Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document And Entity Information. Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Statement Of Financial Position [Abstract] Statement of Financial Position [Abstract] Statement, Scenario [Axis] Statement, Scenario [Axis] Series One [Member] Series One Member Series Two [Member] Series Two Member Series Three [Member] Series Three Member Series Four [Member] Series Four Member Series Five [Member] Series Five Member Series Six [Member] Series Six Member Assets [Abstract] ASSETS Cash and Cash Equivalents, At Carrying Value Cash and cash equivalents Cash and cash equivalents, beginning Cash and cash equivalents Cash and cash equivalents, beginning Cash and cash equivalents, ending Assets Assets Assets Liabilities [Abstract] LIABILITIES Due To Affiliate Accounts payable affiliates (note C) Accounts payable affiliates (note C) Partners Capital [Abstract] PARTNERS' CAPITAL (DEFICIT) Limited Partnership Interest Limited partnership interest Limited partnership interest General Partners Capital Account General Partner General Partner Partners Capital Partners Capital Partners Capital Partners' capital (deficit) Partners' capital (deficit) Liabilities and Stockholders Equity Liabilities and Stockholders' Equity Liabilities and Stockholders' Equity Condensed Balance Sheets Parenthetical [Abstract] Condensed Balance Sheets Parenthetical [Abstract] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Partners Capital Account, Distribution Per Unit Of Limited Partner Interest Beneficial assignee certificate, par value (in dollars per share) Limited Partners Capital Account, Units Authorized Units of limited partnership interest, authorized Limited Partners Capital Account, Units Issued Units of limited partnership interest, issued Limited Partners Capital Account, Units Outstanding Units of limited partnership interest, outstanding Income Statement [Abstract] Income Statement [Abstract] Revenues [Abstract] Income Revenues Interest Income, Operating Interest income Other Income Miscellaneous income Miscellaneous income Revenues Revenues Revenues Operating Expenses [Abstract] Expenses Professional Fees Professional fees Fund Management Fee Partnership management fees, net (Note C) Annual fund management fee charged on all apartment complexes owned by the Operating Partnerships net of reporting fees. General and Administrative Expense General and administrative expenses General and administrative fees Total Expenses Operating Expenses Operating expenses Total Amount of expenses incurred during the year by the entity. Net Income (Loss) Attributable To Parent Net loss NET INCOME (LOSS) NET LOSS Net loss Net Income (Loss) Allocated To Limited Partners Net loss allocated to assignees Net income (loss) allocated to assignees Net Income (Loss) Allocated To General Partners Net loss allocated to general partner Net income (loss) allocated to general partner Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic Net loss per BAC Net income (loss) per BAC Statement Of Partners Capital [Abstract] Statement of Partners' Capital [Abstract] Related Party Transactions, By Related Party [Axis] Related Party Transactions, by Related Party [Axis] Assignees [Member] General Partner [Member] Statement Of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Net Cash Provided By (Used In) Operating Activities [Abstract] Cash flows from operating activities: Adjustments To Reconcile Net Income (Loss) To Cash Provided By (Used In) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities Increase (Decrease) In Operating Capital [Abstract] Changes in assets and liabilities Increase (Decrease) In Accounts Payable Increase in accounts payable Increase (Decrease) In Due To Affiliates, Current Increase in accounts payable affiliates Increase in accounts payable affiliates Net Cash Provided By (Used In) Operating Activities Net cash (used in) provided by operating activities Net cash used in operating activities Net Cash Provided By (Used In) Investing Activities [Abstract] Cash flows from investing activities: Proceeds From Sale Of Equity Method Investments Partnership Proceeds from Disposition Partnership Proceeds from Disposition Proceeds from disposition of operatinglimited partnerships Cash and Cash Equivalents, Period Increase (Decrease) INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS DECREASE IN CASH AND CASH EQUIVALENTS Organization, Consolidation and Presentation Of Financial Statements [Abstract] ORGANIZATION [Abstract] Organization, Consolidation and Presentation Of Financial Statements Disclosure [Text Block] Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Accounting Policies [Abstract] Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Significant Accounting Policies [Text Block] Related Party Transactions [Abstract] Related Party Transactions Disclosure [Abstract] Related Party Transactions Disclosure [Text Block] Related Party Transactions Disclosure [Text Block] Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments [Abstract] Equity Method Investments and Joint Ventures Disclosure [Text Block] Equity Method Investments and Joint Ventures Disclosure [Text Block] Taxable Loss [Abstract] Taxable Loss [Abstract] Taxable Loss [Text Block] Taxable Loss [Text Block] This item represents the expected change in the Partnership's taxable loss for financial reporting purposes. This is primarily due to accounting differences in depreciation incurred by the Operating Partnerships and also differences between the equity method of accounting and IRS accounting methods. Income Tax Disclosure [Abstract] Income Tax [Abstract] Income Tax Relating To Partnership Disclosure [Text Block] Income Tax Relating To Partnership Disclosure [Text Block] Description containing the income tax disclosure relating to Partnership that has elected to be treated as a pass-through entity for income tax purposes and, as such, is not subject to income taxes. Plan Of Liquidation [Abstract] Plan Of Liquidation [Abstract] Liquidation Of Partnership Description [Text Block] Liquidation Of Partnership Description [Text Block] This item represents the plan of liquidation and dissolution of the partnership business. It includes all the activities in connection with the dissolution, winding up and liquidation of the Partnership, the termination of the responsibilities and liabilities of the Partnership under applicable law, and the termination of the existence of the Partnership. Schedule Of Gross Management Fee Table [Text Block] Schedule Of Gross Management Fee [Table Text Block] Schedule Of Gross Management Fee [Table Text Block] Tabular disclosure for gross management fee. Schedule Of Management Fees Paid Table [Text Block] Schedule Of Management Fees Paid [Table Text Block] Schedule Of Management Fees Paid [Table Text Block] Tabular disclosure for management fees paid. Schedule Of Number Of Operating Partnerships Table [Text Block] Schedule Of Number Of Operating Partnerships [Table Text Block] Schedule Of Number Of Operating Partnerships [Table Text Block] Tabular disclosure for number of operating partnerships. Schedule Of Summarized Statement Of Operations In Operating Partnerships Table [Text Block] Schedule Of Summarized Statement Of Operations In Operating Partnerships [Table Text Block] Schedule Of Summarized Statement Of Operations In Operating Partnerships [Table Text Block] Tabular disclosure for summarized statement of operations in operating partnerships. Gross Management Fee Gross Management Fee Gross amount of management fee during the period. Management Fees Paid Management Fees Paid Amount of management fees paid during the period. Percentage Of Annual Management Fee Percentage Of Annual Management Fee The percentage of annual management fee. Number Of Operating Partnerships Number Of Operating Partnerships Number of operating partnerships. Operating Partnership Interest Transferred Operating Partnership Interest Transferred The number of operating partnership interest transferred. Sale Of Underlying Operating Partnership Sale of Underlying Operating Partnership The number of sale of underlying operating partnership. Operating Partnerships Rental Income Rental The amount of rental income by an operating partnerships of the entity. Operating Partnerships Interest and Other Income Interest and other The amount of interest and other income by an operating partnerships of the entity. Operating Partnerships Revenues Operating Partnerships Revenues Operating Partnerships Revenues The amount of revenues by an operating partnerships of the entity. Expenses [Abstract] Expenses Operating Partnerships Interest Expenses Interest The amount of interest expenses by an operating partnerships of the entity. Operating Partnerships Depreciation and Amortization Depreciation and amortization The amount of depreciation and amortization by an operating partnerships of the entity. Operating Partnerships Operating Expenses Operating expenses The amount of operating expenses by an operating partnerships of the entity. Operating Partnerships Total Expenses Operating Partnerships Total Expenses Operating Partnerships Total Expenses The amount of total expenses by an operating partnerships of the entity. Operating Partnerships Net Loss NET LOSS NET LOSS The amount of net loss by an operating partnerships of the entity. Operating Partnerships Net Loss Allocated To Parent Net loss allocated to Boston Capital Tax Credit Fund Limited Partnership * The amount of net loss allocated to parent by an operating partnerships of the entity. Operating Partnerships Net Loss Allocated To Other Partners Net loss allocated to other Partners The amount of net loss allocated to other partners by an operating partnerships of the entity. Income Loss Not Recognized Under Equity Method Accounting Income Loss Not Recognized Under Equity Method Accounting Amount of income loss not recognized under equity method accounting. Other Assets Other assets Accounts Payable Accounts payable Income (Loss) From Equity Method Investments Gain/(Loss) on Disposition Share of income from Operating Partnerships(Note D) Share of income from Operating Partnerships(Note D) Share of Income from Operating Partnerships Related Party [Domain] Related Party [Domain] Partners Capital Account, Contributions Contribution Partners Capital Account, Distributions Distribution Net Cash Provided By (Used In) Investing Activities Net cash provided by investing activities Net cash provided by investing activities Net Cash Provided By (Used In) Financing Activities [Abstract] Cash flows from financing activities: Payments Of Distributions Distributions Cash outflow from payments of distributions to general and limited partners. Distributions Distributions Net Cash Provided By (Used In) Financing Activities Net cash used in financing activities Net cash used in financing activities Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Significant noncash investing and financing activities: Debt Conversion, Converted Instrument, Amount The general partner's equity balance was increased and accounts payable affiliates were reduced as a result of forgiveness of debt with an affiliate of the general partner. Schedule Of Dispositions By Series [Table Text Block] Tabular disclosure for dispositions by series. Subsequent Events [Abstract] Subsequent Events [Text Block] Estimated Cash Proceeds To Operating Partnership Amount of estimated cash proceeds to operating partnership. Estimated Gain On Sale Of Operating Partnerships Estimated gain on the sale of the Operating Partnerships.