Paying Out Overtime vs. Time Off in Lieu – Tax and Legal Implications

The question of "paying out overtime vs. taking time off in lieu (TOIL)" is frequently treated as a matter of corporate culture. In reality, it is first and foremost a financial and mathematical calculation — and the answer is usually the same for both sides.

Tax and Contribution Treatment of Overtime Payouts

Overtime compensation constitutes general earnings from employment. Under UK tax legislation (ITEPA 2003), it is fully subject to Income Tax collected via Pay As You Earn (PAYE) and Class 1 National Insurance contributions (NICs) for both employee and employer. No statutory tax exemption or general tax relief applies.

The Progression Effect and National Insurance Thresholds

When accrued overtime hours are paid out as a lump sum, the payment causes a sharp spike in the employee's gross pay for that pay reference period. Under PAYE, Income Tax is calculated on a cumulative basis across the tax year, meaning any temporary spike into a higher tax band (e.g. from the basic 20% rate to the 40% higher rate) will automatically balance out over the tax year — avoiding a permanent bracket progression penalty.

The situation differs for Class 1 National Insurance contributions (NICs), which are calculated non-cumulatively on a discrete pay-period basis (weekly or monthly):

• Employee NICs: If a lump-sum payout pushes an employee's earnings above the Upper Earnings Limit (UEL) in a single monthly payroll run, the employee pays the main primary NIC rate up to the UEL and only the reduced rate (e.g. 2%) on earnings above the UEL.
• Employer NICs: Secondary Class 1 contributions are payable by the employer without an upper earnings cap on all earnings above the secondary threshold.
• National Minimum Wage (NMW) Compliance: Employers must ensure that unpaid additional hours or uncompensated overtime do not cause an employee’s average hourly pay rate to drop below the statutory National Minimum Wage / National Living Wage across any pay reference period under the National Minimum Wage Act 1998.

Direct Comparison

The Employer's Perspective

Granting time off in lieu (TOIL) is financially more advantageous — it incurs no additional total employer labour costs (such as secondary Class 1 National Insurance contributions or increased employer pension contributions). Its trade-off is the temporary loss of labour capacity at the time the leave is taken, which must be planned and managed systematically.

Paying out overtime is more expensive, but preserves immediate operational capacity. A payout is the right choice when:

• compensatory time off is operationally unfeasible due to critical staffing requirements,
• accrued working time credits have reached their contractual cap,
• or the employment relationship is being terminated and outstanding time cannot be taken during the statutory notice period.

The Employee's Perspective

When overtime is paid out, a significant portion of the gross amount is deducted for Income Tax, employee National Insurance, and applicable pension contributions. In contrast, time off in lieu retains 100 percent of its nominal value — one compensatory hour off is worth a full hour of paid rest.

From a purely mathematical standpoint, compensatory leave is almost always more advantageous for the employee. Nevertheless, employees often opt for payouts because cash is immediately available, whereas time off must be requested, approved, and scheduled later.

Accounting and Balance Sheet Treatment

Positive working time balances represent outstanding, unliquidated liabilities of the organisation. Under UK GAAP (FRS 102 Section 28 / Employee Benefits) and international financial reporting standards (IAS 19), an accrual for short-term compensated absences and unliquidated time credits must be recognised on the balance sheet.

This provision must be valued at the expected settlement amount, including:

• Basic hourly or salaried wage rate,
• Employer's secondary Class 1 National Insurance contributions,
• Employer statutory pension contributions.

Practical consequence: A growing mountain of accrued overtime balances burdens company earnings (EBIT / operating profit) even if no cash is paid out. The accounting expense is incurred in the financial period when the working time is performed, not when it is liquidated or taken.

Key Elements to Include in a Company Overtime and TOIL Policy

1. Right of Choice — who determines whether overtime is paid out or taken as TOIL (employer, employee, or by mutual written agreement)?
2. Time Limits for taking compensatory time off (e.g. within 3 to 6 months), including defined rollover rules or forfeiture provisions (subject to National Minimum Wage compliance).
3. Bandwidth Caps — upper and lower thresholds for accrued hours on the employee's time account.
4. Procedure Upon Reaching Caps — automated warnings, mandatory reduction plans, or automatic payroll settlement.
5. Settlement Upon Termination — explicit rules for paying out untaken accrued TOIL upon termination of the employment contract in accordance with Section 1 of the Employment Rights Act 1996.
6. Clear Distinction between voluntary flexible working / flextime credits within bandwidth hours and authorised, management-mandated overtime.

The last point is critical: Without a clear demarcation between employee-directed flextime and management-directed overtime, organizations risk disputes before the Employment Tribunal over unauthorised hours and contractual overtime pay entitlements.

Attachment of Earnings and Statutory Deductions

Where an employee is subject to an Attachment of Earnings Order (AEO) issued by the Courts or a Direct Earnings Attachment (DEA) from the Department for Work and Pensions (DWP), overtime pay is classified as attachable earnings. To maintain payroll compliance, employers must ensure that deductions do not breach the employee's statutory Protected Minimum Earnings rate. Overtime pay should always be processed under a distinct payroll pay element rather than rolled into basic pay.

Sources and Legal Framework

Statutes and Regulations

• Working Time Regulations 1998 (SI 1998/1833) / EU Directive 2003/88/EC — Regulation 4 (maximum 48-hour average working week over a 17-week reference period, unless opted out under Regulation 5), Regulation 10 (daily rest of 11 consecutive hours), Regulation 11 (weekly rest), and Regulation 12 (rest breaks of 20 minutes for shifts over 6 hours).
• Employment Rights Act 1996 (ERA 1996) — Section 1 (written particulars of terms including overtime and remuneration rules) and Section 13 (protection against unlawful deductions from wages).
• National Minimum Wage Act 1998 (NMWA 1998) — Legal requirement ensuring total pay divided by total hours worked in any pay reference period does not fall below the statutory rate.
• Income Tax (Earnings and Pensions) Act 2003 (ITEPA 2003) & Social Security Contributions and Benefits Act 1992 (SSCBA 1992) — Statutory framework for PAYE Income Tax and Class 1 National Insurance contributions on employment earnings.
• ECJ Ruling C-55/18 (CCOO v Deutsche Bank) & Regulation 9 WTR — Employer duty to maintain an objective, reliable, and accessible system for recording daily working time.

Judicial Guidance and Case Law

• Bear Scotland Ltd v Fulton [2015] IRLR 15 & East of England Ambulance Service NHS Trust v Flowers [2019] EWCA Civ 947 — Inclusion of regular and non-guaranteed overtime in the calculation of statutory holiday pay.
• Transparency of Contractual Terms — Blanket clauses seeking to exclude overtime remuneration must satisfy contractual certainty and must not breach statutory minimum wage thresholds.

Status: August 2026. This article provides general HR and legal guidance and does not constitute formal legal or tax advice for specific individual cases.