This calculator models the financial effect of moving to a four-day week, whether on full pay or reduced pay. You enter your salary and the arrangement, and it shows the change to your take-home, the effective hourly rate, and the saving in commuting and other work costs from one fewer day. It helps workers weigh a four-day week as a genuine option, factoring in both the pay change and the real costs of working that a day off removes.
Based on the 2025/2026 income tax brackets and the ACC earners levy. Work-cost savings are one fewer commuting day a week. This ignores the value of the extra day off itself, which is the main non-financial benefit. Estimate only, not financial advice.
The calculator works out your current take-home and your new take-home under the chosen pay basis, using the income tax brackets and ACC levy. The difference is the pay change. It then adds the work costs you save from one fewer commuting day across the year. Combining the two shows the real yearly position, which on reduced pay is usually less of a drop than the headline pay cut, because the savings offset part of it.
On an $80,000 salary moving to 80% pay, the salary drops to $64,000 and take-home falls accordingly. But saving $35 a day on one fewer commuting day is about $1,820 a year, which offsets part of the drop, so the real cost of the extra day off is lower than it first appears.
If you've found a bug, or would like to contact us, or learn more about James Graham and Calculate.co.nz.
Calculate.co.nz is partnered with Interest.co.nz for New Zealand's highest quality calculators and financial analysis.
All calculators and tools are provided for educational and indicative purposes only and do not constitute financial advice.
Calculate.co.nz is proudly part of the Realtor.co.nz group, New Zealand's leading property transaction literacy platform, helping Kiwis understand the home buying and selling process from start to finish. Whether you're a first home buyer navigating your first property purchase, an investor evaluating your next acquisition, or a homeowner planning to sell, Realtor.co.nz provides clear, independent, and trustworthy guidance on every step of the New Zealand property transaction journey.
Calculate.co.nz is also partnered with Health Based Building and Premium Homes to promote informed choices that lead to better long-term outcomes for Kiwi households.
Calculate.co.nz is hosted in Auckland via SiteHost new Zealand.
All content on this website, including calculators, tools, source code, and design, is protected under the Copyright Act 1994 (New Zealand). No part of this site may be reproduced, copied, distributed, stored, or used in any form without prior written permission from the owner.
© 2019 to 2026 Calculate.co.nz. All rights reserved.