On 21 September the EU quietly gave you a choice you did not ask for...

The revised ESRS are in the Official Journal. They cut mandatory datapoints from 783 to 292. They become law on 10 November and mandatory for financial years starting in 2027. So far, so predictable.

Then comes the sentence that will cost some reporting teams their Christmas. For a financial year starting in 2026, you may apply the old standards, the old standards with eight new reliefs, or the new standards in full. Your choice. And you must write in the report which one you chose.

That is not flexibility. That is a decision with an audit trail.

Pick the old ESRS and you publish a 2026 report that looks nothing like your 2027 one, on datapoints the law has already deleted. Pick the full switch and you re-run materiality in Q4 with no implementation guidance and an assurance provider who has never signed off on the new text. Pick the middle road and you need to know exactly what those eight reliefs are, because the regulation names them by paragraph number.

Here is what each route costs, who should take it, and the one-page rule we use with clients. It takes six minutes. The decision it prepares you for should be taken before the end of October.

What the regulation actually says

Commission Delegated Regulation (EU) 2026/1563 replaces Annexes I and II of the 2023 ESRS regulation with the revised standards. Article 2 is the part that matters for you this year. For financial years starting between 1 January and 31 December 2026, an undertaking in scope of the CSRD may apply either of the following:

• the existing ESRS (Delegated Regulation 2023/2772 as last amended by the 2025 "quick fix", Delegated Regulation 2025/1416), or the revised ESRS in full; or
• the existing ESRS with eight named reliefs taken from the revised text.

Whichever you pick, Article 2(2) requires you to "clearly state" in the sustainability statement which version you applied. Your auditor will look for that sentence. So will anyone comparing your 2026 statement with your 2025 one.

The eight reliefs are listed by paragraph of the revised ESRS 1:

1. Paragraph 27: a top-down approach to the double materiality assessment.
2. Paragraphs 32 and 33: "undue cost or effort" and a value-chain limitation inside the materiality assessment.
3. Paragraphs 74 and 75: new acquisitions may be recognised from the start of the following year; disposals are reflected from the beginning of the year in which they occur.
4. Paragraph 90: activities that are not significant drivers of a material impact, risk or opportunity may be left out of the metric.
5. Paragraph 91: metrics may be reported for an objectively defined part of the value chain rather than all of it.
6. Paragraph 92: joint operations without operational control may be excluded from environmental metrics, except under ESRS E1.
7. Paragraph 106: EU Taxonomy disclosures may be presented in a separate appendix to the sustainability statement.
8. Paragraph 110: an executive summary may open the statement.

Read that list again with a controller's eye. Five of the eight are about scope and boundary: what you count, which entities, which part of the value chain. Two are about layout. One changes how you run the materiality assessment itself. None of them reduce the number of datapoints you owe under the old standards. That is the trap in the middle option, and we will come back to it.

Route one: stay on the existing ESRS

What it costs

Least effort in Q4 2026. Your materiality assessment, your datapoint inventory, your systems mapping and your assurance file all carry over from the 2025 cycle. The quick fix of 2025 already let you keep 2024-level reporting for 2025 and 2026, so your third report looks like your second.

The bill comes in 2027. You will then move to the revised standards with no rehearsal, on a year when your assurance provider is also learning them, and your 2026 figures will sit on a datapoint set that has been deleted. Anyone comparing 2026 with 2027 will find that roughly six in ten mandatory datapoints in the old statement have no counterpart in the new one. Restating for comparability is not required, but investors will ask.

Who should take it

Companies that will leave CSRD scope after Omnibus I (the threshold is now more than 1,000 employees and more than 450 million euro net turnover) and are only reporting for 2026 because their Member State has not yet used the option to exempt them. If 2026 is your last statement, do not invest in a new framework for it.

Companies with a financial year that started early in 2026 and closes before the standards are even in force. If your year-end is 30 September, the revised ESRS enter into force six weeks after your books close. Switching is legal, since Article 2 refers to the financial year and not the reporting date, but the practical case is weak.

Route two: existing ESRS plus the eight reliefs

What it costs

This is the option most boards will find attractive and most reporting teams should distrust. It reads as "old standards, less work". In practice it is old standards, same datapoints, with a set of boundary and scope changes bolted on.

Look at what you gain. The top-down materiality approach and the undue-cost limitation genuinely shorten the assessment, and if you were planning to refresh your materiality assessment anyway, they let you do it the new way. The acquisition and disposal rule saves a scramble if you closed a deal in 2026. The three metric-boundary reliefs (non-significant activities, partial value chain, joint operations) take real datapoints off the table for groups with complex structures. The Taxonomy appendix and executive summary are presentation choices that cost nothing.

Now look at what you do not gain. You still owe every mandatory datapoint of the 2023 standards that is material to you. The 783-to-292 reduction does not apply. You also create a hybrid statement that exists for one year only: a 2026 report on old datapoints with new boundaries, followed by a 2027 report on new datapoints with the same new boundaries. Your assurance provider has to test the reliefs against the revised text while auditing the rest against the old one. That is two rulebooks in one engagement, and it will be priced accordingly.

One more point to settle with your auditor early. Article 2 lists the reliefs as a set. Most advisers read it as allowing you to apply some and not others. Agree the reading, document it, and put the list of reliefs you used in the same sentence as the version statement.

Who should take it

Groups that made an acquisition or disposal in 2026 and want the timing rule. Groups with joint operations or a long value chain where the boundary reliefs remove material collection effort. Companies whose materiality assessment is due for a refresh in any case. If none of those describe you, the middle road gives you two presentation options and a more complicated audit.

Route three: apply the revised ESRS in full

What it costs

Most work in Q4 2026, least work in 2027. You re-run the double materiality assessment under the new ESRS 1, re-map the disclosure inventory to the 292 mandatory datapoints, redesign the value-chain data request against the new Voluntary Standard's Annex II cap, and brief the assurance provider on a text they have not yet audited. You do this without implementation guidance, because EFRAG has not updated its 2024 guidance documents and its Q&A platform has been on hold since the end of 2025. Your supporting material is the legal text, the Basis for Conclusions, and EFRAG's draft list of datapoints, which is still in consultation until 23 October.

The reward is that your 2026 statement and your 2027 statement are the same document a year apart. You learn the new standards on a voluntary year, when a mistake is a footnote rather than a finding. Your first mandatory revised-ESRS report is your second one. And you stop collecting data for datapoints the law has already deleted, which for most groups means the data collection round starting this autumn is 60 percent shorter.

There is one hidden cost. The phase-in options in the revised standards come with a disclosure floor. Where you omit information under a phase-in, ESRS 2 BP-2 still requires you to say whether the topic was assessed as material and, if so, to give at least the topic identification, how your strategy takes account of it, your targets, policies, actions and relevant metrics. Phase-in is not silence. Teams that expect the new standards to let them skip a topic they have already called material will be disappointed.

Who should take it

Companies that are certain to remain in scope in 2027 and whose financial year is the calendar year. Your 2026 data collection is already running; redirecting it now is cheaper than finishing the old process and starting again in January. Companies whose materiality assessment is more than two years old and needs redoing anyway. Companies with a sustainability team that is stable enough to absorb one hard quarter in exchange for two easier years.

Who should pick which: the one-page rule

Your situation, your take and why:

• You leave CSRD scope after 2026, or your Member State is expected to exempt you - Route one
  
  • Do not build a new framework for a final report.
• Non-calendar financial year that closed or closes before 10 November 2026 - Route one, or route two for the presentation reliefs only
  
  • Switching after the books close is legal but pointless.
• Calendar year, staying in scope, materiality assessment less than two years old, no 2026 M&A - Route two with the boundary reliefs, or route three if the team has capacity
  
  • Boundary reliefs give most of the effort saving; full switch gives comparability.
• Calendar year, staying in scope, materiality assessment due for a refresh - Route three
  
  • You are doing the hard part anyway; do it once, under the standard you will keep.
• Acquisition or disposal closed in 2026 - Route two at minimum
  
  • The paragraph 74 and 75 timing rule alone is worth the hybrid.
• Large group with joint operations and a long value chain - Route three
  
  • Paragraphs 90 to 92 plus the 292-datapoint set compound; you save on both boundary and volume.

The rule underneath the table is simple. If 2027 is certain and the calendar year is your year, the question is not whether to switch but whether you can afford to do it twice. Most cannot.

What to do in October

1. Confirm your 2027 scope position in writing. Employees over 1,000 and net turnover over 450 million euro, both tests, on the Omnibus I definitions. If you are out, stop reading and take route one.
2. Put the three routes and the table above in front of the audit committee before the end of October, with a recommendation. The decision must be made before the year-end data collection closes, not at drafting time in February.
3. Ask your assurance provider two questions in one email: which route they are staffed to assure for 2026, and how they read the "pick and choose" question on the eight reliefs. Get the answer in writing.
4. If you lean to route three, download EFRAG's 2026 draft list of datapoints now and map your current inventory to it. The survey on that list closes on 23 October; if you find an error, this is the only month it can be fixed before the 2027 cycle.
5. Redesign your supplier questionnaire against Annex II of the Voluntary Standard. The value-chain cap applies from financial years starting in 2027, but the requests you send this autumn will be answered in that period, and suppliers with fewer than 1,000 employees will know they can refuse anything above the cap.
6. Draft the version sentence now. "This sustainability statement has been prepared in accordance with [version], as permitted by Article 2 of Delegated Regulation (EU) 2026/1563, applying the reliefs in [paragraphs]." One line, agreed with the auditor, before anyone writes a chapter.

The revised ESRS were sold as the end of complexity. For 2027 they may be. For 2026 they have handed you a choice with three answers, one deadline and a disclosure obligation attached to whichever answer you give. Make it in October, on paper, with your auditor's name on the same page.

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