Medicare levy and surcharge: why correct payroll can still leave a tax bill

Published by SESAY · 2026-10-07 · General Australian payroll guidance

What to understand first

The Medicare levy and Medicare levy surcharge are different. Surcharge assessment can depend on income, family circumstances and appropriate hospital cover. Payroll does not necessarily have that complete picture. Correct regular withholding therefore does not guarantee that all amounts assessed at tax time have already been covered.

Practical checks

• Review ATO guidance for the relevant income year.
• Consider household circumstances and cover periods with your adviser.
• Check payroll declarations where they are relevant.
• Discuss additional withholding if your wider tax estimate indicates a shortfall.

Fictional example

Fictional employee Sophie receives accurate payslips throughout the year but has a change in household income and hospital cover. She later receives a tax assessment she did not expect. Instead of assuming payroll used the wrong tax table, she checks the assessment components and seeks advice about her individual circumstances.

Your next step

Payroll teams can explain what their calculation includes and direct employees to the correct ATO information. They should not collect unnecessary health details or recommend insurance products. Employees comparing take-home pay should remember that coworkers may have different household and tax circumstances even when their salary is the same.

How SESAY can help

SESAY can help create clear payroll query guidance so employees understand what payroll can check and when individual tax advice is needed.

Official sources

• ATO — Understanding the Medicare levy and surcharge

Sources researched 2026-10-07. Examples are fictional and use stated assumptions. Confirm current rules and your circumstances before acting. This is general information, not individual tax or legal advice. SESAY is independent of the regulators linked here.