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ESCT Guide - Employer Superannuation Contribution Tax

💼 What is ESCT?

Employer Superannuation Contribution Tax (ESCT) is tax on employer contributions to employee superannuation schemes (including KiwiSaver). Employers must withhold and pay ESCT to IRD when making super contributions.

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Key Point: ESCT is withheld by employers on super contributions, not paid by employees. The rate (10.5% to 39%) depends on the employee's salary or wages, ensuring contributions are taxed fairly based on income level. Employees receive net contributions after ESCT.

ESCT Rates (from 1 April 2025)

The thresholds are tested on the employee's salary or wages plus the gross employer superannuation contribution, not on salary alone. Each rate applies to the whole contribution rather than only the amount above the threshold, so crossing a threshold reprices the entire contribution.

Salary/Wages Plus Employer Contribution ESCT Rate Applies To
$0 - $18,720 10.5% Low earners
$18,721 - $64,200 17.5% Middle earners
$64,201 - $93,720 30% Higher earners
$93,721 - $216,000 33% High earners
Over $216,000 39% Top earners

Simple ESCT Example

Employee earning $70,000 annually:

Annual salary: $70,000
Employer contributes 3.5% to KiwiSaver
Gross contribution: $70,000 × 3.5% = $2,450
Threshold test: $70,000 + $2,450 = $72,450
ESCT rate: 30% (falls in the $64,201-$93,720 band)
ESCT: $2,450 × 30% = $735
Net to employee's KiwiSaver: $2,450 - $735 = $1,715

How ESCT Works

Monthly Example:

Monthly salary: $5,833 ($70,000/12)
Monthly gross contribution: $204.17
Monthly ESCT: $61.25
Monthly net contribution: $142.92

Annual Summary:

Total gross contributions: $2,450
Total ESCT paid to IRD: $735
Total received in KiwiSaver: $1,715

Determining the Correct Rate

Employers use one of two methods:

1. Last Year's Salary (Most Common)

Use employee's salary from previous tax year (year ending 31 March).

Employee earned $55,000 in year ended 31 March 2024
For the current tax year, use the 17.5% rate
Applies regardless of current year salary changes

2. Current Year Estimate

Estimate current year salary and use appropriate rate. Adjust if estimate changes significantly.

Employee expected to earn $85,000 this year
Use 33% rate
If actual salary $82,000, employee claims refund in tax return

What Contributions Are Subject to ESCT?

  • Employer KiwiSaver contributions (minimum 3.5%)
  • Employer contributions to registered superannuation schemes
  • Employer contributions to foreign super schemes
  • Voluntary employer contributions above minimum

NOT Subject to ESCT:

  • Employee's own KiwiSaver contributions (taxed via PAYE)
  • Government contributions to KiwiSaver (tax-free)
  • Salary sacrifice arrangements (different tax treatment)

Employer Responsibilities

Calculate ESCT:

Determine correct rate based on employee's salary.

Withhold Tax:

Deduct ESCT from gross contribution amount.

Pay to IRD:

Remit ESCT with PAYE (monthly or twice-monthly).

Report:

Include ESCT in employment information (EI) returns.

💡 ESCT vs PAYE

PAYE: Tax on wages/salary paid directly to employee
ESCT: Tax on employer super contributions
Both withheld by employer, both paid to IRD, but apply to different income types.

Common ESCT Scenarios

New Employee (No Prior Year Data):

Use current year estimated salary
Expected salary: $90,000
Use 33% ESCT rate

Part-Year Employment:

Employee worked 6 months last year, earned $30,000
Annualize: $30,000 × 2 = $60,000
Use 30% rate (based on $60,000)

Salary Increase:

Last year: $56,000 (17.5% rate)
This year: $85,000
Option 1: Continue 17.5% (employee claims refund later)
Option 2: Switch to 33% mid-year (more accurate)
⚠️ Common ESCT Mistakes

Using wrong rate: Check thresholds carefully, rates changed in 2024
Not withholding ESCT: Employer pays penalties if contributions made without ESCT
Forgetting to pay IRD: ESCT must accompany PAYE payments
Incorrect annual salary calculation: Use full year, not part-year earnings

🔢 Calculating ESCT

Example 1: Standard KiwiSaver Employee

Annual salary: $65,000, 3.5% employer contribution

Annual Calculation:

Salary: $65,000 (ESCT rate: 30%)
Gross annual contribution: $65,000 × 3.5% = $2,275
ESCT: $2,275 × 30% = $682.50
Net to KiwiSaver: $2,275 - $682.50 = $1,592.50

Per Pay Period (Fortnightly):

Fortnightly gross pay: $2,500
Gross contribution: $2,500 × 3.5% = $87.50
ESCT: $87.50 × 30% = $26.25
Net contribution: $61.25

Example 2: Multiple Employees Different Brackets

Employee Salary Rate Gross 3.5% ESCT Net
A (part-time) $15,000 10.5% $525 $55.13 $469.87
B $45,000 17.5% $1,575 $275.63 $1,299.37
C $75,000 30% $2,625 $787.50 $1,837.50
D $120,000 33% $4,200 $1,386 $2,814

Company Total:

Total gross contributions: $7,650
Total ESCT to IRD: $2,146
Total net to employees: $5,504

Example 3: Voluntary Contributions Above 3.5%

Employer contributes 6% to attract/retain staff

Employee salary: $80,000 (30% ESCT rate)
Employer contributes 6%
Gross contribution: $80,000 × 6% = $4,800
ESCT: $4,800 × 30% = $1,440
Net to employee: $3,360

Example 4: Salary Change Mid-Year

Employee promoted, salary increased

Scenario:

Prior year salary: $55,000 (17.5% rate)
January-June: Using 17.5% rate
Promotion in July: New salary $90,000

Option A: Continue Old Rate

Use 17.5% all year
Annual contribution: $90,000 × 3.5% = $3,150
ESCT at 17.5%: $472.50
Employee under-taxed, claims in return

Option B: Change Rate (Recommended)

Jan-June: 17.5% on $27,500 = $144
Jul-Dec: 33% on $45,000 = $446
Total ESCT: $590 (more accurate)

Example 5: New Employee

No prior year salary data

New hire starts: August 2024
Estimated annual salary: $95,000
Use 33% ESCT rate
Monthly gross contribution: $237
Monthly ESCT: $78
Monthly net: $159

Payroll Integration

Typical Fortnightly Pay Slip:

Item Amount
Gross salary $3,200
Less: PAYE ($720)
Less: KiwiSaver (3% employee) ($96)
Net pay $2,384
Employer Contributions:
Gross KiwiSaver (3%) $96
ESCT (30%) ($29)
Net to KiwiSaver account $67

Employer Pays to IRD:

PAYE withheld: $720
ESCT withheld: $29
Total to IRD: $749

Employer Pays to KiwiSaver Provider:

Employee contribution: $96
Employer net contribution: $67
Total to provider: $163

🌍 Real-World ESCT Scenarios

1
Small Business 5 Employees

Cafe with varied employee salaries

Employee Role Salary ESCT Rate Annual ESCT
Manager Full-time $68,000 30% $612
Chef Full-time $55,000 17.5% $289
Barista 1 Part-time $28,000 17.5% $147
Barista 2 Part-time $22,000 17.5% $116
Student Casual $12,000 10.5% $38

Business Annual Total:

Total salaries: $185,000
Total gross contributions (3%): $5,550
Total ESCT: $1,202
Total net to employees: $4,348
Employer real cost: $5,550 (ESCT from gross)
2
Tech Company Higher Contributions

Company offers 7% to attract talent

Senior Developer:

Salary: $140,000
ESCT rate: 33%
Gross contribution (7%): $9,800
ESCT: $9,800 × 33% = $3,234
Net to employee: $6,566

Compare to 3% Minimum:

Rate Gross ESCT Net Extra Value
3% $4,200 $1,386 $2,814 -
7% $9,800 $3,234 $6,566 +$3,752

Benefit: Employee gets $3,752 extra per year in KiwiSaver, making total package more attractive.

3
Wrong Rate Correction

Employer used wrong ESCT rate, employee claims refund

Situation:

Employee actual salary: $50,000
Correct ESCT rate: 17.5%
Employer mistakenly used: 30%

What Actually Happened:

Gross contribution: $1,500
ESCT paid at 30%: $450
Net to KiwiSaver: $1,050

What Should Have Happened:

Gross contribution: $1,500
ESCT at 17.5%: $263
Net should have been: $1,237

Resolution:

Over-withheld ESCT: $187
Employee claims in tax return
IRD refunds $187 to employee
4
Seasonal Worker

Orchard worker employed summer only

Employment:

Works December-March (4 months)
Earns $4,000/month = $16,000 total
No prior year data (new to NZ)

ESCT Calculation:

Annualize earnings: $16,000 × 3 = $48,000
Use 17.5% ESCT rate
Monthly gross contribution: $120
Monthly ESCT: $21
Monthly net: $99

4-Month Total:

Total to KiwiSaver: $396
Employee keeps KiwiSaver when returning overseas

🎯 Test Your Knowledge

Complete this quiz on ESCT

1. Who pays ESCT to IRD?
Employee
KiwiSaver provider
Employer
Government
2. ESCT rate for salary of $65,000 is:
17.5%
33%
39%
30%
3. Employer contributes $100 gross with 30% ESCT. Employee receives:
$100
$130
$70
$30
4. ESCT rate is typically based on:
Current month's salary
Prior tax year's salary or current year estimate
Employee's age
Employer's choice
5. Employee earns $45,000. Employer contributes 3.5%. Annual gross contribution is:
$525
$1,575
$1,299
$5,250
6. Employee's own KiwiSaver contributions are:
Subject to ESCT
Tax-free
Subject to both PAYE and ESCT
Subject to PAYE, not ESCT
7. ESCT must be paid to IRD:
With PAYE (monthly or twice-monthly)
Annually
Quarterly
Weekly
8. If employer uses wrong ESCT rate (too high):
Employee claims refund in tax return
Employer gets refund
Money is lost
KiwiSaver provider fixes it
9. For new employee with no prior year data:
Use lowest rate (10.5%)
Use rate based on current year estimated salary
Use highest rate (39%)
Don't pay ESCT for first year
10. Voluntary employer contributions above 3.5% are:
Not subject to ESCT
Subject to higher ESCT rate
Subject to ESCT at same rate
Tax-free to employee

🧮 Try ESCT Calculator
Data sources: the rates and thresholds on this page are maintained against Inland Revenue. Figures are checked twice monthly.