A 12-month delay on an ERP decision rarely saves money, and on a deadline-driven vendor it usually costs more than $1M. For an SAP customer, a year's slip can push the program past the end of mainstream maintenance and into extended maintenance, which adds about 9% to the maintenance bill. It keeps the old system running and paid for another year. It compresses the remaining timeline, and compression is where overruns start. For Oracle and most tier 2 cloud vendors, which carry no near support deadline, waiting is a different question, about the value of acting now versus later, not a penalty. The cost of waiting depends entirely on which of those two situations you are in.
A year of delay adds cost in four places at once
Waiting does not postpone one cost. It stacks four, and they run at the same time.
The first is the vendor's extended-maintenance premium, which applies only after a support deadline. The second is the price of a third-party support bridge, which a delayed program often needs to cover the gap. The third is the old system itself, which keeps billing maintenance and infrastructure every month it stays live. The fourth is program compression: a shorter runway to a fixed date raises the odds of an overrun, and overruns are the largest number on this list.
| Cost source | When it applies | Rough size of a 12-month slip |
|---|---|---|
| Extended-maintenance premium | After the vendor's support deadline (SAP only, today) | Plus 2 points on the maintenance basis, about 9% of the bill |
| Third-party support bridge | When the program ends after the paid extension window | About half the vendor maintenance bill per year |
| Old system run cost | Every month before go-live | Maintenance at about 22% of license value, plus infrastructure |
| Program compression | When the runway falls below 36 months | 25% to 40% of a compressed migration, per one negotiator's estimate |
Only the first applies to every vendor the same way, and it does not apply to most of them at all. The rest depend on how late the decision already is.
Extended maintenance adds about 9% to the SAP bill each year it covers
SAP standard maintenance runs at about 22% of license value a year. After mainstream maintenance for ECC ends on December 31, 2027, SAP sells extended maintenance at a premium of two percentage points on the maintenance basis, which works out to roughly a 9% increase in the maintenance bill. Redress Compliance, a license negotiation firm, reports quotes of two to four points before negotiation.
A one-year slip that moves a go-live from inside the free window to inside the paid window turns that premium on. The arithmetic, using the two-point premium and before any negotiated relief, looks like this on three maintenance bases.
| Annual SAP maintenance today | Extended-maintenance premium per year |
|---|---|
| $5M | About $450,000 |
| $10M | About $900,000 |
| $20M | About $1.8M |
A mid-size SAP customer sits near the middle of that range. On a $10M maintenance base, the premium alone is about $900,000 for the year the delay adds. Put the extra year of old-system run cost beside it, or a missed incentive window, and the cost of the slip clears $1M before the migration itself has changed at all.
This is the one cost that is specific to a support deadline. It is why waiting is expensive for SAP and neutral for a vendor with no deadline.
A third-party bridge is cheaper than the premium, and still a cost of waiting
When a delayed program will not finish until after the paid extension window closes, extended maintenance from the vendor runs out before go-live. Third-party support fills the gap. It prices at about half the vendor's maintenance bill, according to Redress Compliance, a license negotiation firm; Rimini Street, the largest such provider, claims savings of up to 90%. Both sell the service, so the number to use in a business case is the quote you receive, not either claim.
A bridge is cheaper than the premium, but it is still money the program would not spend if it had started on time. On a $10M maintenance base, a year of third-party support at half the vendor rate is roughly $5M of run cost, against which the delay adds one more year of coverage that a timely program would have retired. Extended maintenance and third-party support are bridges to a dated go-live, never destinations. A delay lengthens the bridge, and a longer bridge costs more and widens the gap between the old system and the new one.
The old system keeps billing every month you keep it
The quietest cost of waiting is the system you already run. Annual maintenance and support after go-live typically runs at 15% to 25% of the implementation cost, and the old platform carries its own maintenance at about 22% of license value plus the infrastructure and staff to keep it live. None of that stops because a decision is deferred.
A delay also tends to lengthen the dual-run period, when the company pays for both the old and new systems at once. That window typically runs 12 to 24 months, and a compressed program that goes live in unplanned waves extends it. Every month of dual-run is a month of two bills.
Consider a manufacturer with $5M of annual SAP ECC maintenance and a $10M migration planned. A 12-month slip adds the $450,000 extended-maintenance premium, keeps the ECC platform live and staffed for another year, and pushes more of the dual-run into the paid window. The old system is not a sunk cost while it runs. It is a live one.
Compression is where the 31% that run long come from
A tier 1 ERP program needs about 36 months from the decision to proceed to a stable go-live. Selection and contracting take six to nine months on their own. Data cleanup starts before the SI arrives and runs past go-live. A delay does not move the support deadline, so it comes straight out of the runway, and a shorter runway forces the program to compress testing or go live in waves it did not plan.
That is where overruns begin. About 31% of ERP implementations run longer than expected, and 12% have significant delays, according to a survey reported by ERP Today. Redress Compliance, a license negotiation firm, puts the cost avoided by bridging to a planned go-live rather than forcing a compressed migration at 25% to 40%. On a $10M migration, that is $2.5M to $4M of avoidable cost, and it dwarfs the maintenance premium.
The 36-month rule shows how a single year compounds. An SAP customer aiming to be off ECC by the end of 2027 needed to decide by the end of 2024. A customer who waits from 2026 to 2027 does not lose one year of slack. It loses the last year it had, and the program now cannot reach a 2027 go-live without compressing, which means buying extended maintenance or a bridge and accepting a higher overrun risk on top. The delay converts a planned program into a late one, and late programs cost more in every category above.
Waiting past a vendor's quarter costs the incentive, not just the time
Vendor incentives follow the vendor's quarter-end and year-end close, not the support date. The discounts that move price, transition credits, first-year subscription relief, and maintenance holidays, cluster in the last weeks of a fiscal quarter, and most of all the fiscal year. SAP's fiscal year ends in December, Oracle's in May, and Microsoft's in June.
A delay that carries a ready decision past one of those windows forfeits the incentive attached to it. The practical sequence is to finish selection and internal approval on your own timeline, then hold the signature for the vendor's quarter-end rather than letting the decision drift past it. A slip of a few months can be the difference between signing inside a vendor's strongest discount window and signing in the quiet first month of the next quarter, when the same terms are not on the table.
This cost does not show up on any lifecycle page, and it applies to every vendor, including the ones with no support deadline at all.
For Oracle and most tier 2 cloud, waiting is a value-timing question
Not every vendor charges for delay. Oracle has committed Premier Support for E-Business Suite 12.2, JD Edwards EnterpriseOne, and PeopleSoft through at least 2037, so an Oracle customer faces no near deadline and no extended-maintenance premium. Most tier 2 cloud vendors, including Infor CloudSuite, IFS Cloud, Epicor Kinetic, Oracle NetSuite, and Acumatica, sell subscriptions with continuous releases, so there is no single cliff to plan around either.
For those customers, waiting is a value-timing question rather than a penalty. The question is whether the new system's capability and cost are worth acting on now versus in a year, not whether a date is closing. The old-system run cost and the lost-incentive cost still apply, so waiting is rarely free. But there is no premium, no forced bridge, and no compression against a fixed date. An Oracle customer who defers a Fusion Cloud decision for a year loses the year's benefit of the new system and nothing on the support side. That is a materially better position than an SAP customer in the same month, and it should be used as the advantage it is, not treated as a reason to stall indefinitely.
Microsoft sits in between. Dynamics GP loses support at the end of 2029, and Dynamics AX is already past end of support, so those customers face a real clock. The path off GP to Business Central is a tier 2 program of 6 to 18 months, which makes a year of delay less punishing than it is for a tier 1 SAP program, but the deadline is firm and the run cost still accrues.
For the full picture of which dates are real and which are not, see our guide to every ERP support deadline in one place.