Real Estate Agent Quarterly Tax Calculator (2026)

2026 due dates

The "quarters" aren't equal. The second one is only two months long. If you file your 2026 return and pay everything by February 1, 2027, you can skip the January payment.

How the math works

SE earnings         = net self-employment income × 92.35%
SE tax              = 12.4% Social Security on SE earnings up to $184,500 (minus W-2 wages)
                    + 2.9% Medicare on all SE earnings
Additional Medicare = 0.9% of SE earnings over $200,000 single / $250,000 joint (minus W-2 wages)
AGI                 = net SE income + W-2 wages − half of SE tax
Taxable income      = AGI − standard deduction ($16,100 single / $32,200 joint)
                      − QBI deduction (20% of net SE income minus half of SE tax,
                        no more than 20% of taxable income)
Income tax          = 2026 brackets applied to taxable income
Quarterly payment   = (income tax + SE tax + additional Medicare − withholding) ÷ 4

The QBI deduction shrinks at higher incomes. For 2026 it starts to phase down once taxable income passes $201,750 (single) or $403,500 (joint), and it's gone $75,000 ($150,000 joint) above that if your business pays no W-2 wages. That's how this calculator handles it. Most solo agents pay no W-2 wages. If you have an S corporation or employees, the numbers change, so ask your tax pro.

Worked example (the default numbers)

Example inputs, not an average agent's income. State income tax isn't included.

Safe harbor: the minimum that avoids the penalty

You generally won't owe the underpayment penalty if withholding plus on-time estimated payments cover the smaller of:

• 90% of your 2026 tax, or
• 100% of the tax on your 2025 return (110% if your 2025 AGI was over $150,000, or $75,000 married filing separately).

You also won't owe it if you'll owe less than $1,000 after withholding. The prior-year rule is the one agents lean on when income swings, because it's a number you know in April, before you know how the year will go. Enter last year's total tax above and the calculator uses whichever minimum is lower.

Uneven closings: the annualized method

By default the IRS expects four equal payments. If you closed nothing until July, that default says you underpaid in April and June. The annualized income installment method on Form 2210 (Schedule AI) figures each payment from what you'd actually earned by that date, which can shrink or wipe out the penalty for the early quarters. It's extra paperwork, usually handled by tax software or your preparer. Keep a record of the date each commission check came in so they can do it.

A system for each commission check

1. When a check lands, move the set-aside percentage from the calculator into a separate savings account that day. Add your state's rate on top.
2. On each due date, pay from that account through IRS Direct Pay or your IRS online account.
3. Re-run the calculator after any big closing. The payments aren't fixed, so you can raise the next one.
4. Log expenses as you go in the expense tracker. Every deductible dollar lowers your net income here. The tax deductions checklist covers what counts.

General information for planning, not tax advice. It leaves out state tax, credits, itemized deductions, retirement contributions and self-employed health insurance, which can all lower what you owe. Check with a tax professional before you pay.

Sources

• IRS Form 1040-ES (2026): who must pay, due dates, safe harbor
• IRS, 2026 inflation adjustments (brackets and standard deduction)
• IRS Rev. Proc. 2025-32 (2026 QBI thresholds)
• IRS Topic 554, Self-employment tax
• IRS Topic 306, Penalty for underpayment of estimated tax
• IRS, Questions and answers for the Additional Medicare Tax
• SSA, 2026 fact sheet (wage base $184,500)

Checked Oct 26, 2026.

Related free tools and guides

• Expense Tracker and 2026 Mileage Log: log expenses and set aside part of each check.
• Tax deductions checklist: the deductions 1099 agents use most.
• Commission Split Calculator: your take-home on one deal after referral fee, brokerage split, cap and fees.
• Income Goal Calculator: turn a take-home goal into closings, appointments and leads per week.

FAQ

By Doorlark Editorial Team. For planning only, not legal, tax or financial advice.