True Cost Of Real Estate Commission Calculator

Background.

A real estate commission looks modest because it is quoted against the price of the house, not against the part of the house the seller actually owns. Five percent of a $500,000 sale is $25,000. If $300,000 of that price goes to pay off the mortgage, the seller's equity is $200,000, and the commission takes 12.5% of it. For someone who bought recently or with a small down payment, the share can be much larger, which is the real sense in which commission is expensive.

The arithmetic is simple, but a few details move the figure. The rate you enter should be the total paid out of the sale, covering the listing brokerage and any buyer's-agent compensation the seller agrees to fund. Since the National Association of Realtors settlement rules took effect in August 2024, offers of buyer-agent pay no longer appear on MLS listings and buyers sign written agreements with their own agents, so whether the seller covers that side is now an explicit term of the deal rather than an assumption. Every rate is negotiable. A total of around 5% to 6% has long been common in the US, and each percentage point on a $500,000 sale is worth $5,000.

The tax field is for places where the commission itself is taxed as a service. In Canada GST or HST is charged on it, 13% in Ontario for example. US sellers rarely see such a line on the broker's invoice, so most should leave it at zero.

What remains, sale price less commission, is not what lands in your account. The mortgage payoff, transfer taxes, title and escrow or attorney fees, and any credits to the buyer all come out of the same closing statement.

What is true cost of real estate commission calculator?

The true cost of a real estate commission is everything the seller pays the brokerages for the sale: the agreed percentage of the contract price plus any tax charged on that fee. It is normally deducted from the proceeds at closing rather than paid out of pocket. The page reports that cost in dollars alongside the part of the sale price left once it is removed. Other closing costs and the mortgage payoff are not included.

How to use this calculator.

1. 01Enter the contract price from the purchase agreement in Sale price, before any credits to the buyer or repair allowances.
2. 02Enter the combined rate in Total commission rate: the listing side plus any buyer's-agent compensation you have agreed to pay. A 2.5% and 2.5% split is entered as 5.
3. 03Fill in Tax on commission only when a tax is added to the broker's fee, such as 13% HST in Ontario. Most US sellers leave it at 0.
4. 04Set the result against your equity, the sale price minus your mortgage balance, and try a few rates to see what a half-point negotiation is worth: $2,500 on a $500,000 sale.

The formula.

Commission = sale price × commission rate ÷ 100. Tax = commission × tax rate ÷ 100. Total cost = commission + tax, which is the same as price × rate × (1 + tax rate), and the second output is sale price − total cost. The tax applies to the commission, not to the house, so 13% HST on a 5% commission adds 0.65% of the price rather than 13%. Everything is straight multiplication, so the cost scales in direct proportion to both price and rate: double either and the commission doubles. Flat-fee listings and tiered schedules, where one rate applies up to a price threshold and a lower one above it, are not modelled. For those, work out the overall percentage first and enter that as the rate.

A worked example.

Frequently asked questions.

References& sources.

1. [1]OpenStax, Rice University. Principles of Finance, 2022. Chapters 6–10. Retrieved 2026-08-06.
2. [2]U.S. Internal Revenue Service. Tax guidance current 2026. Official forms, instructions and tax topics. Retrieved 2026-08-06.
3. [3]U.S. Securities and Exchange Commission. Investor.gov current 2026. Investment products and risk. Retrieved 2026-08-06.