What is co-financing in EU grants?
Co-financing means an EU grant covers only part of a project's cost and the beneficiary must fund the remainder from other sources. The EU share is set by the call, and the rest has to be real, traceable money or eligible in-kind contribution — not a discount you negotiate.
Co-financing is the single most common reason a well-designed project becomes undeliverable. The science is fine, the partners are willing, and then somebody works out that 40% of a substantial budget has to come from somewhere real.
The basic arithmetic
A call states a co-financing rate — the share of eligible costs the EU will reimburse. Everything else is yours to find.
Two things make this less simple than it sounds.
“Eligible costs” is not “what the project costs.” Every programme has rules about what can be claimed: which staff costs, at what rates, which overheads, which subcontracting, which equipment (often only its depreciation over the project, not its purchase price). Costs the programme considers ineligible are 100% yours, on top of your co-financing share. A budget built from your own cost accounting rather than from the call’s eligibility rules will always be wrong, and always in the same direction.
The rate can differ between partners. In several programmes a university and a company doing identical work in the same consortium receive different rates. Build the budget per partner, not as one pot.
Where your share can come from
Broadly acceptable: your own cash reserves, revenue, bank finance, investment, and money from a source that is not EU funding for those same costs. National or regional funding sometimes qualifies — sometimes explicitly does not, if it is itself EU-derived. This is a question with a specific answer per call, and the National Contact Point will give it to you for free.
In-kind contributions are accepted by some programmes: staff time your organisation already pays for, use of existing equipment, sometimes volunteer time at a standard rate. Where allowed, they must be valued by the call’s method and evidenced like any other cost. Timesheets exist for this reason.
Double funding
The same euro of cost cannot be funded twice from EU sources. This is checked, and it is checked retrospectively during audit, which is a considerably worse time to discover a problem.
It does not prevent combining instruments intelligently. A project can have one funder for its research phase and another for deployment, or one fund covering equipment and another covering staff. What it prevents is the same invoice appearing in two claims. Keeping the cost boundaries clean from the start is far easier than reconstructing them two years later.
Cash flow is the real constraint
Grants generally reimburse costs you have already incurred and reported. There may be pre-financing at the start, and there is usually a retention held until the final report is accepted.
So the practical question is not “can we afford 40%?” but “can we afford to spend 100% and wait?” For a small company on a multi-year project, that gap is the thing that kills participation — and it is entirely predictable at proposal stage, which is when to model it rather than after the grant agreement is signed.
Four mistakes that recur
- Budgeting from internal cost accounting rather than the call’s eligibility rules.
- Assuming one rate across a mixed consortium.
- Counting in-kind that the programme does not accept, or accepting it without the evidence to support it.
- Ignoring the retention — planning as though the final instalment arrives on the last day of the project.
Where this appears
Co-financing applies across Horizon Europe, LIFE, Digital Europe, the structural funds and most national schemes derived from them — with different rates and different eligibility rules in each. The concept transfers; the numbers never do.
Each call’s conditions document is the authority. Read it before the budget spreadsheet exists, because a budget built on the wrong assumption is not adjusted later — it is rebuilt.
Frequently asked questions
What is co-financing?
Co-financing is the principle that an EU grant pays a percentage of a project's eligible costs and the beneficiary provides the rest. If a call offers 60% co-financing on a project with 100,000 euro of eligible costs, the grant is 60,000 and you must fund 40,000 from your own or third-party resources.
What can count as my share of the co-financing?
Usually your own cash, revenue, bank borrowing, or funding from another source that is not itself EU money for the same costs. Some programmes accept in-kind contributions such as staff time or use of equipment, valued according to the call's rules. What almost never counts is unquantified effort or goodwill.
Can I use one EU grant to co-finance another?
No. Double funding of the same cost from two EU sources is prohibited across programmes. You can combine different funds on different parts of a project, but each individual cost item can be claimed once only, and auditors check this.
Is the co-financing rate the same for everyone?
No. It varies by programme, by type of action, and often by the type of participant. In several programmes non-profit and research organisations receive a higher rate than for-profit companies for the same work. Read the call conditions before building a budget.
Does co-financing have to be available up front?
Effectively yes. Grants are usually reimbursed against costs already incurred, sometimes with a pre-financing instalment. You need the cash flow to spend first and be repaid later, which is a bigger constraint for small organisations than the rate itself.
By · Last reviewed: 2026-08-12