Flexitime vs TOIL: What's the Difference and Which Should You Offer?

Both flexitime and TOIL give employees flexibility over their working hours — but they work very differently, suit different business types, and come with different legal and admin requirements. Getting them confused (or mixing them up without clear policies) creates payroll errors, resentment, and compliance headaches.

This guide explains how each system works, the practical differences for employers, and how to decide which — or both — is right for your team.

What Is Flexitime?

Flexitime is an arrangement where employees work a set number of hours per week or month, but choose when they start and finish — within agreed boundaries. Rather than being required to work a rigid 9-to-5, employees can shift their hours earlier or later to suit their lives, as long as they hit their contracted total.

Most flexitime systems include core hours — a window when all staff must be present or available (for example, 10am to 3pm). Employees flex the hours around the core. Someone might start at 7am and leave at 3pm; another might start at 10am and work until 6pm — both fulfil the same contracted day.

Tracking works by logging start and end times each day and checking the total against contracted hours at the end of the week or month. The key point is that hours are not banked under flexitime — they are simply flexible within the period. If an employee works 9 hours on Monday and 7 hours on Tuesday, those hours balance each other out within the week. There is no running account of credit and debt carried forward.

Flexitime works best for desk-based or office workers, professional services firms, and any environment where the quality and volume of output matters more than the precise hours of presence. Learn how TimeTally supports flexitime tracking.

What Is TOIL (Time Off In Lieu)?

TOIL (Time Off In Lieu) is a different arrangement entirely. When an employee works beyond their contracted hours — genuine overtime — they accrue time off to use later, instead of being paid for those extra hours. The overtime hours are banked as leave credit.

The accrual rate is agreed in advance. The most common arrangement is 1:1 — one hour of overtime earns one hour of TOIL. Some employers offer 1.5:1 or even 2:1 for unsocial hours (evenings, weekends, bank holidays). Whatever rate is agreed, it should be documented clearly in the employment contract or a written TOIL policy.

Unlike flexitime, TOIL hours are carried across pay periods. An employee might work two extra hours on a project deadline in May, bank that TOIL, and use it for a long weekend in July. The balance persists until it is taken or expires under the policy rules.

TOIL works best for businesses where workload spikes unpredictably — hospitality, retail, event-based industries, or project-based professional services where crunch periods are followed by quieter times. See our TOIL management software or use the TOIL calculator to work out accrual under any rate.

Key Differences: Flexitime vs TOIL

The table below summarises the most important practical differences between the two systems:

Legal Considerations

Neither flexitime nor TOIL is specifically defined in UK legislation. There is no statute that grants employees a right to flexitime, and TOIL is not a statutory entitlement. Both arrangements are governed entirely by what is agreed in the employment contract or written workplace policy.

That said, the Working Time Regulations 1998 (WTR) apply to both. The WTR sets a maximum average working week of 48 hours (unless an employee has opted out in writing). Under a flexitime or TOIL arrangement, employers must still monitor total hours to ensure employees are not regularly breaching this limit. Flexible start and end times do not exempt an employer from WTR obligations.

TOIL raises an additional issue around holiday pay. For workers with irregular or variable hours, accrued TOIL leave may need to be factored into the holiday pay calculation — particularly since the Supreme Court's Harpur Trust v Brazel ruling and subsequent amendments to the holiday pay regulations. If TOIL can be carried into the next holiday year, it may also interact with statutory holiday entitlement, creating a complex overlap.

For the full legal picture, see our labour compliance guide and our Working Time Regulations guide.

Which Should You Choose?

The right answer depends on the nature of your work and workforce. Here is a practical decision framework:

• Desk or office workers with consistent contracted hours — flexitime is the natural fit. It gives autonomy without creating complex accrual tracking.
• Hospitality, retail, care, or event-based businesses — TOIL is usually better. Workloads spike unpredictably, staff regularly work beyond contracted hours, and paying overtime for every extra shift is expensive.
• Project-based businesses — TOIL works well for crunch periods. Developers, consultants, and agency staff often work long hours in short bursts; banking those hours as leave provides a natural recovery mechanism.
• Remote or distributed teams — flexitime tends to work well for remote workers, since output is easily measured and hours are self-managed. TOIL is harder to administer without purpose-built software, because managers cannot easily see when remote employees are working overtime.

Can you offer both?Yes — and many employers do. A common approach is to offer flexitime for the core contracted working week, and TOIL for genuine overtime beyond contracted hours. This provides day-to-day flexibility without creating a system where employees are constantly in "credit" on regular hours. The key is clear written policies that define exactly what counts as flexitime movement and what triggers TOIL accrual.

How to Implement Flexitime

Introducing flexitime well requires clarity upfront. Follow these steps:

1. Define core hours. Identify the window when all employees must be available. For most office environments, somewhere between 10am and 3pm works well — it covers meetings, client calls, and team collaboration without being too restrictive.
2. Set the weekly or monthly hour target. Specify exactly how many hours employees must work in the flexitime period. This should match their contractual hours.
3. Choose a tracking method.Employees need to log their start and end times each day. TimeTally's clock-in/clock-out feature makes this automatic — the system calculates daily totals and flags any shortfall against the contracted target.
4. Set rules for overages and deficits. What happens if an employee works 2 hours extra on Monday? Can they leave 2 hours early on Friday? Is there a maximum carry within the week? Document this clearly to avoid disputes.

See how TimeTally handles flexitime tracking for teams of all sizes.

How to Implement TOIL

TOIL requires more upfront policy work than flexitime, but a solid foundation prevents the most common problems. Here is what to set up:

1. Define what qualifies as overtime. Not all extra hours should trigger TOIL — only hours worked genuinely beyond the contracted working week, with manager pre-approval. Be specific: does staying 30 minutes late qualify? What about working through lunch?
2. Agree the accrual rate. The standard is 1:1 (one hour of overtime earns one hour of TOIL). You may want to offer 1.5:1 for evenings or weekends, or 2:1 for bank holidays. Whatever you choose, document it in the policy and the contract.
3. Set a maximum TOIL balance and expiry rules. Cap how much TOIL can be accrued at any time (for example, a maximum of 16 hours or two working days). Set an expiry — TOIL not taken within three months of accrual, or by the end of the leave year, is forfeited. This prevents balances from becoming an unmanaged liability.
4. Define how employees request TOIL leave. Treat TOIL leave requests in the same way as annual leave requests — submitted in advance, subject to manager approval, and tracked in your leave management system.
5. Document everything in a written TOIL policy. Download our free TOIL policy template to cover all the essential elements.

Tracking Both in TimeTally

Managing flexitime and TOIL manually — whether on spreadsheets or in separate systems — quickly becomes unmanageable as your team grows. Hours get lost, balances become inaccurate, and employees lose trust in the records.

TimeTally is built to handle both:

• TOIL balances update automatically when employees submit time tracking — no manual calculation required. Managers approve time tracking and TOIL accrues instantly.
• Managers see real-time TOIL balances alongside annual leave in a single dashboard — no switching between systems.
• Clock-in/clock-out makes flexitime tracking entirely automatic. Start and end times are recorded, daily totals are calculated, and any shortfall or surplus is immediately visible.
• Employees can see their own TOIL balance and flexitime hours at any time — reducing queries to managers and payroll.

Learn more about TOIL management in TimeTally, flexitime tracking, and timesheet approval workflows — or start a free trial to see it in action.