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Updates for Tax Payers

Diamond Head Tax Group - Oahu Tax Preparation and Filing in
the State of Hawaii serves Businesses. 

We  file their taxes, provide bookkeeping services and 
Business organization consulting. 

Tax Year 2023 Deadline Extension

Taxpayers must file their returns by April 22, 2024. While the law requires taxpayers to file by April 22, taxpayers are granted an automatic 6-month extension (no form is required to request the extension) to file the return through October 22, 2024 if one of these two conditions is met:

1. The taxpayer is due a refund, or

2. The taxpayer pays the properly estimated tax amount owed by April 22, 2024. Taxpayers who are not able to pay the properly estimated tax amount owed should pay as much as they can to avoid additional interest and penalties.

Adoption of Federal Tax Provisions

For more information on the adoption of the Federal Tax Provisions during the 2023 legislative session, please see page one (Act 56: Income and Estate Tax Conformity) of the following link: Tax Announcement 2023-04

New Form N-11SF

The Hawaiʻi Department of Taxation recently released the N-11SF, a simplified individual income tax form for taxpayers whose 2023 federal and Hawaiʻi adjusted gross incomes are zero. Other requirements apply to be able to use this form and it cannot be filed electronically.

Please refer to the links below for additional instructions and access to the form.

Pass-Through Entity Taxation

For taxable years beginning after December 31, 2022, partnerships and S corporations may elect to pay Hawai’i income taxes at the entity level. Eligible members of an electing pass-through entity (PTE) may claim a Hawai’i income tax credit for the pro rata share of PTE taxes paid.

Visit the Pass-Through Entity Taxation page for more information.

Frequently Asked Questions

How do I get a six-month extension to file my return?

You are not required to file any form to request an automatic 6-month extension of time to file Form N-11 or N-15. The 6-month extension is automatically granted as long as all of the following conditions are met:

  • The properly estimated tax liability is paid on or before April 22

  • The tax return is filed on or before October 22

  • The tax return is accompanied by full payment of any tax not already paid; and

  • You are not bound by a court order to file a tax return on or before April 22.

Properly estimated tax liability means you have made a bona fide and reasonable attempt to locate and gather all of the necessary information to make a proper estimate of tax liability for the taxable year and at least 90% of your total tax liability shown on the return is paid.

How do I make a payment?

To make a tax payment on or before April 22, you can submit an electronic payment via Hawaii Tax Online ( by selecting “Make Payment” under the “Quick Links” section with a payment type of “Estimated Payment.”

To pay by check, attach a completed Form N-200V to your payment then mail or hand-deliver to one of our drop-off boxes.

See Tax Facts 2021-1 for more information regarding “Income Tax Extensions for Individuals, Corporations, Partnerships, Trust, and REMICS.”

Does an extension to file my return give me more time to pay my taxes?

The automatic six-month extension only provides additional time to file your return. The extension does not give you more time to pay taxes owed. You must pay your properly estimated tax liability on or before April 22.

If you think you will owe tax but cannot pay the entire liability, you should pay as much as you can to avoid penalties and interest.

How do I know how much tax to pay to get the automatic extension?

You must make a bona fide and reasonable attempt to locate and account for all of the information necessary to make the estimate of the tax owed as of April 22. In addition to the information available for the current tax year, taxpayers should also consider the amount of tax owed in prior years. The Department suggests overestimating the tax owed when calculating your estimated payment to avoid penalties and interest and to qualify for the automatic extension.

What happens if my properly estimated tax liability is not paid by April 22nd?

If you do not pay your properly estimated tax liability, which is at least 90% of your final tax liability as reported on your return, there is no extension. You will be assessed penalties and interest on the amount unpaid.

Will I still get the automatic extension if I don’t pay any outstanding tax liability with my return?

No, one of the conditions to receive the extension is that the full payment of any remaining unpaid tax be paid at the same time that the return is filed.

If I electronically file my income tax return, how do I make my accompanying payment?

The Department deems electronic payments made on the same day that the return is electronically filed to be a payment accompanying the return.

Link to official form info: Hawaii N-35

Upcoming Due Dates in the Next Year:*

 Friday Mar 15, 2024​

* Due dates are based on the filing requirements for this form and may vary depending on your tax year.

10 Hawaii Tax Filings & Forms:

N-11 - Individual Income Tax Return

N-30 - Corporation Income Tax Return

N-20 - Partnership Return of Income

HW-14  Withholding Tax Return

UC-B6 Unemployment Quarterly Contribution Report

N-15 - Nonresident and Part-Year Resident Income Tax

N-35 - S- Corporation Income Tax Return

G-45 General Excise/Use Tax Return

HW-14 - Withholding Tax Return

HW-3  Employer's Annual Return and Reconciliation of Income Tax Withheld From Wages


We are well-versed in business tax and accounting and can work with any business including partnerships,
S-corporations, C-Corporations, LLCs, corporations, and non-profits.

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Serving small to mid-size companies of all industries.

Diamond Head Tax Group is a Honolulu locally owned and operated business that serves individuals and small and medium business. Services include tax planning and preparation, charitable tax planning strategies, social security taxation reduction, sales tax preparation, small business strategy development, QuickBooks setup, and payroll services. Clients appreciate Diamond Head Tax Group's help, advice, flexible hours, and thoroughness.


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Tax Planning

Sales Tax Preparation

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 Oahu Tax Services

We help individuals and businesses with tax advisory and payroll services.

Talk to one of our Oahu Tax Professionals today to start saving.

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