Fundamentals · 6 min read
Effective vs marginal tax rate
The two percentages every salary calculator should show—and why they are not interchangeable.
Your marginal rate applies to the next unit of taxable income. Your effective rate is total deductions divided by gross income. Both are useful, for different decisions.
Effective rate describes the whole salary
If tax and mandatory contributions total 24,000 on a gross income of 80,000, the effective deduction rate is 30%. It is the clearest single number for comparing take-home outcomes.
Marginal rate describes the next raise
A 40% marginal band does not mean the entire salary is taxed at 40%. It means the next slice is. Allowance withdrawals and benefit phase-outs can create unusually high marginal zones even when the headline top rate is lower.