One extra zero in a list price is easy to miss at nine at night and impossible to miss once the listing is public. That is the usual life of an MLS data entry error: quick to make and slow to clean up.
When a remote assistant keys your listings, the quality comes from the checking routine, because typing speed catches nothing. Make sure the routine is written down before the first listing. Your state's licensing rules and your MLS's rulebook decide whether an assistant may enter or change listings at all, so ask your MLS what kind of login an assistant can have, and keep your own login to yourself.
Understanding MLS Data Entry Errors
A listing in the MLS (multiple listing service) is a record made of fields. Other agents search those fields, the portals and websites that receive the MLS feed show them, and a year from now a CMA will use the sale as a comp. A small error in one field travels a long way.
What are MLS Data Entry Errors?
An MLS data entry error is any field that does not match the home, the listing agreement or the MLS's own rules. It might be a wrong number, a wrong status, a value typed in the wrong field or a field left empty.
Some errors are visible at a glance, like a price with the wrong number of zeros. Others often sit quietly in the record for months, like a bathroom count that nobody reads until a buyer's agent asks.
Why Do They Occur?
Most errors have ordinary causes, and they usually repeat:
- Re-keying. The same facts come from the listing agreement, the seller's form and the county record, and each retyping is a chance to slip.
- Assumptions. A figure copied from the home's last listing or from a similar house nearby looks right and goes unchecked.
- Picklists. An MLS may define a field in a way the assistant does not expect, such as what counts as a bedroom or a full bath.
- Late changes. The seller moves the showing hours or drops the price, and the change reaches the agent but not the person who keys the listing.
- Distance. A remote assistant has never walked the house, so every fact has to come from a document or from the agent, and a question sent at night waits until morning.
- No second check. A person who reads back their own typing sees what they meant to write.
Training closes some of those gaps. Walk your assistant through the MLS's own rulebook and field definitions before the first listing, and ask your MLS whether it runs classes for new users. A new assistant needs a few listings to get up to speed, with the agent reviewing each one.
Types of MLS Data Entry Errors
Errors fall into three groups: wrong values, misplaced or missing values, and formatting slips. Each group has its own check.
Incorrect Information
A wrong value usually starts with a number nobody checked. The table lists the fields that go wrong most and the document to trust for each one:
| Field | Source to trust | What goes wrong |
|---|---|---|
| List price | Signed listing agreement | A digit added or dropped, or an old price kept after a change |
| Status | The contract and the agent | A home still shown as active after an accepted offer |
| Living area | County record and the seller's measurements | The two disagree and nobody names the source |
| Bedrooms and baths | The agent's walk-through and the photos | A room counted as a bedroom because the seller calls it one |
| Lot size | County record or survey | Square feet entered in an acres field |
| Taxes and association fees | Tax bill and association statement | Last year's figure, or a monthly fee entered as annual |
Say the seller's papers show 2,100 square feet and the county record shows 1,850. The assistant enters neither on faith. The gap goes to the agent, who decides which figure goes in and which source to name, and if your MLS has a field for the source of the measurement, it gets filled.
Misplaced or Missing Data
Public remarks can be read by anyone who can see the listing, and agent-only remarks cannot. A lockbox code or a seller's phone number typed into the wrong box is out for everyone to see until someone catches it. Private details belong only in the fields your MLS marks as agent-only.
Blanks cause quieter trouble. A home with an empty garage field can drop out of any buyer search that filters on garage spaces.
Formatting and Syntax Errors
Formatting slips are small, but they break things. A price typed with a stray decimal point shows a number no buyer believes. An address abbreviated in an unusual way can fail to match the county record or put the map pin in the wrong spot. Symbols, all-caps remarks and phone numbers in places where the MLS bans them can get the listing flagged.
Your MLS's rulebook lists what is allowed in each field. Print that page for the assistant.
Impact of MLS Data Entry Errors
An error is a problem for the listing agent first, because the record carries the agent's name. Buyers and sellers feel it next.
On Real Estate Professionals
The listing agent answers for the listing, whoever typed it, and your MLS's rulebook sets out the penalties for a violation. A buyer who relied on the wrong square footage may complain to the broker, and the broker has to sort it out. Say a buyer writes an offer on 2,100 square feet and the appraiser measures 1,850: the argument that follows starts with the listing.
Speed matters when a mistake is found. NAR's Code of Ethics asks members to take prompt corrective action when information on their website turns out to be out of date or wrong (Standard of Practice 12-8). Treat the MLS record the same way, and log each fix: what was wrong, how it got in and what changed in the routine.
On Buyers and Sellers
Buyers lose time. A wrong bedroom count sends buyers to a house that does not fit them, and a missing field can hide a good fit from a buyer who never sees it.
Sellers lose exposure. A home shown as pending after the contract fell through can drop out of searches that filter for active listings, and a price that is wrong by one digit brings the wrong calls or none.
Preventing MLS Data Entry Errors
In a one-person office, a listing is checked once, by the person who typed it. In an office with an assistant and a reviewing agent, the same listing is checked by two people. Prevention is a routine with three parts: a source for every number, a second pair of eyes and a look at the live listing.
Best Practices for Accurate Data Entry
- Work from documents. The listing agreement, the seller's disclosure and the county record are the sources, and a data sheet notes which one each number came from.
- Use one listing data sheet whose fields follow the MLS entry screens in the same order.
- Have the agent approve the filled-in sheet before anything is entered.
- Use the MLS's preview, if it has one, and read the entry against the sheet field by field, out loud.
- Within a business day of going live, open the public view and compare it with the sheet.
- Keep track of every correction in a short log, so each mistake improves the routine.
Status changes need their own rule. Your rulebook sets the deadline for reporting a change such as an accepted offer, and the assistant's calendar should match it. Deadlines can differ depending on the kind of change, so the calendar needs one line for each.
Tools and Resources for Error Prevention
Most of the useful tools are already within reach. The MLS's own required fields and picklists catch some errors at entry. County assessor sites confirm ownership, parcel numbers and recorded square footage. A shared spreadsheet or form works as the data sheet, and the MLS support desk can explain a field definition faster than guessing.
For the first month, the agent reviews every entry, and the assistant should expect a learning curve. After that, a weekly sample of two or three listings keeps the habit alive. If your MLS can fill fields from public records, treat the result as a draft and check it, because a filled field looks right whether it is or not.
Pick the three errors above that would cost you most, turn each into a line on your data sheet, and ask your assistant to run the sheet against the first live listing before you approve it.