ATIMA
Written by Justin Goodman, CIC, CRIS, CCIP, CEO and Co-Founder, Total CSR
Published: August 17, 2026 · Last reviewed: August 17, 2026
In plain language: ATIMA means an additional insured added to a policy does not get a separate pot of money to cover their insurance claims. They share the exact same limit that already applies to the primary insured, so one big loss can use up coverage for everyone on the policy.
Technical definition: ATIMA (Additional Insured, Total Insured Merged Amount) is a policy provision found in additional insured endorsements and definitions specifying that the limits of insurance apply collectively to all insureds, including additional insureds, rather than providing separate or stacked limits for each named or additional insured. This legal mechanism is also referenced as ISAOA ATIMA in some standardized contracts.
ATIMA at a Glance
| Attribute | Detail |
|---|---|
| Also known as | Shared limits provision, merged limits endorsement, ISAOA |
| Category | Liability policy endorsement provision |
| Lines of business | Commercial General Liability, Commercial Umbrella, Commercial Excess Liability, Builders Risk Policies, Property Insurance |
| Industries most affected | Construction, real estate development, property management, manufacturing with supply chains, commercial property |
| Related forms or endorsements | CG 20 10, CG 20 37, CG 20 33, CG 20 38, Mortgagee Clause |
| Who bears the risk | Both the primary insured and the additional insured, since they draw from one shared limit |
| Common solution | Require higher underlying limits or a dedicated umbrella/excess layer for the additional insured relationship |
| Also interacts with | Primary and noncontributory wording, per-project aggregate endorsements, vertical exhaustion clauses |
Key Takeaways
- ATIMA is a policy term meaning additional insureds and the primary insured draw from one combined limit of insurance instead of separate, stacked limits.
- ATIMA matters in daily agency work because it directly affects how much money is actually available when both the primary insured and an additional insured face insurance claims from the same occurrence.
- The most common pitfall is assuming that adding a party as an additional insured gives that party its own fresh limit, when in most standard ISO forms it does not—creating unintended consequences for coverage adequacy.
- A quick win for agencies is confirming limit adequacy at the point of underwriting any contract requiring additional insured status, especially on large construction work or lease agreement arrangements with multiple business partners exposed to the same occurrence.
What Is ATIMA in Insurance?
ATIMA is the acronym insurance professionals use to describe how limits of insurance apply when insurance policies have more than one insured, whether that second party is a named insured or an additional insured added by endorsement. Under the ATIMA structure, the insurance carrier's limit of liability is a single, shared bucket. It does not multiply or duplicate for each insured listed on the policy.
This provision exists because carriers price a policy based on one aggregate exposure, not on the sum of every party who might later be added as an additional insured. Without a merged-limit rule, a single CGL policy could theoretically be forced to pay out multiples of its stated limit if five additional insureds each claimed a separate limit from the same covered event. ISO's standard additional insured forms, including CG 20 10 (ongoing operations) and CG 20 37 (completed operations), are built around this shared-limit structure by default.
Consider a general contractor who requires subcontractors to add it as an additional insured with a $1,000,000 per-occurrence limit. A worker on the jobsite is injured during construction work and both the subcontractors and the general contractor face liability insurance claims arising from the same incident. Under ATIMA, the subcontractors' $1,000,000 limit is the ceiling for the entire occurrence, shared between both parties, not $1,000,000 for the subcontractors plus another $1,000,000 for the general contractor as an additional insured.
Agencies who understand ATIMA can proactively flag limit inadequacy before a certificate of insurance goes out, rather than discovering the shortfall during an insurance claim.
How Does ATIMA Work?
- The endorsement is added. A contract requires the primary insured to add another party, such as a client or general contractor, as an additional insured using a form like CG 20 10 or CG 20 33.
- The occurrence happens. A single covered event, such as a jobsite injury or property damage incident, triggers liability exposure for both the primary insured and the additional insured simultaneously.
- The claims are presented. Both parties tender insurance claims to the same policy, seeking defense and indemnity from the identical limit of insurance.
- The limit is applied collectively. The insurance carrier treats the per-occurrence and aggregate limits as one shared amount available to satisfy all insureds' claims from that occurrence, not as separate limits per party.
- The shortfall emerges. If combined damages exceed the shared limit, both the primary insured and the additional insured are exposed to the excess, which is when umbrella or excess coverage becomes critical.
Real Claim Examples Involving ATIMA
Scaffolding collapse exposes both contractor and subcontractors
Subcontractors' improperly secured scaffolding collapsed during construction work, injuring two workers and damaging a general contractor's adjacent equipment. Both the subcontractors and the general contractor, added as an additional insured under a CG 20 10 endorsement, faced bodily injury and property damage insurance claims from the same $1,000,000 CGL policy. Because the policy operated on an ATIMA basis, the combined defense costs and settlements for both parties drew from that single $1,000,000 limit. The insurance payout left the general contractor exposed once the shared limit was exhausted, demonstrating the unintended consequences of inadequate limit planning.
Multi-tenant fire claim with a property manager as additional insured
A commercial property tenant's negligent equipment maintenance caused a fire that damaged multiple units in a strip mall. The property manager, listed as an additional insured on the tenant's CGL policy under the lease agreement, filed an insurance claim for building damage alongside the tenant's own liability claim from injured customers. The shared ATIMA limit meant the property manager's recovery was capped by whatever remaining balance existed after the tenant's own liability payouts, prompting the agency to recommend the property manager also carry its own primary liability coverage for the insured property.
Product liability claim naming a distributor as additional insured
A manufacturer's defective product caused injuries at multiple retail locations, and the distributor, named as an additional insured, was drawn into the same lawsuits as the manufacturer. Since both business partners shared the manufacturer's aggregate limit under ATIMA, the distributor's own risk manager pushed for a separate indemnification agreement and its own excess policy after seeing how quickly the shared aggregate eroded across multiple claimants. This covered peril demonstrated the financial stakes involved when multiple parties share a single limit.
ATIMA vs. Per-Project Aggregate: What Is the Difference?
ATIMA describes how a single limit is shared among all insureds on one policy, while a per-project aggregate endorsement, such as CG 25 03, resets or dedicates a separate aggregate limit to each individual construction project. The two concepts often work together on large jobsites involving subcontractors and material suppliers but solve different problems in project insurance.
| Comparison area | ATIMA | Per-Project Aggregate |
|---|---|---|
| Primary use case | Defines how limits apply across multiple insureds on one policy | Defines how the aggregate limit applies across multiple projects for one primary insured |
| Coverage / concept type | Limit-sharing provision within additional insured and definitions sections | Standalone endorsement modifying the general aggregate structure |
| Typical exclusions | Does not create new coverage, only allocates existing limits | Does not increase the per-occurrence limit, only segregates the aggregate |
| Who is most affected by errors | Additional insureds who assumed they had separate limits | Primary insureds juggling multiple simultaneous projects |
| Common mistakes | Assuming additional insured status equals a fresh limit | Forgetting the per-occurrence limit still applies across all projects |
What Are the Most Common Mistakes With ATIMA?
- Assuming additional insured status creates a separate limit for that party, which leads to underinsured contract requirements and unmet certificate expectations after a large loss—creating unintended consequences for all parties with a financial interest.
- Failing to verify whether a certificate holder's contractual limit requirement accounts for shared ATIMA exposure, which can leave a general contractor underinsured despite technically meeting the standardized contracts' stated limit.
- Not recommending umbrella or excess coverage when multiple additional insureds, including subcontractors and material suppliers, are likely to face simultaneous insurance claims from the same covered event, creating a documentation gap if the shared limit proves inadequate.
- Confusing ATIMA with primary and noncontributory language, which governs the order of payment between insurance policies rather than how limits are shared among insureds on the same policy.
- Overlooking ATIMA implications during contract review, since many standard construction and lease agreements specify a limit amount without addressing whether that limit must be dedicated or can be shared among business partners with ownership interest.
How to Explain ATIMA to a Client
Explaining ATIMA to a personal lines client
ATIMA rarely comes up in personal lines, but if a client asks about adding a landlord or lender as an additional interest on a homeowners or auto policy, explain that any liability limit on the policy is one shared amount. Let them know that adding another party for coverage purposes does not create extra money on top of what the policy already provides—similar to how a mortgagee clause works on property insurance.
Explaining ATIMA to a small business owner
Tell the business owner that when they add a client or general contractor as an additional insured on their policy, that party shares the same limit already purchased, it is not extra coverage stacked on top. Walk them through a real number, like explaining that a $1,000,000 limit is $1,000,000 total for everyone involved in an insurance claim, not $1,000,000 per party. Recommend they consider a higher limit or an umbrella policy if lease agreements or construction contracts require significant additional insured obligations, especially when dealing with commercial property or investment property exposures.
Explaining ATIMA to a CFO or risk manager
Frame ATIMA as a limit adequacy issue tied directly to contractual risk transfer strategy. Explain that when the organization is added as an additional insured on a vendor's or subcontractors' insurance policies, the organization is competing for the same dollar-for-dollar limit as the primary insured in the event of a shared occurrence. Recommend a documented review of underlying limits against worst-case simultaneous claim scenarios, and discuss whether a dedicated excess layer or higher contractual limit requirement better protects the organization's balance sheet and financial stakes in the work in progress.
Frequently Asked Questions About ATIMA
Does ATIMA mean additional insureds get their own separate limit?
No. ATIMA specifically means the opposite: additional insureds share the same limit of insurance as the primary insured rather than receiving a separate or stacked limit. This is the default structure under most standard ISO additional insured endorsements and affects the insurance benefits available to all parties.
Can an agency negotiate around ATIMA to get a dedicated limit for an additional insured?
Standard ISO forms do not offer a dedicated limit option for additional insureds, since the shared-limit structure is built into the policy's definitions and conditions. Agencies address the underlying exposure instead by recommending higher overall limits, umbrella coverage, or a separate policy for the additional insured party rather than trying to carve out a distinct limit—protecting the financial interest of all parties involved.
How does ATIMA affect certificate of insurance requirements in contracts?
Contracts often specify a required limit amount, such as $1,000,000 per occurrence, without addressing whether that limit is shared among all additional insureds under ATIMA. Agencies reviewing certificates should confirm whether the stated limit realistically covers simultaneous insurance claims from both the primary insured and additional insured arising from the same covered event, particularly in lease agreements and construction work scenarios.
Is ATIMA the same thing as primary and noncontributory coverage?
No. ATIMA governs how one policy's limit is shared among multiple insureds, while primary and noncontributory language governs which policy pays first when more than one policy could respond to the same insurance claim. They are separate provisions that often appear together in standardized contracts but address different questions about insurance payout priority.
Why would a general contractor want higher limits if it is already an additional insured?
Because ATIMA means the general contractor is drawing from the same limit as the subcontractors, any insurance claims against the subcontractors reduce what remains available for the general contractor from that same occurrence. Higher underlying limits or a dedicated excess policy give the general contractor its own cushion beyond the shared amount, protecting their ownership interest and financial stakes in the construction work.
Does ATIMA apply to umbrella and excess policies too?
Yes, most commercial umbrella and excess insurance policies incorporate the same shared-limit concept for additional insureds that the underlying CGL policy uses. This means limit adequacy analysis should extend through the entire tower of coverage, not just the primary layer, to ensure adequate insurance benefits for all parties.
Related Insurance Terms
- Additional Insured Endorsement: a policy modification that extends liability coverage to a party beyond the primary insured, most commonly used in construction contracts, lease agreements, and vendor agreements, and the document where ATIMA provisions typically live.
- Blanket Additional Insured: an endorsement that automatically adds any party the primary insured is contractually required to add as an additional insured, without needing a separate endorsement for each one, still subject to the same ATIMA shared-limit rule.
- Primary and Noncontributory: a policy condition determining that one insured's policy pays first and does not seek contribution from another insured's policy, a separate concept from ATIMA that governs order of payment rather than limit sharing among business partners.
- Vertical Exhaustion: a claims-handling approach requiring each layer of insurance to be fully exhausted before the next layer responds, relevant when ATIMA causes a shared primary limit to erode faster than expected.
- Waiver of Subrogation: a provision preventing an insurer from pursuing recovery against another party after paying an insurance claim, often required alongside additional insured status in the same construction contracts where ATIMA limit sharing applies.
- Per-Project Aggregate Endorsement: a form that dedicates a separate aggregate limit to each construction project for a single primary insured, addressing a different limit-adequacy problem than the multi-insured sharing that ATIMA describes in project insurance.
- Mortgagee Clause: a property insurance provision protecting a lender's financial interest in insured property, similar in concept to additional insured status but typically found in property insurance and builders risk policies rather than liability coverage.
- ISAOA: stands for "Its Successors and/or Assigns," often appearing as ISAOA ATIMA in standardized contracts to indicate that the shared limit provision applies to all parties with an ownership interest or effective interest in the covered property or operations.
Sources and References
- International Risk Management Institute (IRMI). Additional Insured - Total Insured Merged Amount (ATIMA).
About the Author
Justin Goodman, CIC, CCIP, CISC, CLCS, CRIS, PCIA, QCLS, MFHR
CEO and Co-Founder, Total CSR, Inc.
Justin Goodman is a third-generation insurance broker with over two decades in agency operations. He has trained more than 50,000 CSRs, account managers, and producers in commercial and personal lines coverage, from workers' compensation to construction risk. He was named 2024 Insurance Journal Agent of the Year and one of the nation's top five construction insurance experts by Risk & Insurance. He is the author of Retain, which applies cognitive science research on memory and knowledge transfer to insurance training, and speaks nationally on how agencies build durable technical expertise in their teams.