One measure drew wide comment this week: the so-called parenthood PTZ, written into article 7 of the finance bill for 2027, tabled on 1 October and debated in the chamber since 13 October. The idea appeals, it chimes with the current mood on the birth rate. For a Paris couple needing to push the walls out when a second child arrives, it will change almost nothing.

The reason comes down to one line of zoning. Paris lies in zone A bis, and in that zone the PTZ has only funded new-build since 2024. A four-room older flat in the 15th, a Haussmann in the 17th, a family home in the 11th: none of it qualifies, whatever the buyer's income or deposit.

This issue puts the parenthood PTZ in its proper place, describes what a growing Paris family actually faces, and names the three levers that do bear on the project: borrowing capacity, deposit and negotiation.

Parenthood PTZ: what the PLF 2027 changes for a Paris family, or does not

The 2027 finance bill creates a PTZ reserved for young parents. The announcement is loud, the actual measure more modest, and its effect in Paris virtually nil. A reading for a couple that needs more space.

First, the calendar. The finance bill for 2027 was tabled in the National Assembly on 1 October 2026, and its chamber debate began on 13 October. In between, the finance committee adopted on 8 October a MoDem amendment raising the parenthood PTZ to a maximum of €100,000, scrapping the income condition and extending eligibility to children under 5. The following day, that same committee rejected the first part of the budget: the changes voted the day before do not automatically form the text now being debated in the chamber. As of 14 October, no bank can grant this loan. The scheme is under discussion, not in force.

The government's version runs to a few lines. Article 7 creates a derogation to the first-time buyer condition: at the date of the offer, the borrower must prove an expected child or effective care of a child under three. A household that has already received a PTZ may receive one again, under income conditions, but this parenthood PTZ can only be used once per beneficiary. The text as tabled sets no specific amount: the figures of €100,000 or €180,000 circulating in the press do not appear in article 7. The PLF also plans to remove the annual PTZ spending cap, currently set at €2.1 billion.

Then comes the zoning, and that is where the matter is settled for Paris. Since 2024, in zones A, A bis and B1, the PTZ has only funded new-build. Older stock with works only qualifies in zones B2 and C, meaning mostly the outer suburbs and the provinces. Paris falls in zone A bis, as does its inner ring. An older flat in the 11th, the 15th or the 18th is therefore not eligible, whatever the buyer's income, deposit or renovation budget. The operation caps in A bis, €225,000 for a couple, €270,000 with a child, finish disqualifying the measure in the capital: at €9,630 per square metre on average on 1 October 2026 according to MeilleursAgents, those sums cover a surface unrelated to a family home.

Take a common scenario. A couple in their thirties, one child, a second on the way, owners of a 61-square-metre three-room flat bought six years ago in the 11th. They are after a four-room older flat, close to their current building. The price gap is brutal: a Paris three-room sells on average at €602,000 for 61 square metres, a four-room at €1,077,000 for 100 square metres, a jump of close to €475,000. The parenthood PTZ, in its current version, does not concern their project, since they are buying older stock in zone A bis. Were they to turn to an eligible Paris new-build programme, the operation cap would make the scheme marginal against the actual price.

The real obstacle lies elsewhere. Four-room flats and larger make up less than 15% of the Paris housing stock: the scarcity is structural, and it dictates timelines as much as prices. On top of that scarcity comes the cost of credit. In October 2026, average rates after negotiation stand around 3.40% over 15 years, 3.50 to 3.55% over 20 years and 3.60 to 3.65% over 25 years at Meilleurtaux; Cafpi records 3.51% over 20 years on 17 October, after two successive ECB rate hikes, now at 2.65%. The usury rate, set by the Banque de France at 5.40% on 1 October for fixed-rate loans of 20 years and over, leaves some headroom. The monthly cost, however, remains the binding constraint.

What then to do when one lives this equation? Three levers matter, none depend on the PLF. Borrowing capacity is worked out with a broker before any viewing: knowing your envelope allows you to arbitrate between arrondissement, surface and condition. The deposit, combined with the resale proceeds of the current flat, determines the real ticket within reach. Finally, negotiating on the chosen property remains the lever most often underestimated by buyers who venture out alone: in Paris, in a market where older-stock sales rose 4% year on year between May and July 2026 according to the Notaires du Grand Paris, the gap between asking and signed price is settled case by case, and always on precise elements of the file.

Set your own equation before waiting on a scheme

The trap, at every tax or budget announcement, is to suspend a project in the hope of a measure that, for a Paris buyer, almost never applies. The parenthood PTZ illustrates the point: in Paris, in zone A bis, older stock does not qualify, and the operation caps, €225,000 for a couple, €270,000 with a child, bear no relation to a four-room flat at €1,077,000 on average.

Set your own equation instead, in three steps. First, ask a broker for a precise borrowing capacity simulation, at October 2026 rates (around 3.51% over 20 years) and with the 5.40% usury rate as a backdrop. Second, have your current flat appraised by two independent professionals, and deduct the selling costs to obtain the net deposit available. Third, cross that envelope with compatible arrondissements: at €9,630 per square metre on average, 100 square metres force trade-offs on location.

This discipline changes the decision. It tells you whether to sign now, whether to wait six months to build up additional deposit, or whether to revise the brief. Above all, it stops a political announcement from dictating a calendar that depends on you alone.

In the meantime, if a project is taking shape, Home Select remains at your disposal for an initial conversation: its hunters assess your brief against the market and deliver an unvarnished reading.