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Start-ups

Starting a business: from idea to company

Before you set up a company, there is an idea to validate, numbers to work out and a structure to choose. Calculators and practical guides for founders of SaaS, AI services and online businesses, with the official thresholds in force until 2028.
Validate my idea →Cost my project
By Razvan Toma · Founder

Last updated 24 October 2026

Cost your project

What margin for a SaaS or an AI service?

AI usage costs, payment fees, break-even point.

Find an ideaAn AI phone receptionist for tradespeople: is there still room in 2027?Validate your ideaHow do you validate a SaaS idea before setting up your company?FundingHow do you fund the creation of your business in 2027?Get supportWhich competitions and programmes can help launch your startup in 2027, in France and abroad?Choose your structureMicro-entreprise or company to launch a SaaS or an AI agency?LaunchWhat changes for business founders in 2027?Set up your companyHow do you set up a SASU in 2027, and what does it cost?

Find an idea

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.

Find an ideaAn AI customer service agent for online shops: is there room for a newcomer?Specialise, test on a hundred real tickets, disclose the AI.Find an ideaBringing very small businesses into line with e-invoicing: a service worth launching?A time-limited window before September 2027, and two legal limits.

Validate your idea

Validate your idea

How do you validate a SaaS idea before setting up your company?

Interviews, a payment test and criteria for deciding.

Validate your ideaCan you invoice before receiving your Kbis?What a company in formation allows.Validate your ideaCan you set up a company while staying employed?Exclusivity clause, duty of loyalty, working time.

Cost your project

Cost your project

What margin for a SaaS or an AI service?

AI usage costs, payment fees, break-even point.

Cost your projectWhat budget do you need to launch your business?Start-up spending, running costs and months covered by your own funds.Cost your projectHow much does it cost to set up a company?The calculator for the legal fees in force.

Funding

Funding

How do you fund the creation of your business in 2027?

Own funds, Arce, honour loan, bank, investors: the order to follow.

FundingWhich company structure should you choose to raise funds?SAS, BSPCE, share-transfer approval in a SARL: what investors expect.FundingGrants, loans and investors: the verified listMore than a hundred funding sources with their official link (CSV, JSON).

Get support

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.

Get supportWhere can you find a coworking space in France in 2027?Spaces by city, and what to check before using one as your company's registered address.Get supportCompetitions and programmes abroad: the verified listPublic programmes that welcome French startups (CSV, JSON).

Choose your structure

Choose your structure

Micro-entreprise or company to launch a SaaS or an AI agency?

Turnover caps, VAT, protection and credibility.

Choose your structureSASU or EURL: which should you choose?Director status, social charges, dividends.Choose your structureSetting up a SASU while receiving ARE?Keeping your unemployment benefits and paying yourself.Choose your structureHow do you move from a micro-entreprise to a company?The steps and the right time.

Launch

Launch

What changes for business founders in 2027?

Issuing e-invoices, thresholds, AI.

LaunchE-invoicing: what is mandatory?Receiving, issuing, approved platform.LaunchWhat are your obligations in the first year?The calendar to follow.

Set up your company

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.

Set up your companyWhich documents do you need to set up your company?The list for your situation.Set up your companySet up my company in 5 minutesThe questionnaire, then filing with the greffe.

Ready to form your company?

5-minute questionnaire, total shown before you pay.

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