<?xml version="1.0" encoding="UTF-8"?>
<edgarSubmission xmlns="http://www.sec.gov/edgar/nmfp" xmlns:com="http://www.sec.gov/edgar/common" xmlns:invest="http://www.sec.gov/edgar/invest" xmlns:part1="http://www.sec.gov/edgar/nmfpfund" xmlns:part2="http://www.sec.gov/edgar/nmfpsecurities" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sec.gov/edgar/nmfp eis_NMFP_Submission.xsd">
  <submissionType>N-MFP</submissionType>
  <liveTestFlag>LIVE</liveTestFlag>


  <isThisElectronicCopyOfPaperFormat>N</isThisElectronicCopyOfPaperFormat>
  <DocumentPeriodEndDate>2014-06-30</DocumentPeriodEndDate>
  <EntityCentralIndexKey>1186235</EntityCentralIndexKey>

  <seriesId>S000002960</seriesId>
  <totalClassesInSeries>4</totalClassesInSeries>
  <isThisFinalFiling>N</isThisFinalFiling>
  <isFundLiquidating>N</isFundLiquidating>
  <isFundMergingWithOrBeingAcquiredByAnotherFund>N</isFundMergingWithOrBeingAcquiredByAnotherFund>
  <hasFundAcquiredOrMergedWithAnotherFundSinceLastFiling>N</hasFundAcquiredOrMergedWithAnotherFundSinceLastFiling>
  <seriesLevelInformation>
    <part1:ContainedFileInformationFileNumber>333-99391</part1:ContainedFileInformationFileNumber>
    <part1:investmentAdviserList>
      <part1:adviser>
        <part1:adviserName>BlackRock Advisors, LLC</part1:adviserName>
        <part1:adviserFileNumber>801-47710</part1:adviserFileNumber>
      </part1:adviser>
    </part1:investmentAdviserList>
    <part1:independentPublicAccountant>
      <part1:name>DELOITTE &amp; TOUCHE LLP</part1:name>
      <part1:city>Boston</part1:city>
      <part1:state>MA</part1:state>
    </part1:independentPublicAccountant>
    <part1:administratorList>
      <part1:administrator>State Street </part1:administrator>
    </part1:administratorList>
    <part1:transferAgentList>
      <part1:transferAgent>
        <part1:name>FINANCIAL DATA SERVICES, INC.</part1:name>
        <part1:EntityCentralIndexKey>0000774455</part1:EntityCentralIndexKey>
        <part1:fileNumber>84-01339</part1:fileNumber>
      </part1:transferAgent>
    </part1:transferAgentList>
    <part1:isThisFeederFund>Y</part1:isThisFeederFund>
    <part1:masterFund>
      <part1:EntityCentralIndexKey>0001186243</part1:EntityCentralIndexKey>
      <part1:EntityRegistrantName>Master Tax-Exempt LLC</part1:EntityRegistrantName>
      <part1:seriesIdentifier>S000002958</part1:seriesIdentifier>
    </part1:masterFund>
    <part1:isThisMasterFund>N</part1:isThisMasterFund>
    <part1:isThisSeriesPrimarilyUsedToFundInsuranceCompanySeperateAccounts>N</part1:isThisSeriesPrimarilyUsedToFundInsuranceCompanySeperateAccounts>
    <part1:InvestmentTypeDomain>Other Tax Exempt Fund</part1:InvestmentTypeDomain>
    <part1:dollarWeightedAveragePortfolioMaturity>1</part1:dollarWeightedAveragePortfolioMaturity>
    <part1:dollarWeightedAverageLifeMaturity>1</part1:dollarWeightedAverageLifeMaturity>
    <part1:AvailableForSaleSecuritiesAmortizedCost>406921504.61</part1:AvailableForSaleSecuritiesAmortizedCost>
    <part1:OtherAssets>628197.81</part1:OtherAssets>
    <part1:Liabilities>612953.77</part1:Liabilities>
    <part1:AssetsNet>406936748.65</part1:AssetsNet>
    <part1:MoneyMarketSevenDayYield>0.0012</part1:MoneyMarketSevenDayYield>
    <part1:seriesShadowPrice>
      <part1:netValuePerShareIncludingCapitalSupportAgreement>1.0003</part1:netValuePerShareIncludingCapitalSupportAgreement>
      <part1:dateCalculatedFornetValuePerShareIncludingCapitalSupportAgreement>2014-06-30</part1:dateCalculatedFornetValuePerShareIncludingCapitalSupportAgreement>
      <part1:netValuePerShareExcludingCapitalSupportAgreement>1.0003</part1:netValuePerShareExcludingCapitalSupportAgreement>
      <part1:dateCalculatedFornetValuePerShareExcludingCapitalSupportAgreement>2014-06-30</part1:dateCalculatedFornetValuePerShareExcludingCapitalSupportAgreement>
    </part1:seriesShadowPrice>
  </seriesLevelInformation>
  <classLevelInformationList>
    <part1:classLevelInformation>
      <part1:classId>C000008096</part1:classId>
      <part1:minInitialInvestment>1.00</part1:minInitialInvestment>
      <part1:netAssetsOfClass>26314354.62</part1:netAssetsOfClass>
      <part1:netAssetValuePerShare>1.00</part1:netAssetValuePerShare>
      <part1:netShareholderFlowActivityForMonthEnded>7165425.00</part1:netShareholderFlowActivityForMonthEnded>
      <part1:grossSubscriptionsForMonthEnded>25208714.00</part1:grossSubscriptionsForMonthEnded>
      <part1:grossRedemptionsForMonthEnded>18043289.00</part1:grossRedemptionsForMonthEnded>
      <part1:sevenDayNetYield>0.0000</part1:sevenDayNetYield>
      <part1:classShadowPrice>
        <part1:netAssetValuePerShareIncludingCapitalSupportAgreement>
          <part1:value>1.0003</part1:value>
          <part1:dateAsOfWhichValueWasCalculated>2014-06-30</part1:dateAsOfWhichValueWasCalculated>
        </part1:netAssetValuePerShareIncludingCapitalSupportAgreement>
        <part1:netAssetValuePerShareExcludingCapitalSupportAgreement>
          <part1:value>1.0003</part1:value>
          <part1:dateAsOfWhichValueWasCalculated>2014-06-30</part1:dateAsOfWhichValueWasCalculated>
        </part1:netAssetValuePerShareExcludingCapitalSupportAgreement>
      </part1:classShadowPrice>
    </part1:classLevelInformation>
    <part1:classLevelInformation>
      <part1:classId>C000008097</part1:classId>
      <part1:minInitialInvestment>1.00</part1:minInitialInvestment>
      <part1:netAssetsOfClass>37129709.47</part1:netAssetsOfClass>
      <part1:netAssetValuePerShare>1.00</part1:netAssetValuePerShare>
      <part1:netShareholderFlowActivityForMonthEnded>3866767.00</part1:netShareholderFlowActivityForMonthEnded>
      <part1:grossSubscriptionsForMonthEnded>18632085.01</part1:grossSubscriptionsForMonthEnded>
      <part1:grossRedemptionsForMonthEnded>14765318.01</part1:grossRedemptionsForMonthEnded>
      <part1:sevenDayNetYield>0.0000</part1:sevenDayNetYield>
      <part1:classShadowPrice>
        <part1:netAssetValuePerShareIncludingCapitalSupportAgreement>
          <part1:value>1.0003</part1:value>
          <part1:dateAsOfWhichValueWasCalculated>2014-06-30</part1:dateAsOfWhichValueWasCalculated>
        </part1:netAssetValuePerShareIncludingCapitalSupportAgreement>
        <part1:netAssetValuePerShareExcludingCapitalSupportAgreement>
          <part1:value>1.0003</part1:value>
          <part1:dateAsOfWhichValueWasCalculated>2014-06-30</part1:dateAsOfWhichValueWasCalculated>
        </part1:netAssetValuePerShareExcludingCapitalSupportAgreement>
      </part1:classShadowPrice>
    </part1:classLevelInformation>
    <part1:classLevelInformation>
      <part1:classId>C000008098</part1:classId>
      <part1:minInitialInvestment>1.00</part1:minInitialInvestment>
      <part1:netAssetsOfClass>116614624.04</part1:netAssetsOfClass>
      <part1:netAssetValuePerShare>1.00</part1:netAssetValuePerShare>
      <part1:netShareholderFlowActivityForMonthEnded>-3118518.00</part1:netShareholderFlowActivityForMonthEnded>
      <part1:grossSubscriptionsForMonthEnded>36506487.56</part1:grossSubscriptionsForMonthEnded>
      <part1:grossRedemptionsForMonthEnded>39625005.56</part1:grossRedemptionsForMonthEnded>
      <part1:sevenDayNetYield>0.0000</part1:sevenDayNetYield>
      <part1:classShadowPrice>
        <part1:netAssetValuePerShareIncludingCapitalSupportAgreement>
          <part1:value>1.0003</part1:value>
          <part1:dateAsOfWhichValueWasCalculated>2014-06-30</part1:dateAsOfWhichValueWasCalculated>
        </part1:netAssetValuePerShareIncludingCapitalSupportAgreement>
        <part1:netAssetValuePerShareExcludingCapitalSupportAgreement>
          <part1:value>1.0003</part1:value>
          <part1:dateAsOfWhichValueWasCalculated>2014-06-30</part1:dateAsOfWhichValueWasCalculated>
        </part1:netAssetValuePerShareExcludingCapitalSupportAgreement>
      </part1:classShadowPrice>
    </part1:classLevelInformation>
    <part1:classLevelInformation>
      <part1:classId>C000008099</part1:classId>
      <part1:minInitialInvestment>1.00</part1:minInitialInvestment>
      <part1:netAssetsOfClass>226878060.52</part1:netAssetsOfClass>
      <part1:netAssetValuePerShare>1.00</part1:netAssetValuePerShare>
      <part1:netShareholderFlowActivityForMonthEnded>83113094.02</part1:netShareholderFlowActivityForMonthEnded>
      <part1:grossSubscriptionsForMonthEnded>174011733.17</part1:grossSubscriptionsForMonthEnded>
      <part1:grossRedemptionsForMonthEnded>90898639.15</part1:grossRedemptionsForMonthEnded>
      <part1:sevenDayNetYield>0.0000</part1:sevenDayNetYield>
      <part1:classShadowPrice>
        <part1:netAssetValuePerShareIncludingCapitalSupportAgreement>
          <part1:value>1.0003</part1:value>
          <part1:dateAsOfWhichValueWasCalculated>2014-06-30</part1:dateAsOfWhichValueWasCalculated>
        </part1:netAssetValuePerShareIncludingCapitalSupportAgreement>
        <part1:netAssetValuePerShareExcludingCapitalSupportAgreement>
          <part1:value>1.0003</part1:value>
          <part1:dateAsOfWhichValueWasCalculated>2014-06-30</part1:dateAsOfWhichValueWasCalculated>
        </part1:netAssetValuePerShareExcludingCapitalSupportAgreement>
      </part1:classShadowPrice>
    </part1:classLevelInformation>
  </classLevelInformationList>
  <scheduleOfPortfolioSecuritiesList>
    <part2:scheduleOfPortfolioSecurities>
      <part2:InvestmentIssuer>Master Tax-Exempt LLC</part2:InvestmentIssuer>
      <part2:InvestmentTitle>Master Tax-Exempt LLC</part2:InvestmentTitle>
      <part2:InvestmentIdentifier>BLKRK89N6</part2:InvestmentIdentifier>
      <part2:EntityCentralIndexKey>0001186243</part2:EntityCentralIndexKey>
      <part2:InvestmentTypeDomain>Investment Company</part2:InvestmentTypeDomain>
      <part2:isFundTreatingAsAcquisitionUnderlyingSecurities>N</part2:isFundTreatingAsAcquisitionUnderlyingSecurities>
      <part2:rating>First Tier Security</part2:rating>
      <part2:designatedNRSROList>
        <part2:designatedNRSRO>
          <part2:RAN>N/A</part2:RAN>
          <part2:R>N/A</part2:R>
        </part2:designatedNRSRO>
      </part2:designatedNRSROList>
      <part2:InvestmentMaturityDate>2014-07-01</part2:InvestmentMaturityDate>
      <part2:finalLegalInvestmentMaturityDate>2014-07-01</part2:finalLegalInvestmentMaturityDate>
      <part2:doesSecurityHaveDemandFeature>N</part2:doesSecurityHaveDemandFeature>
      <part2:doesSecurityHaveGuarantee>N</part2:doesSecurityHaveGuarantee>
      <part2:doesSecurityHaveEnhancementsOnWhichFundRelying>N</part2:doesSecurityHaveEnhancementsOnWhichFundRelying>
      <part2:InvestmentOwnedBalancePrincipalAmount>406921504.61</part2:InvestmentOwnedBalancePrincipalAmount>
      <part2:AvailableForSaleSecuritiesAmortizedCost>406921504.61</part2:AvailableForSaleSecuritiesAmortizedCost>
      <part2:InvestmentOwnedPercentOfNetAssets>1.0000</part2:InvestmentOwnedPercentOfNetAssets>
      <part2:isThisIlliquidSecurity>N</part2:isThisIlliquidSecurity>
      <part2:InvestmentOwnedAtFairValue>406921504.61</part2:InvestmentOwnedAtFairValue>
      <part2:valueOfSecurityExcludingValueOfCapitalSupportAgreement>406921504.61</part2:valueOfSecurityExcludingValueOfCapitalSupportAgreement>
    </part2:scheduleOfPortfolioSecurities>
  </scheduleOfPortfolioSecuritiesList>
</edgarSubmission>
