The foundation is site-level time tracking. Guards need to clock in and out of each specific client location, not just log a total shift. Mobile time tracking apps with GPS verification or geofencing work well for this because they confirm the guard is physically at the assigned site when they punch in. Some companies use QR codes posted at each location or biometric kiosks for higher-security contracts. The method matters less than the result: every hour gets tied to a specific client site automatically, with no manual sorting after the fact.

Those tracked hours serve two purposes at once. They drive payroll, and they feed your job costing. Each client contract should be set up as a separate job or project in your accounting software. When a guard logs 8 hours at Building A on Monday and 10 hours at Building B on Tuesday, those hours land in the correct job for costing and on the correct payroll record for payment. If you’re doing this manually with paper timesheets and spreadsheets, hours get miscoded or lost. Digital time tracking that syncs with your payroll and accounting system eliminates most of that error.

Overtime is where things get complicated and expensive. New York requires 1.5x pay for any hours over 40 in a week. A guard who works 25 hours at one client site and 20 hours at another has crossed into overtime for that last 5 hours. The question becomes which client account absorbs the overtime premium. There are different approaches. Some companies allocate the OT cost to whichever site the guard was working when they crossed 40 hours. Others spread it proportionally across all sites where the guard worked that week. Pick a method, apply it consistently, and make sure your billing rates account for the real cost of overtime, not just straight-time rates.

This is especially important because overtime can quietly destroy margins on what looks like a profitable contract. If you’re billing a client $28 per hour based on a $20 base wage, that margin looks healthy. But if guards regularly hit overtime on that account, your actual labor cost is $30 per hour and you’re losing money. You won’t see this unless your job costing captures the overtime premium at the account level.

Margin per account visibility is the whole point of tracking this way. With hours and costs flowing to each client job, you can pull reports showing revenue minus labor cost for every contract. You’ll quickly see which accounts are profitable and which ones need rate renegotiation or staffing adjustments. Facility service companies that skip this step often discover too late that their largest client is actually their least profitable one.

Reconciling billed hours against actual hours worked is the other critical piece. Your billing to clients should tie back to the same time records driving payroll. If a guard clocks 42 hours at a site but you only bill 40, that’s revenue leakage. If you bill 45 but the guard only worked 42, that’s a client dispute waiting to happen. A clean time tracking system gives you one source of truth for both payroll and invoicing.

For companies running guards across multiple sites in the Bronx and across NYC, the payroll and job costing complexity adds up fast. Working with Bronx bookkeeping services that understand labor-heavy operations means your chart of accounts, payroll setup, and reporting are built to surface the numbers that actually matter for running a security company profitably.