Deposit Premiums and Core Deposit Intangible

Introduction

The deposit franchise is the most valuable asset in most bank acquisitions, and two metrics capture its value from different angles. The deposit premium measures the total premium paid for the deposit base (the excess of purchase price over fair value of net tangible assets, expressed as a percentage of deposits acquired). The core deposit intangible (CDI) is a separately identified intangible asset under purchase accounting (ASC 805), representing the present value of the cost advantage from funding with below-market-rate deposits rather than wholesale alternatives. Both concepts are central to bank M&A pricing, but they measure different things and serve different purposes. For FIG bankers, understanding how deposit premiums are negotiated and how CDI is valued, amortized, and treated under regulatory capital rules is essential for every bank deal analysis.

The deposit premium is calculated as: (purchase price minus fair value of net tangible assets) divided by total deposits acquired. If a bank is purchased for $200 million and its fair value net tangible assets are $150 million, the premium is $50 million divided by, say, $1.5 billion in deposits, equaling 3.3%.

Deposit premiums in whole-bank deals have historically averaged 6-10%, though they vary significantly with interest rates, deposit composition, and market conditions. Pre-financial-crisis premiums averaged approximately 20%. Post-crisis, they compressed to single digits. In 2024, premiums fell toward financial crisis levels as net interest margin pressure and rate uncertainty depressed franchise valuations. In 2025 branch-specific transactions (which isolate the deposit franchise from the rest of the bank), reported premiums ranged from 4.6% to 7.5%.

Core Deposit Intangible (CDI)

The core deposit intangible is a separately identified intangible asset recorded under ASC 805 purchase accounting. It represents the economic value of a bank's core deposit relationships: the present value of the cost savings from funding with low-cost deposits (checking accounts, savings accounts, money market accounts) rather than market-rate alternatives (brokered CDs, FHLB advances, wholesale funding). CDI is valued using a discounted cash flow model (the "cost savings approach") that projects the spread between the all-in cost of core deposits (interest expense plus net servicing cost) and the cost of alternative wholesale funding, discounted at a risk-adjusted rate over the expected life of the deposit relationships. CDI is a finite-lived intangible: it is amortized over its useful life (typically 10 years) and is tax-deductible, unlike goodwill. Both CDI and goodwill are deducted from CET1 capital under Basel III.

The distinction between the deposit premium and CDI matters. The deposit premium is a deal-level metric that captures the total value attributed to the deposit franchise (including goodwill). CDI is an accounting concept that captures only the identifiable intangible value of below-market funding. A bank paying a 6% deposit premium might record CDI of 2.5% of core deposits; the remaining premium flows into goodwill or other fair value adjustments.

The standard approach for CDI valuation is the cost savings method, a DCF analysis that quantifies the economic benefit of retaining low-cost deposits versus raising equivalent funding at market rates.

Each deposit type should be valued separately because the economics differ significantly. Non-interest-bearing demand deposits (DDA) generate the highest CDI value: they cost the bank nothing in interest, and the spread versus wholesale funding is the widest. Interest-bearing checking and savings accounts generate moderate CDI. Money market accounts, which tend to reprice more aggressively, generate lower CDI. Certificates of deposit typically generate zero CDI because they are already priced at or near market rates and are not relationship-driven.

CDI values have been remarkably stable as a percentage of core deposits, even as overall deal premiums have fluctuated.

The stability of CDI values (within a narrow 2.5-2.7% band) reflects that CDI captures the structural funding advantage of core deposits, which is relatively consistent across rate environments. The absolute dollar value changes (as the spread widens or narrows), but as a percentage of the deposit base, CDI remains anchored. By contrast, deposit premiums and overall P/TBV multiples can swing significantly based on market sentiment, earnings expectations, and competitive dynamics.

CDI is a finite-lived intangible asset, which gives it fundamentally different accounting treatment than goodwill.

Amortization: CDI is systematically amortized over its estimated useful life. The OCC guidance recommends a useful life not exceeding 10 years, and the vast majority of banks adopt a 10-year term. Approximately 66% of transactions use accelerated amortization methods (sum-of-years-digits or similar), reflecting the economic reality that deposit attrition is faster in early years as some acquired customers leave during integration. Approximately 34% use straight-line amortization.

Earnings impact: CDI amortization flows through noninterest expense (or as a separate line item) and reduces GAAP earnings. FIG analysts add back CDI amortization when calculating ROTCE and "adjusted" or "operating" earnings, treating it as a non-cash purchase accounting charge rather than a true operating expense. The add-back is standard across the industry and well understood by investors.

Tax treatment: CDI is tax-deductible, creating a deferred tax benefit that partially offsets the day-one CET1 deduction. Goodwill, by contrast, is not tax-deductible (for deals structured as stock acquisitions, which is the vast majority of bank M&A). This tax advantage makes CDI the more capital-efficient intangible: every dollar recorded as CDI rather than goodwill generates a tax shield over its amortization life.

In deal negotiations, the deposit premium reflects the acquirer's assessment of deposit franchise quality across several dimensions.

Deposit composition: Higher proportions of non-interest-bearing DDA and low-cost savings deposits command higher premiums. A bank funded 40% by DDA carries a fundamentally different value than one funded 40% by CDs. The SouthState-Independent deal valued Independent's Texas franchise partly for its favorable deposit mix.

Cost of deposits: The lower the target's cost of funds relative to peers and relative to wholesale alternatives, the more valuable the franchise. Deposit beta (how much deposits reprice for each unit of rate change) is the key metric: low-beta deposits are more valuable because they maintain their cost advantage through rate cycles.

Geographic attractiveness: Deposits in high-growth markets (Texas, Florida, Southeast) command premiums over deposits in declining or saturated markets. The regional bank consolidation wave is partly driven by acquirers seeking geographic repositioning through deposit franchise acquisition.

Customer relationship depth: Deposits tied to broader banking relationships (operating accounts for businesses, households with multiple products) are stickier and more valuable than rate-sensitive deposits from customers who will leave at the first better offer.

Deposit premiums and CDI together capture the most distinctive element of bank franchise value. In a sector where balance sheet quality and funding cost determine profitability, the deposit franchise is the core asset being acquired in most bank deals. Understanding how to value it, account for it, and analyze its regulatory capital impact is foundational to FIG M&A advisory.