisher shares when there is more than one co-writer, when producers get publishing, and how to register everything correctly so the money actually flows.

Disclaimer: This is educational content, not legal advice. Consult a music attorney or music business professional for guidance on your specific situation.

What You Will Learn

• What publishing is and why it gets split between co-writers
• How the 100% rule works (and why it trips people up)
• The difference between writer share and publisher share
• When producers are entitled to publishing
• How to agree on splits before you start writing
• How to register with PROs correctly
• How mechanical royalties and sync fees follow the same split

What Publishing Is and Why It Gets Split

When a song is created, copyright law gives the creators two distinct assets:

1. The composition: the song itself (lyrics and melody). This is what publishing covers.
2. The master recording: the specific recorded version. This is separate from publishing.

Publishing income from the composition flows from three main sources:

• Performance royalties: paid by PROs (ASCAP, BMI, SESAC in the US; PRS in the UK; SOCAN in Canada; etc.) when the song is publicly performed, played on radio, streamed on certain platforms, or used in TV and film.
• Mechanical royalties: paid when the song is reproduced (streamed on demand, downloaded, pressed on vinyl or CD). In the US, these are collected by the MLC (Mechanical Licensing Collective) for digital uses.
• Sync licensing fees: paid when the song is licensed for use in film, TV, advertising, video games, or other visual media.

When multiple people write a song together, all of those income streams need to be split according to who owns what percentage of the composition.

The 100% Rule

Here is where confusion starts. Publishing splits follow a rule that feels simple but confuses people in practice: the total writer share is 100% and the total publisher share is 100%. These are two separate 100% pools.

In the US standard model, a PRO splits its total royalty pool roughly 50% to writers and 50% to publishers (the actual ratios vary by PRO and by deal type, but this is the general framework). So if your song earns $1,000 in performance royalties:

• $500 goes to the writers (split proportionally among all co-writers based on their writer shares)
• $500 goes to the publishers (split proportionally among all publishers based on their publisher shares)

If a co-writer is their own publisher (which is common for independent artists), they collect both their writer share and their publisher share of their portion.

Example with two co-writers, each self-publishing:

If Writer A signs with a publishing company, that publisher takes Writer A's publisher share (the $250), minus their admin fee or advance recoupment. Writer A still collects their writer share directly from the PRO.

Writer Share vs. Publisher Share in Practice

When you are an independent artist with no publishing deal, you own 100% of your copyright interest in the song: both your writer share and your publisher share. You register with your PRO both as a writer and as a publisher.

When you sign a publishing deal:

• Full publishing deal: you assign your entire publisher share to the publisher. You keep your writer share.
• Co-publishing deal: you assign 50% of your publisher share to the publisher, keeping the other 50%. You also keep your full writer share. See our guide on what a co-publishing deal is and whether it is worth it for more detail.
• Admin deal: the publisher collects and administers on your behalf but does not own any of your copyright. You keep everything; they take an admin fee (typically 10-20%).

For the purpose of co-write splits, what matters most is that all co-writers agree on the writer share percentages, because those are permanent and directly tied to how much you collect from performance royalties and mechanicals for the life of the copyright.

When Producers Get Publishing

This is the question that causes the most conflict in modern music.

A beatmaker or producer who creates the underlying instrumental track has a strong argument for a composition share because they contributed creative musical content (the arrangement, the harmonic structure, the melodic motifs in the production). A producer who appears on the session after the song is written and provides purely technical recording or mixing work does not.

In practice, here are the common models:

• Beatmaker provides the entire instrumental: the producer typically receives a composition share (often 25-50%, negotiated). This is standard in hip hop, R&B, and pop production.
• Producer writes the chord progression and arrangement with the songwriter: both share writing credit. The split depends on relative contribution.
• Producer provides a beat under a beat lease: the producer retains publishing rights to their composition unless the lease is converted to exclusive or a separate publishing deal is negotiated.
• Topline session: a producer builds a track specifically for a vocalist-songwriter. Both parties co-write and both share the composition.

The safest approach is to discuss publishing before the session begins, not after. "Are we splitting publishing equally or by contribution?" takes 30 seconds. "You should not get publishing for what you did" takes weeks to resolve.

How to Agree on Splits Before Writing

The conversation about splits should happen at the beginning of the collaboration, not at the end.

Equal split: All co-writers split the composition equally. If three people co-write, each gets 33.3%. This is administratively simple and avoids arguments about who contributed more. Many professional songwriters default to equal splits to keep relationships clean.

Contribution-based split: Co-writers negotiate percentages based on what they each brought. The person who wrote the hook and the chorus might receive more than the person who contributed a bridge. This approach is more accurate but requires a subjective conversation that can get tense.

Pre-session agreement: Some experienced writers sign a split sheet before they begin the session, agreeing to equal splits regardless of how the session goes. If one person ends up contributing more, they negotiate before signing, not after.

The split sheet is a simple document that records the agreed percentages. It is not a full collaboration agreement (though it can be part of one). For a full framework, see our guide on how to write a music collaboration agreement.

Sample split sheet:

Registering with PROs Correctly

Once you have agreed on splits, every co-writer needs to register the song with their PRO. This is where mismatched splits create problems.

The registration must match across all co-writers. If Writer A registers a 50/50 split with ASCAP and Writer B registers a 60/40 split with BMI, the PROs cannot reconcile the claim and payment may be held.

Steps for each co-writer:

1. Log into your PRO account (ASCAP, BMI, SESAC, or your national equivalent)
2. Register the song title, ISRC if available, and your co-writers' information
3. Enter your percentage of the composition exactly as agreed in the split sheet
4. List your co-writers' names and their PRO affiliations
5. Register both as a writer and as a publisher if you are self-publishing

ISRC codes: Each recording of a song gets a unique ISRC code. Your distributor assigns this. Register the ISRC with your PRO alongside the composition registration.

Multiple PROs: If Co-writer A is with ASCAP and Co-writer B is with BMI, both register separately with their respective organizations. ASCAP and BMI have reciprocal agreements and share data. Each writer will collect their respective share from their own PRO.

For international performance royalties, your PRO has reciprocal agreements with foreign societies. If your song gets played on UK radio and you are with ASCAP, PRS (the UK PRO) collects the UK performance royalties and remits them to ASCAP, which pays you your share.

Mechanicals and Sync Follow the Same Split

When your song earns mechanical royalties (from on-demand streams collected by the MLC in the US, or equivalent bodies in other countries), those royalties are split exactly according to the composition percentages in your split sheet.

In the US, the MLC collects mechanical royalties from streaming services and distributes them to rights holders. You register your song with the MLC separately from your PRO registration. If you use a publishing administration service like Songtrust, TuneCore Publishing, or Distrokid's publishing admin option, they handle MLC registration for you.

Sync licensing fees are also split according to composition percentages. If your song lands a $5,000 sync deal in a TV show, each co-writer receives their percentage of that $5,000 (less any publisher admin fees if applicable).

Use our Publishing Royalty Split Calculator to model different split scenarios and see how different percentage agreements affect each collaborator's share of revenue.

Common Disputes and How to Avoid Them

Verbal agreements on splits: "We agreed on 50/50" followed by "No, I said I wanted 60/40 because I wrote the chorus" is the most common co-write dispute. Fix: put it in writing before or during the session, not after.

Delayed split discussions: waiting until the song is mixed and mastered to talk about splits means everyone has more emotional investment in getting a better deal. Fix: discuss splits at the start.

"I just provided a vibe": vague contribution claims (someone who attended a session and contributed ideas without writing anything specific) should be addressed immediately. Fix: define contribution before the session begins.

Unregistered splits: one co-writer registers promptly and the other does not. The PRO cannot complete the record and may hold payment. Fix: establish a deadline by which all co-writers register their shares, tied to the release date of the song.

Frequently Asked Questions

Q: What if we cannot agree on the split percentages? A: If the discussion stalls, consider defaulting to an equal split. It is clean, simple, and preserves the creative relationship. The money lost from a slightly less favorable split is almost always less than the money (and time) lost to a dispute.

Q: Does the producer get publishing if they already got a flat fee? A: It depends on the agreement. A flat fee for production work (work-for-hire) typically means the producer waives any ownership claim. If no agreement was signed and the producer created creative musical content, they may have a legitimate publishing claim. Clarify this before recording starts.

Q: How do we split the publisher share if only one co-writer has a publishing deal? A: The publisher share is individual. If Writer A has a publishing deal, their publisher takes Writer A's publisher share. Writer B's publisher share is unaffected and goes to whoever holds Writer B's publishing rights (usually Writer B themselves if they are self-publishing).

Q: Can a co-writer sell their share of the composition? A: Yes. A co-writer can sell or assign their ownership interest in the composition. However, unless the collaboration agreement includes a right of first refusal clause, they can sell to anyone without notifying the other co-writers first. Adding a right of first refusal to your collaboration agreement prevents outside parties from buying into your song without your knowledge.

Q: We co-wrote a song two years ago and never registered it anywhere. Is it too late? A: You can register with your PRO at any time. You may be able to claim some backdated royalties depending on the PRO's lookback period. ASCAP, for example, has specific rules about claims for historical performances. Contact your PRO directly to understand what is recoverable.

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Agree on the split today, before the session starts. Sign a split sheet, even a handwritten one. Then register with your PRO before the release date. Those three steps will save you from the most common and most expensive problem in independent music collaboration. If you want to understand how those royalties actually flow once the song is out, our guide on all the music royalties you should be collecting covers the full picture.