Every spring, the tax return displays pre-filled boxes that most taxpayers validate without checking. Box 2BH is one of those lines that goes unnoticed, while an error in its amount can skew the calculation of the deductible CSG and, consequently, increase the tax owed. Understanding what it contains and knowing how to verify it takes a few minutes but can prevent an unpleasant tax correction.
What box 2BH triggers in the calculation of your tax
Box 2BH groups income from movable capital that has already been subject to social contributions at source. Specifically, when your bank or a financial intermediary withholds social contributions before paying you interest or dividends, the corresponding amount must appear in 2BH.
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Why does this box matter so much? Because it serves as the basis for the automatic calculation of the d deductible CSG when you check box 2OP (option for the progressive scale). If 2BH is empty or underestimated while you opt for the scale, you lose a portion of the deductible CSG from your global income. The administration will not spontaneously correct it in your favor.
On the other hand, if you stick to the flat tax (30% flat tax), box 2BH has no direct impact on your tax, since the CSG is then not deductible. Knowing how to fill out box 2BH on taxes thus becomes particularly useful as soon as you consider the scale option.
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Income to include and income to exclude from box 2BH
Have you already noticed that your pre-filled return shows an amount in 2BH without detailed explanation? This figure comes from the IFUs (unique tax forms) sent by your banks and platforms. The problem arises when multiple intermediaries are involved or when an IFU arrives late.
Income that must appear in 2BH
- Interest from term accounts, taxed PELs, and classic bank savings accounts, as long as the social contributions have been withheld at source by the financial institution
- Dividends from French stocks paid by your broker or bank, which has already deducted the social contributions before payment
- Interest from crowdfunding platforms (crowdlending): add up all the 2BH boxes from each received IFU, even in the case of multiple intermediaries, to find the correct total
Income not to include in 2BH
The practical brochure IR 2025 from the DGFiP clarified a point that traps many filers. Foreign movable capital income benefiting from a conventional tax credit is excluded from box 2BH, even if they have been subject to social contributions in France. This income must be reported in box 2DC or 2TS with their specific tax credits.
If you hold American or European stocks paying dividends, check the IFU to ensure that these amounts are not mixed with your French income in line 2BH. A confusion at this stage skews both the deductible CSG and the foreign tax credit.
Concrete method to verify and correct box 2BH
Rather than validating the pre-filled return with your eyes closed, take five minutes to do a cross-check. Here’s how to proceed, from the simplest to the most technical.
Start by gathering all your IFUs for the year. Each bank, insurer, or crowdfunding platform sends you one, usually between March and April. Locate line 2BH on each document.
Add up all the 2BH lines from your various IFUs. Compare this total to the pre-filled amount on your online return. If they match, you can move on. If the pre-filled amount is lower, it’s often because an IFU was sent late to the administration.
In this case, manually correct box 2BH in your online return. Form 2042 allows you to modify the pre-filled amounts: click on the box, enter the correct total, and keep your IFUs as proof in case of an audit.
Scale option or flat tax: the direct impact on box 2BH
The choice between the flat tax and the progressive scale radically changes the utility of box 2BH. With the flat tax, the CSG withheld is not deductible from your global income. Box 2BH remains present on your return, but it does not change your final taxation.
By checking box 2OP (option for the progressive scale), you activate a different mechanism. The portion of deductible CSG (set at 6.8% of the concerned income) is calculated automatically from the amount entered in 2BH. The more accurate and complete this amount is, the more accurate the deduction will be.
For taxpayers whose marginal tax rate remains moderate, the scale option combined with the 40% allowance on dividends and the deduction of the CSG can prove more advantageous than the flat tax. But this calculation only works if box 2BH reflects the reality of your income that has already been subject to social contributions.
Three common mistakes regarding box 2BH and how to avoid them
- Reporting life insurance income over 8 years in 2BH instead of 2DH: life insurance products benefiting from the annual allowance have their own boxes (2DH, 2CH). Mixing them with 2BH creates a duplicate in the calculation of social contributions
- Forgetting interest from participatory platforms: each platform issues its own IFU, and some do not automatically transmit the data to the administration. An unaccounted IFU means an incomplete 2BH amount
- Including foreign income with a tax credit: as specified by the practical brochure 2025, this income does not belong in 2BH and must be reported separately with the corresponding tax credit
Box 2BH requires neither accounting expertise nor specialized software. Gathering your IFUs, adding up the 2BH lines, and comparing to the pre-filled amount is enough to secure this part of the return. The real trap is not the complexity of the form; it’s the blind trust in the pre-filled amounts, which sometimes remain incomplete.