HR & HCM · People & Workplace
Should you build or buy Time & Attendance?
Time and attendance software captures when employees work — via timesheets, clock-in systems, or biometric devices — calculates hours against overtime and pay rules, and feeds that data to payroll. HR and operations teams use it to enforce scheduling policies, track PTO and leave balances, and maintain the records that FLSA and state wage laws require.
The build-vs-buy decision for time and attendance turns on how complex your pay rules and compliance surface are — a simple salaried workforce in one state is a very different problem from an hourly workforce with union rules across multiple jurisdictions; the specifics of your workforce type and compliance requirements decide it.
Build it, buy it, or bridge?
When building makes sense
Time and attendance sits in an interesting middle ground. The core scope — clock-in/out, overtime calculation, PTO tracking, payroll handoff — is genuinely buildable. TimeTrex is open-source and runs in production with real compliance requirements; Odoo Attendance handles basic timekeeping in ERPNext deployments. For a single-jurisdiction employer with a primarily salaried workforce and straightforward pay rules, the custom build is a reasonable conversation. AI-assisted development has also compressed the time to get a functional timesheet and overtime calculation to weeks rather than months. The build case gets most compelling when your workforce is small, your pay rules are simple, and you'd rather own the data model than pay $5 to $15 per employee per month indefinitely — especially when that per-seat cost scales up painfully with headcount growth.
When buying makes sense
Where buying earns its keep is the compliance surface that compounds with scale. Multi-state overtime rules, FLSA record-keeping requirements, union shift differentials, biometric hardware protocols, and real-time payroll integration turn a simple timesheet into a compliance system. Tools like UKG and Deputy have absorbed that complexity across thousands of customer deployments, including the ongoing updates as fair workweek laws spread to new cities and states. The 15 to 25 percent annual maintenance cost for a custom T&A build — updating for new state laws, fixing payroll integration breaks, and maintaining biometric device drivers — is the often-underestimated cost that makes vendor economics look more attractive over a three to five year horizon than the initial build estimate suggests.
The desk read
Time and attendance sits in an interesting middle ground. The core scope, clock-in and clock-out, overtime calculation, PTO tracking, payroll handoff, is genuinely buildable. TimeTrex and Odoo Attendance run in production environments with real compliance requirements. For a single-jurisdiction employer with a salaried workforce and a straightforward payroll setup, the custom build is a reasonable conversation.
Where buying earns its keep is the compliance surface that compounds with scale. Multi-state overtime rules, FLSA record-keeping requirements, union shift differentials, and biometric hardware protocols turn a simple timesheet into a compliance system. Tools like UKG and Deputy have absorbed that complexity across thousands of customer deployments. The build case gets serious when your workforce is small, your pay rules are simple, and you'd rather own the data model than pay $5 to $15 per employee per month indefinitely.
Frequently asked
What is time and attendance software?
Time and attendance software captures when employees work, calculates hours against overtime and pay rules, and feeds that data to payroll. HR and operations teams use it to enforce scheduling policies, track PTO and leave balances, and maintain the records that FLSA and state wage laws require.
When does building time and attendance software make sense?
Building makes sense for simpler scenarios — single jurisdiction, salaried workforce, straightforward pay rules. Open-source options like TimeTrex and Odoo Attendance handle core timekeeping in production environments and can be a solid foundation if your compliance surface is manageable.
When does buying time and attendance software make sense?
Buying makes sense for hourly workforces with multi-state overtime rules, union contracts, or biometric hardware requirements. The compliance maintenance for those scenarios adds 15–25% annually to a custom build's cost, which often makes vendor economics more favorable over a multi-year horizon.
What are the main time and attendance vendors?
Representative vendors include UKG (Kronos), Deputy, TSheets (QuickBooks Time), When I Work. B4 Pro scores the full set.