# Supplemental Pay: Global Hiring and EOR Guide > Machine-readable page from EOR Overview (https://eoroverview.com/), an independent research platform for Employer of Record services. > Canonical page: https://eoroverview.com/glossary/supplemental-pay/ > Methodology: how providers are researched, scored and compared is documented at https://eoroverview.com/methodology/. > Disclosure: EOR Overview is free to use. We may earn a referral fee from some providers; this never affects a rating or ranking position (https://eoroverview.com/disclosure/). Supplemental pay covers any compensation paid to employees beyond their fixed base salary or regular wages - think bonuses, commissions, overtime, severance, and similar variable payments. In a domestic US context, the main concern is how the IRS taxes these payments. When you hire internationally, the complexity multiplies: every country defines, taxes, and sometimes mandates supplemental pay differently, and an Employer of Record must handle that compliance on your behalf. ## Explanation What is supplemental pay? Supplemental pay is compensation paid on top of an employee's regular base salary or hourly wage. It is variable by nature - it may change in amount, frequency, or both - and it typically reflects performance, special circumstances, or legally required top-ups. Common forms of supplemental pay include: - Bonuses - performance bonuses, signing bonuses, holiday bonuses, and retention bonuses - Commissions - variable payments tied to sales or revenue targets - Overtime pay - compensation for hours worked beyond the standard threshold - Severance pay - lump-sum or phased payments on termination of employment - Back pay and retroactive pay - adjustments for prior underpayment - Vacation pay-outs - payment for accrued but unused leave upon separation - Tips and awards - cash tips and certain non-cash employee recognition payments What does not qualify as supplemental pay: regular salary, standard hourly wages paid on a consistent schedule, routine expense reimbursements, and standard payroll deductions for benefits like health insurance or retirement contributions. Supplemental pay in the United States: the tax basics The IRS treats supplemental wages differently from regular wages. Two withholding methods apply: - Percentage (flat-rate) method - A flat federal withholding rate applies to supplemental wages paid separately from regular wages. Check the current IRS Publication 15 for the applicable rate, as Congress can adjust it. - Aggregate method - The supplemental payment is combined with the employee's most recent regular paycheck, and withholding is calculated on the combined total using the employee's Form W-4, then reduced by the tax already withheld on the regular portion. Employers report all supplemental wages on the employee's Form W-2. The method chosen can affect how much tax is withheld in the paycheck, but the employee's actual annual tax liability is settled at filing. Supplemental wages over a threshold (set by IRS rules) are subject to a higher mandatory withholding rate - consult IRS Publication 15 for the current figure. State rules vary significantly. Some states mirror federal treatment; others set their own flat supplemental rates or require the aggregate method. Multi-state employers need state-specific payroll logic for every jurisdiction where employees work. Why supplemental pay gets complicated when hiring globally The US IRS framework above applies only to workers employed in the United States. The moment your workforce crosses a border, an entirely different set of rules governs how supplemental pay is defined, taxed, and sometimes legally required. Three things change immediately: - Definition - Many countries do not use the term "supplemental wages" at all. The underlying payments (bonuses, overtime, severance) still exist, but they are governed by local labor codes and tax law rather than IRS guidance. - Mandatory supplemental payments - Several countries require employers to pay certain bonuses or extra salary installments by law. These are not optional performance rewards; they are statutory obligations. - Tax treatment - There is no global equivalent of the flat federal withholding rate. Each country calculates income tax on variable pay using its own progressive tax tables, special withholding rules, or social contribution bases. Mandatory supplemental pay: what countries require by law Many international employers are surprised to discover that bonuses they think of as discretionary are actually legally mandated in certain markets. Failing to pay them triggers fines, back-pay claims, and reputational damage. Country Mandatory supplemental pay Notes Mexico Aguinaldo (13th-month bonus) Minimum 15 days of salary, paid by December 20 each year. Many employers pay more. Brazil 13th salary (décimo terceiro) Two installments: first by November 30, second by December 20. Employees who leave mid-year receive a proportional amount. Philippines 13th-month pay Required for all rank-and-file employees who have worked at least one month. Paid by December 24. Argentina SAC (sueldo anual complementario) Equivalent to half the highest monthly salary earned in each semester, paid twice a year. Indonesia THR (Tunjangan Hari Raya) Religious holiday allowance - one month's salary for employees with at least 12 months of service, paid before the relevant religious holiday. Italy Tredicesima (13th month) Paid in December; some collective agreements add a 14th-month payment. Spain Two extra salary payments per year Governed by collective bargaining agreements; timing varies by sector. India Statutory bonus under the Payment of Bonus Act Applies to certain employee categories and salary ranges; percentage set by law. This is not a complete list. Before hiring in any new country, verify mandatory payments with local legal counsel or an Employer of Record. Overtime: a global patchwork Overtime is one of the most variable forms of supplemental pay across jurisdictions. The US threshold of 40 hours per week is one approach among many: - France - The standard workweek is 35 hours. Hours 36-43 are paid at a 25% premium; above 43 hours, the premium rises to 50%. - Germany - No single statutory overtime rate; rates are set by collective agreements or individual contracts. Some sectors require time-off-in-lieu rather than extra pay. - Japan - Overtime beyond 8 hours per day or 40 hours per week is paid at a minimum 25% premium. Late-night and holiday overtime carry higher rates. - Australia - Rates vary by Modern Award; most specify a 50% penalty for the first two to three overtime hours and 100% thereafter. - United Kingdom - No statutory overtime rate exists. Employers must only verify that average hourly pay does not fall below the National Minimum Wage when overtime is included. A flat 22% US supplemental withholding concept is irrelevant in these jurisdictions. Overtime is taxed as regular employment income under local progressive tax bands. Severance pay across borders In the US, severance is usually discretionary (outside of WARN Act situations). Internationally, termination payments are frequently a legal right, and the amount is often prescribed by statute based on length of service, salary, and reason for termination. - Brazil - Dismissed employees (without cause) are entitled to 40% of their FGTS (provident fund) balance as a fine, plus notice pay and accrued benefits. - Colombia - Severance (cesantías) accrues at one month's salary per year of service and is paid into a government-administered fund annually. - Indonesia - The Manpower Law sets a formula: uang pesangon (severance), uang penghargaan (service recognition pay), and uang penggantian hak (compensation for benefits). The calculation depends on years of service and reason for termination. - France - Statutory severance (indemnité légale de licenciement) applies after eight months of service. Collective agreements often provide higher amounts. Misunderstanding severance obligations is one of the most common and costly errors for companies expanding abroad without local support. Supplemental pay and EOR arrangements When you hire through an Employer of Record, the EOR becomes the legal employer in the worker's country. That means the EOR - not your company - is responsible for calculating, withholding, and remitting taxes on all supplemental pay, including mandatory bonuses, overtime, and severance. What this means in practice: - You agree on the gross compensation package (including any performance bonuses or commissions) in your client agreement with the EOR. - The EOR applies local tax and social contribution rules to determine the net amount and the employer's additional cost (social charges, payroll taxes). - Mandatory supplemental payments (13th month, THR, etc.) are built into the EOR's cost estimate. If you forget to budget for them, you will face an unexpected invoice. - Discretionary bonuses you want to pay must be communicated to the EOR in advance so the payroll can be processed correctly in the local payroll cycle. One common friction point: US companies want to pay a "performance bonus" mid-year and wire funds to the worker directly. Under an EOR model, all compensation must flow through the EOR's payroll to meet tax withholding obligations. Payments made outside payroll create misclassification exposure and tax compliance failures. Misclassification risk and supplemental pay Companies that engage foreign workers as independent contractors sometimes use "bonus" or "commission" payments to compensate for the absence of a benefits package. Regulators in many countries view this pattern as evidence of an employment relationship rather than a genuine contractor arrangement. Red flags that increase misclassification risk: - Regular "bonuses" paid on a fixed schedule that function like salary top-ups - Commission structures where the company controls pricing and the worker has no independent client base - "Overtime" payments to contractors - overtime is an employment-law concept and signals that the worker is de facto an employee - Severance paid to contractors on contract end - genuine contractors do not receive severance Misclassification penalties vary by country but can include back taxes, social contributions, fines, and mandatory employment benefits owed retroactively. In France, Brazil, and Spain in particular, enforcement is active and penalties are substantial. Equity compensation as supplemental pay internationally Stock options, restricted stock units (RSUs), and employee stock purchase plans (ESPPs) are forms of supplemental pay that carry additional cross-border complexity. The tax event, the applicable rate, and the reporting obligations differ by country: - In the US, RSU vesting is typically taxed as ordinary income (supplemental wages) at vesting. - In the UK, approved share schemes may qualify for capital gains treatment; unapproved awards are subject to income tax and National Insurance at exercise or vesting. - In Germany, employee stock options are taxed at vesting in most cases, at the marginal income tax rate, not a flat rate. - In Canada, employee stock options have a partial inclusion benefit at the federal level, but rules changed in 2021 for options granted by larger employers. EOR providers vary significantly in their ability to administer equity compensation for international employees. Many require the home company to handle equity reporting directly or use a specialist equity administration platform that integrates with the EOR's payroll. Budgeting for supplemental pay in global headcount plans When modeling the cost of an international hire, supplemental pay obligations are easy to underestimate. A practical checklist: - Identify mandatory bonus or 13th/14th-month salary obligations in the target country. - Determine statutory overtime rates and any collective agreement premiums that apply to your employee's role. - Estimate termination costs (statutory severance formula) as a contingency line in your budget. - Account for employer social contributions on supplemental pay - in many countries, bonuses are subject to the same payroll taxes as base salary, which can add 20-40% to the gross bonus cost. - Confirm how equity or commission payments will be processed through the EOR payroll and what the tax treatment will be at the local level. For more on total employment cost modeling, see the compensation planning and payroll glossary entries.