The Agency Worker's Guide to Timesheet Compliance and Records

Agency workers occupy a strange middle ground in the workforce. They're employed by a staffing agency, but they work on-site for a client, under managers who don't officially employ them. That triangular relationship — worker, agency, client — creates timesheet headaches that don't exist with direct employees.

This guide to agency worker timesheet compliance walks you through the practicalities of managing hours when three parties need to be happy, paid, or legally protected (ideally all three).

The core structural problem: the party writing the paycheque (the agency) is not the party watching the worker clock in and out (the client). So timesheet data has to move between two organisations, and both of them need to trust it. Get this right, and you've solved one of staffing's biggest admin problems. Get it wrong, and you're managing disputes, chasing approvals, and explaining to workers why their pay is short.

The triangular relationship: who does what

Three parties. Three different interests.

The agency

As the official employer (or engagement partner), the agency:

Pays the worker based on submitted and approved hours
Invoices the client for time worked at the agreed rate
Keeps employment records, including time records and payroll data
Ensures compliance with working time rules (like the UK's Working Time Regulations 1998, which set maximum weekly hours and rest entitlements)

The client

The client directs the day-to-day work and site management. They:

Schedule the worker and manage daily attendance
Approve or verify hours worked on their site
Ensure the worker is treated fairly under local regulations (like the Agency Workers Regulations 2010, which give agency workers equal treatment rights after 12 weeks in the UK)
Flag issues back to the agency if there are concerns about performance, attendance, or working conditions

The worker

The worker:

Records their hours accurately and promptly
Submits timesheets on time and in full
Reports issues with schedule, pay, or working conditions to the agency

The friction point is obvious: the agency can't pay accurately without verified data from the client. The client can't approve the invoice without trusting the underlying hours. The worker is caught in the middle, hoping both organisations agree on what happened. If they don't, the worker's pay gets delayed while you sort it out.

Why agency worker timesheets are worth getting right

Pay accuracy is a fairness issue

Agency workers earn hourly rates. One missing hour on a timesheet means one hour's pay doesn't arrive. So accuracy isn't just a financial detail — it's an immediate fairness issue. Workers notice. They talk. And if they feel they're being underpaid because of sloppy timesheets, they leave for another agency.

Invoicing disputes damage client relationships

When your timesheet shows 160 hours and the client remembers 155, you have a fight. The client feels overcharged. You feel they're being unreasonable. Neither of you has time for this. Disputed invoices delay cash flow, create friction, and make it less likely the client will place more workers with you. In a competitive staffing market, that's expensive.

Compliance depends on records

Employment regulations — in most jurisdictions — require time records for all workers, agency or not. If you can't produce accurate, complete records, you're exposed to regulatory action. Timesheet compliance and records you keep for minimum wage and working time are evidence that you followed the rules on pay, working hours, and breaks. Without them, you're betting on regulators believing your version of events.

Working time limits need a consolidated view

Here's one that catches people: an agency worker might be under the weekly maximum at Client A and also under it at Client B, but when you add them together, they're over the legal limit. You need a consolidated view of hours across every assignment to catch this before it becomes a breach. The client only sees their site; they can't spot it. That responsibility falls to you, the agency.

The approaches that work (and why some don't)

Paper timesheets with client sign-off

Traditional method: worker fills in a paper form by hand, client supervisor signs it, worker posts or hands it to the agency. Agency uses it to calculate pay and invoices the client.

The problems: Paper is slow. It's error-prone — handwriting gets misread, numbers get transposed, sheets get lost in transit. By the time the signed sheet reaches you, the hours were worked days or weeks ago. You have no real-time visibility into whether a worker showed up, how long they actually worked, or whether anything unusual happened. And good luck tracking down that original sheet if there's a dispute six months later. It's still in a filing cabinet, if it hasn't been thrown away.

Client system access

Some clients give agency workers login credentials to the client's own timesheet platform. Workers clock in and out alongside direct employees. The client then exports data and sends it to the agency (or you log in and download it yourself).

The catch: You're now dependent on your client for your own payroll and invoicing data. If they're slow to export, or if the format is incompatible with your systems, you hit delays and workarounds. You also have no control over how they define working hours, what counts as a break, or what "approved" means. And if they change their system or deprecate access, you're stuck.

Agency-provided system (the approach that scales)

The agency runs its own timesheet or workforce management platform. Workers use it regardless of which client they're assigned to. Clients approve hours through the same platform or a web-based approval portal. The agency maintains the definitive, centralised record.

Why this works: You control the process from end to end. Workers use the same system for every assignment — no learning curve at each new client. You get real-time data for payroll, invoicing, and compliance checks. You own the records. No dependency on clients to export data in the right format at the right time. And because the data is centralised, you can spot patterns: which sites are slow to approve, which workers have unusual patterns, which clients frequently dispute hours.

If you're serious about staffing at scale, this is the model. Tools like Relentify's timesheet system are built for this: mobile clock-in, automatic client approval workflows, multi-site tracking, and compliance checks built in.

Building a process that works

Step 1: Write the process into the client contract

Before you place a worker, agree with the client on how timesheets will be managed:

Which system you'll use (yours, theirs, or hybrid)
Who approves hours and within what timeframe (e.g., within 48 hours of the end of the working week)
What happens if hours are disputed and who resolves it
Whether GPS or location verification is required
How breaks and travel time are handled

Put it in writing. This prevents confusion and protects both parties. If you run into a dispute later, you have a reference point.

Step 2: Set up sites and assign workers correctly

In your timesheet system, create a record for each client site:

Site name and location
Primary contact for timesheet approvals
Standard shift pattern, start/end times, and break rules
Any site-specific requirements (security badge timing, specific clock-in location, etc.)

Assign each worker to the correct site so their timesheets automatically route to the right approver. One misassignment and timesheets land with the wrong person, causing delays.

Step 3: Train workers on their first day

Agency workers move between assignments and sites frequently, which means they encounter different systems and processes at each placement. Spend five minutes on Day One explaining how this specific client's timesheet process works. How to clock in. How to record breaks. How to submit. Keep it simple — they'll get it, and you'll prevent half of the data-entry errors that crop up later.

Step 4: Implement dual approval where it's high-value

Consider a two-step approval process:

Client supervisor verifies hours on-site (they see who clocked in, how long they stayed)
Agency admin reviews and gives final approval (they know the contract rate, working time rules, any special arrangements)

Each party catches errors the other might miss. The cost is minimal extra process. The benefit is fewer disputes and faster resolution.

Step 5: Maintain a centralised record

Regardless of how you collect data initially, keep a centralised master record of all hours worked by all agency workers:

Searchable by worker, client, date range, site
Retained for the legally required period (typically 2 years minimum; check your jurisdiction)
Available for audit by the worker, the client, or regulatory bodies
Flagging any potential breaches of working time rules

This is your evidence that you ran a compliant operation. It's also invaluable if a dispute arises — you have the source of truth.

Common issues and how to solve them

Disputed hours

Client says 40 hours; worker submitted 42. Common causes:

Worker arrived early or left late (and recorded it; client didn't)
Breaks were taken but not recorded (or recorded but client didn't confirm)
Confusion about whether travel time between sites counts

A GPS-verified timesheet removes ambiguity. The worker clocked in at a specific location at a specific time — the client has to argue with GPS data, not with interpretation. Disputes resolve faster.

Approvals are slow

Client takes five days to approve. Your payroll can't run. Set clear expectations in the contract and follow up. Many modern timesheet systems send automatic reminders to approvers if hours haven't been signed off by a deadline. That simple automation can prevent days of back-and-forth.

Workers split time across multiple sites in one day

Some agency workers work at Client A in the morning and Client B in the afternoon. Your system must capture time at each site separately so invoicing and records reflect which client they worked for and for how long.

Working time limits across multiple assignments

A worker might stay under the weekly maximum at each site individually, but exceed it when hours from all sites are combined. This is your problem to spot and solve. Use overtime tracking and calculations in your timesheet system to flag when a worker is approaching limits across all assignments.

Rounding and the rules

Some timesheet systems round times to the nearest 15 minutes. This is allowed in some jurisdictions under specific conditions (usually if it's done fairly over time), but not in others. Understand your local rules before you implement rounding. This guide to timesheet rounding rules and employment law covers the nuances for different regions.

Why this matters to your business

For a staffing agency, timesheet management isn't a back-office task — it's a core process that touches payroll, invoicing, compliance, worker satisfaction, and client relationships.

Accurate timesheets mean accurate pay (worker satisfaction and retention), accurate invoices (cash flow and client trust), and accurate records (compliance and audit readiness). They also mean fewer disputes, faster approvals, and less time spent chasing data.

Inaccurate timesheets do the opposite: they create disputes, delay payments, erode margins, and expose you to regulatory risk.

Investing in a solid timesheet process — supported by clear contracts with clients, training for workers, and the right technology — is one of the highest-return operational improvements a staffing agency can make. It reduces admin overhead, improves worker retention, strengthens client partnerships, and protects the business from compliance failures.

The complexity of the three-way relationship will always be there. But with the right process, it becomes manageable — and the data it produces becomes a competitive advantage rather than an administrative burden.

Frequently Asked Questions

Q: Who is legally responsible if an agency worker exceeds working time limits?

A: In the UK, the agency (the employer) is responsible for ensuring workers don't breach the Working Time Regulations 1998. This is why you need consolidated records across all assignments — you need to see the full picture of hours. The client can help by approving hours promptly and flagging concerns, but the compliance responsibility rests with the employer (you).

Q: Can we use the client's timesheet system instead of running our own?

A: You can, but it creates a dependency. You'll need a clear agreement on how data is shared, in what format, and how quickly. Ideally, negotiate this before you place the first worker. But if the client's system is slow, incompatible with your payroll software, or changes frequently, you'll wish you'd built your own.

Q: What should we do if a worker disputes their timesheet?

A: The worker should report the discrepancy promptly — ideally the same week. A centralised record and GPS verification help settle disputes quickly and fairly. For complex cases, document your dispute resolution process in your contract or terms. Have a clear escalation path: worker → supervisor → agency manager → formal review if needed.

Q: How long must we retain timesheet records?

A: In the UK, at least 2 years from the date the work was done. Some industries or jurisdictions require longer. Check your local requirements and your client contracts. When in doubt, keep records for at least 3 years.

Q: Are agency workers entitled to the same breaks and rest periods as direct employees?

A: In the UK, yes — after 12 weeks under the Agency Workers Regulations 2010. In other regions, rules vary. The key point: accurate time records are evidence that you're meeting these obligations. Your timesheet system should flag working time issues (excessive hours, insufficient rest) automatically.

Q: Can we use GPS or biometric verification for agency worker timesheets?

A: Yes, as long as you're transparent about it, use it consistently across all workers, and comply with data protection regulations. GPS can be very effective for reducing disputes, especially with field-based or multi-site workers. Workers should know they're being tracked and understand why.

Q: What if a client consistently forgets to approve hours on time?

A: Set approval deadlines in your service agreement (e.g., 48 hours from the end of the shift). Send automatic reminders. If they persistently miss deadlines, escalate to a senior contact and make it clear the arrangement isn't sustainable — you can't run payroll if approvals are stuck. Consider whether the client relationship is worth the admin burden.

Q: Should we choose timesheet software that integrates with our payroll system?

A: Yes, absolutely. If timesheet data has to be manually exported from your timesheet app and imported into payroll, you've added a manual step where errors creep in. When choosing the right timesheet software, look for systems that sync directly to your payroll software (Payroll, Xero, etc.). That automation cuts admin time and errors.

Next steps

Managing agency worker timesheets is complex because the relationship is complex. But the process itself — once you've written it down, trained everyone, and given them the right tools — becomes routine.

If you're running a staffing agency and managing timesheets manually or across multiple systems, consolidating onto a single platform is one of the quickest wins. Workers can clock in from the field. Clients can approve hours. You have a complete, compliant record in one place.

Relentify's timesheet system is built for staffing agencies and managed services. It supports mobile clock-in, client approval workflows, multi-site tracking, automatic reminders to approvers, and built-in working time compliance checks. Try it free for 14 days — no payment details, no long-term commitment.

The triangular relationship between agency, client, and worker will always create complexity. But accurate timesheets, a clear process, and the right tools turn that complexity into confidence.