The Multiple Listing Service (MLS) is the central database where real estate agents share property listings. When a home is listed on the MLS, it becomes accessible to all member agents and is syndicated to consumer sites like Zillow, Redfin, and Realtor.com within 24–48 hours.
How the MLS Works
The US has approximately 580 regional MLS systems, most affiliated with the National Association of Realtors (NAR). Each regional MLS covers a specific geographic area — there are separate MLS systems for metro areas, counties, and states.
The flow of a listing:
- Seller hires a listing agent
- Listing agent enters the property into the regional MLS with photos, price, details
- All member agents in the region can see and share the listing
- MLS feeds data to Zillow, Redfin, Realtor.com (aggregators)
- Consumers browse listings on those platforms
- Buyer’s agent submits an offer through the seller’s agent
- Once under contract, status changes to “Pending” in MLS
- After closing, sold data feeds into historical comps
MLS vs Consumer Sites
| Feature | MLS | Zillow / Redfin / Realtor.com |
|---|---|---|
| Who has access | Licensed agent members | General public |
| Data freshness | Immediate | 24–48 hour delay (typically) |
| Data completeness | All fields including agent notes | Consumer-facing fields only |
| Listing history | Full | Partial |
| Off-market / expired listings | Yes | Varies |
| Accuracy | Source of truth | Dependent on MLS feed quality |
How to List on the MLS as a For Sale By Owner
Homeowners cannot directly submit listings to the MLS — only licensed, member agents can. If you want MLS exposure without a full-service agent, flat-fee MLS services allow this:
| Option | Cost | What You Get |
|---|---|---|
| Flat-fee MLS service | $300–$1,000 one-time | MLS listing + Zillow/Redfin syndication; you handle showings, offers, negotiations |
| Limited service agent | $500–$1,500 | MLS listing + some support |
| Full-service listing agent | 2%–3% of sale price | Full representation, marketing, negotiation |
Flat-fee MLS is best for sellers who are experienced, have time to manage the transaction, and want to maximize savings on the listing side while still offering buyer agent compensation.
What the 2024 NAR Settlement Changed About the MLS
Before August 17, 2024, every MLS listing included a field showing the buyer agent compensation the seller was offering (e.g., “2.5% BAC”). This was removed as part of the NAR settlement:
| Change | Before Aug 2024 | After Aug 2024 |
|---|---|---|
| Buyer agent compensation in MLS | Required field visible to all | Prohibited from MLS listings |
| How sellers offer BAC | In MLS | Via purchase agreement, direct negotiation, marketing materials |
| Buyer representation agreement | Not required before touring | Required before touring |
The practical effect: sellers and their agents communicate buyer agent compensation directly rather than through MLS data fields. Many sellers still offer buyer agent compensation — they just can’t post it in the MLS listing.
MLS Data as the Basis for Comps
One of the most important functions of the MLS beyond marketing is its historical sales database. Appraisers and agents use MLS sold data to generate:
- Comparative market analyses (CMAs) for pricing listings
- Appraisals for mortgage lenders
- Automated valuations (Zillow Zestimate, Redfin Estimate)
This data includes sale price, days on market, price reductions, and property features — making the MLS the most accurate and comprehensive source of real estate market data in the US.
The MLS is the primary data source for real estate comps — agents use it to find comparable sales when setting and evaluating prices. Buyers can access MLS listings through Zillow and Realtor.com, but working with a licensed agent gives direct access to all listing data. For sellers, real estate commission changes explains how the 2024 NAR settlement changed buyer-agent compensation and MLS access rules.
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