Agent fees: a small line that can change your entire buy or rent decision

Real estate agent fees often look secondary compared with purchase price or mortgage rate. Yet at 3–5 % of the sale price, they typically represent €10,000–€20,000. To decide whether to buy or rent, you need to understand who really pays the commission and how it affects your budget and your simulation.

In our buy or rent simulator, these costs are captured by the montant_fa parameter (amount of agent fees). Depending on whether the commission is legally paid by the seller or the buyer, the total cost of the deal and the notary fees change significantly.

How real estate agent fees work

Percentage, fixed fee and “FAI” prices

In France, agent commission is usually a percentage of the sale price:

Listings must clearly state whether the displayed price is:

Example: a flat listed at €300,000 FAI with a 5 % commission means:

In the buy or rent simulator, this €14,286 would correspond to the montant_fa if it is paid in addition to the taxable base.

Who is supposed to pay agent fees?

Legally, the agent is paid by whoever signed the mandate, usually the seller. In practice, you will see three main structures:

This wording appears on the mandate and in the ad. It changes not only who writes the check, but also the basis for notary fees and your total cost of acquisition.

Fees “paid by the seller”: what really happens

On paper: the seller pays

When the ad says “fees paid by seller”, it sounds like the buyer doesn’t pay anything. In reality:

Economically, the buyer still pays the full amount, since they are the one bringing €300,000 to the table; the fee is simply taken out of what the seller receives.

Impact on notary fees

The key point for your buy or rent calculation: when fees are “paid by the seller”, notary fees are computed on the FAI price.

Using the same example:

Estimated notary fees: 300,000 × 7.5 % = €22,500.

Total cost for the buyer:

In this case, in the buy or rent simulator you would typically enter:

The commission is then implicitly included in the purchase price.

Consequences for the seller

What matters to the seller is the net amount they receive. If they want €300,000 net and the agency charges 5 %, the FAI asking price must be:

FAI price = 300,000 / (1 − 0.05) = 300,000 / 0.95 ≈ €315,789

This higher price can slow down the sale, which in turn affects a seller who needs to buy again and is also running buy or rent scenarios for their next home.

Fees “paid by the buyer”: the notary-fee advantage

Different legal structure

When the ad says “fees paid by buyer”, the deal is structured differently. The contract distinguishes:

This directly affects notary fees and therefore the total cost of the transaction.

Full numerical example

Let’s reuse the same flat, but now with fees paid by the buyer:

In the purchase contract, you will see:

Notary fees (old property, 7.5 %) calculated on net seller price only:

285,714 × 7.5 % ≈ €21,429

Total cost for the buyer:

Compared with the “fees paid by seller” case, the buyer saves:

322,500 − 321,429 ≈ €1,071

This may look small, but it matters in a tight buy or rent analysis, especially once you add other parameters such as current mortgage rates (~3.6 %), borrower insurance, property tax and maintenance.

In the buy or rent simulator, you would model this as:

Here, montant_fa is an extra cost that does not generate notary fees.

How agent fees affect the buy or rent trade-off

Upfront cost vs staying a renter

Agent fees are a one-off entry cost, like notary fees. They are sunk money: you don’t get them back when you sell (unless the market has risen enough to offset them). In a buy or rent comparison, you should weigh them against:

Example:

The extra ~€6,700 you could have earned is part of the opportunity cost of buying, and should be captured in your buy or rent simulation through the investment rate parameter.

Effect on minimum holding period

The higher your entry costs (notary fees + montant_fa), the longer you need to stay in the property for buying to make sense versus renting.

Assume:

36,500 / 1,100 ≈ 33 months. Very roughly, it takes about 3 years of rent just to break even with those upfront costs, before even considering:

This is why, on a short time horizon (2–3 years), buying can be less attractive than renting when agent and notary fees are high.

Negotiating agent fees: real impact on your numbers

Cutting the percentage: how much do you really save?

Suppose a property listed at €300,000 FAI with 5 % fees, “paid by buyer”:

You negotiate the commission down to 3.5 % without changing the net seller price:

Direct saving on agent fees:

14,286 − 10,000 = €4,286

Notary fees are still computed on €285,714, so they remain unchanged. In your buy or rent simulation, you simply reduce:

This immediately improves the “buy” scenario.

Negotiating total price vs negotiating the fee

Another common situation: you negotiate the global FAI price, without distinguishing between net seller and commission.

If the property is €300,000 FAI (fees paid by seller), and you get €290,000 FAI with a 5 % commission:

Agent fee:

You gained €10,000 on the FAI price, but only about €476 on the commission. Most of the effort came from the seller. In the buy or rent simulator, you would update the purchase price and, if you know it, the new montant_fa.

Agent fees and the other hidden costs of owning

Don’t look at fees in isolation

Agent fees are only one piece of the ownership puzzle. In a realistic buy or rent comparison, you must also factor in:

All of these must be compared with renting costs (rent + renter’s insurance) and what your savings could earn if not locked into a property (investment rate, adjusted for inflation).

Global example: ownership vs renting

Old flat, FAI price €300,000, fees “paid by buyer” (5 %):

Total entry costs:

14,286 + 21,429 + 10,000 = €45,715 (excluding down payment on the price itself)

If you rent an equivalent place instead:

Total entry cost as a tenant: ≈ €2,000, over 20 times less than buying. The €40,000+ difference can be invested and grow over time. This is precisely what a serious buy or rent tool should factor into its projections.

How to enter agent fees in a buy or rent simulator

The role of montant_fa

In a tool like buy-or-rent.net, the montant_fa parameter is used to isolate the part of agent fees you pay on top of the price that serves as the basis for notary fees. You should therefore distinguish:

This allows the simulator to correctly compute:

Check the listing and the purchase contract

Before running a buy or rent simulation, make sure you know:

With that information, you can input a realistic montant_fa and get a more accurate buy or rent result.

Conclusion: does the seller or the buyer really pay?

Whether the agent fees are legally paid by the seller or by the buyer, they are always economically borne by both parties through the final price. The real differences are:

There is no universal answer to whether you should buy or rent; it always depends on your personal situation, your goals, your finances and your local market. This article is for information only and is not personalized financial advice.

To see how agent fees (montant_fa) change the outcome for you, the most robust approach is to run the numbers with and without different fee structures.

Simulate your situation on buy-or-rent.net and compare, with the same assumptions, buying with various agent-fee scenarios versus renting and investing your savings.

⚠️ Disclaimer: This article is for informational purposes only and does not constitute personalized financial advice. Consult a professional for your situation.

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