Every other line item in this calculator’s seller-side closing cost breakdown is shaped by which state the property is in. Transfer tax runs from zero in a handful of states to a graduated bracket in New Jersey. Title insurance follows a different tiered rate table in every state. Escrow fees combine a state-specific base charge with a per-thousand rate. Agent commission is the one line that ignores all of that: it is calculated the same way, at the same rate, no matter where the home is.
How the brokerage line is actually calculated
In this calculator’s underlying cost function, the seller’s brokerage charge is simply the sale price multiplied by a commission percentage — nothing in that formula reads the state code. The function that computes it does accept a commission-rate input, which means the math underneath could run at any percentage a user supplied. But the live calculator never varies that input: every result on this site runs the seller side at a flat 5% commission, full stop.
- Transfer tax, title insurance, escrow, legal fees, and recording all pull from a per-state table with 17 different sets of numbers.
- Agent commission pulls from nothing state-specific — it is always sale price × 5%, the same formula whether the property is in Texas or New York.
- That makes it the single largest seller-side cost that this calculator treats as a national constant rather than a state variable.
A baseline, not a quote
This 5% figure is a planning assumption built into the calculator, not a real listing agreement. It exists so every MAO calculation has a consistent, comparable seller-cost estimate across states — not because every actual home sale in the country closes at exactly 5%.
Why 5% is a baseline and not a guaranteed number
Commission rates became more visibly negotiable after the National Association of Realtors settled a set of antitrust lawsuits over how agent compensation was set. The resulting rule changes took effect on August 17, 2024: a listing agent can no longer advertise an offer of compensation to a buyer’s agent directly on an NAR-affiliated MLS, and buyers’ agents now generally work under a signed agreement that spells out their own pay separately, rather than a rate baked into the MLS listing. See NAR’s own settlement facts page for the official rule summary.
A year-plus into those changes, reporting from the industry has not found commissions collapsing toward some new universal number — what changed is that buyer-side pay is now a separate negotiation rather than a default split baked into the listing. HousingWire’s look back at the first year describes buyers now having to negotiate their own agent’s pay directly instead of assuming the seller’s side covers it automatically. Practically, that means the total a seller ends up paying across both sides of a transaction can land above or below this calculator’s flat 5% baseline depending on the market, the brokerage, and what gets negotiated — which is exactly why this number is a planning assumption, not a quote.
What 4%, 5%, and 6% actually cost the seller
Because the formula is just price × rate, the dollar swing between commission rates is easy to see directly — and it is large relative to most of the flat-dollar fees covered elsewhere on this site. Every percentage point of commission is exactly 1% of the sale price, so the gap between a 4% and 6% deal widens fast as price goes up.
| Sale price | 4% commission | 5% commission (this calculator) | 6% commission |
|---|---|---|---|
| $300,000 | $12,000 | $15,000 | $18,000 |
| $500,000 | $20,000 | $25,000 | $30,000 |
| $800,000 | $32,000 | $40,000 | $48,000 |
That one-point swing on an $800,000 sale — $8,000 — is bigger than the combined attorney and recording fees covered in the attorney-state closing fee breakdown, and bigger than most states’ full title insurance premium on a mid-range home. Of every seller-side cost in this calculator, commission is both the flattest to model and the most consequential to get right when comparing it against a real listing agreement.
Where this shows up in a full offer calculation
On the maximum allowable offer side, this flat 5% commission assumption feeds directly into the disposition costs subtracted from after-repair value — the same seller-side math applies whether the eventual sale is a retail resale or part of a flip exit, because the calculator does not distinguish strategy when it applies the commission rate. If an investor already has a signed listing agreement at a different rate, the gap between that real number and this baseline 5% is worth running through by hand before trusting the calculator’s margin estimate as final.