APL and CAF simulation for tenants in France

Social housing, housing aid & DALO 3 min read · published September 11, 2025

Understanding how APL simulation or checking benefits via the CAF can affect your budget helps tenants in France manage rent, prepare a file and avoid surprises. This article simply explains what "APL simulation" and "CAF" mean, what practical differences exist, which documents to gather and how to estimate your rights before signing a lease. You will also find concrete steps to simulate your benefits, tips to document your income and a reminder of the main rules that protect tenants in France.

Understanding APL, CAF and the idea of simulation

The "CAF" is the agency that pays several benefits, including APL for housing. The simulation provides a personalized estimate based on your family situation, income and the rent amount. An estimate is not a final decision: it forecasts a possible amount but the CAF will validate the request when it receives supporting documents.

The simulation provides an estimate; only the CAF decision is binding.

Why do a simulation?

  • Estimate the amount of aid to set a budget before signing the lease.
  • Determine which documents to prepare (tax notice, rental contract, bank details, etc.).
  • Know possible processing times to anticipate cash flow.
Run the simulation with current-year income for a realistic estimate.

How the simulation differs from an official request

The simulation is an estimation tool; the official request triggers administrative processing and requires the submission of supporting documents. When requesting, the CAF calculates precisely according to current rules and issues a decision that states the amount, payment date and any retroactive adjustments.

The simulation may change if your income or family situation changes between estimation and decision.

Common cases where the estimate diverges

  • If the actual rent considered differs from the amount entered during the simulation.
  • If supporting documents are missing or do not confirm the entered information.
  • If you fail to declare a change of situation (new child, separation, employment change).

Steps to simulate and apply for your benefits

  1. Gather your documents: identity papers, rental contract, tax notices and pay slips.
  2. Perform the simulation online on the CAF website or via the official simulator.
  3. Check the estimate and prepare the official request by attaching the required documents.
  4. Submit the request and follow the processing time indicated by the CAF.
Keep dated copies of all documents to simplify exchanges with the CAF if additional information is requested.

Your rights and protections as a tenant

In France, rental relationships are governed by the July 6, 1989 law and its amendments: lease durations, security deposits, repair obligations and notice procedures are defined to protect tenants and landlords[1]. For a rental contract, the inventory of fixtures and the written contract are essential and template documents are available on the official site.

A written rental contract and a precise inventory of fixtures protect your rights at move-in and move-out.

FAQ

What is the difference between an APL simulation and the CAF decision?
The simulation provides an indicative estimate; the CAF decision, based on supporting documents, determines the amount and payment conditions.
Can you get APL from the move-in date?
Yes, provided a request is filed and processed, the aid can be paid retroactively to the move-in date if all conditions are met.
What to do if the simulation differs greatly from the decision?
Contact your CAF, provide missing documents and, if necessary, request mediation via the departmental conciliation commission or bring the matter before the competent court.

How-To

  1. Gather identity papers, income proofs and evidence of rent amount.
  2. Perform the simulation on the CAF website by entering your data accurately.
  3. If satisfied with the estimate, prepare the official request and upload supporting documents.
  4. Monitor the request online and respond quickly to any request for additional documents.

Key takeaways

  • The simulation helps plan your budget but is not the final decision.
  • Completing documentation speeds up benefit payment.

Help and Support


  1. [1] Legifrance - Law n° 89-462 of July 6, 1989
  2. [2] Service-public.fr - Housing and benefits information
  3. [3] Legifrance - Codes and official texts
Bob Jones
Bob Jones

Editor & Researcher, Tenant Rights France

Bob writes and reviews tenant law content for various regions. They’re passionate about housing justice and simplifying legal protections for tenants everywhere.