Quarterly Estimated Taxes for Small Businesses: 2026 Rules
Check the 2026 IRS estimated-tax test, safe-harbor amounts, and calendar-year payment dates. Estimate from your own tax picture instead of using a flat deposit percentage.
Last updated: October 9, 2026
Direct answer
For 2026, individuals generally must make estimated-tax payments when they expect to owe at least $1,000 after withholding and refundable credits and expect withholding/credits to be below the smaller of 90% of 2026 tax or 100% of 2025 tax (110% of 2025 tax if 2025 AGI exceeded $150,000 ($75,000 if filing married separately for 2026), subject to exceptions). The standard calendar-year 2026 installment dates are April 15, June 15, September 15, 2026, and January 15, 2027. Exceptions apply.
Why estimates need a calculation
Estimated payments are part of the federal pay-as-you-go system. A flat percentage of each deposit can understate or overstate what is due because tax depends on net profit, other income, withholding, credits, deductions, filing status, and payment timing. State rules may use different thresholds and dates.
Estimate annual tax, then follow installment rules
The IRS test includes both an expected-balance threshold and a withholding/credit safe harbor. Payments can be subject to an underpayment penalty when not enough was paid by a required date, even if a balance is paid with the return. Uneven income may call for the annualized-income method.
A careful estimated-tax routine
- 1
Check the general 2026 estimated-tax test
In most cases, estimates apply if you expect to owe at least $1,000 after withholding and refundable credits and withholding/credits are below the smaller of 90% of 2026 tax or the prior-year safe harbor. If 2025 AGI exceeded $150,000 ($75,000 if filing married separately for 2026), use 110% of 2025 tax for the prior-year amount. Special rules apply to farmers and fishers.
- 2
Use the standard calendar-year dates
The 2026 Form 1040-ES lists April 15, June 15, and September 15, 2026, and January 15, 2027. The periods are not four equal calendar quarters; check Form 1040-ES for exceptions and payment instructions.
- 3
Estimate your full tax, not a share of each sale
Use expected business net profit, other income, deductions, credits, withholding, self-employment tax, and prior-year tax. The official worksheet is the place to calculate a required annual payment.
- 4
Choose a reserve as a cash-management decision
There is no universal IRS percentage of each payment. A separate savings account can help, but set the amount from your estimated liability and update it as income and withholding change.
- 5
Account for uneven income
If earnings are seasonal or uneven, Publication 505 and Form 2210 describe the annualized-income method and other exceptions. Do not assume equal installments always fit.
- 6
Keep payment records and check state rules
Save confirmations and reconcile withholding and estimated payments when filing. State and local payment rules, dates, and thresholds are separate from federal rules.
Key takeaways
- The $1,000 expected-balance test is only one part of the general estimated-tax rule.
- For 2026, standard calendar-year due dates are April 15, June 15, September 15, 2026, and January 15, 2027.
- Use expected income, withholding, credits, deductions, self-employment tax, and the prior-year safe harbor.
- A reserve percentage is a cash-management choice, not an IRS calculation.
- Uneven income and state taxes require additional rules and dates.
Frequently asked questions
What are the 2026 estimated-tax due dates?
For calendar-year individuals, the standard dates are April 15, June 15, and September 15, 2026, and January 15, 2027. Check Form 1040-ES for holidays, tax-year differences, and other exceptions.
Do all small-business owners have to pay quarterly?
No. The general rule considers expected tax after withholding and refundable credits plus a current-year or prior-year safe harbor. Entity type, wages, withholding, and special rules can change the result.
How much should I set aside?
There is no universal percentage. Estimate your full-year tax using expected net profit, other income, withholding, credits, deductions, filing status, entity, and state/local rules. A reserve helps cash flow but does not establish the installment amount.
What if my income is seasonal?
The annualized-income installment method may change how much is due in each period. Review Publication 505 and Form 2210 or ask a qualified tax professional.
Do state estimated-tax dates match federal dates?
Not necessarily. Check your state and local tax authority for its own thresholds, payment periods, and due dates.
Related guides
Official sources
- 2026 Form 1040-ES (IRS)
2026 estimated-tax test, payment dates, worksheets, and safe-harbor instructions.
- Publication 505 (2026), Tax Withholding and Estimated Tax
Estimated-tax rules, withholding, underpayment timing, and annualized-income method.
- IRS: Underpayment of estimated tax by individuals
General information on underpayment penalties.
- IRS Topic 554: Self-employment tax
Self-employment tax base, Social Security and Medicare rates, and Additional Medicare Tax thresholds.
Educational information only; not individualized legal, tax, accounting, or financial advice. Rules can change and results depend on your facts. Check current official guidance or consult a qualified professional.