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<Return returnVersion="2025v4.0" xmlns="http://www.irs.gov/efile" xsi:schemaLocation="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2026-06-11T01:40:45-05:00</ReturnTs>
    <TaxPeriodEndDt>2025-12-31</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>814218126</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>MASS TAX CORP</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>70 JAMES STREET</AddressLine1Txt>
        <AddressLine2Txt>SUITE 129</AddressLine2Txt>
        <CityNm>WORCESTER</CityNm>
        <StateAbbreviationCd>MA</StateAbbreviationCd>
        <ZIPCd>01603</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990PF</ReturnTypeCd>
    <TaxPeriodBeginDt>2025-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>990800395</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>ESTAMOS UNIDOS INC</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>ESTA</BusinessNameControlTxt>
      <PhoneNum>5084998829</PhoneNum>
      <USAddress>
        <AddressLine1Txt>70 JAMES ST SUITE 129</AddressLine1Txt>
        <CityNm>WORCESTER</CityNm>
        <StateAbbreviationCd>MA</StateAbbreviationCd>
        <ZIPCd>01603</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>KARYN</PersonNm>
      <PersonTitleTxt>TREASURER</PersonTitleTxt>
      <PhoneNum>7742304630</PhoneNum>
      <SignatureDt>2026-06-11</SignatureDt>
      <DiscussWithPaidPreparerInd>1</DiscussWithPaidPreparerInd>
    </BusinessOfficerGrp>
    <PreparerPersonGrp>
      <PreparerPersonNm>KARYN R SANCHEZ</PreparerPersonNm>
      <PTIN>P01978983</PTIN>
      <PhoneNum>5084998829</PhoneNum>
    </PreparerPersonGrp>
    <TaxYr>2025</TaxYr>
    <BuildTS>2025-03-06 01:10:19Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="3">
    <IRS990PF documentId="IRS990PF" referenceDocumentId="ReasonableCauseExplanation GeneralExplanationAttachment">
      <InitialReturnInd>X</InitialReturnInd>
      <Organization501c3ExemptPFInd>X</Organization501c3ExemptPFInd>
      <FMVAssetsEOYAmt>0</FMVAssetsEOYAmt>
      <MethodOfAccountingCashInd>X</MethodOfAccountingCashInd>
      <AnalysisOfRevenueAndExpenses>
        <NetRentalIncomeOrLossAmt>0</NetRentalIncomeOrLossAmt>
        <TotalRevAndExpnssAmt>0</TotalRevAndExpnssAmt>
        <TotalNetInvstIncmAmt>0</TotalNetInvstIncmAmt>
        <TotOprExpensesRevAndExpnssAmt>0</TotOprExpensesRevAndExpnssAmt>
        <TotOprExpensesNetInvstIncmAmt>0</TotOprExpensesNetInvstIncmAmt>
        <TotOprExpensesDsbrsChrtblAmt>0</TotOprExpensesDsbrsChrtblAmt>
        <ContriPaidRevAndExpnssAmt>0</ContriPaidRevAndExpnssAmt>
        <ContriPaidDsbrsChrtblAmt>0</ContriPaidDsbrsChrtblAmt>
        <TotalExpensesRevAndExpnssAmt>0</TotalExpensesRevAndExpnssAmt>
        <TotalExpensesNetInvstIncmAmt>0</TotalExpensesNetInvstIncmAmt>
        <TotalExpensesDsbrsChrtblAmt>0</TotalExpensesDsbrsChrtblAmt>
        <ExcessRevenueOverExpensesAmt>0</ExcessRevenueOverExpensesAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
      </AnalysisOfRevenueAndExpenses>
      <Form990PFBalanceSheetsGrp>
        <TotalAssetsEOYAmt>0</TotalAssetsEOYAmt>
        <TotalAssetsEOYFMVAmt>0</TotalAssetsEOYFMVAmt>
        <TotalLiabilitiesEOYAmt>0</TotalLiabilitiesEOYAmt>
        <TotNetAstOrFundBalancesEOYAmt>0</TotNetAstOrFundBalancesEOYAmt>
        <TotalLiabilitiesNetAstBOYAmt>0</TotalLiabilitiesNetAstBOYAmt>
        <TotalLiabilitiesNetAstEOYAmt>0</TotalLiabilitiesNetAstEOYAmt>
      </Form990PFBalanceSheetsGrp>
      <ExciseTaxBasedOnInvstIncmGrp>
        <InvestmentIncomeExciseTaxAmt>0</InvestmentIncomeExciseTaxAmt>
      </ExciseTaxBasedOnInvstIncmGrp>
      <StatementsRegardingActyGrp>
        <NewSubstantialContributorsInd>0</NewSubstantialContributorsInd>
        <OwnControlledEntityInd>0</OwnControlledEntityInd>
        <ComplyWithPublicInspRqrInd>0</ComplyWithPublicInspRqrInd>
        <WebsiteAddressTxt>0</WebsiteAddressTxt>
        <PersonsWithBooksName>
          <BusinessNameLine1Txt>KARYN SANCHEZ</BusinessNameLine1Txt>
        </PersonsWithBooksName>
        <PhoneNum>5084998829</PhoneNum>
        <LocationOfBooksUSAddress>
          <AddressLine1Txt>70 JAMES ST</AddressLine1Txt>
          <AddressLine2Txt>SUITE 129</AddressLine2Txt>
          <CityNm>WORCESTER</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>01603</ZIPCd>
        </LocationOfBooksUSAddress>
      </StatementsRegardingActyGrp>
      <StatementsRegardingActy4720Grp />
      <OfficerDirTrstKeyEmplInfoGrp>
        <OfficerDirTrstKeyEmplGrp>
          <BusinessName>
            <BusinessNameLine1Txt>ALBERTO SAGASTUME</BusinessNameLine1Txt>
          </BusinessName>
          <USAddress>
            <AddressLine1Txt>70 JAMES ST SUITE 129</AddressLine1Txt>
            <CityNm>WORCESTER</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>01603</ZIPCd>
          </USAddress>
          <TitleTxt>PRESIDENT AND CLERK</TitleTxt>
          <AverageHrsPerWkDevotedToPosRt>5</AverageHrsPerWkDevotedToPosRt>
          <CompensationAmt>0</CompensationAmt>
        </OfficerDirTrstKeyEmplGrp>
        <OfficerDirTrstKeyEmplGrp>
          <BusinessName>
            <BusinessNameLine1Txt>KARYN SANCHEZ</BusinessNameLine1Txt>
          </BusinessName>
          <USAddress>
            <AddressLine1Txt>70 JAMES ST SUITE 129</AddressLine1Txt>
            <CityNm>WORCESTER</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>01603</ZIPCd>
          </USAddress>
          <TitleTxt>TREASURER AND DIRECT</TitleTxt>
          <AverageHrsPerWkDevotedToPosRt>5</AverageHrsPerWkDevotedToPosRt>
          <CompensationAmt>0</CompensationAmt>
        </OfficerDirTrstKeyEmplGrp>
        <CompOfHghstPdEmplOrNONETxt>NONE</CompOfHghstPdEmplOrNONETxt>
        <CompOfHghstPdCntrctOrNONETxt>NONE</CompOfHghstPdCntrctOrNONETxt>
      </OfficerDirTrstKeyEmplInfoGrp>
      <SummaryOfDirectChrtblActyGrp />
      <SumOfProgramRelatedInvstGrp />
      <MinimumInvestmentReturnGrp>
        <AverageMonthlyFMVOfSecAmt>0</AverageMonthlyFMVOfSecAmt>
        <AverageMonthlyCashBalancesAmt>0</AverageMonthlyCashBalancesAmt>
        <FMVAllOtherNoncharitableAstAmt>0</FMVAllOtherNoncharitableAstAmt>
        <TotalFMVOfUnusedAssetsAmt>0</TotalFMVOfUnusedAssetsAmt>
        <AdjustedTotalFMVOfUnusedAstAmt>0</AdjustedTotalFMVOfUnusedAstAmt>
        <CashDeemedCharitableAmt>0</CashDeemedCharitableAmt>
        <NetVlNoncharitableAssetsAmt>0</NetVlNoncharitableAssetsAmt>
        <MinimumInvestmentReturnAmt>0</MinimumInvestmentReturnAmt>
      </MinimumInvestmentReturnGrp>
      <DistributableAmountGrp>
        <DistributableAsAdjustedAmt>0</DistributableAsAdjustedAmt>
      </DistributableAmountGrp>
      <PFQualifyingDistributionsGrp>
        <ExpensesAndContributionsAmt>0</ExpensesAndContributionsAmt>
      </PFQualifyingDistributionsGrp>
      <UndistributedIncomeGrp>
        <DistributableAsAdjustedAmt>0</DistributableAsAdjustedAmt>
        <UndistributedIncomeCYAmt>0</UndistributedIncomeCYAmt>
      </UndistributedIncomeGrp>
      <SupplementaryInformationGrp />
      <AnalysisIncomeProducingActyGrp />
    </IRS990PF>
    <GeneralExplanationAttachment documentId="GeneralExplanationAttachment">
      <GeneralExplanationGrp>
        <FormAndLineReferenceDesc>FORM 990PF PART VIII LINE 1</FormAndLineReferenceDesc>
        <MediumExplanationTxt>NO ACTIVITY THIS YEAR</MediumExplanationTxt>
      </GeneralExplanationGrp>
    </GeneralExplanationAttachment>
    <ReasonableCauseExplanation documentId="ReasonableCauseExplanation">
      <ExplanationTxt>NO ACTIVITY THIS YEAR</ExplanationTxt>
    </ReasonableCauseExplanation>
  </ReturnData>
</Return>