2eme acompte IS calcul
Use this premium calculator to estimate the second corporate income tax installment commonly known in French practice as the 2eme acompte d’IS. The default logic follows the standard quarterly method: when the reference corporate tax base exceeds 3,000 euros and the company is not in its first taxable year, each installment is generally 25% of the reference amount.
- The first and second installments are usually equal under the standard quarterly method.
- The balancing payment at year end depends on the final tax due after all adjustments.
- This tool is educational and does not replace formal tax advice.
Understanding the 2eme acompte IS calcul
The expression 2eme acompte IS calcul refers to the method used to estimate the second installment of French corporate income tax, known as impot sur les societes or IS. In ordinary practice, companies subject to IS do not always wait until the final annual return to settle their liability. Instead, they often make advance payments during the year. Those advance payments are called acomptes, and the second one is often due around mid June when a company follows the standard quarterly filing rhythm.
At a practical level, many finance teams use a straightforward formula. If the company is not in its first taxable year and the relevant reference tax exceeds the threshold below which installments are not generally required, each quarterly payment is commonly calculated as 25% of the reference IS base. That means the second installment is usually identical to the first installment. This is why the most common search intent behind “2eme acompte IS calcul” is simple: business owners, controllers, accountants, and founders want to know exactly how much cash they need to reserve for the next payment date.
This page helps you estimate that amount quickly. The calculator above starts from a reference corporate tax amount, subtracts deductible credits or reductions entered by the user, checks whether the company is in its first taxable year, applies the standard threshold logic, and then calculates the second installment. It also provides a visual chart showing the four quarterly installments and an estimated balancing amount compared with the projected current year tax.
Core formula used for the second corporate tax installment
For a standard scenario, the working formula is:
Net reference IS = Reference IS before credits – deductible credits
2eme acompte IS = Net reference IS x 25%
There are two important guardrails to keep in mind:
- First taxable year: newly taxed companies may not owe standard installments during their first fiscal cycle.
- Low reference tax: if the net reference tax is below the commonly applied €3,000 threshold, installments are generally not required under the standard rule.
Suppose your company had a reference IS amount of €40,000 and no deductible credits to offset the installment base. The net reference IS remains €40,000. Under the standard quarterly method, each installment would be €10,000. Therefore, the second installment would also be €10,000. After the first two payments, the company would have paid €20,000, or 50% of the reference annual amount used for the schedule.
Why the second installment matters for cash flow
The second installment is more than just a compliance checkpoint. It is also a cash planning event. By June, businesses often have enough year to date information to compare the prior year tax base with the current year forecast. If the current year is expected to be significantly stronger or weaker, finance teams may reassess accruals, working capital needs, and the likely size of the year end balancing payment. That is why many CFOs do not look at the 2eme acompte in isolation. They review it together with:
- profit trends and updated management accounts,
- expected tax credits, carryforwards, or exceptional deductions,
- changes in taxable income caused by one off transactions,
- and the company’s broader treasury strategy.
French IS rates and reference points
When people search for a 2eme acompte IS calculator, they often confuse the tax rate itself with the installment percentage. The tax rate determines the annual corporate tax due on taxable profits. The installment percentage determines what share of the reference tax is prepaid during the year. Since France moved to a standard corporate tax rate of 25%, many companies now work with a simpler rate environment than in earlier transition years.
| Year | Standard French corporate tax rate | Practical note |
|---|---|---|
| 2020 | 28% standard rate in most cases | Transition year, with higher rates still affecting some larger companies on part of profits |
| 2021 | 26.5% standard rate | Step down toward the unified national rate |
| 2022 | 25% | Unified standard rate broadly reached |
| 2023 | 25% | Stable standard rate |
| 2024 | 25% | Common current benchmark for many practical models |
The standard 25% IS rate should not be confused with the possibility of a reduced rate for eligible SMEs on a limited first band of profits. That reduced rate can influence the annual tax amount, which then influences the reference base for installments. In other words, if your annual IS is lower because part of your taxable profits qualifies for a reduced rate, the amount of each installment may be lower as well.
Installment schedule at a glance
Under the classic quarterly approach, the annual reference tax is often spread evenly over four payment dates. That schedule is what makes the second installment easy to estimate once the reference amount is known.
| Installment | Typical due period | Share of reference tax | Cumulative share paid |
|---|---|---|---|
| 1st installment | Mid March | 25% | 25% |
| 2nd installment | Mid June | 25% | 50% |
| 3rd installment | Mid September | 25% | 75% |
| 4th installment | Mid December | 25% | 100% |
How to use the calculator properly
To get a reliable estimate, the most important input is the reference IS before credits. This is the amount your tax department, external accountant, or final tax return identifies as the relevant basis for installment computation. You then enter any deductible credits or reductions you want to net against that amount for planning purposes. If your company is in its first taxable year, select “Yes,” because the standard quarterly installment logic may not apply in the same way.
- Enter the reference corporate tax amount.
- Enter deductible credits or reductions, if any.
- Confirm whether the company is in its first taxable year.
- Leave the installment rate at 25% for the standard rule.
- Optionally add your current year IS forecast to estimate the balancing payment.
- Click the calculate button to generate the second installment amount and the chart.
The chart gives a quick decision making view. The bars show each quarterly installment under the selected method. The line shows cumulative payments over the year. This is especially useful if you are presenting tax cash outflows in a treasury meeting or preparing a monthly finance pack.
Worked examples
Example 1, standard case: Reference IS is €80,000, deductible credits are €0, first year status is “No.” Net reference IS is €80,000. Each quarterly installment is €20,000. Therefore, the second installment is €20,000.
Example 2, credits reduce the base: Reference IS is €30,000 and deductible credits are €4,000. Net reference IS becomes €26,000. The second installment is €6,500.
Example 3, below the threshold: Reference IS is €2,700 and credits are €0. Because the net reference tax is below €3,000, the calculator returns a zero installment under the standard approach.
Example 4, first taxable year: Reference IS is projected at €18,000 but the company is newly taxed. The calculator returns zero under the simplified educational model because standard installments are typically not handled in the same way in the first year.
Common mistakes in 2eme acompte IS calculations
Even experienced operators can make errors when calculating the second installment. The most frequent issues are not mathematical. They are usually data quality or scope problems.
- Using accounting profit instead of tax due: installments are based on tax references, not just income statement profit.
- Ignoring credits or reductions: omitting a deductible amount may overstate the installment.
- Forgetting the €3,000 threshold: some businesses unnecessarily reserve cash for an installment they may not owe under the standard rule.
- Confusing the tax rate with the installment rate: the annual corporate tax rate and the 25% quarterly installment share are different concepts.
- Not updating the annual forecast: the legal installment can be one figure while the expected balancing payment is very different.
Why forecasting still matters even when the formula is simple
The installment formula itself is simple, but tax management is not. A company may have acquisitions, asset sales, transfer pricing adjustments, R&D claims, or special deductions that materially alter the final corporate tax bill. In those cases, a treasury friendly tool should not only compute the second installment but also show the likely year end position. That is why this calculator includes an optional current year estimate. If your forecast tax exceeds the annual amount implied by the installments, the tool highlights a potential balancing payment. If your forecast is lower, you may already be prepaying more than the final amount.
Documentation and audit trail best practices
When your team prepares a 2eme acompte IS calculation, keep a short file or memo containing the following:
- the source of the reference IS amount,
- the fiscal year to which that amount relates,
- the list of credits or reductions applied,
- whether the company qualifies as a first year taxpayer for the period,
- the calculation date and the person who reviewed it,
- and any forecast assumptions used for the year end balance estimate.
This audit trail matters for internal controls. It also makes future installment periods much easier, because your team can compare assumptions across March, June, September, and December instead of starting from scratch every quarter.
Useful external resources
If you want broader context on corporate tax administration, estimated payments, and legal concepts, the following authoritative resources are helpful reading: the IRS corporations guidance, the IRS payments portal and payment guidance, and the Cornell Law School Legal Information Institute overview of corporate tax. While these sources are not a substitute for France specific tax advice, they are useful for understanding how tax authorities frame corporate tax obligations, payment timing, and compliance architecture.
Final takeaway
For most users, the answer to “how do I perform a 2eme acompte IS calcul?” is straightforward: identify the correct net reference tax amount, verify that the company is not in its first taxable year, confirm that the base is at least €3,000, and apply the standard 25% quarterly fraction. The result is the estimated second installment. From there, compare the cumulative installments against your current year forecast to assess whether a significant balancing payment may be due at final settlement.
If you want speed, consistency, and a cleaner finance workflow, use the calculator above as your first pass planning tool. Then validate the inputs against your tax return, internal accounting records, and professional advice where needed. That combination of automation and review is the safest way to manage the second IS installment with confidence.