Our Address
Individuals ● Business ● Tax Advisory ● Payroll Services
1441 Kapiolani Boulevard Suite 912
Honolulu, HI 96814
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.
If you have clients who are residents or have been involved in significant business operations within Hawaii, then they might be required to file Hawaii State Taxes. On this page, we will cover the most important tax deadlines and tax extensions for Hawaii S Corporation and C Corporation businesses in 2024.
Hawaii Business Tax Deadlines for 2024
Hawaii C Corporation Tax Deadlines for 2024
You must file & pay Corporate Income Taxes in Hawaii on behalf of your clients
by April 20, 2025. Here are the steps:
File Online with
Hawaii Tax Online
File by Mail must be postmarked by the due date.
Form N-30 – Hawaii Corporation Income Tax Return
Pass-Throughs Hawaii S Corporation & Partnership Tax Deadlines for 2024
You must file in Hawaii on behalf of your clients by April 20, 2025. Here are the steps:
File Online with
Hawaii Tax Online
File by Mail must be postmarked by the due date
Form N-35 – S-Corporation Income Tax Return
Form N-20 – Partnership Return of Income
Extension to File Taxes in Hawaii for 2024
You must send a payment for taxes in Hawaii for the fiscal year 2024 on behalf of your clients
by April 20, 2025.
The Extension Deadline to file your Hawaii corporate income tax return is November 20, 2025.
October 20, 2025 is the Extension Deadline for Hawaii pass-through entity tax return.
Hawaii automatically grants 6 months extension on filing on both corporate income tax returns and
pass-through entity tax returns. This means you do not need to file for an extension in Hawaii.
This is an extension to FILE, not an extension to PAY – payment is still due April 20, 2025.
BUSINESS TAX FILING
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.
Tax Filing
Income Tax Return,
Bit Coin,
Rental Properties
and..more!
Let's Save You Money this
Tax Season
Tax Services. Financial Consulting. Let Us Do the Math.
The best solution for tax advisory, strategy, and payroll.
Skilled Oahu Tax Experts
Well Rounded Tax Advice
Tailored Tax Solutions
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.
OUR TAX SERVICES
Tax Preparation
Tax Planning
Sales Tax Preparation
Professional Payroll Services
Small Business Strategy
Roth IRA Conversion
Charitable Tax Planning
QuickBooks set up
Social Security Taxation Reduction
FEATURED ON
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.
