# Starting a business: from idea to company Updated : 2026-10-24 · Source : https://legalrapide.fr/en/entreprendre/ Find an idea[Validate your idea](#idee)[Cost your project](#chiffrer)[Funding](#financer)[Get support](#accompagner)[Choose your structure](#cadre)[Launch](#lancer)[Set up your company](#creer) Cost your project What margin for a SaaS or an AI service? AI usage costs, payment fees, break-even point. ## Find an idea ### An AI phone receptionist for tradespeople: is there still room in 2027? Seven French offerings already live, the angle that remains open and a ten-interview test. ## Validate your idea ### How do you validate a SaaS idea before setting up your company? Interviews, a payment test and criteria for deciding. ## Cost your project ### What margin for a SaaS or an AI service? AI usage costs, payment fees, break-even point. ## Funding ### How do you fund the creation of your business in 2027? Own funds, Arce, honour loan, bank, investors: the order to follow. ## Get support ### Which competitions and programmes can help launch your startup in 2027, in France and abroad? Even at the idea stage: i-Lab, Pépite, Moovjee, Korea, Chile, Spain. ## Choose your structure ### Micro-entreprise or company to launch a SaaS or an AI agency? Turnover caps, VAT, protection and credibility. ## Launch ### What changes for business founders in 2027? Issuing e-invoices, thresholds, AI. ## Set up your company ### How do you set up a SASU in 2027, and what does it cost? From €0 excl. VAT with the Essentiel plan: only the legal fees, €223.56 incl. VAT at current rates.