Quarterly 1040-ES Estimated Payment Calculator 2027

Calculate 2027 quarterly estimated tax (1040-ES) payments — required if you owe $1k+. Safe-harbor 100%/110% prior year rule for self-employed and side hustlers.

Ad Space

Who Must Pay Estimated Tax

Self-employed, freelancers, landlords, investors, retirees with portfolio income. Required if you'll owe $1,000+ when filing. W2 with adequate withholding usually safe.

Safe-Harbor Rules

Pay the LESSER of: 90% of current year tax OR 100% of prior year tax (110% if prior AGI > $150k). Avoids underpayment penalty regardless of actual tax.

2027 Quarterly Due Dates

Q1: April 15, 2027 (covers Jan-Mar). Q2: June 15, 2027 (covers Apr-May, weird 2-month). Q3: Sept 15, 2027 (covers Jun-Aug). Q4: January 15, 2028 (covers Sep-Dec).

Underpayment Penalty

IRS charges short-term federal rate + 3% (~8% in 2027). Calculated per quarter on amount underpaid. File Form 2210 to compute. Annualized income exception for irregular cash flow.

Source: irs.gov Form 1040-ES instructions 2027. Last updated: May 2026.