Total Assignment Cost (TAC)
What is Total Assignment Cost (TAC)?
A comprehensive calculation of all direct and indirect costs associated with sending an employee on an international assignment, used to assess ROI and inform policy decisions.
Total assignment cost includes all expenses related to an international assignment, from compensation and benefits to relocation, housing, tax equalization, immigration, travel, and administrative overhead. TAC provides a complete picture of what an assignment truly costs, enabling organizations to make informed decisions about deployment, policy design, and vendor management.
Direct costs typically include base salary, allowances (COLA, housing, hardship), tax equalization payments, relocation expenses, immigration fees, and travel costs. Indirect costs may include administrative time, productivity loss during transition, and the opportunity cost of the employee's absence from the home office.
Organizations that track TAC consistently can benchmark costs across assignment types, corridors, and business units. This data is essential for demonstrating the value of the mobility program to senior leadership and for identifying opportunities to optimize costs without compromising employee experience or compliance.
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Frequently Asked Questions
How is total assignment cost calculated?
TAC is calculated by summing every employer-paid cost across the assignment lifecycle. Components include base salary, hypothetical tax credits, mobility allowances such as housing and cost of living, actual home and host country taxes, social security, benefits, immigration costs, relocation services, tax preparation, and ongoing vendor fees. Most enterprise programs use mobility software to automate TAC calculation.
Why does total assignment cost matter?
TAC matters because international assignments typically cost two to four times the assignee's home country salary, with major variation by destination. Accurate TAC supports assignment approval decisions, business case validation, and budget planning. Companies that track TAC consistently can benchmark across destinations, policies, and business units to optimize program design and identify cost-reduction opportunities.
What drives variation in total assignment cost?
TAC variation is driven primarily by destination country tax rates, housing costs, and immigration complexity. Policy design also matters: tax equalization, balance sheet allowances, and tier-based benefits each shift costs significantly. Assignee profile affects TAC through family size, dependents, and home country tax position. Duration matters because most allowances accrue monthly throughout the assignment.
Related Terms
Balance Sheet Approach
A compensation methodology for international assignees that aims to keep employees financially 'whole' relative to their home country, by separately tracking income, taxes, housing, and goods and services costs.
Cost of Living Adjustment (COLA)
A compensation supplement given to assignees to account for differences in the cost of goods and services between their home and host locations, ensuring their purchasing power is maintained.
Tax Equalization
A compensation policy designed to ensure that an employee on international assignment pays no more or less tax than they would have in their home country, with the employer absorbing any difference.
Hypothetical Tax (Hypo Tax)
A notional tax withheld from an assignee's paycheck under a tax equalization policy, representing what they would have paid in taxes had they remained in their home country.
Relocation Package
A bundle of benefits and allowances provided by an employer to support an employee moving to a new location, which may include moving expenses, temporary housing, travel, and settling-in support.