What an employee ID number is, why you should not use Social Security numbers, simple numbering schemes, where IDs are used and how to keep them secure.
Names are not unique and change over time. An employee ID gives each person one stable identifier that connects their timesheets, schedules, pay records, training records, equipment and building access. It makes payroll exports reliable, helps avoid paying the wrong “J. Smith” and lets you search records quickly. You can generate numbers with our employee ID number generator and print badges with the employee ID card maker.
To record clock-ins, breaks and overtime automatically, see EZTime time and attendance software.
In the past many employers used Social Security numbers as employee IDs. Today that is a serious risk. SSNs are a key target for identity theft, and many states restrict how businesses may use or display them, for example on badges, time cards or in unsecured systems. The Social Security Administration and privacy regulators have long encouraged organizations to avoid using SSNs as identifiers.
Collect SSNs only where required, such as for payroll tax reporting and Form W-4, store them securely with restricted access and use a separate employee ID everywhere else.
| Scheme | Example | Pros | Cons |
|---|---|---|---|
| Sequential | 1001, 1002, 1003 | Simple, easy to issue | Reveals hiring order and headcount |
| Prefix + sequential | NYC-0042, CHI-0107 | Shows home location | Location may change; keep the number anyway |
| Year + sequential | 26-0158 | Shows hire year | Reveals tenure; slightly longer |
| Random numeric | 583920 | Reveals nothing | Needs a check for duplicates |
| System-generated | Assigned by HR or payroll software | Automatic and unique | Format may not match other systems |
For most small businesses, a simple sequential number, starting at a value like 1001 so all IDs have the same length, is the easiest choice. If you have several systems, decide which one is the “source of truth” for IDs and use the same number everywhere.
An employee ID identifies a person; it is not a password. If employees clock in at a kiosk by typing their ID, anyone who knows someone else’s number could clock in for them, which is one route to buddy punching. Pair IDs with a private PIN, a personal NFC tag, a photo capture or biometric verification, and do not print PINs on badges. See how to prevent buddy punching.
Employee IDs are less sensitive than SSNs, but they still connect to personal information. Limit who can see full employee records, avoid printing unnecessary personal details on badges, and remove access promptly when people leave. If you print photo ID badges, include only what is needed: name, photo, company and perhaps role or ID number. Consider whether the badge needs to show the ID at all if it is used only for access control.
If contractors, agency temps or volunteers need access to your systems or buildings, give them identifiers too, but use a different prefix or range so they are never confused with employees. This helps keep employment records clean and supports correct classification. See independent contractor vs. employee.
Employee IDs often break when a business changes systems or combines with another company. Two payroll systems may both have an employee 1001, or a new HR platform may assign its own numbers automatically. Before any migration, export a full list of current and former employees with their existing IDs, decide whether you will keep the old numbers or map them to new ones, and keep a cross-reference table so historical time and pay records can still be traced. After the change, spot-check a sample of employees across payroll, time tracking and HR to confirm that every record lines up. A few hours of planning prevents months of confusion when someone asks about pay from two years ago.
A landscaping company with 35 seasonal and year-round workers uses first names on a whiteboard and two employees named Luis share one payroll line by mistake for a pay period. The owner assigns four-digit IDs starting at 1001, retires numbers when people leave and gives returning seasonal workers their old number each spring. Payroll exports now match timesheets exactly, and the error does not happen again.
EZTime gives each employee a profile that links schedules, time records, documents and forms, and produces payroll-ready reports. Employees clock in from the mobile app, a tablet kiosk or an NFC tag, and access is removed when an employee is deactivated.
A unique number assigned by an employer to identify each employee across payroll, time tracking and HR systems.
It is strongly discouraged. SSNs are sensitive, and many states restrict how they may be used or displayed.
No. Retire numbers when people leave so historical records stay accurate; rehires can get their old number back.
A simple, fixed-length sequential number such as 1001 works for most small businesses.
No. An EIN identifies the business for tax purposes; an employee ID identifies an individual employee internally.
Yes, but pair the ID with a PIN or other verification to prevent buddy punching.
EZTime does not run payroll, but it exports payroll-ready reports to Excel and PDF so approved hours reach your payroll provider without retyping. Pricing starts at $2 per employee each month, with a $20 monthly minimum.