An importer with 8,000 tonnes of goods a year, at an illustrative 1.8 tonnes of CO2e
per tonne, owes 360 certificates for 2026 and pays €27,063 for
them. That is €3.38 a tonne of product, which is the figure that makes a
finance director stop reading. Two things follow from it, and only one of them is obvious.
The obvious one is that €3.38 a tonne does not stay €3.38 a tonne. The other is that the decision
the number is usually cited to settle — whether to hold a buffer of certificates —
cannot be settled by any of the importer’s own figures, because the answer is the
same whatever they are.
What the phase-in does to the number
The CBAM factor rises from 2.5% in 2026 to 100 per cent in 2034, and the retained free
allocation falls to meet it. Nothing else in the calculation moves.
Year
CBAM factor
Certificates
Cost, €
€ per tonne of product
× 2026
2026
2.5%
360
27,000
3.38
1.0
2027
5.0%
720
54,000
6.75
2.0
2028
10.0%
1,440
108,000
13.50
4.0
2029
22.5%
3,240
243,000
30.38
9.0
2030
48.5%
6,984
523,800
65.47
19.4
2031
61.0%
8,784
658,800
82.35
24.4
2032
73.5%
10,584
793,800
99.22
29.4
2033
86.0%
12,384
928,800
116.10
34.4
2034
100.0%
14,400
1,080,000
135.00
40.0
Same book of imports, same intensity, same €75 certificate price. Only the factor moves. 79.5% of the whole increase happens after 2029.
By 2030 — four years out, not eight — the same book of imports costs
19.4 times what it costs in 2026, and by 2034 40 times. The
phase-in is also strongly back-loaded: 79.5% of the entire increase happens after
2029, which is exactly the interval a three-year plan does not reach.
2027, the year that pays twice
There is a second effect underneath the first, and it lands sooner. From 2027 the quarterly
checkpoint requires the importer to hold 50% of the year-to-date obligation as it accrues —
while the whole of the prior year’s obligation is still to be surrendered in September.
So 2027 carries two obligations at once: €27,063 of lump sum for 2026, and €27,000 built up
through the year for 2027.
Total: €54,063. An importer who budgets the 2026 lump sum and nothing else
has provided for 50.1% of the year.
The factor of 2.00 is not a coincidence of these particular tonnages. The
CBAM factor doubles between 2026 and 2027 — 2.5% to 5.0% — and the checkpoint is fifty
per cent, so half of the 2027 obligation is arithmetically the whole of the 2026 one.
Any importer, any volume, any intensity: the same two.
And it is not a one-year effect either. Every subsequent year carries the previous
year’s whole obligation plus half of its own, with both terms growing.
Year
Surrender for the prior year
In-year build to 50%
Total cash
× prior year
2027
27,000
27,000
54,000
—
2028
54,000
54,000
108,000
2.00
2029
108,000
121,500
229,500
2.12
2030
243,000
261,900
504,900
2.20
2031
523,800
329,400
853,200
1.69
2032
658,800
396,900
1,055,700
1.24
2033
793,800
464,400
1,258,200
1.19
Every year carries the previous year’s whole obligation plus half of its own, and both terms grow through the phase-in.
The cash requirement more than doubles again in 2028 and rises every year to 2033. That is
the shape a treasury calendar has to hold, and it is a different shape from the annual cost
line that most CBAM budgets contain.
The buffer: two questions, and only one of them is yours
The standard advice is to hold a buffer of certificates against the risk that verified
supplier data arrives late or arrives worse than estimated, and to be careful because the
repurchase entitlement is capped. Both halves deserve a number.
Take the cap first, because it is quickly disposed of. The repurchase entitlement is capped
at the certificates the importer was obliged to buy — 360 here. A buffer only reaches that
cap at a 100% buffer. Nothing in the plausible range comes close, so the cap is
not the constraint. The 31 October repurchase deadline is.
Now the cost. A buffer bought in February and repurchased in October is 8 months of carry
on its cost; what it protects against is the penalty on the certificates that would otherwise be
missing. Both are proportional to the buffer.
Buffer
Certificates
Cost, €
Carry for 8 months, €
Protection at risk, €
Break-even P(shortfall)
5%
18
1,350
45
1,755
2.56%
10%
36
2,700
90
3,510
2.56%
15%
54
4,050
135
5,265
2.56%
20%
72
5,400
180
7,020
2.56%
30%
108
8,100
270
10,530
2.56%
Six times the buffer, six times the carry, six times the protection — and the same number in the last column.
Read the last column down. The break-even is identical at every size.
Carry and protection are both linear in the buffer, so the buffer cancels:
break-even P(shortfall) = r × m/12 ÷ k, with r the
cost of capital, m the months carried and k the penalty as a multiple of the
certificate price.
Which separates two questions that are usually asked as one. How big a buffer is a
judgement about your own supplier data and nothing else can answer it. Whether to hold
one is not a judgement at all — it has the same answer at five per cent and at
thirty.
And the penalty figure the regulation will not give you
The obvious objection is that k is unknown: the penalty is indexed and pegged to
the emissions-trading excess penalty, which is why a careful book declines to print a euro
figure. It does not matter, because the answer is insensitive to it across the whole plausible
range.
Penalty, as a multiple of the certificate price
Break-even P(shortfall)
1.0×
3.33%
1.3×
2.56%
2.0×
1.67%
3.0×
1.11%
5.0×
0.67%
The regulation indexes the penalty and the book declines to quote it, correctly. This table does not need the figure.
Between a penalty equal to the certificate price and one at five times it, the break-even
probability moves from 0.67% to 3.33%. An importer relying on unverified supplier
estimates is not below that, and knows it without any further analysis. The buffer decision is
therefore made before the penalty is quantified — which is the only way it could be made
at all, given that the penalty will not be quantified.
One trap in the arithmetic itself
Worth a paragraph because it runs in the direction that gets sanctioned. The surrender
formula is often stated as several terms, one of which is a free-allocation adjustment, applied
alongside the CBAM factor. But the factor and the retained free allocation are complements
— 2.5% against 97.5% in 2026 — so the factor already carries the adjustment. A
workbook built from the formula multiplies by an adjustment below one on top of a factor that
contains it, and arrives at a smaller obligation than the schedule implies.
The implied adjustment in the worked figures here is exactly 1.00, which
is the check to run. Counting it twice under-declares, and under-declaration is the direction
the penalty regime exists to punish.
Three lines for the treasury paper
Budget 2027 at twice the 2026 lump sum, not at the 2026 lump sum, and hold the doubling as
a rule rather than a forecast — it follows from the factor schedule and the fifty per cent
checkpoint. Extend the plan past 2029, where 79% of the increase sits. And decide the buffer on
the break-even rather than on its size: at any penalty between one and five times the price it
sits under 3.3%, and no importer with unverified supplier data is below that.
The workbook behind this article
Every figure above is a live formula in the companion file for
The CBAM Compliance Handbook, which reproduces the chapter’s worked example exactly, runs the phase-in to 2034, builds the 2027 payment calendar and sizes the buffer against the penalty it cannot quote. It is free, and it needs no account and
no email address.
Should corporate debt be fixed or floating?78.1818 per cent of gross debt fixed, and a net floating exposure after cash of -608,000.00 — the proportion, not the instrument.
Does an undrawn revolver count as liquidity?67.4567 per cent of the headroom, and it leaves at a fall in annual revenue of 8.4127 per cent — not the 13.3333 per cent the board deck implies.
Does supply chain finance count as debt?66,049,315 released, and leverage of 2.7622× or 3.1362× depending on which balance the test is asked of — the second is a breach at today's EBITDA.
How do you set a minimum cash balance?Three components, 124,596,281 in total — and the double count that turns a margin of 27,403,719 into an apparent shortfall of -3,988,281.
Is a 2/10 net 60 discount worth taking?An annualised 14.8980 per cent against a revolver at 4.50 per cent — worth 5,471,890 a year, and 0.3132 turns of reported leverage.
At what wealth does a family office pay?A five-person office costs the same $2,442,000 at $100m as at $2bn. Against a tiered multi-family schedule the two curves cross exactly once.
Does the fulcrum move with enterprise value?A worked capital structure at three enterprise values. The break migrates from the first lien to the subordinated notes without a single document changing.
How many companies does a reserve pool defend?Holding pro rata to the Series D costs $14.76m per company. A $40m reserve defends 2.71 of forty — and 61 per cent of the cost is the last round.
How much room a 1.15x downside actually leaves79 basis points of margin. The leverage covenant fails first, five basis points before the coverage covenant the chapter reports on, and 4.6 per cent of EBITDA is the whole cushion.
How the GP catch-up is actually solvedMost write-ups state the catch-up formula then hardcode the answer. Set it as a solve and it moves on its own when the carry rate does.
Six ways to state the same fund's return7.12 per cent, 18.04 per cent, or 1.323 times the public market — one fund, one set of flows. The eleven-point gap is the valuation, and it is not cash.
The IRR at which a closed-ended fund merely tiesA drawdown fund advertising 13.25 per cent ties an evergreen netting 8.64. On committed rather than called capital, 78.7 per cent of the edge vanishes.
The month a remediation trigger has to be armed byMonth 8, on a one-year window and a 14-week hiring lead time. The date is 12W − L/4.33 and holds for any portfolio size — the book only changes the euros.
Two routes to the same NAVFive findings in one quarter-end close, and not one of them was a modelling error. Every one was a control that did not exist.
What a clawback actually collateralises24 million recovers 13.20 net of tax and 7.20 is escrowed. The rule is e ≥ 1 − t, and every euro won on the tax clause lands uncollateralised.
What a co-investment programme actually saves37 basis points, and a 22.8 per cent total-loss rate erases it. At the usual per-deal cap a single failure is 37 per cent of the annual cohort.
What a diligence exercise actually recoversEighteen basis points is only the part that reaches the yield. Three of the four instruments never do, and the exercise is worth thirty-one.
What a follow-on reserve is actually worth0.019 turns under plain dilution, 0.285 under pay-to-play. The optimum is a property of the shareholders’ agreement, not of the portfolio.
What a lease mark-to-market is actually worth5,788,000 becomes 807,365 once the over-market stream, the expiry dates and the cost of re-letting are priced — and nothing at all below a 43.7 per cent renewal rate.
What a minimum payment actually does£81.53 leaves the account and £20.46 reaches the debt. On minimums alone the set clears in 258 months and repays 1.78 times what was borrowed.
What a month of delay costs in an enforcement463,000 euros of present value a month. No single error about enforcement, and no pair of errors, moves the indifference point from 58.7 cents to the 72 on the table.
What a pro rata cheque actually costsDefending costs 1.25 times the initial cheque across two rounds, not more in each — and below a 521 exit the follow-on dollars come back worth less than they cost.
What a subscription line does to the IRR20 per cent becomes 38.41 on the same asset while the multiple falls. Two dollars of interest buys 18.4 points, and the longer the line runs the cheaper each point gets.
What one point of fees actually costsOne point on the annual charge turns 738,846 into 567,961 over forty years — 23 per cent of the pot, and 2.43 of wealth lost per 1 of fee.
When the promote stops clearingCarried interest is not proportional to performance near the hurdle. It is a step function, and $2m of headroom is what stands between a promote and none.
Why a secondaries bid-ask gap has no zoneThe seller’s floor and the buyer’s ceiling are one formula at two rates. At equal required returns the zone is exactly zero — here it is 11.02 points apart.
Why refining a due diligence rubric makes it weakerThree of twelve managers carry a terminal flaw and the average approves all three. Splitting eight domains into sixteen makes it easier to hide, not harder.
If this book helped — or didn’t — a few lines on Amazon are worth more than they look: they are what the next reader goes on. Write a review. The workbook stays free either way.