SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Sep. 30, 2014
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements include the accounts of the Fund and its wholly owned subsidiary LEAF Receivables Funding 4, LLC. The consolidated financial statements also include LEAF Funds Joint Venture 2, LLC (“LEAF Funds JV2”) and its subsidiaries LEAF Commercial Finance Fund, LLC (“LCFF”) and LEAF Receivables Funding 6, LLC, as well as LEAF Funding, LLC (“LEAF Funds JV1”) and its wholly owned subsidiaries LEAF Capital Funding III, LLC and LEAF Receivables Funding II, LLC. The Fund maintains a 98%, and 96% ownership interest in LEAF Funds JV2 and LEAF Funds JV1, respectively. All intercompany accounts and transactions have been eliminated in consolidation. The accompanying unaudited financial statements reflect all adjustments that are, in the opinion of management, of a normal and recurring nature and necessary for a fair statement of the Fund’s financial position as of September 30, 2014, and the results of its operations and cash flows for the periods presented. The results of operations for the three and nine month periods ended September 30, 2014 are not necessarily indicative of results of the Fund’s operations for the entire fiscal year. The financial statements have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) for interim financial reporting. Accordingly, certain information and note disclosures normally included in annual financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) have been condensed or omitted pursuant to those rules and regulations. These interim financial statements should be read in conjunction with the Fund’s financial statements and notes thereto presented in the Fund’s Annual Report on Form 10-K for the year ended December 31, 2013, as filed with the SEC on May 16, 2014.
Use of Estimates	Use of Estimates Preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates include the allowance for credit losses and the estimated unguaranteed residual values of leased equipment, among others. The Fund bases its estimates on historical experience and on various other assumptions that it believes are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates.
Investments in Commercial Finance Assets	Investments in Commercial Finance Assets The Fund’s investments in commercial finance assets consist of direct financing leases, operating leases, and loans. Direct Financing Leases. Certain of the Fund’s lease transactions are accounted for as direct financing leases (as distinguished from operating leases). Such leases transfer substantially all benefits and risks of equipment ownership to the customer. The Fund’s investment in direct financing leases consists of the sum of the total future minimum lease payments receivable and the estimated unguaranteed residual value of leased equipment, less unearned finance income. Unearned finance income, which is recognized as revenue over the term of the financing by the effective interest method, represents the excess of the total future minimum contracted payments plus the estimated unguaranteed residual value expected to be realized at the end of the lease term over the cost of the related equipment. Unguaranteed residual value represents the estimated amount to be received at lease termination from lease extensions or ultimate disposition of the leased equipment. The estimates of residual values are based upon the General Partner’s history with regard to the realization of residuals, available industry data and the General Partner’s senior management’s experience with respect to comparable equipment. The estimated residual values are recorded as a component of investments in leases. Residual values are reviewed periodically to determine if the current estimate of the equipment’s fair market value appears to be below its recorded estimate. If required, residual values are adjusted downward to reflect adjusted estimates of fair market values. Upward adjustments to residual values are not permitted. Operating Leases. Leases not meeting the criteria to be classified as direct financing leases are deemed to be operating leases. Under the accounting for operating leases, the cost of the leased equipment, including acquisition fees associated with lease placements, is recorded as an asset and depreciated on a straight-line basis over the equipment’s estimated useful life, generally up to seven years. Rental income consists primarily of monthly periodic rental payments due under the terms of the leases. The Fund recognizes rental income on a straight line basis. Generally, during the lease terms of existing operating leases, the Fund will not recover all of the cost and related expenses of its rental equipment and, therefore, it is prepared to remarket the equipment in future years. The Fund’s policy is to review, on a quarterly basis, the expected economic life of its rental equipment in order to determine the recoverability of its undepreciated cost. The Fund writes down its rental equipment to its estimated net realizable value when it is probable that its carrying amount exceeds such value and the excess can be reasonably estimated; gains are only recognized upon actual sale of the rental equipment. Loans. For term loans, the investment in loans consists of the sum of the total future minimum loan payments receivable less unearned finance income. Unearned finance income, which is recognized as revenue over the term of the financing by the effective interest method, represents the excess of the total future minimum contracted loan payments over the cost of the loan. For all other loans, interest income is recorded at the stated rate on the accrual basis to the extent that such amounts are expected to be collected. Allowance for Credit Losses. The Fund evaluates the adequacy of the allowance for credit losses (including investments in leases and loans) based upon, among other factors, management’s historical experience on the portfolios it manages, an analysis of contractual delinquencies, economic conditions and trends and equipment finance portfolio characteristics, adjusted for expected recoveries. In evaluating historic performance of the Fund’s leases and loans, the Fund performs a migration analysis, which estimates the likelihood that an account progresses through delinquency stages to ultimate charge-off unless individually reviewed for impairment. In an individual review for impairment the Fund considers the loans performance, probability of repayment, and general and local economic conditions when assessing whether impairment is necessary. Substantially all of the Fund’s leases and loans evaluated for impairment on an individual basis include an analysis of the market values of underlying collateral values, as adjusted for estimated selling and other closing costs. After an account becomes 180 or more days past due, any remaining balance is fully-reserved less an estimated recovery amount. Generally, past due accounts are referred to our internal recovery group consisting of a team of credit specialists and collectors. The group utilizes several resources in an attempt to maximize recoveries on charged-off accounts including: 1) initiating litigation against the end user customer and any personal guarantor, 2) referring the account to an outside law firm or collection agency and/or 3) repossessing and remarketing the equipment or other assets through third parties. The Fund’s policy is to charge off to the allowance those financings which are in default and for which it is probable management will be unable to collect all amounts contractually owed. The Fund discontinues the recognition of revenue for leases and loans for which payments are more than 90 days past due. Payments received while leases and loans are on non-accrual status are recorded as a reduction of principal. Generally income recognition resumes when a lease or loan becomes less than 90 days delinquent, unless certain factors specific to those leases or loans continue to raise concerns as to future collectability.
Other Income	Other Income Other income includes miscellaneous fees charged by the Fund such as late fee income, among others. The Fund recognizes late fee income as fees are collected. Late fee income was $14,000 and $156,000, respectively, for the three and nine month periods ended September 30, 2014, and was $114,000 and $332,000, respectively, for the three and nine month periods ending September 30, 2013.

Disclosure of accounting policy for finance, loan and lease receivables, including those held for investment and those held for sale. This disclosure may include (1) the basis at which such receivables are carried in the entity's statements of financial position (2) how the level of the allowance for loan and lease losses is determined (3) when impairments, charge-offs or recoveries are recognized for such receivables (4) the treatment of origination fees and costs, including the amortization method for net deferred fees or costs (5) the treatment of any premiums or discounts or unearned income (6) the entity's income recognition (revenues, expenses and gains and losses arising from committing to issue, issuing, granting, collecting, terminating, modifying and holding loans) policies for such receivables, including those that are impaired, past due or placed on nonaccrual status and (7) the treatment of foreclosures or repossessions.

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LEAF Equipment Finance Fund 4, L.P. 10-Q