South Africa Tax Calculator — Effective vs Marginal Rate

South Africa's income tax system uses a progressive scale of seven brackets, ranging from 18% at the bottom to 45% for income above R1.817 million. A fundamental source of confusion for many taxpayers is the difference between the marginal rate and the effective rate. Your marginal rate is the rate that applies to your last rand of income — if you earn R500,000 and fall in the 31% bracket, you pay 31% only on income between R370,501 and R500,000. Your effective rate — the percentage of total income actually paid in tax — is always considerably lower than the marginal rate.

SARS also provides rebates that reduce tax directly, rand-for-rand. The primary rebate of R17,235 applies to everyone. If you are 65 or older, the secondary rebate of an additional R9,444 applies. If you are 75 or older, a further tertiary rebate of R3,145 reduces your tax liability. These rebates effectively create tax-free thresholds: single persons under 65 pay no income tax until their annual income exceeds approximately R95,750.

This calculator computes your 2025/26 SARS income tax liability with the correct bracket calculation and rebate, then presents your effective rate, marginal rate, net income, and monthly take-home pay. It also highlights your tax bracket in the rate table and shows the visual split between what you keep and what goes to SARS — helping you understand your real position, not just your bracket.