“Wait, I have to pay taxes four times a year?”
If you’re new to business ownership or recently switched from W-2 employment, quarterly estimated tax payments can feel confusing and overwhelming. But they don’t have to be.
Here’s everything you need to know about quarterly taxes—explained simply, without the jargon.
What Are Quarterly Estimated Taxes?
When you’re an employee, your employer withholds taxes from each paycheck and sends them to the IRS throughout the year. As a business owner, nobody’s withholding taxes for you—so the IRS requires you to pay them quarterly instead of waiting until April.
Think of it as a pay-as-you-go system. The IRS wants their money as you earn it, not all at once next year.
Who Needs to Pay Quarterly Taxes?
You likely need to pay quarterly estimated taxes if:
✅ You’re self-employed or a business owner ✅ You expect to owe $1,000 or more in federal taxes for the year ✅ You don’t have taxes withheld from a W-2 job that covers your tax liability ✅ You’re a freelancer, independent contractor, or gig worker ✅ You have significant income from investments, rental properties, or other sources
Hawaii businesses: You also need to make quarterly Hawaii state tax payments in addition to federal.
When Are Quarterly Tax Payments Due?
Quarterly taxes aren’t actually quarterly—the IRS uses a quirky schedule:
|
Period Covered |
Due Date |
|
January 1 – March 31 |
April 15 |
|
April 1 – May 31 |
June 15 |
|
June 1 – August 31 |
September 15 |
|
September 1 – December 31 |
January 15 (next year) |
Important: These dates are firm. If the due date falls on a weekend or holiday, the deadline moves to the next business day.
Mark your calendar now. Missing these deadlines triggers penalties—no exceptions.
How Much Should You Pay?
This is where most business owners get stuck. Here are three approaches:
Option 1: Safe Harbor Method (Easiest)
Pay 100% of last year’s total tax liability, divided by four.
Example: You owed $20,000 in taxes last year. Pay $5,000 each quarter this year.
Benefit: You won’t face underpayment penalties, even if you make more money this year. You’ll just owe the difference when you file.
Catch: If your income was over $150,000 last year (or $75,000 if married filing separately), you need to pay 110% of last year’s taxes to use safe harbor.
Option 2: Current Year Estimate (Most Accurate)
Estimate this year’s income and tax liability, then divide by four.
Example: You project $100,000 profit. Your estimated tax is $25,000. Pay $6,250 each quarter.
Benefit: Your payments match your actual income this year.
Risk: If you underestimate, you’ll face penalties. If you overestimate, you’re giving the IRS an interest-free loan.
Option 3: Pay as You Go (Most Flexible)
Adjust each quarter based on actual year-to-date income.
Example: Q1 was strong, so you pay more. Q2 was slow, so you pay less.
Benefit: Payments align with actual cash flow and income.
Requirement: You need accurate quarterly financials to calculate correctly.
Best for: Businesses with fluctuating or seasonal income.
What Taxes Do You Need to Pay Quarterly?
Your quarterly payments should cover:
Federal Taxes:
- Income tax on business profits
- Self-employment tax (Social Security and Medicare) – 15.3% on profits up to certain limits
Hawaii State Taxes:
- Hawaii income tax (rates from 1.4% to 11% depending on income)
- General Excise Tax (GET) – Due monthly, quarterly, or semi-annually depending on your filing status
Pro tip: Don’t forget self-employment tax. Many new business owners only calculate income tax and get hit with a massive surprise bill. Self-employment tax alone is 15.3% on your first ~$160,000 of profit (amount adjusted annually).
How to Make Quarterly Tax Payments
Federal Payments:
Online (easiest):
- IRS Direct Pay: irs.gov/payments (free, direct from bank account)
- EFTPS: eftps.gov (Electronic Federal Tax Payment System)
- Credit/debit card (convenience fees apply)
Mail:
- Use Form 1040-ES vouchers
- Mail check to appropriate IRS address
Hawaii State Payments:
Online:
- Hawaii Tax Online: hitax.hawaii.gov
- Create account and make estimated tax payments
Mail:
- Use Form N-1 vouchers
- Mail to Hawaii Department of Taxation
Pro tip: Pay online. It’s faster, you get instant confirmation, and there’s no risk of lost mail.
Common Mistakes to Avoid
❌ Waiting until year-end to think about taxes Start estimating and paying from Q1. Catching up later costs more in penalties.
❌ Only paying income tax and forgetting self-employment tax Self-employment tax is often bigger than income tax for small businesses.
❌ Missing deadlines Even one day late triggers penalties. Set calendar reminders two weeks before each due date.
❌ Not adjusting for income changes Had a big month? Adjust your next quarterly payment. Income dropped? You can reduce your payment.
❌ Ignoring state taxes Hawaii requires quarterly state estimated taxes. Don’t just pay federal.
❌ Forgetting about GET Hawaii’s General Excise Tax is separate from income tax and has its own payment schedule.
❌ Using last year’s numbers when income significantly increased Safe harbor protects you from penalties, but you’ll still owe the balance—and it could be large.
Penalties for Not Paying (or Underpaying)
The IRS charges penalties for:
- Underpayment: Paying less than 90% of current year taxes or 100% of prior year (110% if high income)
- Late payment: Missing the quarterly deadline
Current penalty rate: Varies quarterly, typically 7-8% annually (compounded daily)
Example: You underpaid by $5,000. Penalty could be $300-400 for the year.
Hawaii also charges penalties for underpayment and late payment of state estimated taxes.
Special Situations
You’re Having a Down Year
If your income drops significantly, you can reduce or skip quarterly payments. Just be prepared to explain why if the IRS questions it.
You Have a W-2 Job Plus Business Income
Your W-2 withholding might cover some or all of your tax liability. Calculate total expected taxes, subtract W-2 withholding, then pay the difference quarterly. Or ask your employer to increase withholding to cover business income.
Seasonal Business
Many Hawaii businesses (tourism, hospitality, retail) have seasonal income. Use the “pay as you go” method, paying more in profitable quarters and less in slow periods.
First Year in Business
No safe harbor option since you have no prior year taxes. Estimate carefully based on projected income or work with an accountant.
You Sold a Major Asset
Big one-time income events (selling property, equipment, investments) require adjusted quarterly payments to avoid underpayment penalties.
Quick Calculation Example
Let’s say you’re a Hawaii-based consultant:
Projected annual profit: $80,000
Estimated taxes:
- Self-employment tax: ~$11,300
- Federal income tax: ~$8,500
- Hawaii state income tax: ~$5,500
- Total: ~$25,300
Quarterly payment: $25,300 ÷ 4 = $6,325 per quarter
Plus GET (typically 4-4.5% on gross income) paid monthly or quarterly separately.
How We Help
Calculating quarterly taxes correctly requires:
- Accurate bookkeeping throughout the year
- Understanding current tax law and rates
- Projecting year-end income
- Accounting for deductions and credits
- Coordinating federal and state requirements
- Tracking GET separately
Most business owners either overpay (giving the government an interest-free loan) or underpay (triggering penalties).
At AIS Firm, we: ✅ Calculate your quarterly tax obligations accurately ✅ Remind you before each deadline ✅ Adjust estimates as your income changes ✅ Coordinate federal, state, and GET payments ✅ Help you avoid penalties while optimizing cash flow ✅ Provide year-round tax planning, not just quarterly calculations
Action Steps
Right now:
- Mark your calendar with all four quarterly deadlines
- Set up online payment accounts (IRS Direct Pay and Hawaii Tax Online)
- Calculate your estimated payments (or contact us to help)
Before next deadline: 4. Review year-to-date income and expenses 5. Calculate estimated tax liability 6. Make payment at least 2-3 days before due date 7. Save confirmation for your records
Ongoing: 8. Set aside 25-30% of revenue for taxes (adjust based on your situation) 9. Review quarterly with each estimated payment 10. Keep accurate books year-round
The Bottom Line
Quarterly estimated taxes don’t have to be complicated. The key is:
- Know the deadlines (and don’t miss them)
- Calculate accurately (or get help)
- Pay consistently (not all at year-end)
- Adjust as needed (income changes throughout the year)
Missing quarterly payments costs you money in penalties. But paying correctly gives you peace of mind and keeps you compliant.
Need Help Calculating Your Quarterly Taxes?
We help Hawaii business owners calculate accurate quarterly tax payments, avoid penalties, and optimize cash flow.
Let’s make sure you’re paying the right amount at the right time. Contact AIS Firm for a tax planning consultation. We’ll review your situation, calculate your quarterly obligations, and set up a system so you never miss a deadline.
Call, text, or email anytime—we’re here when you need us.
AIS Firm provides bookkeeping, fractional CFO services, and tax planning for Hawaii businesses. Based in Honolulu, we help clients stay compliant with federal and state tax requirements while optimizing cash flow.
