An internal funding rate is the rate a bank assigns to a transaction or business activity for internal funding and liquidity allocation.
An internal funding rate is the rate a bank assigns to a transaction, product, or business activity to represent its internal funding cost or benefit. It is commonly an output of a funds transfer pricing framework and is used for product pricing, profitability measurement, and balance-sheet risk allocation.
Funds transfer pricing is the overall framework. The internal funding rate is a numerical rate produced by that framework for a defined exposure.
For an asset:
For a funding source:
These simplified margins are intermediate management measures, not consolidated profit.
A policy may construct an internal funding rate as:
Other approved adjustments can include contingent liquidity, optionality, currency, legal-entity, reserve, secured-funding, or behavioral components. The formula is illustrative, not universal.
Assume a bank prices a five-year loan using:
The assigned internal funding rate is:
If the customer rate is 6.75%, the simplified margin over internal funding is:
For a $5 million constant balance over one year, that margin equals:
The $107,500 is not net income. The bank still needs to consider expected credit loss, servicing, origination expense, allocated capital, taxes, and other costs. If a manager mistakenly used only the 4.10% base curve, the apparent margin would be overstated by $25,000 because 0.50% of approved funding and option adjustments would be omitted.
| Rate or measure | Source | Main use |
|---|---|---|
| Internal funding rate | Treasury or FTP policy | Product pricing and internal profitability |
| Marginal cost of funds | Incremental external funding opportunity | Pricing new balance-sheet growth |
| Average cost of funds | Existing funding expense divided by defined balances | Historical performance analysis |
| Customer rate | Loan, deposit, or security contract | Customer cash-flow calculation |
| Market benchmark | Published or traded reference | Curve input, comparison, or reset formula |
| Hurdle rate | Management return requirement | Decision threshold after specified costs and capital |
An internal rate can use market and actual funding data without being identical to either.
Suppose a bank funds both a three-month floating loan and a ten-year fixed loan. Charging both products the same average funding rate ignores:
The short product can be overcharged while the long product is undercharged. That distortion can reward duration and liquidity risk that the business line does not appear to bear.
The appropriate internal rate may combine different horizons. For example, a five-year asset that resets every three months can use:
Contractual maturity alone can also be misleading. Amortization, prepayment, early withdrawal, deposit decay, drawdowns, and extension behavior can change expected cash flows.
Deposits can receive an internal credit because they provide funding value. The rate should reflect the deposit’s characteristics rather than automatically crediting all balances as long-term stable funds.
Relevant factors include:
A non-maturity deposit can have a modeled behavioral life, but it still remains withdrawable under its contract. Model stability is not a legal maturity promise.
The rate can reflect funding through expected life, repricing frequency, amortization, prepayment, and liquidity needs. Credit risk should usually be identified separately.
A line of credit can receive a contingent-liquidity charge based on modeled stress drawdown even when the current funded balance is zero.
The rate can differ for secured and unsecured portions, reflect market haircuts, and update more frequently. A position held longer than intended may require reassessment.
Collateral rights, margin flows, downgrade triggers, and stressed outflows can affect internal funding treatment even when the derivative’s fair value is near zero.
Banks can use more than one internal rate view:
Mixing these views can make profitability changes hard to interpret. Reports should label which rate is used and whether changes reflect customer pricing, market rates, volumes, behavior, or methodology.
An internal funding-rate process should document:
The rate should be reproducible from approved data. A manager should not be able to improve reported profitability by selecting an undocumented funding curve.
An internal funding rate is an allocation estimate, not a guaranteed external borrowing cost. Results can be sensitive to curves, liquidity assumptions, customer behavior, options, and management judgment. An inaccurate rate can distort product pricing, business-line incentives, and risk-adjusted profitability even when consolidated cash flows are unchanged.
This page provides general financial education, not individualized banking, treasury, product-pricing, regulatory, accounting, or model-risk advice.
The exact method and applicable supervisory requirements depend on the institution and jurisdiction.