A pre-filled amount in box 2BH that does not match the IFU received from the bank leads to an incorrect calculation of the deductible CSG. We see this case every year during income tax declarations, often among taxpayers who hold a securities account or a life insurance policy for more than eight years.
Box 2BH of the 2042 declaration presents a specific difficulty: it only concerns income from movable capital already subject to the progressive scale by the paying institution, and not all financial income. Understanding how it works helps avoid mistakes that impact the final tax.
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Link between IFU, box 2BH, and deductible CSG on the 2042 declaration
Box 2BH does not exist in isolation. It directly depends on what the financial institution has transmitted via the unique tax form (IFU). When the bank or insurer has already applied a progressive scale tax on certain movable capital income, the corresponding amount is pre-filled in 2BH.
This pre-filling has a very specific function: to allow the calculation of the deductible CSG associated with this income. Manually modifying this box without checking its consistency with the IFU can lead to a double counting of the deductible CSG or a simple omission.
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For the 2026 income, the IFUs now distinguish between products subject to the flat tax (PFU) that do not qualify for deductible CSG (box BS of the IFU) and those that may open this right in case of scale option (box DQ of the IFU). It is this distinction that feeds into the reporting in 2BH on the 2042.
Before making any changes, we compare line by line the IFU received with the amounts displayed on the pre-filled declaration. A complete guide allows you to learn everything about box 2BH taxes and the pitfalls related to this reporting.
Box 2OP and progressive scale: when box 2BH changes scope
Box 2OP is the one that triggers the global option for the progressive scale, replacing the PFU (flat tax). Checking 2OP changes the tax treatment of all movable capital income, including dividends. And this is where box 2BH takes on another dimension.
Without 2OP checked, the deductible CSG linked to 2BH remains limited to income already taxed at the scale by the paying institution. With 2OP, the scope widens: more income becomes eligible for this partial CSG deduction.
Check the real benefit of the scale option
2OP is often checked reflexively, thinking that the progressive scale is always more advantageous when one is lightly taxed. The reality depends on the total amount of the household’s income and the nature of the financial products held.
- Dividends benefit from a 40% allowance before applying the scale, which can make the option interesting for households in the lower brackets.
- Interest from securities accounts or bonds do not benefit from any allowance: the scale may then cost more than the PFU.
- Life insurance products over eight years have their own regime with a specific allowance, and their treatment in 2BH depends on the contract and the date of the payments.
The choice between PFU or scale is global for a given year. One cannot apply the scale to dividends and the PFU to interest. Any error on 2OP automatically impacts 2BH and the amount of deductible CSG retained.
Claim and right to revert on the PFU or scale choice
An unknown asymmetry exists between fiscal years. For the 2025 income declared in 2026, the scale option via 2OP is irrevocable once the declaration is validated. However, for the 2026 income, it will be possible to revert this choice until December 31, 2029, as part of a contentious claim, according to analyses by Hagnère Patrimoine.
This three-year window changes the game. If it is discovered afterward that the PFU would have been more favorable (or vice versa), a claim allows for correction for the 2026 income. Box 2BH will then be recalculated accordingly by the administration.
Concrete steps to follow
The claim is made from the personal space on impots.gouv.fr, under the “Claims” section. The relevant IFU is attached, and the desired option change (switching to the scale or returning to the PFU) is specified. The recalculation of the deductible CSG and box 2BH is carried out by the managing service.
Frequent errors on box 2BH and life insurance income
Withdrawals from life insurance contracts over eight years generate products that can appear in 2BH if the insurer has applied the scale. The confusion arises because these same products sometimes also appear in box 2DH or 2CH, depending on the nature of the contract and the date of the premiums paid.
The same withdrawal must not appear twice in the declaration. If the amount is pre-filled in 2BH and 2DH is filled out manually without verification, there is a risk of partial double taxation or artificially inflated deductible CSG.
- Always compare the insurer’s statement with the pre-filled boxes 2BH, 2DH, and 2CH.
- Do not modify 2BH if the amount corresponds to the IFU, even if you do not understand why it is there.
- In case of doubt, contact the insurer to obtain details of the tax treatment applied to the withdrawal.
Responses vary on this point depending on the insurers: some clearly detail the attachment to each box, while others provide a less readable synthetic IFU. The IFU remains the reference document, not the contract situation statement.
Box 2BH is not a line to be filled out randomly or ignored because it is pre-filled. It reflects a real tax choice, linked to the progressive scale and the deductible CSG. Checking its consistency with the IFU, understanding the impact of box 2OP, and keeping in mind the possibility of a claim for the 2026 income are three reflexes that avoid most post-corrections.