Mary Zwolak
District School Board of Niagara/Administrator-System
2023 Salary — last year on the list
$152,999Total compensation $152,999, including $0 in taxable benefits.
Source: Ontario’s Public Sector Salary Disclosure — names paid $100,000 or more that year. How we build this · Report an error on this page
At a Glance
2023
Employer Rank
#16District School Board of Niagara
Years on List
122011–2023
Peak Salary
$152,9992023
Full 2023 roster at District School Board of Niagara →·See where $152,999 ranks →
Total Compensation History
Full History
2011–2023
$108,779 in 2011 is worth about $148,971 in 2025 dollars.
Take-Home Pay
(After Tax) · 2023 estimate
Take-home on Mary Zwolak's 2023 salary of $152,999 comes to roughly $104,200 once federal and Ontario income tax (about 28.8% effective) is deducted. For comparison, the median System Administrator on the 2023 list was paid $111,474; this salary is about 37% more. That is about 38% more than the $111,124 paid in 2022. Pension contributions — likely OTPP for teachers or OMERS in the School Boards sector — would typically trim another 7–10% off that figure.
- Estimated net pay
- ~$104,200
- Effective income-tax rate (excl. CPP/EI)
- ~28.8%
- CPP + EI contributions
- ~$4,756
- All-in deduction rate (incl. CPP/EI)
- ~31.9%
- vs. 2023 System Administrator median
- +37%
Where does $152,999 rank on the Sunshine List? →
Estimate only: 2023 federal and Ontario rates, basic personal amounts, Canada employment amount and CPP/EI credits; single, employment income only, salary treated as full-year income. Ignores pension contributions (OMERS, HOOPP, OTPP, OPTrust and similar plans lower actual take-home), union dues, RRSPs and benefits.